JQuery插件第十七个: 改编网上流行的针对IE6下PNG图片透明插件

/**
 * --------------------------------------------------------------------
 * jQuery-Plugin "pngFix"
 * Version: 1.1, 11.09.2007
 * by Andreas Eberhard, [email protected]
 *                      http://jquery.andreaseberhard.de/
 *
 * Copyright (c) 2007 Andreas Eberhard
 * Licensed under GPL (http://www.opensource.org/licenses/gpl-license.php)
 *
 * Changelog:
 *    11.09.2007 Version 1.1
 *    - removed noConflict
 *    - added png-support for input type=image
 *    - 01.08.2007 CSS background-image support extension added by Scott Jehl, [email protected], http://www.filamentgroup.com
 *    31.05.2007 initial Version 1.0
 * --------------------------------------------------------------------
 * @example $(function(){$(document).pngFix();});
 * @desc Fixes all PNG's in the document on document.ready
 *
 * jQuery(function(){jQuery(document).pngFix();});
 * @desc Fixes all PNG's in the document on document.ready when using noConflict
 *
 * @example $(function(){$('div.examples').pngFix();});
 * @desc Fixes all PNG's within div with class examples
 *
 * @example $(function(){$('div.examples').pngFix( { blankgif:'ext.gif' } );});
 * @desc Fixes all PNG's within div with class examples, provides blank gif for input with png
 * --------------------------------------------------------------------
 */

(function($) {
jQuery.fn.pngFix = function(settings) {

	// Settings
	settings = jQuery.extend({
		blankgif: 'blank.gif' //此处是全透明的小图片，配合热区效果
	}, settings);

	var ie55 = (navigator.appName == "Microsoft Internet Explorer" && parseInt(navigator.appVersion) == 4 && navigator.appVersion.indexOf("MSIE 5.5") != -1);
	var ie6 = (navigator.appName == "Microsoft Internet Explorer" && parseInt(navigator.appVersion) == 4 && navigator.appVersion.indexOf("MSIE 6.0") != -1);

	if (jQuery.browser.msie && (ie55 || ie6)) {
		//fix images with png-source
		jQuery(this).find("img[src$='.png']").each(function() {
			var Img = this,img=jQuery(this);
			var id=new Date().getTime();var ImgID='id="' +id+ '" ';
			var ImgClass = (Img.className) ? "class='" + Img.className + "' " : "";
			var ImgTitle = (Img.title) ? "title='" + Img.title + "' " : "title='" +img.attr('alt') + "' "
			var ImgStyle = "display:inline-block;" + Img.style.cssText
			if (Img.align == "left") ImgStyle = "float:left;" + ImgStyle
			if (Img.align == "right") ImgStyle = "float:right;" + ImgStyle
			if (Img.parentElement.href) ImgStyle = "cursor:hand;" + ImgStyle
			var ImgUsemap=(img.attr('usemap'))? ' usemap="' + img.attr('usemap') + '" ' : '';	
			var strNewHTML = "<span " + ImgID + ImgClass + ImgTitle
			+ " style=\"" + "width:" + Img.width + "px; height:" + Img.height + "px;" + ImgStyle + ";"
			+ "filter:progid:DXImageTransform.Microsoft.AlphaImageLoader"
			+ "(src=\'" + Img.src + "\', sizingMethod='scale');\"><img src=\'"+settings.blankgif+"\' width=" + Img.width + " height=" + Img.height +ImgUsemap+"  /></span>";
			img.hide();
		    img.after(strNewHTML);
			var eventStr="click|mousedown|mouseenter|mouseleave|mousemove|mouseout|mouseover|mouseup|dblclick|blur|focus";
            var events = eventStr.split("|");
            var len=events.length;
            for (i = 0; i < len; i++) {
				var type=events[i];if(img.attr("on"+type)!=undefined)$("#"+id).bind(type,function(type){ img.trigger(type);});
            }
		});

		// fix css background pngs
		jQuery(this).find("*").each(function(){
			var bgIMG = jQuery(this).css('background-image');
			if(bgIMG.indexOf(".png")!=-1){
				var iebg = bgIMG.split('url("')[1].split('")')[0];
				jQuery(this).css('background-image', 'none');
				jQuery(this).get(0).runtimeStyle.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='" + iebg + "',sizingMethod='scale')";
			}
		});
		
		//fix input with png-source
		jQuery(this).find("input[src$='.png']").each(function() {
			var bgIMG = jQuery(this).attr('src');
			jQuery(this).get(0).runtimeStyle.filter = 'progid:DXImageTransform.Microsoft.AlphaImageLoader' + '(src=\'' + bgIMG + '\', sizingMethod=\'scale\');';
   		    jQuery(this).attr('src', settings.blankgif);
		});
	
	}
	
	return jQuery;

};

})(jQuery);