JavaScript - JSLoader.js

原創

crazycode_1985

2020-02-21 00:39

/**
* js動態加載器
* @class ScriptLoader.prototype
* @extends Ext.Window
* @author nb
* @version 20110812
*/

ScriptLoader = function() {
this.timeout = 30;
this.scripts = [];
this.disableCaching = false;
this.loadMask = null;
};
ScriptLoader.prototype = {
showMask : function() {
if (!this.loadMask) {
   this.loadMask = new Ext.LoadMask(Ext.getBody());
   this.loadMask.show();
}
},
hideMask : function() {
if (this.loadMask) {
   this.loadMask.hide();
   this.loadMask = null;
}
},
processSuccess : function(response) {
this.scripts[response.argument.url] = true;
window.execScript ? window.execScript(response.responseText) : window
    .eval(response.responseText);
if (response.argument.options.scripts.length == 0) {
   this.hideMask();
}
if (typeof response.argument.callback == 'function') {
   response.argument.callback.call(response.argument.scope);
}
},
processFailure : function(response) {
this.hideMask();
Ext.MessageBox.show( {
   title : '提示',
   msg : '抱歉,加載失敗! 錯誤代碼:#1527',
   closable : false,
   icon : Ext.MessageBox.ERROR,
   minWidth : 200
});
setTimeout(function() {
   Ext.MessageBox.hide();
}, 3000);
},
load : function(url, callback) {
var cfg, callerScope;
if (typeof url == 'object') { // must be config object
cfg = url;
url = cfg.url;
callback = callback || cfg.callback;
callerScope = cfg.scope;
if (typeof cfg.timeout != 'undefined') {
   this.timeout = cfg.timeout;
}
if (typeof cfg.disableCaching != 'undefined') {
   this.disableCaching = cfg.disableCaching;
}
}
if (this.scripts[url]) {
if (typeof callback == 'function') {
   callback.call(callerScope || window);
}
return null;
}
this.showMask();
Ext.Ajax.request( {
url : url,
success : this.processSuccess,
failure : this.processFailure,
scope : this,
timeout : (this.timeout * 1000),
disableCaching : this.disableCaching,
argument : {
   'url' : url,
   'scope' : callerScope || window,
   'callback' : callback,
   'options' : cfg
}
});
}
};

ScriptLoaderMgr = function() {
this.loader = new ScriptLoader();
this.load = function(o) {
if (!Ext.isArray(o.scripts)) {
   o.scripts = [ o.scripts ];
}
o.url = o.scripts.shift();
if (o.scripts.length == 0) {
   this.loader.load(o);
} else {
   o.scope = this;
   this.loader.load(o, function() {
    this.load(o);
   });
}
};
};

JSLoader = new ScriptLoaderMgr();

//使用方式
//JSLoader.load({
//    scripts: ["1.js", "2.js", "3.js"], //地址數據,用到幾個傳幾個地址
//    callback: function() {
// //加載成功後的一系列操作,此函數可以去除
//    }
//});