演示

源代码

Function.prototype.binding = function() {if (arguments.length < 2 && typeof arguments[0] == "undefined") return this;var __method = this, args = jQuery.makeArray(arguments), object = args.shift();return function() {return __method.apply(object, args.concat(jQuery.makeArray(arguments)));}
}var Class = function(subclass){subclass.setOptions = function(options){this.options = jQuery.extend({}, this.options,options);for(var key in options){if(/^on[A-Z][A-Za-z]*$/.test(key)){$(this).bind(key,options[key]);}}}var fn =  function(){if(subclass._init && typeof subclass._init == 'function'){this._init.apply(this,arguments);}}if(typeof subclass == 'object'){fn.prototype = subclass;}return fn;
}var PopupLayer = new Class({options:{trigger:null,                            //触发的元素或id,必填参数popupBlk:null,                           //弹出内容层元素或id,必填参数closeBtn:null,                           //关闭弹出层的元素或idpopupLayerClass:"popupLayer",            //弹出层容器的class名称eventType:"click",                       //触发事件的类型offsets:{                                //弹出层容器位置的调整值x:0,y:0},useFx:false,                             //是否使用特效useOverlay:false,                        //是否使用全局遮罩usePopupIframe:true,                     //是否使用容器遮罩isresize:true,                           //是否绑定window对象的resize事件onBeforeStart:function(){}            //自定义事件},_init:function(options){this.setOptions(options);                //载入设置this.isSetPosition = this.isDoPopup = this.isOverlay = true;    //定义一些开关this.popupLayer = $(document.createElement("div")).addClass(this.options.popupLayerClass);     //初始化最外层容器this.popupIframe = $(document.createElement("iframe")).attr({border:0,frameborder:0});         //容器遮罩,用于屏蔽ie6下的selectthis.trigger = $(this.options.trigger);                         //把触发元素封装成实例的一个属性，方便使用及理解this.popupBlk = $(this.options.popupBlk);                       //把弹出内容层元素封装成实例的一个属性this.closeBtn = $(this.options.closeBtn);                       //把关闭按钮素封装成实例的一个属性$(this).trigger("onBeforeStart");                               //执行自定义事件。this._construct()                                               //通过弹出内容层，构造弹出层，即为其添加外层容器及底层iframethis.trigger.bind(this.options.eventType,function(){            //给触发元素绑定触发事件if(this.isSetPosition){this.setPosition(this.trigger.offset().left + this.options.offsets.x, this.trigger.offset().top + this.trigger.get(0).offsetHeight + this.options.offsets.y);}this.options.useOverlay?this._loadOverlay():null;               //如果使用遮罩则加载遮罩元素(this.isOverlay && this.options.useOverlay)?this.overlay.show():null;if(this.isDoPopup && (this.popupLayer.css("display")== "none")){this.options.useFx?this.doEffects("open"):this.popupLayer.show();}							 }.binding(this));this.isresize?$(window).bind("resize",this.doresize.binding(this)):null;this.options.closeBtn?this.closeBtn.bind("click",this.close.binding(this)):null;   //如果有关闭按钮，则给关闭按钮绑定关闭事件},_construct:function(){                  //构造弹出层this.popupBlk.show();this.popupLayer.append(this.popupBlk.css({opacity:1})).appendTo($(document.body)).css({position:"absolute",'z-index':2,width:this.popupBlk.get(0).offsetWidth,height:this.popupBlk.get(0).offsetHeight});this.options.usePopupIframe?this.popupLayer.append(this.popupIframe):null;this.recalculatePopupIframe();this.popupLayer.hide();},_loadOverlay:function(){                //加载遮罩pageWidth = ($.browser.version=="6.0")?$(document).width()-21:$(document).width();this.overlay?this.overlay.remove():null;this.overlay = $(document.createElement("div"));this.overlay.css({position:"absolute","z-index":1,left:0,top:0,zoom:1,display:"none",width:pageWidth,height:$(document).height()}).appendTo($(document.body)).append("<div style='position:absolute;z-index:2;width:100%;height:100%;left:0;top:0;opacity:0.3;filter:Alpha(opacity=30);background:#000'></div><iframe frameborder='0' border='0' style='width:100%;height:100%;position:absolute;z-index:1;left:0;top:0;filter:Alpha(opacity=0);'></iframe>")},doresize:function(){this.overlay?this.overlay.css({width:($.browser.version=="6.0")?$(document).width()-21:$(document).width(),height:($.browser.version=="6.0")?$(document).height()-4:$(document).height()}):null;if(this.isSetPosition){this.setPosition(this.trigger.offset().left + this.options.offsets.x, this.trigger.offset().top + this.trigger.get(0).offsetHeight + this.options.offsets.y);}},setPosition:function(left,top){          //通过传入的参数值改变弹出层的位置this.popupLayer.css({left:left,top:top});},doEffects:function(way){                //做特效way == "open"?this.popupLayer.show("slow"):this.popupLayer.hide("slow");},recalculatePopupIframe:function(){     //重绘popupIframe,这个不知怎么改进，只好先用这个笨办法。this.popupIframe.css({position:"absolute",'z-index':-1,left:0,top:0,opacity:0,width:this.popupBlk.get(0).offsetWidth,height:this.popupBlk.get(0).offsetHeight});},close:function(){                      //关闭方法this.options.useOverlay?this.overlay.hide():null;this.options.useFx?this.doEffects("close"):this.popupLayer.hide();}
});