【Prototype 1.4.0】源碼解讀----全文註釋版
/* Prototype JavaScript framework, version 1.4.0
* (c) 2005 Sam Stephenson <[email protected]>
*
* Prototype is freely distributable under the terms of an MIT-style license.
* For details, see the Prototype web site: http://prototype.conio.net/
* 這是一個JavaScript的框架,致力於簡化動態的Web開發,完全按照面對對象的思想
* 進行Javascript開發,添加了迭代器的概念增強Javascript的設計能力。
* Prototype框架構思獨特充滿了技巧性的代碼,方便易用的工具類!
*
/*--------------------------------------------------------------------------*/
/* 【Prototype】定義一個全局對象,提供一個全局的基本信息和工具 */
var Prototype = {
Version: '1.4.0', //可以作爲版本檢測用
//用於腳本檢測的正則表達式,經常使用所以放在這裏起到全局常量的作用
ScriptFragment: '(?:<script.*?>)(( | |.)*?)(?:</script>)',
emptyFunction: function() {},//空函數
K: function(x) {return x}//K方法返回參數本身,在後面經常用到
}
/*========================================================================================*/
/*
*【Class】對象的作用只有一個就是提供了一個定義類的模式
* 僅含有create 一個方法,返回一個構造函數。
* 一般使用如下
* var X = Class.create(); 返回一個類型
* 要使用 X 類型,需繼續用 new X()來獲取一個實例 這與C# JAVA類似
* 返回的構造函數會執行名爲 initialize 的方法, initialize 是 Ruby 對象的構造器方法名字。
* 此時initialize方法還沒有定義,其後的代碼中創建新類型時會建立相應的同名方法,可以看作是一個抽象方法。
* 從C#角度講可以理解爲用Class.create()創建一個繼承Object基類的類。
*
*/
var Class = {
create: function() {
return function() { //下面使用Apply方法傳遞參數是一個常用的技巧
this.initialize.apply(this, arguments);
}
}
}
/*========================================================================================*/
//Abstract是一個空對象,它的作用僅僅是作爲一個抽象的命名空間,所有在該對象下定義的類都是抽象類
//從而從形式上與實體類分開
var Abstract = new Object();
/*
*Object是所有對象的基類,這個基類有兩個靜態方法
*/
//把Source的所有屬性和方法傳遞給Destination,實現了繼承的效果
Object.extend = function(destination, source) {
for (property in source) {
destination[property] = source[property];
}
return destination;
}
//觀察Object的組成,需要參數中的object實現自己的inspect方法
Object.inspect = function(object) {
try {
if (object == undefined) return 'undefined';
if (object == null) return 'null';
return object.inspect ? object.inspect() : object.toString();
} catch (e) {
if (e instanceof RangeError) return '';
throw e;
}
}
/*========================================================================================*/
//【Function】是所有函數對象的基類,可以通過對它的擴展實現對所有函數對象添加功能
/* 這裏在綁定的時候舊可以傳遞參數而不是調用的時候才指定參數,bind方法接收多個參數
將函數綁定到第一個參數指定的對象上,並返回該方法的調用句柄
*/
Function.prototype.bind = function() {
// $A()方法的作用是把參數專爲數組
//數組的shift方法作用是刪除數組的第一個元素
var __method = this, args = $A(arguments), object = args.shift();
return function() {
return __method.apply(object, args.concat($A(arguments)));
//這裏的$A(arguments)是條用返回函數句柄時傳遞的參數,不是bind方法的參數
}
}
/**
* 和bind一樣,不過這個方法一般用做html控件對象的事件處理。所以要傳遞event對象
* 好像是重載了_method方法
*/
Function.prototype.bindAsEventListener = function(object) {
var __method = this;
return function(event) {
return __method.call(object, event || window.event);
}
}
/*========================================================================================*/
//【Function】是所有數值類型的基類
Object.extend(Number.prototype, {
toColorPart: function() { //RGB-》16進制顏色
var digits = this.toString(16);
if (this < 16) return '0' + digits;
return digits;
},
succ: function() { //數值加一 var a=1; var b=a.succ; 那麼b=2
return this + 1;
},
times: function(iterator) {
//這裏的參數iterator是一個迭代器作用就是循環調用指定次數的iterator函數
//$R(start,end,exclusive)是創建ObjectRnge對象的快捷方式
$R(0, this, true).each(iterator);
return this;
}
});
/*========================================================================================*/
//提供了一個方法these,要求參數是函數的句柄,可以有多個。作用就是返回第一個成功執行的函數的返回值
var Try = {
these: function() {
var returnValue;
for (var i = 0; i < arguments.length; i++) {
var lambda = arguments[i];
try {
returnValue = lambda();
break;
} catch (e) {}
}
return returnValue;
}
}
/*========================================================================================*/
//定時器類用來實現Window.setInterval的效果,在給定時間間隔執行某一個函數,增加了對重複執行的控制S
var PeriodicalExecuter = Class.create();
PeriodicalExecuter.prototype = {
initialize: function(callback, frequency) {
//構造函數指定回調函數和執行頻率,單位是秒
this.callback = callback;
this.frequency = frequency;
this.currentlyExecuting = false;
this.registerCallback();
},
/* 開始調用定時器,無需顯示調用,在構造函數中就實現了自動調用,這一下面的
this.onTimerEvent.bind(this)如果寫成this.onTimerEvent則this指針就會指向widows對象即setInterval的默認對象
從而不能正確的引用到下面兩個函數上,也就失去了對正在執行函數的控制
*/
registerCallback: function() {
setInterval(this.onTimerEvent.bind(this), this.frequency * 1000);
},
//下面的函數相當於是回調函數的一個代理, setInterval是到了指定的時間就會強制執行而這裏
//加入了一個判斷如果callback函數執行的時間超過了一個時間片,則阻止其被重複執行
onTimerEvent: function() {
if (!this.currentlyExecuting) {
try {
this.currentlyExecuting = true;
this.callback();
} finally {
this.currentlyExecuting = false;
}
}
}
}
/*使用舉例:
function GetOnlineCount()
{//獲得在線人數
}
new PeriodicalExecuter(GetOnlineCount,10)每10秒獲取一次
*/
/*========================================================================================*/
/* 框架核心內容--------【基礎工具類】
/*========================================================================================*/
/*document.getElementById(id)獲取一個指定ID的結點,是這個方法的快捷方式和擴展
可以指定多個參數返回一個對象數組。參數也不一定是ID也可以是對象本身的引用,例如
$('id')等價於$($('id'))
*/
function $() {
var elements = new Array();
for (var i = 0; i < arguments.length; i++) {
var element = arguments[i];
if (typeof element == 'string')
element = document.getElementById(element);
if (arguments.length == 1)
return element;
elements.push(element);
}
return elements;
}
/*========================================================================================*/
//【String】類的擴展
//刪除字符串中的HTML標記
Object.extend(String.prototype, {
stripTags: function() {
return this.replace(/</?[^>]+>/gi, '');
},
//刪除字符串中的腳本塊
stripScripts: function() {
return this.replace(new RegExp(Prototype.ScriptFragment, 'img'), '');
},
//提取字符串中的所有腳本塊,作爲數組返回,每一個腳本作爲一個數組元素
extractScripts: function() {
var matchAll = new RegExp(Prototype.ScriptFragment, 'img');
var matchOne = new RegExp(Prototype.ScriptFragment, 'im');
return (this.match(matchAll) || []).map(function(scriptTag) {
return (scriptTag.match(matchOne) || ['', ''])[1];
});
},
//提取字符串中的腳本並執行
evalScripts: function() {
return this.extractScripts().map(eval);
},
//將字符串進行html編碼例如"<" --》"<"
escapeHTML: function() {
var div = document.createElement('div');
var text = document.createTextNode(this);
div.appendChild(text);
return div.innerHTML;
},
//對字符串進行html解碼例如"<"--》"<"
unescapeHTML: function() {
var div = document.createElement('div');
div.innerHTML = this.stripTags();
return div.childNodes[0] ? div.childNodes[0].nodeValue : '';
},
//將查詢字符串格式的字符串轉換爲鍵值對數組
//例如var s="a=1&b=2&c=3"; var s2=s.toQueryParams(); s2爲{a:1,b:2,c:3}
toQueryParams: function() {
var pairs = this.match(/^??(.*)$/)[1].split('&');
return pairs.inject({}, function(params, pairString) {
var pair = pairString.split('=');
params[pair[0]] = pair[1];
return params;
});
},
//字符串轉換爲字符數組 "abc"-->['a','b','c']
toArray: function() {
return this.split('');
},
//連字符--》駱駝樣式 'good-man'-->'goodMan'
camelize: function() {
var oStringList = this.split('-');
if (oStringList.length == 1) return oStringList[0];
var camelizedString = this.indexOf('-') == 0
? oStringList[0].charAt(0).toUpperCase() + oStringList[0].substring(1)
: oStringList[0];
for (var i = 1, len = oStringList.length; i < len; i++) {
var s = oStringList[i];
camelizedString += s.charAt(0).toUpperCase() + s.substring(1);
}
return camelizedString;
},
//得到字符串的組成結構
inspect: function() {
/*這個加註釋爲了讓下面的顯示好看點
return "'" + this.replace('', '/').replace("'", ''') + "'";
*/ }
});
//定義了一個等價的函數
String.prototype.parseQuery = String.prototype.toQueryParams;
/*========================================================================================*/
//【Enumerable】可枚舉接口 是整個1.4.0框架的核心工具,所有實現此接口的類必須要實現_each(iterator)方法
var $break = new Object(); //首先定義了兩個異常對象,用於進行迭代計算的控制
var $continue = new Object();
var Enumerable = {
//用於對對象的每一個元素遍歷執行iterator迭代器函數
each: function(iterator) {
var index = 0; //可選參數表示元素在枚舉對象的次序
try {
this._each(function(value) {//value是枚舉元素的值
try {
iterator(value, index++);
} catch (e) {
if (e != $continue) throw e;
}
});
} catch (e) {
if (e != $break) throw e;
}
},
//判斷是否所有的枚舉元素都能使iterator返回true
all: function(iterator) {
var result = true;
this.each(function(value, index) {
result = result && !!(iterator || Prototype.K)(value, index);
if (!result) throw $break;
});
return result;
},
//判斷是否有枚舉元素能使iterator返回true,有一個就是True
any: function(iterator) {
var result = true;
this.each(function(value, index) {
if (result = !!(iterator || Prototype.K)(value, index))
throw $break;
});
return result;
},
//對所有的枚舉元素執行iterator迭代器函數 結果作爲一個數組返回
collect: function(iterator) {
var results = [];
this.each(function(value, index) {
results.push(iterator(value, index));
});
return results;
},
//第一個素能使iterator返回true的枚舉元素的值,沒有返回undefined
detect: function (iterator) {
var result;
this.each(function(value, index) {
if (iterator(value, index)) {
result = value;
throw $break;
}
});
return result;
},
//找到所有的能使iterator迭代器函數返回true的枚舉元素 作爲一個數組返回
findAll: function(iterator) {
var results = [];
this.each(function(value, index) {
if (iterator(value, index))
results.push(value);
});
return results;
},
//找到素有匹配pattern的枚舉元素,結果作爲數組返回,iterator可選,如果不指定舊返回素有匹配pattern的枚舉元素
grep: function(pattern, iterator) {//正則模式 迭代器
var results = [];
this.each(function(value, index) {
var stringValue = value.toString();
if (stringValue.match(pattern))
results.push((iterator || Prototype.K)(value, index));
})
return results;
},
//判斷枚舉對象中是否含有參數Object指定的值
include: function(object) {
var found = false;
this.each(function(value) {
if (value == object) {
found = true;
throw $break;
}
});
return found;
},
//將memo作爲iterator的第一個參數,枚舉元素作爲iterator的第二個參數,枚舉元素的次序作爲第三個
//參數每次迭代器的返回值將作爲下一個iterator的memo參數,從而所有的迭代執行都通過memo聯繫起來了
inject: function(memo, iterator) {
this.each(function(value, index) {
memo = iterator(memo, value, index);
});
return memo;
},
//對所有的枚舉元素執行method方法 後面是要傳遞的參數
invoke: function(method) {
var args = $A(arguments).slice(1);
return this.collect(function(value) {
return value[method].apply(value, args);
});
},
//返回的最大的迭代器執行結果
max: function(iterator) {
var result;
this.each(function(value, index) {
value = (iterator || Prototype.K)(value, index);
if (value >= (result || value))
result = value;
});
return result;
},
//反之
min: function(iterator) {
var result;
this.each(function(value, index) {
value = (iterator || Prototype.K)(value, index);
if (value <= (result || value))
result = value;
});
return result;
},
//返回兩個數組一組能使iterator返回true 另一組返回false
partition: function(iterator) {
var trues = [], falses = [];
this.each(function(value, index) {
((iterator || Prototype.K)(value, index) ?
trues : falses).push(value);
});
return [trues, falses];
},
//獲取所有枚舉元素的property屬性值作爲數組的返回
pluck: function(property) {
var results = [];
this.each(function(value, index) {
results.push(value[property]);
});
return results;
},
//與findall相反
reject: function(iterator) {
var results = [];
this.each(function(value, index) {
if (!iterator(value, index))
results.push(value);
});
return results;
},
//根據iterator的結果排序 最小的在前面 作爲數組返回
sortBy: function(iterator) {
return this.collect(function(value, index) {
return {value: value, criteria: iterator(value, index)};
}).sort(function(left, right) {
var a = left.criteria, b = right.criteria;
return a < b ? -1 : a > b ? 1 : 0;
}).pluck('value');
},
//枚舉對象--》數組
toArray: function() {
return this.collect(Prototype.K);
},
//接收多個枚舉對象參數,最後一個可以是迭代器用於陣列轉換
zip: function() {
var iterator = Prototype.K, args = $A(arguments);
if (typeof args.last() == 'function')
iterator = args.pop();
var collections = [this].concat(args).map($A);
return this.map(function(value, index) {
iterator(value = collections.pluck(index));
return value;
});
},
//返回枚舉對象的字符串描述
inspect: function() {
return '#<Enumerable:' + this.toArray().inspect() + '>';
}
}
//等價函數定義
Object.extend(Enumerable, {
map: Enumerable.collect,
find: Enumerable.detect,
select: Enumerable.findAll,
member: Enumerable.include,
entries: Enumerable.toArray
});
/*========================================================================================*/
//【Array】數組對象
//參數轉換爲數組,如果參數定義了toarray則直接調用,否則枚舉獲得數組
var $A = Array.from = function(iterable) {
if (!iterable) return [];
if (iterable.toArray) {
return iterable.toArray();
} else {
var results = [];
for (var i = 0; i < iterable.length; i++)
results.push(iterable[i]);
return results;
}
}
//數組對象繼承了Enumerable接口
Object.extend(Array.prototype, Enumerable);
Array.prototype._reverse = Array.prototype.reverse;
Object.extend(Array.prototype, {
//實現了枚舉接口方法,用於對數組內的元素執行迭代器
_each: function(iterator) {
for (var i = 0; i < this.length; i++)
iterator(this[i]);
},
//清空數組
clear: function() {
this.length = 0;
return this;
},
//取得第一個元素
first: function() {
return this[0];
},
//取得最後一個元素
last: function() {
return this[this.length - 1];
},
//刪除數組元素中所有的null undefined值 作爲新數組返回,原數組不受影響
compact: function() {
return this.select(function(value) {
return value != undefined || value != null;
});
},
//展開所有數組元素不再嵌套
flatten: function() {
return this.inject([], function(array, value) {
return array.concat(value.constructor == Array ?
value.flatten() : [value]);
});
},
//數組中刪除指定的元素,返回刪除後的結果,原數組不受影響
without: function() {
var values = $A(arguments);
return this.select(function(value) {
return !values.include(value);
});
},
//Value元素在數組中的索引值
indexOf: function(object) {
for (var i = 0; i < this.length; i++)
if (this[i] == object) return i;
return -1;
},
//反轉數組
reverse: function(inline) {
return (inline !== false ? this : this.toArray())._reverse();
},
//刪除數組中第一個元素並返回這個元素的值
shift: function() {
var result = this[0];
for (var i = 0; i < this.length - 1; i++)
this[i] = this[i + 1];
this.length--;
return result;
},
//得到數組的字符串描述例如arr=[1,2,3]-----> "[1,2,3]"
inspect: function() {
return '[' + this.map(Object.inspect).join(', ') + ']';
}
});
/*========================================================================================*/
//【Hash】哈希對象
var Hash = {
//實現枚舉接口方法從而使Hash對象也是枚舉對象
_each: function(iterator) {
for (key in this) {
var value = this[key];
if (typeof value == 'function') continue;
var pair = [key, value];
pair.key = key;
pair.value = value;
iterator(pair);
}
},
//所有鍵數組
keys: function() {
return this.pluck('key');
},
//所有值數組
values: function() {
return this.pluck('value');
},
//合併哈希表,鍵相同就覆蓋調用者
merge: function(hash) {
return $H(hash).inject($H(this), function(mergedHash, pair) {
mergedHash[pair.key] = pair.value;
return mergedHash;
});
},
//鍵值對組成查詢字符串的形式
toQueryString: function() {
return this.map(function(pair) {
return pair.map(encodeURIComponent).join('=');
}).join('&');
},
//獲取Hash對象的字符串描述
inspect: function() {
return '#<Hash:{' + this.map(function(pair) {
return pair.map(Object.inspect).join(': ');
}).join(', ') + '}>';
}
}
/*哈希表不是類而是對象所以不能用new的方法創建,而是用$H()函數
這個方法吧一個對象轉換爲哈希對象,對象的屬性名爲key 值爲value
可枚舉!!
*/
function $H(object) {
var hash = Object.extend({}, object || {});
Object.extend(hash, Enumerable);
Object.extend(hash, Hash);
return hash;
}
/*========================================================================================*/
//【ObjectRange】用於進行指定次數的循環運算,同樣繼承於枚舉接口並實現_each方法
//有了這個方法基本上Javascript裏面就不用for循環了
ObjectRange = Class.create();
Object.extend(ObjectRange.prototype, Enumerable);
Object.extend(ObjectRange.prototype, {
//構造函數同事指定了3個參數的值
initialize: function(start, end, exclusive) {
this.start = start; //其實索引
this.end = end;//結束索引
this.exclusive = exclusive;//表示是否包含結束索引
},
_each: function(iterator) {
var value = this.start;
do {
iterator(value);
value = value.succ();
} while (this.include(value));
},
//重寫枚舉接口的include方法,判斷改循環的索引是否包含參數value的指定的值
include: function(value) {
if (value < this.start)
return false;
if (this.exclusive)
return value < this.end;
return value <= this.end;
}
});
//使用$R()方法快速創建objectRange對象
var $R = function(start, end, exclusive) {
return new ObjectRange(start, end, exclusive);
}
/*========================================================================================*/
/* 【Ajax模塊】
/*========================================================================================*/
//【ajax對象】
var Ajax = {//創建瀏覽器兼容的XMLHttpRequest對象
getTransport: function() {
return Try.these(
function() {return new ActiveXObject('Msxml2.XMLHTTP')},
function() {return new ActiveXObject('Microsoft.XMLHTTP')},
function() {return new XMLHttpRequest()}
) || false;
},
//當前激活的請求數目
activeRequestCount: 0
}
//【Ajax.Responders對象】
Ajax.Responders = {
responders: [],//表示所有響應處理代理
_each: function(iterator) {
this.responders._each(iterator);
},
//註冊一個響應代理
register: function(responderToAdd) {
if (!this.include(responderToAdd))
this.responders.push(responderToAdd);
},
//刪除一個響應代理
unregister: function(responderToRemove) {
this.responders = this.responders.without(responderToRemove);
},
//分發一個回調函數,讓所有半酣callback回調函數事件標識符的響應代理都被調用
//傳遞三個參數最後一個可選表示Json對象
dispatch: function(callback, request, transport, json) {
this.each(function(responder) {
if (responder[callback] && typeof responder[callback] == 'function') {
try {
responder[callback].apply(responder, [request, transport, json]);
} catch (e) {}
}
});
}
};
Object.extend(Ajax.Responders, Enumerable);
//統計當前活動請求的數目
Ajax.Responders.register({
//開始創建了一個請求
onCreate: function() {
Ajax.activeRequestCount++;
},
//請求結束
onComplete: function() {
Ajax.activeRequestCount--;
}
});
//【Ajax.Base類】進行服務器通信的基類
Ajax.Base = function() {};
Ajax.Base.prototype = {
setOptions: function(options) {
this.options = {
method: 'post',
asynchronous: true,
parameters: ''
}
Object.extend(this.options, options || {});
},
responseIsSuccess: function() {
return this.transport.status == undefined
|| this.transport.status == 0
|| (this.transport.status >= 200 && this.transport.status < 300);
},
responseIsFailure: function() {
return !this.responseIsSuccess();
}
}
//【Ajax.Request類】用於向服務器端發送請求,封裝了XmlHttpRequest
Ajax.Request = Class.create();
Ajax.Request.Events =
['Uninitialized', 'Loading', 'Loaded', 'Interactive', 'Complete'];
Ajax.Request.prototype = Object.extend(new Ajax.Base(), {
initialize: function(url, options) {
this.transport = Ajax.getTransport();
this.setOptions(options);//使用基類方法設置
this.request(url);
},
//向指定url發送請求 一般不會顯示調用
request: function(url) {
var parameters = this.options.parameters || '';
if (parameters.length > 0) parameters += '&_=';
try {
this.url = url;
if (this.options.method == 'get' && parameters.length > 0)
this.url += (this.url.match(/?/) ? '&' : '?') + parameters;
Ajax.Responders.dispatch('onCreate', this, this.transport);
this.transport.open(this.options.method, this.url,
this.options.asynchronous);
if (this.options.asynchronous) {
this.transport.onreadystatechange = this.onStateChange.bind(this);
setTimeout((function() {this.respondToReadyState(1)}).bind(this), 10);
}
this.setRequestHeaders();
var body = this.options.postBody ? this.options.postBody : parameters;
this.transport.send(this.options.method == 'post' ? body : null);
} catch (e) {
this.dispatchException(e);
}
},
//設置請求的Http頭 類內部使用 一般無需顯示調用
setRequestHeaders: function() {
var requestHeaders =
['X-Requested-With', 'XMLHttpRequest',
'X-Prototype-Version', Prototype.Version];
if (this.options.method == 'post') {
requestHeaders.push('Content-type',
'application/x-www-form-urlencoded');
/* Force "Connection: close" for Mozilla browsers to work around
* a bug where XMLHttpReqeuest sends an incorrect Content-length
* header. See Mozilla Bugzilla #246651.
*/
if (this.transport.overrideMimeType)
requestHeaders.push('Connection', 'close');
}
if (this.options.requestHeaders)
requestHeaders.push.apply(requestHeaders, this.options.requestHeaders);
for (var i = 0; i < requestHeaders.length; i += 2)
this.transport.setRequestHeader(requestHeaders[i], requestHeaders[i+1]);
},
//檢測XMLHttpRquest對象的onstatechange事件類內部使用 一般無需顯示調用
onStateChange: function() {
var readyState = this.transport.readyState;
if (readyState != 1)
this.respondToReadyState(this.transport.readyState);
},
//獲取指定的Http頭的內容
header: function(name) {
try {
return this.transport.getResponseHeader(name);
} catch (e) {}
},
//如果服務器返回了Http頭"X-JOSN"則將其作爲js執行並返回執行結果
evalJSON: function() {
try {
return eval(this.header('X-JSON'));
} catch (e) {}
},
//將XMLHttpRequest返回的responseText作爲JS語句執行並返回執行結果
evalResponse: function() {
try {
return eval(this.transport.responseText);
} catch (e) {
this.dispatchException(e);
}
},
//處理XMLHttpRequest的readystate屬性根據成功或失敗調用Options對象中相應的回調函數
//同時通知Ajax.Responders中註冊的響應處理句柄
respondToReadyState: function(readyState) {
var event = Ajax.Request.Events[readyState];
var transport = this.transport, json = this.evalJSON();
if (event == 'Complete') {
try {
(this.options['on' + this.transport.status]
|| this.options['on' + (this.responseIsSuccess() ? 'Success' : 'Failure')]
|| Prototype.emptyFunction)(transport, json);
} catch (e) {
this.dispatchException(e);
}
if ((this.header('Content-type') || '').match(/^text/javascript/i))
this.evalResponse();
}
try {
(this.options['on' + event] || Prototype.emptyFunction)(transport, json);
Ajax.Responders.dispatch('on' + event, this, transport, json);
} catch (e) {
this.dispatchException(e);
}
/* Avoid memory leak in MSIE: clean up the oncomplete event handler */
if (event == 'Complete')
this.transport.onreadystatechange = Prototype.emptyFunction;
},
dispatchException: function(exception) {
(this.options.onException || Prototype.emptyFunction)(this, exception);
Ajax.Responders.dispatch('onException', this, exception);
}
});
/*========================================================================================*/
//【Ajax.Updater類】用於將獲取的內容填充到指定的容器中去
Ajax.Updater = Class.create();
Object.extend(Object.extend(Ajax.Updater.prototype, Ajax.Request.prototype), {
//重寫了構造函數
initialize: function(container, url, options) {
this.containers = {
success: container.success ? $(container.success) : $(container),
failure: container.failure ? $(container.failure) :
(container.success ? null : $(container))
}
this.transport = Ajax.getTransport();
this.setOptions(options);//可以指定evalscripts屬性和insertion屬性
var onComplete = this.options.onComplete || Prototype.emptyFunction;
this.options.onComplete = (function(transport, object) {
this.updateContent();
onComplete(transport, object);
}).bind(this);
this.request(url);
},
updateContent: function() {
var receiver = this.responseIsSuccess() ?
this.containers.success : this.containers.failure;
var response = this.transport.responseText;
if (!this.options.evalScripts)
response = response.stripScripts();
if (receiver) {
if (this.options.insertion) {
new this.options.insertion(receiver, response);
} else {
Element.update(receiver, response);
}
}
if (this.responseIsSuccess()) {
if (this.onComplete)
setTimeout(this.onComplete.bind(this), 10);
}
}
});
/*========================================================================================*/
//【Ajax.PeriodicalUpdater類】用於定時執行服務器異步調用,功能與Updater相同只是有了定時功能
Ajax.PeriodicalUpdater = Class.create();
Ajax.PeriodicalUpdater.prototype = Object.extend(new Ajax.Base(), {
initialize: function(container, url, options) {
this.setOptions(options);
this.onComplete = this.options.onComplete;
//區別就在下面兩個屬性 頻率 衰減參數 指數增長!只要有一次不同舊回覆原有頻率
this.frequency = (this.options.frequency || 2);
this.decay = (this.options.decay || 1);
this.updater = {};
this.container = container;
this.url = url;
this.start();
},
start: function() {
this.options.onComplete = this.updateComplete.bind(this);
this.onTimerEvent();
},
stop: function() {
this.updater.onComplete = undefined;
clearTimeout(this.timer);
(this.onComplete || Prototype.emptyFunction).apply(this, arguments);
},
updateComplete: function(request) {
if (this.options.decay) {
this.decay = (request.responseText == this.lastText ?
this.decay * this.options.decay : 1);
this.lastText = request.responseText;
}
this.timer = setTimeout(this.onTimerEvent.bind(this),
this.decay * this.frequency * 1000);
},
onTimerEvent: function() {
this.updater = new Ajax.Updater(this.container, this.url, this.options);
}
});
/*========================================================================================*/
/*【文檔操作的封裝】
/*========================================================================================*/
//返回了一個數組包含了所有符合條件的結點的引用
document.getElementsByClassName = function(className, parentElement) { //parentElement不指定就在全局查找
var children = ($(parentElement) || document.body).getElementsByTagName('*');
return $A(children).inject([], function(elements, child) {
if (child.className.match(new RegExp("(^|s)" + className + "(s|$)")))
elements.push(child);
return elements;
});
}
/*【Element對象】用於對文檔結點做一些統一的操作
*/
if (!window.Element) {
var Element = new Object();
}
Object.extend(Element, {
visible: function(element) {
return $(element).style.display != 'none';
},
//指定結點可見性的切換
toggle: function() {
for (var i = 0; i < arguments.length; i++) {
var element = $(arguments[i]);
Element[Element.visible(element) ? 'hide' : 'show'](element);
}
},
hide: function() {
for (var i = 0; i < arguments.length; i++) {
var element = $(arguments[i]);
element.style.display = 'none';
}
},
show: function() {
for (var i = 0; i < arguments.length; i++) {
var element = $(arguments[i]);
element.style.display = '';
}
},
remove: function(element) {
element = $(element);
element.parentNode.removeChild(element);
},
//將html片段填充到element指定的結點中
update: function(element, html) {
$(element).innerHTML = html.stripScripts();
setTimeout(function() {html.evalScripts()}, 10);
},
//獲得element的絕對高度
getHeight: function(element) {
element = $(element);
return element.offsetHeight;
},
classNames: function(element) {
return new Element.ClassNames(element);
},
hasClassName: function(element, className) {
if (!(element = $(element))) return;
return Element.classNames(element).include(className);
},
addClassName: function(element, className) {
if (!(element = $(element))) return;
return Element.classNames(element).add(className);
},
removeClassName: function(element, className) {
if (!(element = $(element))) return;
return Element.classNames(element).remove(className);
},
// removes whitespace-only text node children
cleanWhitespace: function(element) {
element = $(element);
for (var i = 0; i < element.childNodes.length; i++) {
var node = element.childNodes[i];
if (node.nodeType == 3 && !/S/.test(node.nodeValue))
Element.remove(node);
}
},
empty: function(element) {
return $(element).innerHTML.match(/^s*$/);
},
//將瀏覽器的滾動條滾動到指定的結點的位置
scrollTo: function(element) {
element = $(element);
var x = element.x ? element.x : element.offsetLeft,
y = element.y ? element.y : element.offsetTop;
window.scrollTo(x, y);
},
//得到element的結點的絕對樣式
getStyle: function(element, style) {
element = $(element);
var value = element.style[style.camelize()];
if (!value) {
if (document.defaultView && document.defaultView.getComputedStyle) {
var css = document.defaultView.getComputedStyle(element, null);
value = css ? css.getPropertyValue(style) : null;
} else if (element.currentStyle) {
value = element.currentStyle[style.camelize()];
}
}
if (window.opera && ['left', 'top', 'right', 'bottom'].include(style))
if (Element.getStyle(element, 'position') == 'static') value = 'auto';
return value == 'auto' ? null : value;
},
//設置結點樣式 var style={background-color:'black',color:'red'} Element.setStyle($('div1'),style)
setStyle: function(element, style) {
element = $(element);
for (name in style)
element.style[name.camelize()] = style[name];
},
//獲得結點的寬度高度 該方法無論結點是否可見 都能獲得其大小
getDimensions: function(element) {
element = $(element);
if (Element.getStyle(element, 'display') != 'none')
return {width: element.offsetWidth, height: element.offsetHeight};
// All *Width and *Height properties give 0 on elements with display none,
// so enable the element temporarily
var els = element.style;
var originalVisibility = els.visibility;
var originalPosition = els.position;
els.visibility = 'hidden';
els.position = 'absolute';
els.display = '';
var originalWidth = element.clientWidth;
var originalHeight = element.clientHeight;
els.display = 'none';
els.position = originalPosition;
els.visibility = originalVisibility;
return {width: originalWidth, height: originalHeight};
},
//相對定位
makePositioned: function(element) {
element = $(element);
var pos = Element.getStyle(element, 'position');
if (pos == 'static' || !pos) {
element._madePositioned = true;
element.style.position = 'relative';
// Opera returns the offset relative to the positioning context, when an
// element is position relative but top and left have not been defined
if (window.opera) {
element.style.top = 0;
element.style.left = 0;
}
}
},
//取消相對定位
undoPositioned: function(element) {
element = $(element);
if (element._madePositioned) {
element._madePositioned = undefined;
element.style.position =
element.style.top =
element.style.left =
element.style.bottom =
element.style.right = '';
}
},
//使結點隱藏超出的部分 overflow=relative
makeClipping: function(element) {
element = $(element);
if (element._overflow) return;
element._overflow = element.style.overflow;
if ((Element.getStyle(element, 'overflow') || 'visible') != 'hidden')
element.style.overflow = 'hidden';
},
undoClipping: function(element) {
element = $(element);
if (element._overflow) return;
element.style.overflow = element._overflow;
element._overflow = undefined;
}
});
/*========================================================================================*/
//Toggle對象是Element.toggle方法的一個快捷用法
var Toggle = new Object();
Toggle.display = Element.toggle;
/*========================================================================================*/
//【Insertion命名空間】包含了4個類把指定的html片段插入到指定的結點的相應位置上
Abstract.Insertion = function(adjacency) {
this.adjacency = adjacency;
}
Abstract.Insertion.prototype = {
initialize: function(element, content) {
this.element = $(element);
this.content = content.stripScripts();
if (this.adjacency && this.element.insertAdjacentHTML) {
try {
this.element.insertAdjacentHTML(this.adjacency, this.content);
} catch (e) {
if (this.element.tagName.toLowerCase() == 'tbody') {
this.insertContent(this.contentFromAnonymousTable());
} else {
throw e;
}
}
} else {
this.range = this.element.ownerDocument.createRange();
if (this.initializeRange) this.initializeRange();
this.insertContent([this.range.createContextualFragment(this.content)]);
}
setTimeout(function() {content.evalScripts()}, 10);
},
contentFromAnonymousTable: function() {
var div = document.createElement('div');
div.innerHTML = '<table><tbody>' + this.content + '</tbody></table>';
return $A(div.childNodes[0].childNodes[0].childNodes);
}
}
var Insertion = new Object();
Insertion.Before = Class.create();
Insertion.Before.prototype = Object.extend(new Abstract.Insertion('beforeBegin'), {
initializeRange: function() {
this.range.setStartBefore(this.element);
},
insertContent: function(fragments) {
fragments.each((function(fragment) {
this.element.parentNode.insertBefore(fragment, this.element);
}).bind(this));
}
});
Insertion.Top = Class.create();
Insertion.Top.prototype = Object.extend(new Abstract.Insertion('afterBegin'), {
initializeRange: function() {
this.range.selectNodeContents(this.element);
this.range.collapse(true);
},
insertContent: function(fragments) {
fragments.reverse(false).each((function(fragment) {
this.element.insertBefore(fragment, this.element.firstChild);
}).bind(this));
}
});
Insertion.Bottom = Class.create();
Insertion.Bottom.prototype = Object.extend(new Abstract.Insertion('beforeEnd'), {
initializeRange: function() {
this.range.selectNodeContents(this.element);
this.range.collapse(this.element);
},
insertContent: function(fragments) {
fragments.each((function(fragment) {
this.element.appendChild(fragment);
}).bind(this));
}
});
Insertion.After = Class.create();
Insertion.After.prototype = Object.extend(new Abstract.Insertion('afterEnd'), {
initializeRange: function() {
this.range.setStartAfter(this.element);
},
insertContent: function(fragments) {
fragments.each((function(fragment) {
this.element.parentNode.insertBefore(fragment,
this.element.nextSibling);
}).bind(this));
}
});
/*========================================================================================*/
//【Element.ClassNames】獲得一個結點的所有的class名稱組成的對象,實現了枚舉接口
Element.ClassNames = Class.create();
Element.ClassNames.prototype = {
initialize: function(element) {
this.element = $(element);
},
_each: function(iterator) {
this.element.className.split(/s+/).select(function(name) {
return name.length > 0;
})._each(iterator);
},
set: function(className) {
this.element.className = className;
},
add: function(classNameToAdd) {
if (this.include(classNameToAdd)) return;
this.set(this.toArray().concat(classNameToAdd).join(' '));
},
remove: function(classNameToRemove) {
if (!this.include(classNameToRemove)) return;
this.set(this.select(function(className) {
return className != classNameToRemove;
}).join(' '));
},
toString: function() {//獲得所有class的字符串表示空格隔開
return this.toArray().join(' ');
}
}
//表單域對象工具類
Object.extend(Element.ClassNames.prototype, Enumerable);
var Field = {
clear: function() {
for (var i = 0; i < arguments.length; i++)
$(arguments[i]).value = '';
},
focus: function(element) {
$(element).focus();
},
present: function() {
for (var i = 0; i < arguments.length; i++)
if ($(arguments[i]).value == '') return false;
return true;
},
//選中表單域
select: function(element) {
$(element).select();
},
//focus + select
activate: function(element) {
element = $(element);
element.focus();
if (element.select)
element.select();
}
}
/*【Form】表單工具對象*/
var Form = {
//表單數據序列化
serialize: function(form) {
var elements = Form.getElements($(form));
var queryComponents = new Array();
for (var i = 0; i < elements.length; i++) {
var queryComponent = Form.Element.serialize(elements[i]);
if (queryComponent)
queryComponents.push(queryComponent);
}
return queryComponents.join('&');
},
//獲取所有表單域按照標記名排列
getElements: function(form) {
form = $(form);
var elements = new Array();
for (tagName in Form.Element.Serializers) {
var tagElements = form.getElementsByTagName(tagName);
for (var j = 0; j < tagElements.length; j++)
elements.push(tagElements[j]);
}
return elements;
},
//有一個滿足就返回
getInputs: function(form, typeName, name) {
form = $(form);
var inputs = form.getElementsByTagName('input');
if (!typeName && !name)
return inputs;
var matchingInputs = new Array();
for (var i = 0; i < inputs.length; i++) {
var input = inputs[i];
if ((typeName && input.type != typeName) ||
(name && input.name != name))
continue;
matchingInputs.push(input);
}
return matchingInputs;
},
//整個表單域禁用
disable: function(form) {
var elements = Form.getElements(form);
for (var i = 0; i < elements.length; i++) {
var element = elements[i];
element.blur();
element.disabled = 'true';
}
},
//啓用
enable: function(form) {
var elements = Form.getElements(form);
for (var i = 0; i < elements.length; i++) {
var element = elements[i];
element.disabled = '';
}
},
//獲取第一個可用的表單域
findFirstElement: function(form) {
return Form.getElements(form).find(function(element) {
return element.type != 'hidden' && !element.disabled &&
['input', 'select', 'textarea'].include(element.tagName.toLowerCase());
});
},
//激活第一個表單域
focusFirstElement: function(form) {
Field.activate(Form.findFirstElement(form));
},
reset: function(form) {
$(form).reset();
}
}
//【Form.Element】 對特定的表單域進行操作
Form.Element = {
//序列化形成"&name=value"
serialize: function(element) {
element = $(element);
var method = element.tagName.toLowerCase();
var parameter = Form.Element.Serializers[method](element);
if (parameter) {
var key = encodeURIComponent(parameter[0]);
if (key.length == 0) return;
if (parameter[1].constructor != Array)
parameter[1] = [parameter[1]];
return parameter[1].map(function(value) {
return key + '=' + encodeURIComponent(value);
}).join('&');
}
},
//獲得指定表單域的值
getValue: function(element) {
element = $(element);
var method = element.tagName.toLowerCase();
var parameter = Form.Element.Serializers[method](element);
if (parameter)
return parameter[1];
}
}
//【Form.Element.Serializers】針對不同的表單域進行序列化
Form.Element.Serializers = {
//一般用所有的<input>標記的序列化都可以
input: function(element) {
switch (element.type.toLowerCase()) {
case 'submit':
case 'hidden':
case 'password':
case 'text':
return Form.Element.Serializers.textarea(element);
case 'checkbox':
case 'radio':
return Form.Element.Serializers.inputSelector(element);
}
return false;
},
inputSelector: function(element) {
if (element.checked)
return [element.name, element.value];
},
textarea: function(element) {
return [element.name, element.value];
},
select: function(element) {
return Form.Element.Serializers[element.type == 'select-one' ?
'selectOne' : 'selectMany'](element);
},
selectOne: function(element) {
var value = '', opt, index = element.selectedIndex;
if (index >= 0) {
opt = element.options[index];
value = opt.value;
if (!value && !('value' in opt))
value = opt.text;
}
return [element.name, value];
},
selectMany: function(element) {
var value = new Array();
for (var i = 0; i < element.length; i++) {
var opt = element.options[i];
if (opt.selected) {
var optValue = opt.value;
if (!optValue && !('value' in opt))
optValue = opt.text;
value.push(optValue);
}
}
return [element.name, value];
}
}
//【獲得表單域的值】
var $F = Form.Element.getValue;
/*========================================================================================*/
/*【Observer模式框架】 觀察對象僅僅針對表單和表單域*/
/*========================================================================================*/
Abstract.TimedObserver = function() {}//定義了基於定時器的觀察模式基類後面的類都繼承了這個類
Abstract.TimedObserver.prototype = {
initialize: function(element, frequency, callback) {
this.frequency = frequency;//觀察頻率
this.element = $(element);//被觀察的對象
this.callback = callback;//回調函數接受參數 被觀察對象自身和觸發事件時的值
this.lastValue = this.getValue();//這是觀察的值!!
this.registerCallback();
},
//註冊回調函數
registerCallback: function() {
setInterval(this.onTimerEvent.bind(this), this.frequency * 1000);
},
//每一個時間片觸發一次該事件
onTimerEvent: function() {
var value = this.getValue();
if (this.lastValue != value) {
this.callback(this.element, value);
this.lastValue = value;
}
}
}
//【Form.Element.Observer類】實現了getvalue方法
Form.Element.Observer = Class.create();
Form.Element.Observer.prototype = Object.extend(new Abstract.TimedObserver(), {
getValue: function() {
return Form.Element.getValue(this.element);
}
});
//【Form.Observer類】實現了getvalue方法,只要有一個表單域發生變化就會觸發回調
Form.Observer = Class.create();
Form.Observer.prototype = Object.extend(new Abstract.TimedObserver(), {
getValue: function() {
return Form.serialize(this.element);
}
});
//【Abstract.EventObserver 類】基於事件的Oberver模式的基類 後面的具體類都繼承這個類
Abstract.EventObserver = function() {}
Abstract.EventObserver.prototype = {
initialize: function(element, callback) {
this.element = $(element);
this.callback = callback;
this.lastValue = this.getValue();
if (this.element.tagName.toLowerCase() == 'form')
this.registerFormCallbacks();
else
this.registerCallback(this.element);
},
//每次發生事件時被調用 內部調用 無需顯示調用
onElementEvent: function() {
var value = this.getValue();
if (this.lastValue != value) {
this.callback(this.element, value);
this.lastValue = value;
}
},
//註冊表表單域事件
registerFormCallbacks: function() {
var elements = Form.getElements(this.element);
for (var i = 0; i < elements.length; i++)
this.registerCallback(elements[i]);
},
registerCallback: function(element) {
if (element.type) {
switch (element.type.toLowerCase()) {
case 'checkbox':
case 'radio':
Event.observe(element, 'click', this.onElementEvent.bind(this));
break;
case 'password':
case 'text':
case 'textarea':
case 'select-one':
case 'select-multiple':
Event.observe(element, 'change', this.onElementEvent.bind(this));
break;
}
}
}
}
//【Form.Element.EventObserver】
Form.Element.EventObserver = Class.create();
Form.Element.EventObserver.prototype = Object.extend(new Abstract.EventObserver(), {
getValue: function() {
return Form.Element.getValue(this.element);
}
});
//【Form.EventObserver】
Form.EventObserver = Class.create();
Form.EventObserver.prototype = Object.extend(new Abstract.EventObserver(), {
getValue: function() {
return Form.serialize(this.element);
}
});
/*========================================================================================*/
/*【事件處理:對Event對象的擴展】對javascript事件處理機制進行封裝*/
/*========================================================================================*/
if (!window.Event) {
var Event = new Object();
}
Object.extend(Event, {
KEY_BACKSPACE: 8,
KEY_TAB: 9,
KEY_RETURN: 13,
KEY_ESC: 27,
KEY_LEFT: 37,
KEY_UP: 38,
KEY_RIGHT: 39,
KEY_DOWN: 40,
KEY_DELETE: 46,
//獲取觸發事件的對象
element: function(event) {
return event.target || event.srcElement;
},
isLeftClick: function(event) {
return (((event.which) && (event.which == 1)) ||
((event.button) && (event.button == 1)));
},
pointerX: function(event) {
return event.pageX || (event.clientX +
(document.documentElement.scrollLeft || document.body.scrollLeft));
},
pointerY: function(event) {
return event.pageY || (event.clientY +
(document.documentElement.scrollTop || document.body.scrollTop));
},
//停止事件的傳遞
stop: function(event) {
if (event.preventDefault) {
event.preventDefault();
event.stopPropagation();
} else {
event.returnValue = false;
event.cancelBubble = true;
}
},
// find the first node with the given tagName, starting from the
// node the event was triggered on; traverses the DOM upwards
findElement: function(event, tagName) {
var element = Event.element(event);
while (element.parentNode && (!element.tagName ||
(element.tagName.toUpperCase() != tagName.toUpperCase())))
element = element.parentNode;
return element;
},
observers: false,
_observeAndCache: function(element, name, observer, useCapture) {
if (!this.observers) this.observers = [];
if (element.addEventListener) {
this.observers.push([element, name, observer, useCapture]);
element.addEventListener(name, observer, useCapture);
} else if (element.attachEvent) {
this.observers.push([element, name, observer, useCapture]);
element.attachEvent('on' + name, observer);
}
},
//刪除所有通過Event.observers綁定的事件
unloadCache: function() {
if (!Event.observers) return;
for (var i = 0; i < Event.observers.length; i++) {
Event.stopObserving.apply(this, Event.observers[i]);
Event.observers[i][0] = null;
}
Event.observers = false;
},
//綁定一個事件
observe: function(element, name, observer, useCapture) {
var element = $(element);
useCapture = useCapture || false;
if (name == 'keypress' &&
(navigator.appVersion.match(/Konqueror|Safari|KHTML/)
|| element.attachEvent))
name = 'keydown';
this._observeAndCache(element, name, observer, useCapture);
},
//取消事件綁定
stopObserving: function(element, name, observer, useCapture) {
var element = $(element);
useCapture = useCapture || false;
if (name == 'keypress' &&
(navigator.appVersion.match(/Konqueror|Safari|KHTML/)
|| element.detachEvent))
name = 'keydown';
if (element.removeEventListener) {
element.removeEventListener(name, observer, useCapture);
} else if (element.detachEvent) {
element.detachEvent('on' + name, observer);
}
}
});
//【結點的位置處理:Position對象】
/* prevent memory leaks in IE */
Event.observe(window, 'unload', Event.unloadCache, false);
var Position = {
// set to true if needed, warning: firefox performance problems
// NOT neeeded for page scrolling, only if draggable contained in
// scrollable elements
includeScrollOffsets: false,
// must be called before calling withinIncludingScrolloffset, every time the
// page is scrolled用於計算滾動條的位置信息
prepare: function() {
this.deltaX = window.pageXOffset
|| document.documentElement.scrollLeft
|| document.body.scrollLeft
|| 0;
this.deltaY = window.pageYOffset
|| document.documentElement.scrollTop
|| document.body.scrollTop
|| 0;
},
//計算節點的絕對滾動位置返回包含兩個元素的數組到文檔左側 頂部的距離
realOffset: function(element) {
var valueT = 0, valueL = 0;
do {
valueT += element.scrollTop || 0;
valueL += element.scrollLeft || 0;
element = element.parentNode;
} while (element);
return [valueL, valueT];
},
//計算結點相對於文檔的絕對滾動位置,返回包含兩個元素的數組到文檔左側 頂部的距離
cumulativeOffset: function(element) {
var valueT = 0, valueL = 0;
do {
valueT += element.offsetTop || 0;
valueL += element.offsetLeft || 0;
element = element.offsetParent;
} while (element);
return [valueL, valueT];
},
//相對位置
positionedOffset: function(element) {
var valueT = 0, valueL = 0;
do {
valueT += element.offsetTop || 0;
valueL += element.offsetLeft || 0;
element = element.offsetParent;
if (element) {
p = Element.getStyle(element, 'position');
if (p == 'relative' || p == 'absolute') break;
}
} while (element);
return [valueL, valueT];
},
offsetParent: function(element) {
if (element.offsetParent) return element.offsetParent;
if (element == document.body) return element;
while ((element = element.parentNode) && element != document.body)
if (Element.getStyle(element, 'position') != 'static')
return element;
return document.body;
},
// caches x/y coordinate pair to use with overlap是否在element內
within: function(element, x, y) {
if (this.includeScrollOffsets)
return this.withinIncludingScrolloffsets(element, x, y);
this.xcomp = x;
this.ycomp = y;
this.offset = this.cumulativeOffset(element);
return (y >= this.offset[1] &&
y < this.offset[1] + element.offsetHeight &&
x >= this.offset[0] &&
x < this.offset[0] + element.offsetWidth);
},
withinIncludingScrolloffsets: function(element, x, y) {
var offsetcache = this.realOffset(element);
this.xcomp = x + offsetcache[0] - this.deltaX;
this.ycomp = y + offsetcache[1] - this.deltaY;
this.offset = this.cumulativeOffset(element);
return (this.ycomp >= this.offset[1] &&
this.ycomp < this.offset[1] + element.offsetHeight &&
this.xcomp >= this.offset[0] &&
this.xcomp < this.offset[0] + element.offsetWidth);
},
// within must be called directly before
overlap: function(mode, element) {
if (!mode) return 0;
if (mode == 'vertical')
return ((this.offset[1] + element.offsetHeight) - this.ycomp) /
element.offsetHeight;
if (mode == 'horizontal')
return ((this.offset[0] + element.offsetWidth) - this.xcomp) /
element.offsetWidth;
},
//克隆結點 常用於拖放
clone: function(source, target) {
source = $(source);
target = $(target);
target.style.position = 'absolute';
var offsets = this.cumulativeOffset(source);
target.style.top = offsets[1] + 'px';
target.style.left = offsets[0] + 'px';
target.style.width = source.offsetWidth + 'px';
target.style.height = source.offsetHeight + 'px';
},
page: function(forElement) {
var valueT = 0, valueL = 0;
var element = forElement;
do {
valueT += element.offsetTop || 0;
valueL += element.offsetLeft || 0;
// Safari fix
if (element.offsetParent==document.body)
if (Element.getStyle(element,'position')=='absolute') break;
} while (element = element.offsetParent);
element = forElement;
do {
valueT -= element.scrollTop || 0;
valueL -= element.scrollLeft || 0;
} while (element = element.parentNode);
return [valueL, valueT];
},
clone: function(source, target) {
var options = Object.extend({
setLeft: true,
setTop: true,
setWidth: true,
setHeight: true,
offsetTop: 0,
offsetLeft: 0
}, arguments[2] || {})
// find page position of source
source = $(source);
var p = Position.page(source);
// find coordinate system to use
target = $(target);
var delta = [0, 0];
var parent = null;
// delta [0,0] will do fine with position: fixed elements,
// position:absolute needs offsetParent deltas
if (Element.getStyle(target,'position') == 'absolute') {
parent = Position.offsetParent(target);
delta = Position.page(parent);
}
// correct by body offsets (fixes Safari)
if (parent == document.body) {
delta[0] -= document.body.offsetLeft;
delta[1] -= document.body.offsetTop;
}
// set position
if(options.setLeft) target.style.left = (p[0] - delta[0] + options.offsetLeft) + 'px';
if(options.setTop) target.style.top = (p[1] - delta[1] + options.offsetTop) + 'px';
if(options.setWidth) target.style.width = source.offsetWidth + 'px';
if(options.setHeight) target.style.height = source.offsetHeight + 'px';
},
//絕對定位
absolutize: function(element) {
element = $(element);
if (element.style.position == 'absolute') return;
Position.prepare();
var offsets = Position.positionedOffset(element);
var top = offsets[1];
var left = offsets[0];
var width = element.clientWidth;
var height = element.clientHeight;
element._originalLeft = left - parseFloat(element.style.left || 0);
element._originalTop = top - parseFloat(element.style.top || 0);
element._originalWidth = element.style.width;
element._originalHeight = element.style.height;
element.style.position = 'absolute';
element.style.top = top + 'px';;
element.style.left = left + 'px';;
element.style.width = width + 'px';;
element.style.height = height + 'px';;
},
//相對定位
relativize: function(element) {
element = $(element);
if (element.style.position == 'relative') return;
Position.prepare();
element.style.position = 'relative';
var top = parseFloat(element.style.top || 0) - (element._originalTop || 0);
var left = parseFloat(element.style.left || 0) - (element._originalLeft || 0);
element.style.top = top + 'px';
element.style.left = left + 'px';
element.style.height = element._originalHeight;
element.style.width = element._originalWidth;
}
}
// Safari returns margins on body which is incorrect if the child is absolutely
// positioned. For performance reasons, redefine Position.cumulativeOffset for
// KHTML/WebKit only.
if (/Konqueror|Safari|KHTML/.test(navigator.userAgent)) {
Position.cumulativeOffset = function(element) {
var valueT = 0, valueL = 0;
do {
valueT += element.offsetTop || 0;
valueL += element.offsetLeft || 0;
if (element.offsetParent == document.body)
if (Element.getStyle(element, 'position') == 'absolute') break;
element = element.offsetParent;
} while (element);
return [valueL, valueT];
}
}
//--------->完成
* (c) 2005 Sam Stephenson <[email protected]>
*
* Prototype is freely distributable under the terms of an MIT-style license.
* For details, see the Prototype web site: http://prototype.conio.net/
* 這是一個JavaScript的框架,致力於簡化動態的Web開發,完全按照面對對象的思想
* 進行Javascript開發,添加了迭代器的概念增強Javascript的設計能力。
* Prototype框架構思獨特充滿了技巧性的代碼,方便易用的工具類!
*
/*--------------------------------------------------------------------------*/
/* 【Prototype】定義一個全局對象,提供一個全局的基本信息和工具 */
var Prototype = {
Version: '1.4.0', //可以作爲版本檢測用
//用於腳本檢測的正則表達式,經常使用所以放在這裏起到全局常量的作用
ScriptFragment: '(?:<script.*?>)(( | |.)*?)(?:</script>)',
emptyFunction: function() {},//空函數
K: function(x) {return x}//K方法返回參數本身,在後面經常用到
}
/*========================================================================================*/
/*
*【Class】對象的作用只有一個就是提供了一個定義類的模式
* 僅含有create 一個方法,返回一個構造函數。
* 一般使用如下
* var X = Class.create(); 返回一個類型
* 要使用 X 類型,需繼續用 new X()來獲取一個實例 這與C# JAVA類似
* 返回的構造函數會執行名爲 initialize 的方法, initialize 是 Ruby 對象的構造器方法名字。
* 此時initialize方法還沒有定義,其後的代碼中創建新類型時會建立相應的同名方法,可以看作是一個抽象方法。
* 從C#角度講可以理解爲用Class.create()創建一個繼承Object基類的類。
*
*/
var Class = {
create: function() {
return function() { //下面使用Apply方法傳遞參數是一個常用的技巧
this.initialize.apply(this, arguments);
}
}
}
/*========================================================================================*/
//Abstract是一個空對象,它的作用僅僅是作爲一個抽象的命名空間,所有在該對象下定義的類都是抽象類
//從而從形式上與實體類分開
var Abstract = new Object();
/*
*Object是所有對象的基類,這個基類有兩個靜態方法
*/
//把Source的所有屬性和方法傳遞給Destination,實現了繼承的效果
Object.extend = function(destination, source) {
for (property in source) {
destination[property] = source[property];
}
return destination;
}
//觀察Object的組成,需要參數中的object實現自己的inspect方法
Object.inspect = function(object) {
try {
if (object == undefined) return 'undefined';
if (object == null) return 'null';
return object.inspect ? object.inspect() : object.toString();
} catch (e) {
if (e instanceof RangeError) return '';
throw e;
}
}
/*========================================================================================*/
//【Function】是所有函數對象的基類,可以通過對它的擴展實現對所有函數對象添加功能
/* 這裏在綁定的時候舊可以傳遞參數而不是調用的時候才指定參數,bind方法接收多個參數
將函數綁定到第一個參數指定的對象上,並返回該方法的調用句柄
*/
Function.prototype.bind = function() {
// $A()方法的作用是把參數專爲數組
//數組的shift方法作用是刪除數組的第一個元素
var __method = this, args = $A(arguments), object = args.shift();
return function() {
return __method.apply(object, args.concat($A(arguments)));
//這裏的$A(arguments)是條用返回函數句柄時傳遞的參數,不是bind方法的參數
}
}
/**
* 和bind一樣,不過這個方法一般用做html控件對象的事件處理。所以要傳遞event對象
* 好像是重載了_method方法
*/
Function.prototype.bindAsEventListener = function(object) {
var __method = this;
return function(event) {
return __method.call(object, event || window.event);
}
}
/*========================================================================================*/
//【Function】是所有數值類型的基類
Object.extend(Number.prototype, {
toColorPart: function() { //RGB-》16進制顏色
var digits = this.toString(16);
if (this < 16) return '0' + digits;
return digits;
},
succ: function() { //數值加一 var a=1; var b=a.succ; 那麼b=2
return this + 1;
},
times: function(iterator) {
//這裏的參數iterator是一個迭代器作用就是循環調用指定次數的iterator函數
//$R(start,end,exclusive)是創建ObjectRnge對象的快捷方式
$R(0, this, true).each(iterator);
return this;
}
});
/*========================================================================================*/
//提供了一個方法these,要求參數是函數的句柄,可以有多個。作用就是返回第一個成功執行的函數的返回值
var Try = {
these: function() {
var returnValue;
for (var i = 0; i < arguments.length; i++) {
var lambda = arguments[i];
try {
returnValue = lambda();
break;
} catch (e) {}
}
return returnValue;
}
}
/*========================================================================================*/
//定時器類用來實現Window.setInterval的效果,在給定時間間隔執行某一個函數,增加了對重複執行的控制S
var PeriodicalExecuter = Class.create();
PeriodicalExecuter.prototype = {
initialize: function(callback, frequency) {
//構造函數指定回調函數和執行頻率,單位是秒
this.callback = callback;
this.frequency = frequency;
this.currentlyExecuting = false;
this.registerCallback();
},
/* 開始調用定時器,無需顯示調用,在構造函數中就實現了自動調用,這一下面的
this.onTimerEvent.bind(this)如果寫成this.onTimerEvent則this指針就會指向widows對象即setInterval的默認對象
從而不能正確的引用到下面兩個函數上,也就失去了對正在執行函數的控制
*/
registerCallback: function() {
setInterval(this.onTimerEvent.bind(this), this.frequency * 1000);
},
//下面的函數相當於是回調函數的一個代理, setInterval是到了指定的時間就會強制執行而這裏
//加入了一個判斷如果callback函數執行的時間超過了一個時間片,則阻止其被重複執行
onTimerEvent: function() {
if (!this.currentlyExecuting) {
try {
this.currentlyExecuting = true;
this.callback();
} finally {
this.currentlyExecuting = false;
}
}
}
}
/*使用舉例:
function GetOnlineCount()
{//獲得在線人數
}
new PeriodicalExecuter(GetOnlineCount,10)每10秒獲取一次
*/
/*========================================================================================*/
/* 框架核心內容--------【基礎工具類】
/*========================================================================================*/
/*document.getElementById(id)獲取一個指定ID的結點,是這個方法的快捷方式和擴展
可以指定多個參數返回一個對象數組。參數也不一定是ID也可以是對象本身的引用,例如
$('id')等價於$($('id'))
*/
function $() {
var elements = new Array();
for (var i = 0; i < arguments.length; i++) {
var element = arguments[i];
if (typeof element == 'string')
element = document.getElementById(element);
if (arguments.length == 1)
return element;
elements.push(element);
}
return elements;
}
/*========================================================================================*/
//【String】類的擴展
//刪除字符串中的HTML標記
Object.extend(String.prototype, {
stripTags: function() {
return this.replace(/</?[^>]+>/gi, '');
},
//刪除字符串中的腳本塊
stripScripts: function() {
return this.replace(new RegExp(Prototype.ScriptFragment, 'img'), '');
},
//提取字符串中的所有腳本塊,作爲數組返回,每一個腳本作爲一個數組元素
extractScripts: function() {
var matchAll = new RegExp(Prototype.ScriptFragment, 'img');
var matchOne = new RegExp(Prototype.ScriptFragment, 'im');
return (this.match(matchAll) || []).map(function(scriptTag) {
return (scriptTag.match(matchOne) || ['', ''])[1];
});
},
//提取字符串中的腳本並執行
evalScripts: function() {
return this.extractScripts().map(eval);
},
//將字符串進行html編碼例如"<" --》"<"
escapeHTML: function() {
var div = document.createElement('div');
var text = document.createTextNode(this);
div.appendChild(text);
return div.innerHTML;
},
//對字符串進行html解碼例如"<"--》"<"
unescapeHTML: function() {
var div = document.createElement('div');
div.innerHTML = this.stripTags();
return div.childNodes[0] ? div.childNodes[0].nodeValue : '';
},
//將查詢字符串格式的字符串轉換爲鍵值對數組
//例如var s="a=1&b=2&c=3"; var s2=s.toQueryParams(); s2爲{a:1,b:2,c:3}
toQueryParams: function() {
var pairs = this.match(/^??(.*)$/)[1].split('&');
return pairs.inject({}, function(params, pairString) {
var pair = pairString.split('=');
params[pair[0]] = pair[1];
return params;
});
},
//字符串轉換爲字符數組 "abc"-->['a','b','c']
toArray: function() {
return this.split('');
},
//連字符--》駱駝樣式 'good-man'-->'goodMan'
camelize: function() {
var oStringList = this.split('-');
if (oStringList.length == 1) return oStringList[0];
var camelizedString = this.indexOf('-') == 0
? oStringList[0].charAt(0).toUpperCase() + oStringList[0].substring(1)
: oStringList[0];
for (var i = 1, len = oStringList.length; i < len; i++) {
var s = oStringList[i];
camelizedString += s.charAt(0).toUpperCase() + s.substring(1);
}
return camelizedString;
},
//得到字符串的組成結構
inspect: function() {
/*這個加註釋爲了讓下面的顯示好看點
return "'" + this.replace('', '/').replace("'", ''') + "'";
*/ }
});
//定義了一個等價的函數
String.prototype.parseQuery = String.prototype.toQueryParams;
/*========================================================================================*/
//【Enumerable】可枚舉接口 是整個1.4.0框架的核心工具,所有實現此接口的類必須要實現_each(iterator)方法
var $break = new Object(); //首先定義了兩個異常對象,用於進行迭代計算的控制
var $continue = new Object();
var Enumerable = {
//用於對對象的每一個元素遍歷執行iterator迭代器函數
each: function(iterator) {
var index = 0; //可選參數表示元素在枚舉對象的次序
try {
this._each(function(value) {//value是枚舉元素的值
try {
iterator(value, index++);
} catch (e) {
if (e != $continue) throw e;
}
});
} catch (e) {
if (e != $break) throw e;
}
},
//判斷是否所有的枚舉元素都能使iterator返回true
all: function(iterator) {
var result = true;
this.each(function(value, index) {
result = result && !!(iterator || Prototype.K)(value, index);
if (!result) throw $break;
});
return result;
},
//判斷是否有枚舉元素能使iterator返回true,有一個就是True
any: function(iterator) {
var result = true;
this.each(function(value, index) {
if (result = !!(iterator || Prototype.K)(value, index))
throw $break;
});
return result;
},
//對所有的枚舉元素執行iterator迭代器函數 結果作爲一個數組返回
collect: function(iterator) {
var results = [];
this.each(function(value, index) {
results.push(iterator(value, index));
});
return results;
},
//第一個素能使iterator返回true的枚舉元素的值,沒有返回undefined
detect: function (iterator) {
var result;
this.each(function(value, index) {
if (iterator(value, index)) {
result = value;
throw $break;
}
});
return result;
},
//找到所有的能使iterator迭代器函數返回true的枚舉元素 作爲一個數組返回
findAll: function(iterator) {
var results = [];
this.each(function(value, index) {
if (iterator(value, index))
results.push(value);
});
return results;
},
//找到素有匹配pattern的枚舉元素,結果作爲數組返回,iterator可選,如果不指定舊返回素有匹配pattern的枚舉元素
grep: function(pattern, iterator) {//正則模式 迭代器
var results = [];
this.each(function(value, index) {
var stringValue = value.toString();
if (stringValue.match(pattern))
results.push((iterator || Prototype.K)(value, index));
})
return results;
},
//判斷枚舉對象中是否含有參數Object指定的值
include: function(object) {
var found = false;
this.each(function(value) {
if (value == object) {
found = true;
throw $break;
}
});
return found;
},
//將memo作爲iterator的第一個參數,枚舉元素作爲iterator的第二個參數,枚舉元素的次序作爲第三個
//參數每次迭代器的返回值將作爲下一個iterator的memo參數,從而所有的迭代執行都通過memo聯繫起來了
inject: function(memo, iterator) {
this.each(function(value, index) {
memo = iterator(memo, value, index);
});
return memo;
},
//對所有的枚舉元素執行method方法 後面是要傳遞的參數
invoke: function(method) {
var args = $A(arguments).slice(1);
return this.collect(function(value) {
return value[method].apply(value, args);
});
},
//返回的最大的迭代器執行結果
max: function(iterator) {
var result;
this.each(function(value, index) {
value = (iterator || Prototype.K)(value, index);
if (value >= (result || value))
result = value;
});
return result;
},
//反之
min: function(iterator) {
var result;
this.each(function(value, index) {
value = (iterator || Prototype.K)(value, index);
if (value <= (result || value))
result = value;
});
return result;
},
//返回兩個數組一組能使iterator返回true 另一組返回false
partition: function(iterator) {
var trues = [], falses = [];
this.each(function(value, index) {
((iterator || Prototype.K)(value, index) ?
trues : falses).push(value);
});
return [trues, falses];
},
//獲取所有枚舉元素的property屬性值作爲數組的返回
pluck: function(property) {
var results = [];
this.each(function(value, index) {
results.push(value[property]);
});
return results;
},
//與findall相反
reject: function(iterator) {
var results = [];
this.each(function(value, index) {
if (!iterator(value, index))
results.push(value);
});
return results;
},
//根據iterator的結果排序 最小的在前面 作爲數組返回
sortBy: function(iterator) {
return this.collect(function(value, index) {
return {value: value, criteria: iterator(value, index)};
}).sort(function(left, right) {
var a = left.criteria, b = right.criteria;
return a < b ? -1 : a > b ? 1 : 0;
}).pluck('value');
},
//枚舉對象--》數組
toArray: function() {
return this.collect(Prototype.K);
},
//接收多個枚舉對象參數,最後一個可以是迭代器用於陣列轉換
zip: function() {
var iterator = Prototype.K, args = $A(arguments);
if (typeof args.last() == 'function')
iterator = args.pop();
var collections = [this].concat(args).map($A);
return this.map(function(value, index) {
iterator(value = collections.pluck(index));
return value;
});
},
//返回枚舉對象的字符串描述
inspect: function() {
return '#<Enumerable:' + this.toArray().inspect() + '>';
}
}
//等價函數定義
Object.extend(Enumerable, {
map: Enumerable.collect,
find: Enumerable.detect,
select: Enumerable.findAll,
member: Enumerable.include,
entries: Enumerable.toArray
});
/*========================================================================================*/
//【Array】數組對象
//參數轉換爲數組,如果參數定義了toarray則直接調用,否則枚舉獲得數組
var $A = Array.from = function(iterable) {
if (!iterable) return [];
if (iterable.toArray) {
return iterable.toArray();
} else {
var results = [];
for (var i = 0; i < iterable.length; i++)
results.push(iterable[i]);
return results;
}
}
//數組對象繼承了Enumerable接口
Object.extend(Array.prototype, Enumerable);
Array.prototype._reverse = Array.prototype.reverse;
Object.extend(Array.prototype, {
//實現了枚舉接口方法,用於對數組內的元素執行迭代器
_each: function(iterator) {
for (var i = 0; i < this.length; i++)
iterator(this[i]);
},
//清空數組
clear: function() {
this.length = 0;
return this;
},
//取得第一個元素
first: function() {
return this[0];
},
//取得最後一個元素
last: function() {
return this[this.length - 1];
},
//刪除數組元素中所有的null undefined值 作爲新數組返回,原數組不受影響
compact: function() {
return this.select(function(value) {
return value != undefined || value != null;
});
},
//展開所有數組元素不再嵌套
flatten: function() {
return this.inject([], function(array, value) {
return array.concat(value.constructor == Array ?
value.flatten() : [value]);
});
},
//數組中刪除指定的元素,返回刪除後的結果,原數組不受影響
without: function() {
var values = $A(arguments);
return this.select(function(value) {
return !values.include(value);
});
},
//Value元素在數組中的索引值
indexOf: function(object) {
for (var i = 0; i < this.length; i++)
if (this[i] == object) return i;
return -1;
},
//反轉數組
reverse: function(inline) {
return (inline !== false ? this : this.toArray())._reverse();
},
//刪除數組中第一個元素並返回這個元素的值
shift: function() {
var result = this[0];
for (var i = 0; i < this.length - 1; i++)
this[i] = this[i + 1];
this.length--;
return result;
},
//得到數組的字符串描述例如arr=[1,2,3]-----> "[1,2,3]"
inspect: function() {
return '[' + this.map(Object.inspect).join(', ') + ']';
}
});
/*========================================================================================*/
//【Hash】哈希對象
var Hash = {
//實現枚舉接口方法從而使Hash對象也是枚舉對象
_each: function(iterator) {
for (key in this) {
var value = this[key];
if (typeof value == 'function') continue;
var pair = [key, value];
pair.key = key;
pair.value = value;
iterator(pair);
}
},
//所有鍵數組
keys: function() {
return this.pluck('key');
},
//所有值數組
values: function() {
return this.pluck('value');
},
//合併哈希表,鍵相同就覆蓋調用者
merge: function(hash) {
return $H(hash).inject($H(this), function(mergedHash, pair) {
mergedHash[pair.key] = pair.value;
return mergedHash;
});
},
//鍵值對組成查詢字符串的形式
toQueryString: function() {
return this.map(function(pair) {
return pair.map(encodeURIComponent).join('=');
}).join('&');
},
//獲取Hash對象的字符串描述
inspect: function() {
return '#<Hash:{' + this.map(function(pair) {
return pair.map(Object.inspect).join(': ');
}).join(', ') + '}>';
}
}
/*哈希表不是類而是對象所以不能用new的方法創建,而是用$H()函數
這個方法吧一個對象轉換爲哈希對象,對象的屬性名爲key 值爲value
可枚舉!!
*/
function $H(object) {
var hash = Object.extend({}, object || {});
Object.extend(hash, Enumerable);
Object.extend(hash, Hash);
return hash;
}
/*========================================================================================*/
//【ObjectRange】用於進行指定次數的循環運算,同樣繼承於枚舉接口並實現_each方法
//有了這個方法基本上Javascript裏面就不用for循環了
ObjectRange = Class.create();
Object.extend(ObjectRange.prototype, Enumerable);
Object.extend(ObjectRange.prototype, {
//構造函數同事指定了3個參數的值
initialize: function(start, end, exclusive) {
this.start = start; //其實索引
this.end = end;//結束索引
this.exclusive = exclusive;//表示是否包含結束索引
},
_each: function(iterator) {
var value = this.start;
do {
iterator(value);
value = value.succ();
} while (this.include(value));
},
//重寫枚舉接口的include方法,判斷改循環的索引是否包含參數value的指定的值
include: function(value) {
if (value < this.start)
return false;
if (this.exclusive)
return value < this.end;
return value <= this.end;
}
});
//使用$R()方法快速創建objectRange對象
var $R = function(start, end, exclusive) {
return new ObjectRange(start, end, exclusive);
}
/*========================================================================================*/
/* 【Ajax模塊】
/*========================================================================================*/
//【ajax對象】
var Ajax = {//創建瀏覽器兼容的XMLHttpRequest對象
getTransport: function() {
return Try.these(
function() {return new ActiveXObject('Msxml2.XMLHTTP')},
function() {return new ActiveXObject('Microsoft.XMLHTTP')},
function() {return new XMLHttpRequest()}
) || false;
},
//當前激活的請求數目
activeRequestCount: 0
}
//【Ajax.Responders對象】
Ajax.Responders = {
responders: [],//表示所有響應處理代理
_each: function(iterator) {
this.responders._each(iterator);
},
//註冊一個響應代理
register: function(responderToAdd) {
if (!this.include(responderToAdd))
this.responders.push(responderToAdd);
},
//刪除一個響應代理
unregister: function(responderToRemove) {
this.responders = this.responders.without(responderToRemove);
},
//分發一個回調函數,讓所有半酣callback回調函數事件標識符的響應代理都被調用
//傳遞三個參數最後一個可選表示Json對象
dispatch: function(callback, request, transport, json) {
this.each(function(responder) {
if (responder[callback] && typeof responder[callback] == 'function') {
try {
responder[callback].apply(responder, [request, transport, json]);
} catch (e) {}
}
});
}
};
Object.extend(Ajax.Responders, Enumerable);
//統計當前活動請求的數目
Ajax.Responders.register({
//開始創建了一個請求
onCreate: function() {
Ajax.activeRequestCount++;
},
//請求結束
onComplete: function() {
Ajax.activeRequestCount--;
}
});
//【Ajax.Base類】進行服務器通信的基類
Ajax.Base = function() {};
Ajax.Base.prototype = {
setOptions: function(options) {
this.options = {
method: 'post',
asynchronous: true,
parameters: ''
}
Object.extend(this.options, options || {});
},
responseIsSuccess: function() {
return this.transport.status == undefined
|| this.transport.status == 0
|| (this.transport.status >= 200 && this.transport.status < 300);
},
responseIsFailure: function() {
return !this.responseIsSuccess();
}
}
//【Ajax.Request類】用於向服務器端發送請求,封裝了XmlHttpRequest
Ajax.Request = Class.create();
Ajax.Request.Events =
['Uninitialized', 'Loading', 'Loaded', 'Interactive', 'Complete'];
Ajax.Request.prototype = Object.extend(new Ajax.Base(), {
initialize: function(url, options) {
this.transport = Ajax.getTransport();
this.setOptions(options);//使用基類方法設置
this.request(url);
},
//向指定url發送請求 一般不會顯示調用
request: function(url) {
var parameters = this.options.parameters || '';
if (parameters.length > 0) parameters += '&_=';
try {
this.url = url;
if (this.options.method == 'get' && parameters.length > 0)
this.url += (this.url.match(/?/) ? '&' : '?') + parameters;
Ajax.Responders.dispatch('onCreate', this, this.transport);
this.transport.open(this.options.method, this.url,
this.options.asynchronous);
if (this.options.asynchronous) {
this.transport.onreadystatechange = this.onStateChange.bind(this);
setTimeout((function() {this.respondToReadyState(1)}).bind(this), 10);
}
this.setRequestHeaders();
var body = this.options.postBody ? this.options.postBody : parameters;
this.transport.send(this.options.method == 'post' ? body : null);
} catch (e) {
this.dispatchException(e);
}
},
//設置請求的Http頭 類內部使用 一般無需顯示調用
setRequestHeaders: function() {
var requestHeaders =
['X-Requested-With', 'XMLHttpRequest',
'X-Prototype-Version', Prototype.Version];
if (this.options.method == 'post') {
requestHeaders.push('Content-type',
'application/x-www-form-urlencoded');
/* Force "Connection: close" for Mozilla browsers to work around
* a bug where XMLHttpReqeuest sends an incorrect Content-length
* header. See Mozilla Bugzilla #246651.
*/
if (this.transport.overrideMimeType)
requestHeaders.push('Connection', 'close');
}
if (this.options.requestHeaders)
requestHeaders.push.apply(requestHeaders, this.options.requestHeaders);
for (var i = 0; i < requestHeaders.length; i += 2)
this.transport.setRequestHeader(requestHeaders[i], requestHeaders[i+1]);
},
//檢測XMLHttpRquest對象的onstatechange事件類內部使用 一般無需顯示調用
onStateChange: function() {
var readyState = this.transport.readyState;
if (readyState != 1)
this.respondToReadyState(this.transport.readyState);
},
//獲取指定的Http頭的內容
header: function(name) {
try {
return this.transport.getResponseHeader(name);
} catch (e) {}
},
//如果服務器返回了Http頭"X-JOSN"則將其作爲js執行並返回執行結果
evalJSON: function() {
try {
return eval(this.header('X-JSON'));
} catch (e) {}
},
//將XMLHttpRequest返回的responseText作爲JS語句執行並返回執行結果
evalResponse: function() {
try {
return eval(this.transport.responseText);
} catch (e) {
this.dispatchException(e);
}
},
//處理XMLHttpRequest的readystate屬性根據成功或失敗調用Options對象中相應的回調函數
//同時通知Ajax.Responders中註冊的響應處理句柄
respondToReadyState: function(readyState) {
var event = Ajax.Request.Events[readyState];
var transport = this.transport, json = this.evalJSON();
if (event == 'Complete') {
try {
(this.options['on' + this.transport.status]
|| this.options['on' + (this.responseIsSuccess() ? 'Success' : 'Failure')]
|| Prototype.emptyFunction)(transport, json);
} catch (e) {
this.dispatchException(e);
}
if ((this.header('Content-type') || '').match(/^text/javascript/i))
this.evalResponse();
}
try {
(this.options['on' + event] || Prototype.emptyFunction)(transport, json);
Ajax.Responders.dispatch('on' + event, this, transport, json);
} catch (e) {
this.dispatchException(e);
}
/* Avoid memory leak in MSIE: clean up the oncomplete event handler */
if (event == 'Complete')
this.transport.onreadystatechange = Prototype.emptyFunction;
},
dispatchException: function(exception) {
(this.options.onException || Prototype.emptyFunction)(this, exception);
Ajax.Responders.dispatch('onException', this, exception);
}
});
/*========================================================================================*/
//【Ajax.Updater類】用於將獲取的內容填充到指定的容器中去
Ajax.Updater = Class.create();
Object.extend(Object.extend(Ajax.Updater.prototype, Ajax.Request.prototype), {
//重寫了構造函數
initialize: function(container, url, options) {
this.containers = {
success: container.success ? $(container.success) : $(container),
failure: container.failure ? $(container.failure) :
(container.success ? null : $(container))
}
this.transport = Ajax.getTransport();
this.setOptions(options);//可以指定evalscripts屬性和insertion屬性
var onComplete = this.options.onComplete || Prototype.emptyFunction;
this.options.onComplete = (function(transport, object) {
this.updateContent();
onComplete(transport, object);
}).bind(this);
this.request(url);
},
updateContent: function() {
var receiver = this.responseIsSuccess() ?
this.containers.success : this.containers.failure;
var response = this.transport.responseText;
if (!this.options.evalScripts)
response = response.stripScripts();
if (receiver) {
if (this.options.insertion) {
new this.options.insertion(receiver, response);
} else {
Element.update(receiver, response);
}
}
if (this.responseIsSuccess()) {
if (this.onComplete)
setTimeout(this.onComplete.bind(this), 10);
}
}
});
/*========================================================================================*/
//【Ajax.PeriodicalUpdater類】用於定時執行服務器異步調用,功能與Updater相同只是有了定時功能
Ajax.PeriodicalUpdater = Class.create();
Ajax.PeriodicalUpdater.prototype = Object.extend(new Ajax.Base(), {
initialize: function(container, url, options) {
this.setOptions(options);
this.onComplete = this.options.onComplete;
//區別就在下面兩個屬性 頻率 衰減參數 指數增長!只要有一次不同舊回覆原有頻率
this.frequency = (this.options.frequency || 2);
this.decay = (this.options.decay || 1);
this.updater = {};
this.container = container;
this.url = url;
this.start();
},
start: function() {
this.options.onComplete = this.updateComplete.bind(this);
this.onTimerEvent();
},
stop: function() {
this.updater.onComplete = undefined;
clearTimeout(this.timer);
(this.onComplete || Prototype.emptyFunction).apply(this, arguments);
},
updateComplete: function(request) {
if (this.options.decay) {
this.decay = (request.responseText == this.lastText ?
this.decay * this.options.decay : 1);
this.lastText = request.responseText;
}
this.timer = setTimeout(this.onTimerEvent.bind(this),
this.decay * this.frequency * 1000);
},
onTimerEvent: function() {
this.updater = new Ajax.Updater(this.container, this.url, this.options);
}
});
/*========================================================================================*/
/*【文檔操作的封裝】
/*========================================================================================*/
//返回了一個數組包含了所有符合條件的結點的引用
document.getElementsByClassName = function(className, parentElement) { //parentElement不指定就在全局查找
var children = ($(parentElement) || document.body).getElementsByTagName('*');
return $A(children).inject([], function(elements, child) {
if (child.className.match(new RegExp("(^|s)" + className + "(s|$)")))
elements.push(child);
return elements;
});
}
/*【Element對象】用於對文檔結點做一些統一的操作
*/
if (!window.Element) {
var Element = new Object();
}
Object.extend(Element, {
visible: function(element) {
return $(element).style.display != 'none';
},
//指定結點可見性的切換
toggle: function() {
for (var i = 0; i < arguments.length; i++) {
var element = $(arguments[i]);
Element[Element.visible(element) ? 'hide' : 'show'](element);
}
},
hide: function() {
for (var i = 0; i < arguments.length; i++) {
var element = $(arguments[i]);
element.style.display = 'none';
}
},
show: function() {
for (var i = 0; i < arguments.length; i++) {
var element = $(arguments[i]);
element.style.display = '';
}
},
remove: function(element) {
element = $(element);
element.parentNode.removeChild(element);
},
//將html片段填充到element指定的結點中
update: function(element, html) {
$(element).innerHTML = html.stripScripts();
setTimeout(function() {html.evalScripts()}, 10);
},
//獲得element的絕對高度
getHeight: function(element) {
element = $(element);
return element.offsetHeight;
},
classNames: function(element) {
return new Element.ClassNames(element);
},
hasClassName: function(element, className) {
if (!(element = $(element))) return;
return Element.classNames(element).include(className);
},
addClassName: function(element, className) {
if (!(element = $(element))) return;
return Element.classNames(element).add(className);
},
removeClassName: function(element, className) {
if (!(element = $(element))) return;
return Element.classNames(element).remove(className);
},
// removes whitespace-only text node children
cleanWhitespace: function(element) {
element = $(element);
for (var i = 0; i < element.childNodes.length; i++) {
var node = element.childNodes[i];
if (node.nodeType == 3 && !/S/.test(node.nodeValue))
Element.remove(node);
}
},
empty: function(element) {
return $(element).innerHTML.match(/^s*$/);
},
//將瀏覽器的滾動條滾動到指定的結點的位置
scrollTo: function(element) {
element = $(element);
var x = element.x ? element.x : element.offsetLeft,
y = element.y ? element.y : element.offsetTop;
window.scrollTo(x, y);
},
//得到element的結點的絕對樣式
getStyle: function(element, style) {
element = $(element);
var value = element.style[style.camelize()];
if (!value) {
if (document.defaultView && document.defaultView.getComputedStyle) {
var css = document.defaultView.getComputedStyle(element, null);
value = css ? css.getPropertyValue(style) : null;
} else if (element.currentStyle) {
value = element.currentStyle[style.camelize()];
}
}
if (window.opera && ['left', 'top', 'right', 'bottom'].include(style))
if (Element.getStyle(element, 'position') == 'static') value = 'auto';
return value == 'auto' ? null : value;
},
//設置結點樣式 var style={background-color:'black',color:'red'} Element.setStyle($('div1'),style)
setStyle: function(element, style) {
element = $(element);
for (name in style)
element.style[name.camelize()] = style[name];
},
//獲得結點的寬度高度 該方法無論結點是否可見 都能獲得其大小
getDimensions: function(element) {
element = $(element);
if (Element.getStyle(element, 'display') != 'none')
return {width: element.offsetWidth, height: element.offsetHeight};
// All *Width and *Height properties give 0 on elements with display none,
// so enable the element temporarily
var els = element.style;
var originalVisibility = els.visibility;
var originalPosition = els.position;
els.visibility = 'hidden';
els.position = 'absolute';
els.display = '';
var originalWidth = element.clientWidth;
var originalHeight = element.clientHeight;
els.display = 'none';
els.position = originalPosition;
els.visibility = originalVisibility;
return {width: originalWidth, height: originalHeight};
},
//相對定位
makePositioned: function(element) {
element = $(element);
var pos = Element.getStyle(element, 'position');
if (pos == 'static' || !pos) {
element._madePositioned = true;
element.style.position = 'relative';
// Opera returns the offset relative to the positioning context, when an
// element is position relative but top and left have not been defined
if (window.opera) {
element.style.top = 0;
element.style.left = 0;
}
}
},
//取消相對定位
undoPositioned: function(element) {
element = $(element);
if (element._madePositioned) {
element._madePositioned = undefined;
element.style.position =
element.style.top =
element.style.left =
element.style.bottom =
element.style.right = '';
}
},
//使結點隱藏超出的部分 overflow=relative
makeClipping: function(element) {
element = $(element);
if (element._overflow) return;
element._overflow = element.style.overflow;
if ((Element.getStyle(element, 'overflow') || 'visible') != 'hidden')
element.style.overflow = 'hidden';
},
undoClipping: function(element) {
element = $(element);
if (element._overflow) return;
element.style.overflow = element._overflow;
element._overflow = undefined;
}
});
/*========================================================================================*/
//Toggle對象是Element.toggle方法的一個快捷用法
var Toggle = new Object();
Toggle.display = Element.toggle;
/*========================================================================================*/
//【Insertion命名空間】包含了4個類把指定的html片段插入到指定的結點的相應位置上
Abstract.Insertion = function(adjacency) {
this.adjacency = adjacency;
}
Abstract.Insertion.prototype = {
initialize: function(element, content) {
this.element = $(element);
this.content = content.stripScripts();
if (this.adjacency && this.element.insertAdjacentHTML) {
try {
this.element.insertAdjacentHTML(this.adjacency, this.content);
} catch (e) {
if (this.element.tagName.toLowerCase() == 'tbody') {
this.insertContent(this.contentFromAnonymousTable());
} else {
throw e;
}
}
} else {
this.range = this.element.ownerDocument.createRange();
if (this.initializeRange) this.initializeRange();
this.insertContent([this.range.createContextualFragment(this.content)]);
}
setTimeout(function() {content.evalScripts()}, 10);
},
contentFromAnonymousTable: function() {
var div = document.createElement('div');
div.innerHTML = '<table><tbody>' + this.content + '</tbody></table>';
return $A(div.childNodes[0].childNodes[0].childNodes);
}
}
var Insertion = new Object();
Insertion.Before = Class.create();
Insertion.Before.prototype = Object.extend(new Abstract.Insertion('beforeBegin'), {
initializeRange: function() {
this.range.setStartBefore(this.element);
},
insertContent: function(fragments) {
fragments.each((function(fragment) {
this.element.parentNode.insertBefore(fragment, this.element);
}).bind(this));
}
});
Insertion.Top = Class.create();
Insertion.Top.prototype = Object.extend(new Abstract.Insertion('afterBegin'), {
initializeRange: function() {
this.range.selectNodeContents(this.element);
this.range.collapse(true);
},
insertContent: function(fragments) {
fragments.reverse(false).each((function(fragment) {
this.element.insertBefore(fragment, this.element.firstChild);
}).bind(this));
}
});
Insertion.Bottom = Class.create();
Insertion.Bottom.prototype = Object.extend(new Abstract.Insertion('beforeEnd'), {
initializeRange: function() {
this.range.selectNodeContents(this.element);
this.range.collapse(this.element);
},
insertContent: function(fragments) {
fragments.each((function(fragment) {
this.element.appendChild(fragment);
}).bind(this));
}
});
Insertion.After = Class.create();
Insertion.After.prototype = Object.extend(new Abstract.Insertion('afterEnd'), {
initializeRange: function() {
this.range.setStartAfter(this.element);
},
insertContent: function(fragments) {
fragments.each((function(fragment) {
this.element.parentNode.insertBefore(fragment,
this.element.nextSibling);
}).bind(this));
}
});
/*========================================================================================*/
//【Element.ClassNames】獲得一個結點的所有的class名稱組成的對象,實現了枚舉接口
Element.ClassNames = Class.create();
Element.ClassNames.prototype = {
initialize: function(element) {
this.element = $(element);
},
_each: function(iterator) {
this.element.className.split(/s+/).select(function(name) {
return name.length > 0;
})._each(iterator);
},
set: function(className) {
this.element.className = className;
},
add: function(classNameToAdd) {
if (this.include(classNameToAdd)) return;
this.set(this.toArray().concat(classNameToAdd).join(' '));
},
remove: function(classNameToRemove) {
if (!this.include(classNameToRemove)) return;
this.set(this.select(function(className) {
return className != classNameToRemove;
}).join(' '));
},
toString: function() {//獲得所有class的字符串表示空格隔開
return this.toArray().join(' ');
}
}
//表單域對象工具類
Object.extend(Element.ClassNames.prototype, Enumerable);
var Field = {
clear: function() {
for (var i = 0; i < arguments.length; i++)
$(arguments[i]).value = '';
},
focus: function(element) {
$(element).focus();
},
present: function() {
for (var i = 0; i < arguments.length; i++)
if ($(arguments[i]).value == '') return false;
return true;
},
//選中表單域
select: function(element) {
$(element).select();
},
//focus + select
activate: function(element) {
element = $(element);
element.focus();
if (element.select)
element.select();
}
}
/*【Form】表單工具對象*/
var Form = {
//表單數據序列化
serialize: function(form) {
var elements = Form.getElements($(form));
var queryComponents = new Array();
for (var i = 0; i < elements.length; i++) {
var queryComponent = Form.Element.serialize(elements[i]);
if (queryComponent)
queryComponents.push(queryComponent);
}
return queryComponents.join('&');
},
//獲取所有表單域按照標記名排列
getElements: function(form) {
form = $(form);
var elements = new Array();
for (tagName in Form.Element.Serializers) {
var tagElements = form.getElementsByTagName(tagName);
for (var j = 0; j < tagElements.length; j++)
elements.push(tagElements[j]);
}
return elements;
},
//有一個滿足就返回
getInputs: function(form, typeName, name) {
form = $(form);
var inputs = form.getElementsByTagName('input');
if (!typeName && !name)
return inputs;
var matchingInputs = new Array();
for (var i = 0; i < inputs.length; i++) {
var input = inputs[i];
if ((typeName && input.type != typeName) ||
(name && input.name != name))
continue;
matchingInputs.push(input);
}
return matchingInputs;
},
//整個表單域禁用
disable: function(form) {
var elements = Form.getElements(form);
for (var i = 0; i < elements.length; i++) {
var element = elements[i];
element.blur();
element.disabled = 'true';
}
},
//啓用
enable: function(form) {
var elements = Form.getElements(form);
for (var i = 0; i < elements.length; i++) {
var element = elements[i];
element.disabled = '';
}
},
//獲取第一個可用的表單域
findFirstElement: function(form) {
return Form.getElements(form).find(function(element) {
return element.type != 'hidden' && !element.disabled &&
['input', 'select', 'textarea'].include(element.tagName.toLowerCase());
});
},
//激活第一個表單域
focusFirstElement: function(form) {
Field.activate(Form.findFirstElement(form));
},
reset: function(form) {
$(form).reset();
}
}
//【Form.Element】 對特定的表單域進行操作
Form.Element = {
//序列化形成"&name=value"
serialize: function(element) {
element = $(element);
var method = element.tagName.toLowerCase();
var parameter = Form.Element.Serializers[method](element);
if (parameter) {
var key = encodeURIComponent(parameter[0]);
if (key.length == 0) return;
if (parameter[1].constructor != Array)
parameter[1] = [parameter[1]];
return parameter[1].map(function(value) {
return key + '=' + encodeURIComponent(value);
}).join('&');
}
},
//獲得指定表單域的值
getValue: function(element) {
element = $(element);
var method = element.tagName.toLowerCase();
var parameter = Form.Element.Serializers[method](element);
if (parameter)
return parameter[1];
}
}
//【Form.Element.Serializers】針對不同的表單域進行序列化
Form.Element.Serializers = {
//一般用所有的<input>標記的序列化都可以
input: function(element) {
switch (element.type.toLowerCase()) {
case 'submit':
case 'hidden':
case 'password':
case 'text':
return Form.Element.Serializers.textarea(element);
case 'checkbox':
case 'radio':
return Form.Element.Serializers.inputSelector(element);
}
return false;
},
inputSelector: function(element) {
if (element.checked)
return [element.name, element.value];
},
textarea: function(element) {
return [element.name, element.value];
},
select: function(element) {
return Form.Element.Serializers[element.type == 'select-one' ?
'selectOne' : 'selectMany'](element);
},
selectOne: function(element) {
var value = '', opt, index = element.selectedIndex;
if (index >= 0) {
opt = element.options[index];
value = opt.value;
if (!value && !('value' in opt))
value = opt.text;
}
return [element.name, value];
},
selectMany: function(element) {
var value = new Array();
for (var i = 0; i < element.length; i++) {
var opt = element.options[i];
if (opt.selected) {
var optValue = opt.value;
if (!optValue && !('value' in opt))
optValue = opt.text;
value.push(optValue);
}
}
return [element.name, value];
}
}
//【獲得表單域的值】
var $F = Form.Element.getValue;
/*========================================================================================*/
/*【Observer模式框架】 觀察對象僅僅針對表單和表單域*/
/*========================================================================================*/
Abstract.TimedObserver = function() {}//定義了基於定時器的觀察模式基類後面的類都繼承了這個類
Abstract.TimedObserver.prototype = {
initialize: function(element, frequency, callback) {
this.frequency = frequency;//觀察頻率
this.element = $(element);//被觀察的對象
this.callback = callback;//回調函數接受參數 被觀察對象自身和觸發事件時的值
this.lastValue = this.getValue();//這是觀察的值!!
this.registerCallback();
},
//註冊回調函數
registerCallback: function() {
setInterval(this.onTimerEvent.bind(this), this.frequency * 1000);
},
//每一個時間片觸發一次該事件
onTimerEvent: function() {
var value = this.getValue();
if (this.lastValue != value) {
this.callback(this.element, value);
this.lastValue = value;
}
}
}
//【Form.Element.Observer類】實現了getvalue方法
Form.Element.Observer = Class.create();
Form.Element.Observer.prototype = Object.extend(new Abstract.TimedObserver(), {
getValue: function() {
return Form.Element.getValue(this.element);
}
});
//【Form.Observer類】實現了getvalue方法,只要有一個表單域發生變化就會觸發回調
Form.Observer = Class.create();
Form.Observer.prototype = Object.extend(new Abstract.TimedObserver(), {
getValue: function() {
return Form.serialize(this.element);
}
});
//【Abstract.EventObserver 類】基於事件的Oberver模式的基類 後面的具體類都繼承這個類
Abstract.EventObserver = function() {}
Abstract.EventObserver.prototype = {
initialize: function(element, callback) {
this.element = $(element);
this.callback = callback;
this.lastValue = this.getValue();
if (this.element.tagName.toLowerCase() == 'form')
this.registerFormCallbacks();
else
this.registerCallback(this.element);
},
//每次發生事件時被調用 內部調用 無需顯示調用
onElementEvent: function() {
var value = this.getValue();
if (this.lastValue != value) {
this.callback(this.element, value);
this.lastValue = value;
}
},
//註冊表表單域事件
registerFormCallbacks: function() {
var elements = Form.getElements(this.element);
for (var i = 0; i < elements.length; i++)
this.registerCallback(elements[i]);
},
registerCallback: function(element) {
if (element.type) {
switch (element.type.toLowerCase()) {
case 'checkbox':
case 'radio':
Event.observe(element, 'click', this.onElementEvent.bind(this));
break;
case 'password':
case 'text':
case 'textarea':
case 'select-one':
case 'select-multiple':
Event.observe(element, 'change', this.onElementEvent.bind(this));
break;
}
}
}
}
//【Form.Element.EventObserver】
Form.Element.EventObserver = Class.create();
Form.Element.EventObserver.prototype = Object.extend(new Abstract.EventObserver(), {
getValue: function() {
return Form.Element.getValue(this.element);
}
});
//【Form.EventObserver】
Form.EventObserver = Class.create();
Form.EventObserver.prototype = Object.extend(new Abstract.EventObserver(), {
getValue: function() {
return Form.serialize(this.element);
}
});
/*========================================================================================*/
/*【事件處理:對Event對象的擴展】對javascript事件處理機制進行封裝*/
/*========================================================================================*/
if (!window.Event) {
var Event = new Object();
}
Object.extend(Event, {
KEY_BACKSPACE: 8,
KEY_TAB: 9,
KEY_RETURN: 13,
KEY_ESC: 27,
KEY_LEFT: 37,
KEY_UP: 38,
KEY_RIGHT: 39,
KEY_DOWN: 40,
KEY_DELETE: 46,
//獲取觸發事件的對象
element: function(event) {
return event.target || event.srcElement;
},
isLeftClick: function(event) {
return (((event.which) && (event.which == 1)) ||
((event.button) && (event.button == 1)));
},
pointerX: function(event) {
return event.pageX || (event.clientX +
(document.documentElement.scrollLeft || document.body.scrollLeft));
},
pointerY: function(event) {
return event.pageY || (event.clientY +
(document.documentElement.scrollTop || document.body.scrollTop));
},
//停止事件的傳遞
stop: function(event) {
if (event.preventDefault) {
event.preventDefault();
event.stopPropagation();
} else {
event.returnValue = false;
event.cancelBubble = true;
}
},
// find the first node with the given tagName, starting from the
// node the event was triggered on; traverses the DOM upwards
findElement: function(event, tagName) {
var element = Event.element(event);
while (element.parentNode && (!element.tagName ||
(element.tagName.toUpperCase() != tagName.toUpperCase())))
element = element.parentNode;
return element;
},
observers: false,
_observeAndCache: function(element, name, observer, useCapture) {
if (!this.observers) this.observers = [];
if (element.addEventListener) {
this.observers.push([element, name, observer, useCapture]);
element.addEventListener(name, observer, useCapture);
} else if (element.attachEvent) {
this.observers.push([element, name, observer, useCapture]);
element.attachEvent('on' + name, observer);
}
},
//刪除所有通過Event.observers綁定的事件
unloadCache: function() {
if (!Event.observers) return;
for (var i = 0; i < Event.observers.length; i++) {
Event.stopObserving.apply(this, Event.observers[i]);
Event.observers[i][0] = null;
}
Event.observers = false;
},
//綁定一個事件
observe: function(element, name, observer, useCapture) {
var element = $(element);
useCapture = useCapture || false;
if (name == 'keypress' &&
(navigator.appVersion.match(/Konqueror|Safari|KHTML/)
|| element.attachEvent))
name = 'keydown';
this._observeAndCache(element, name, observer, useCapture);
},
//取消事件綁定
stopObserving: function(element, name, observer, useCapture) {
var element = $(element);
useCapture = useCapture || false;
if (name == 'keypress' &&
(navigator.appVersion.match(/Konqueror|Safari|KHTML/)
|| element.detachEvent))
name = 'keydown';
if (element.removeEventListener) {
element.removeEventListener(name, observer, useCapture);
} else if (element.detachEvent) {
element.detachEvent('on' + name, observer);
}
}
});
//【結點的位置處理:Position對象】
/* prevent memory leaks in IE */
Event.observe(window, 'unload', Event.unloadCache, false);
var Position = {
// set to true if needed, warning: firefox performance problems
// NOT neeeded for page scrolling, only if draggable contained in
// scrollable elements
includeScrollOffsets: false,
// must be called before calling withinIncludingScrolloffset, every time the
// page is scrolled用於計算滾動條的位置信息
prepare: function() {
this.deltaX = window.pageXOffset
|| document.documentElement.scrollLeft
|| document.body.scrollLeft
|| 0;
this.deltaY = window.pageYOffset
|| document.documentElement.scrollTop
|| document.body.scrollTop
|| 0;
},
//計算節點的絕對滾動位置返回包含兩個元素的數組到文檔左側 頂部的距離
realOffset: function(element) {
var valueT = 0, valueL = 0;
do {
valueT += element.scrollTop || 0;
valueL += element.scrollLeft || 0;
element = element.parentNode;
} while (element);
return [valueL, valueT];
},
//計算結點相對於文檔的絕對滾動位置,返回包含兩個元素的數組到文檔左側 頂部的距離
cumulativeOffset: function(element) {
var valueT = 0, valueL = 0;
do {
valueT += element.offsetTop || 0;
valueL += element.offsetLeft || 0;
element = element.offsetParent;
} while (element);
return [valueL, valueT];
},
//相對位置
positionedOffset: function(element) {
var valueT = 0, valueL = 0;
do {
valueT += element.offsetTop || 0;
valueL += element.offsetLeft || 0;
element = element.offsetParent;
if (element) {
p = Element.getStyle(element, 'position');
if (p == 'relative' || p == 'absolute') break;
}
} while (element);
return [valueL, valueT];
},
offsetParent: function(element) {
if (element.offsetParent) return element.offsetParent;
if (element == document.body) return element;
while ((element = element.parentNode) && element != document.body)
if (Element.getStyle(element, 'position') != 'static')
return element;
return document.body;
},
// caches x/y coordinate pair to use with overlap是否在element內
within: function(element, x, y) {
if (this.includeScrollOffsets)
return this.withinIncludingScrolloffsets(element, x, y);
this.xcomp = x;
this.ycomp = y;
this.offset = this.cumulativeOffset(element);
return (y >= this.offset[1] &&
y < this.offset[1] + element.offsetHeight &&
x >= this.offset[0] &&
x < this.offset[0] + element.offsetWidth);
},
withinIncludingScrolloffsets: function(element, x, y) {
var offsetcache = this.realOffset(element);
this.xcomp = x + offsetcache[0] - this.deltaX;
this.ycomp = y + offsetcache[1] - this.deltaY;
this.offset = this.cumulativeOffset(element);
return (this.ycomp >= this.offset[1] &&
this.ycomp < this.offset[1] + element.offsetHeight &&
this.xcomp >= this.offset[0] &&
this.xcomp < this.offset[0] + element.offsetWidth);
},
// within must be called directly before
overlap: function(mode, element) {
if (!mode) return 0;
if (mode == 'vertical')
return ((this.offset[1] + element.offsetHeight) - this.ycomp) /
element.offsetHeight;
if (mode == 'horizontal')
return ((this.offset[0] + element.offsetWidth) - this.xcomp) /
element.offsetWidth;
},
//克隆結點 常用於拖放
clone: function(source, target) {
source = $(source);
target = $(target);
target.style.position = 'absolute';
var offsets = this.cumulativeOffset(source);
target.style.top = offsets[1] + 'px';
target.style.left = offsets[0] + 'px';
target.style.width = source.offsetWidth + 'px';
target.style.height = source.offsetHeight + 'px';
},
page: function(forElement) {
var valueT = 0, valueL = 0;
var element = forElement;
do {
valueT += element.offsetTop || 0;
valueL += element.offsetLeft || 0;
// Safari fix
if (element.offsetParent==document.body)
if (Element.getStyle(element,'position')=='absolute') break;
} while (element = element.offsetParent);
element = forElement;
do {
valueT -= element.scrollTop || 0;
valueL -= element.scrollLeft || 0;
} while (element = element.parentNode);
return [valueL, valueT];
},
clone: function(source, target) {
var options = Object.extend({
setLeft: true,
setTop: true,
setWidth: true,
setHeight: true,
offsetTop: 0,
offsetLeft: 0
}, arguments[2] || {})
// find page position of source
source = $(source);
var p = Position.page(source);
// find coordinate system to use
target = $(target);
var delta = [0, 0];
var parent = null;
// delta [0,0] will do fine with position: fixed elements,
// position:absolute needs offsetParent deltas
if (Element.getStyle(target,'position') == 'absolute') {
parent = Position.offsetParent(target);
delta = Position.page(parent);
}
// correct by body offsets (fixes Safari)
if (parent == document.body) {
delta[0] -= document.body.offsetLeft;
delta[1] -= document.body.offsetTop;
}
// set position
if(options.setLeft) target.style.left = (p[0] - delta[0] + options.offsetLeft) + 'px';
if(options.setTop) target.style.top = (p[1] - delta[1] + options.offsetTop) + 'px';
if(options.setWidth) target.style.width = source.offsetWidth + 'px';
if(options.setHeight) target.style.height = source.offsetHeight + 'px';
},
//絕對定位
absolutize: function(element) {
element = $(element);
if (element.style.position == 'absolute') return;
Position.prepare();
var offsets = Position.positionedOffset(element);
var top = offsets[1];
var left = offsets[0];
var width = element.clientWidth;
var height = element.clientHeight;
element._originalLeft = left - parseFloat(element.style.left || 0);
element._originalTop = top - parseFloat(element.style.top || 0);
element._originalWidth = element.style.width;
element._originalHeight = element.style.height;
element.style.position = 'absolute';
element.style.top = top + 'px';;
element.style.left = left + 'px';;
element.style.width = width + 'px';;
element.style.height = height + 'px';;
},
//相對定位
relativize: function(element) {
element = $(element);
if (element.style.position == 'relative') return;
Position.prepare();
element.style.position = 'relative';
var top = parseFloat(element.style.top || 0) - (element._originalTop || 0);
var left = parseFloat(element.style.left || 0) - (element._originalLeft || 0);
element.style.top = top + 'px';
element.style.left = left + 'px';
element.style.height = element._originalHeight;
element.style.width = element._originalWidth;
}
}
// Safari returns margins on body which is incorrect if the child is absolutely
// positioned. For performance reasons, redefine Position.cumulativeOffset for
// KHTML/WebKit only.
if (/Konqueror|Safari|KHTML/.test(navigator.userAgent)) {
Position.cumulativeOffset = function(element) {
var valueT = 0, valueL = 0;
do {
valueT += element.offsetTop || 0;
valueL += element.offsetLeft || 0;
if (element.offsetParent == document.body)
if (Element.getStyle(element, 'position') == 'absolute') break;
element = element.offsetParent;
} while (element);
return [valueL, valueT];
}
}
//--------->完成
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