有時我們需要打印頁面中的某一區域的內容，比如只打印頁面中的表格部分，其他如頁頭和頁腳都不需要打印。解決辦法有多種，本文只探討使用CSS和jQuery實現的方法。
CSS控制頁面打印區域
使用CSS控制打印樣式，需要設置樣式media="print"，並且將頁面中不需要打印的元素的樣式display屬性設置爲none。如DEMO中，我將頁頭頁腳及其他不需要打印的元素的樣式設置如下：
<style
type
="text
/css
" media
="print
">
#header
,.top_title
,#jqprint
,#footer
,#cssprint
h3
{display:
none
}
</style
>
http://www.helloweba.com/demo/print/
jQuery控制頁面打印區域
這裏我要給大家介紹一個jQuery打印插件printArea.js。該插件使用簡單，可以實現控制打印頁面中指定的區域。
DEMO中有這樣一段代碼：
<p
>
<a
href
="#"
id
="print_btn"
>
點擊這裏打印>></a>
</p>
<div
id
="my_area"
>
...打印區域...<br
/>
</div>
我們需要打印ID爲my_area的DIV區域，只需要加入以下代碼：
$(function
(){
$("#print_btn"
).click(function
(){
$("#my_area"
).printArea();
}
);
}
);
當單擊打印按鈕時，調用件printArea.js插件。該插件還提供了一些參數可配置，使用方法：$(element).printArea(option)。
參數設置：
1、mode：模式，當點擊打印按鈕時觸發模式，默認爲iframe，當設置爲popup則會新開一個窗口頁面打印。
2、popTitle：設置新開窗口的標題，默認爲空。
3、popClose：完成打印後是否關閉窗口，默認爲false。
PS：IE瀏覽器打印頁面取出頁眉頁腳網址的方法：文件->頁面設置，將頁面和頁腳的輸入框清空即可。
/**
* Version 2.1
* -Contributors: "mindinquiring" : filter to exclude any stylesheet other than print.
* Tested ONLY in IE 8 and FF 3.6. No official support for other browsers, but will
* TRY to accomodate challenges in other browsers.
* Example:
* Print Button: <div id="print_button">Print</div>
* Print Area : <div class="PrintArea"> ... html ... </div>
* Javascript : <script>
* $("div#print_button").click(function(){
* $("div.PrintArea").printArea( [OPTIONS] );
* });
* </script>
* options are passed as json (json example: {mode: "popup", popClose: false})
*
* {OPTIONS} | [type] | (default), values | Explanation
* --------- | --------- | ---------------------- | -----------
* @mode | [string] | ("iframe"),"popup" | printable window is either iframe or browser popup
* @popHt | [number] | (500) | popup window height
* @popWd | [number] | (400) | popup window width
* @popX | [number] | (500) | popup window screen X position
* @popY | [number] | (500) | popup window screen Y position
* @popTitle | [string] | ('') | popup window title element
* @popClose | [boolean] | (false),true | popup window close after printing
* @strict | [boolean] | (undefined),true,false | strict or loose(Transitional) html 4.01 document standard or undefined to not include at all (only for popup option)
*/
(function($) {
var counter = 0;
var modes = { iframe : "iframe", popup : "popup" };
var defaults = { mode : modes.iframe,
popHt : 500,
popWd : 400,
popX : 200,
popY : 200,
popTitle : '',
popClose : false };
var settings = {};//global settings
$.fn.printArea = function( options )
{
$.extend( settings, defaults, options );
counter++;
var idPrefix = "printArea_";
$( "[id^=" + idPrefix + "]" ).remove();
var ele = getFormData( $(this) );
settings.id = idPrefix + counter;
var writeDoc;
var printWindow;
switch ( settings.mode )
{
case modes.iframe :
var f = new Iframe();
writeDoc = f.doc;
printWindow = f.contentWindow || f;
break;
case modes.popup :
printWindow = new Popup();
writeDoc = printWindow.doc;
}
writeDoc.open();
writeDoc.write( docType() + "<html>" + getHead() + getBody(ele) + "</html>" );
writeDoc.close();
printWindow.focus();
printWindow.print();
if ( settings.mode == modes.popup && settings.popClose )
printWindow.close();
}
function docType()
{
if ( settings.mode == modes.iframe || !settings.strict ) return "";
var standard = settings.strict == false ? " Trasitional" : "";
var dtd = settings.strict == false ? "loose" : "strict";
return '<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01' + standard + '//EN" "http://www.w3.org/TR/html4/' + dtd + '.dtd">';
}
function getHead()
{
var head = "<head><title>" + settings.popTitle + "</title>";
$(document).find("link")
.filter(function(){
return $(this).attr("rel").toLowerCase() == "stylesheet";
})
.filter(function(){ // this filter contributed by "mindinquiring"
var media = $(this).attr("media");
return (media.toLowerCase() == "" || media.toLowerCase() == "print")
})
.each(function(){
head += '<link type="text/css" rel="stylesheet" href="' + $(this).attr("href") + '" >';
});
head += "</head>";
return head;
}
function getBody( printElement )
{
return '<body><div class="' + $(printElement).attr("class") + '">' + $(printElement).html() + '</div></body>';
}
function getFormData( ele )
{
$("input,select,textarea", ele).each(function(){
// In cases where radio, checkboxes and select elements are selected and deselected, and the print
// button is pressed between select/deselect, the print screen shows incorrectly selected elements.
// To ensure that the correct inputs are selected, when eventually printed, we must inspect each dom element
var type = $(this).attr("type");
if ( type == "radio" || type == "checkbox" )
{
if ( $(this).is(":not(:checked)") ) this.removeAttribute("checked");
else this.setAttribute( "checked", true );
}
else if ( type == "text" )
this.setAttribute( "value", $(this).val() );
else if ( type == "select-multiple" || type == "select-one" )
$(this).find( "option" ).each( function() {
if ( $(this).is(":not(:selected)") ) this.removeAttribute("selected");
else this.setAttribute( "selected", true );
});
else if ( type == "textarea" )
{
var v = $(this).attr( "value" );
if ($.browser.mozilla)
{
if (this.firstChild) this.firstChild.textContent = v;
else this.textContent = v;
}
else this.innerHTML = v;
}
});
return ele;
}
function Iframe()
{
var frameId = settings.id;
var iframeStyle = 'border:0;position:absolute;width:0px;height:0px;left:0px;top:0px;';
var iframe;
try
{
iframe = document.createElement('iframe');
document.body.appendChild(iframe);
$(iframe).attr({ style: iframeStyle, id: frameId, src: "" });
iframe.doc = null;
iframe.doc = iframe.contentDocument ? iframe.contentDocument : ( iframe.contentWindow ? iframe.contentWindow.document : iframe.document);
}
catch( e ) { throw e + ". iframes may not be supported in this browser."; }
if ( iframe.doc == null ) throw "Cannot find document.";
return iframe;
}
function Popup()
{
var windowAttr = "location=yes,statusbar=no,directories=no,menubar=no,titlebar=no,toolbar=no,dependent=no";
windowAttr += ",width=" + settings.popWd + ",height=" + settings.popHt;
windowAttr += ",resizable=yes,screenX=" + settings.popX + ",screenY=" + settings.popY + ",personalbar=no,scrollbars=no";
var newWin = window.open( "", "_blank", windowAttr );
newWin.doc = newWin.document;
return newWin;
}
})(jQuery);