Real天下::码农频道

研究了一下baidu空间的popup.js(http://hi.baidu.com/js/popup.js)，发现还挺方便，没准哪天自己的项目能用的上。于是，顺手搬一棵前人种好的树过来乘一下凉。兼除一下blog上的杂草，毕竟一个多月没有说话了~最后呐喊一声：ChenReal还活着！

代码分析

var Popup=new Class();

Popup.prototype={
//弹出窗口中框架的name名称
iframeIdName:'ifr_popup',

initialize:function (config)
{
       //---------------弹出对话框的配置信息------------------
       //contentType:设置内容区域为什么类型：1为另外一个html文件 | 2为自定义html字符串 | 3为confirm对话框 | 4为alert警告对话框
       //isHaveTitle:是否显示标题栏
       //scrollType：设置或获取对话框中的框架是否可被滚动
       //isBackgroundCanClick：弹出对话框后，是否允许蒙布后的所有元素被点击。也就是如果为false的话，就会有全屏蒙布，如果为true的话，就会去掉全屏蒙布
       //isSupportDraging：是否支持拖拽
       //isShowShadow：是否现实阴影
       //isReloadOnClose：是否刷新页面，并关闭对话框
       //width：宽度
       //height：高度
       this.config=Object.extend({contentType:1,isHaveTitle:true, scrollType:'yes',isBackgroundCanClick:false,isSupportDraging:true, isShowShadow:true,isReloadOnClose:true,width:400,height:300}, config||{});

       //----------------对话框的参数值信息------------------------
       //shadowWidth    ：阴影的宽度
       //contentUrl     ：html链接页面
       //contentHtml    ：html内容
       //callBack      ：回调的函数名
       //parameter      ：回调的函数名中传的参数
       //confirmCon     ：对话框内容
       //alertCon      ：警告框内容
       //someHiddenTag：页面中需要隐藏的元素列表，以逗号分割
       //someHiddenEle：需要隐藏的元素的ID列表(和someToHidden的区别是：someHiddenEle是通过 getElementById，而someToHidden是通过getElementByTagName，里面放的是对象)
       //overlay      ：
       //coverOpacity ：蒙布的透明值
       this.info={shadowWidth:4,title:"",contentUrl:"",contentHtml:"", callBack:null,parameter:null,confirmCon:"",alertCon:"", someHiddenTag:"select,object,embed",someHiddenEle:"", overlay:0,coverOpacity:40};

//设置颜色cColor:蒙布的背景, bColor:内容区域的背景, tColor:标题栏和边框的颜色,wColor:字体的背景色
this.color={cColor:"#EEEEEE",bColor:"#FFFFFF",tColor:"#709CD2",wColor:"#FFFFFF"};

this.dropClass=null;

//用来放置隐藏了的对象列表，在hiddenTag方法中第一次调用
this.someToHidden=[];

       //如果没有标题栏则不支持拖拽
       if(!this.config.isHaveTitle)
       {
    this.config.isSupportDraging=false;
       }
       //初始化
       this.iniBuild();
},

//设置配置信息和参数内容
setContent:function (arrt,val)
{
       if(val!='')
       {
    switch(arrt)
    {
        case 'width':this.config.width=val;
        break;
        case 'height':this.config.height=val;
        break;
        case 'title':this.info.title=val;
        break;
        case 'contentUrl':this.info.contentUrl=val;
        break;
        case 'contentHtml':this.info.contentHtml=val;
        break;
        case 'callBack':this.info.callBack=val;
        break;
        case 'parameter':this.info.parameter=val;
        break;
        case 'confirmCon':this.info.confirmCon=val;
        break;
        case 'alertCon':this.info.alertCon=val;
        break;
        case 'someHiddenTag':this.info.someHiddenTag=val;
        break;
        case 'someHiddenEle':this.info.someHiddenEle=val;
        break;
        case 'overlay':this.info.overlay=val;
    };
       };
},

iniBuild:function ()
{
       G('dialogCase')?G('dialogCase').parentNode.removeChild(G('dialogCase')):function (){};
       var oDiv=document.createElement('span');
       oDiv.id='dialogCase';
       document.body.appendChild(oDiv);
},

build:function ()
{
       //设置全屏蒙布的z-index
       var baseZIndex=10001+this.info.overlay*10;
       //设置蒙布上的弹出窗口的z-index(比蒙布的z-index高2个值)
       var showZIndex=baseZIndex+2;

//定义框架名称
this.iframeIdName='ifr_popup'+this.info.overlay;

//设置图片的主路径
var path="http://img.baidu.com/hi/img/";

//关闭按钮
var close='<input type="image" id="dialogBoxClose" src="'+path+'dialogclose.gif" border="0" width="16" height="16" align="absmiddle" title="关闭"/>';

//使用滤镜设置对象的透明度
var cB='filter: alpha(opacity='+this.info.coverOpacity+');opacity:'+this.info.coverOpacity/100+';';

//设置全屏的蒙布
var cover='<div id="dialogBoxBG" style="position:absolute;top:0px;left:0px;width:100%;height:100%;z-index:'+baseZIndex+';'+cB+'background-color:'+this.color.cColor+';display:none;"></div>';

//设置弹出的主窗口设置
var mainBox='<div id="dialogBox" style="border:1px solid '+this.color.tColor+';display:none;z-index:'+showZIndex+';position:relative;width:'+this.config.width+'px;"><table width="100%" border="0" cellpadding="0" cellspacing="0" bgcolor="'+this.color.bColor+'">';

       //设置窗口标题栏
       if(this.config.isHaveTitle)
       {
    mainBox+='<tr height="24" bgcolor="'+this.color.tColor+'"><td><table style="-moz-user-select:none;height:24px;" width="100%" border="0" cellpadding="0" cellspacing="0" ><tr>'+'<td width="6" height="24"></td><td id="dialogBoxTitle" style="color:'+this.color.wColor+';font-size:14px;font-weight:bold;">'+this.info.title+' </td>'+'<td id="dialogClose" width="20" align="right" valign="middle">'+close+'</td><td width="6"></td></tr></table></td></tr>';
       }
       else
       {
    mainBox+='<tr height="10"><td align="right">'+close+'</td></tr>';
       };

//设置窗口主内容区域
mainBox+='<tr style="height:'+this.config.height+'px" valign="top"><td id="dialogBody" style="position:relative;"></td></tr></table></div>'+'<div id="dialogBoxShadow" style="display:none;z-index:'+baseZIndex+';"></div>';

       //如果有蒙布
       if(!this.config.isBackgroundCanClick)
       {
    G('dialogCase').innerHTML=cover+mainBox;
    G('dialogBoxBG').style.height=document.body.scrollHeight;
       }
       else
       {
    G('dialogCase').innerHTML=mainBox;
       }

Event.observe(G('dialogBoxClose'),"click", this.reset.bindAsEventListener(this),false);

       //如果支持拖动,则设置拖动处理
       if(this.config.isSupportDraging)
       {
    dropClass=new Dragdrop(this.config.width,this.config.height, this.info.shadowWidth,this.config.isSupportDraging,this.config.contentType);
    G("dialogBoxTitle").style.cursor="move";
       };

this.lastBuild();
},

lastBuild:function ()
{
       //设置confim对话框的具体内容
       var confirm='<div style="width:100%;height:100%;text-align:center;"><div style="margin:20px 20px 0 20px;font-size:14px;line-height:16px;color:#000000;">'+this.info.confirmCon+'</div><div style="margin:20px;"><input id="dialogOk" type="button" value=" 确定 "/> <input id="dialogCancel" type="button" value=" 取消 "/></div></div>';
       //设置alert对话框的具体内容
       var alert='<div style="width:100%;height:100%;text-align:center;"><div style="margin:20px 20px 0 20px;font-size:14px;line-height:16px;color:#000000;">'+this.info.alertCon+'</div><div style="margin:20px;"><input id="dialogYES" type="button" value=" 确定 "/></div></div>';

var baseZIndex=10001+this.info.overlay*10;
var coverIfZIndex=baseZIndex+4;

       //判断内容类型决定窗口的主内容区域应该显示什么
       if(this.config.contentType==1)
       {
    var openIframe="<iframe width='100%' style='height:"+this.config.height+"px' name='"+this.iframeIdName+"' id='"+this.iframeIdName+"' src='"+this.info.contentUrl+"' frameborder='0' scrolling='"+this.config.scrollType+"'></iframe>";
    var coverIframe="<div id='iframeBG' style='position:absolute;top:0px;left:0px;width:1px;height:1px;z-index:"+coverIfZIndex+";filter: alpha(opacity=00);opacity:0.00;background-color:#ffffff;'><div>";
    G("dialogBody").innerHTML=openIframe+coverIframe;
       }
       else if(this.config.contentType==2)
       {
    G("dialogBody").innerHTML=this.info.contentHtml;
       }
       else if(this.config.contentType==3)
       {
    G("dialogBody").innerHTML=confirm;Event.observe(G('dialogOk'),"click",this.forCallback.bindAsEventListener(this),false);
    Event.observe(G('dialogCancel'),"click",this.close.bindAsEventListener(this),false);
       }
       else if(this.config.contentType==4)
       {
    G("dialogBody").innerHTML=alert;
    Event.observe(G('dialogYES'),"click",this.close.bindAsEventListener(this),false);
       };
},

//重新加载弹出窗口的高度和内容
reBuild:function ()
{
G('dialogBody').height=G('dialogBody').clientHeight;
this.lastBuild();
},

show:function ()
{
       //隐藏一些在info中制定的元素
       this.hiddenSome();
       //弹出窗口居中
       this.middle();
       //设置阴影
       if(this.config.isShowShadow)
    this.shadow();
},

//设置回调函数
forCallback:function ()
{
return this.info.callBack(this.info.parameter);
},

//为弹出窗口设置阴影
shadow:function ()
{
       var oShadow=G('dialogBoxShadow');
       var oDialog=G('dialogBox');oShadow['style']['position']="absolute";
       oShadow['style']['background']="#000";
       oShadow['style']['display']="";
       oShadow['style']['opacity']="0.2";
       oShadow['style']['filter']="alpha(opacity=20)";
       oShadow['style']['top']=oDialog.offsetTop+this.info.shadowWidth;
       oShadow['style']['left']=oDialog.offsetLeft+this.info.shadowWidth;
       oShadow['style']['width']=oDialog.offsetWidth;oShadow['style']['height']=oDialog.offsetHeight;
},

//让弹出窗口居中显示
middle:function ()
{
       if(!this.config.isBackgroundCanClick)
    G('dialogBoxBG').style.display='';
       var oDialog=G('dialogBox');
       oDialog['style']['position']="absolute";
       oDialog['style']['display']='';
       var sClientWidth=document.body.clientWidth;
       var sClientHeight=document.body.clientHeight;
       var sScrollTop=document.body.scrollTop;
       //alert("document.body.clientWidth = " + sClientWidth + "\\ndocument.body.clientHeight" +sClientHeight);
       var sleft=(document.body.clientWidth/2)-(oDialog.offsetWidth/2);
       var iTop=-80+(sClientHeight/2+sScrollTop)-(oDialog.offsetHeight/2);
       var sTop=iTop>0?iTop:(sClientHeight/2+sScrollTop)-(oDialog.offsetHeight/2);
       //alert("var iTop=-80+(sClientHeight/2+sScrollTop)-(oDialog.offsetHeight/2);\\n" + "sClientHeight is " + sClientHeight + "\\nsScrollTop is " + sScrollTop);
       //alert("iTop is " + iTop);
       if(sTop<1)
    sTop="20";
       if(sleft<1)
    sleft="20";
       oDialog['style']['left']=sleft;
       oDialog['style']['top']=sTop;
       //alert("sleft is " + sleft);
       //alert("sTop is " + sTop);
},

//刷新页面，并关闭当前弹出窗口
reset:function ()
{
       if(this.config.isReloadOnClose)
       {
    top.location.reload();
       };
       this.close();
},

//关闭当前弹出窗口
close:function ()
{
       G('dialogBox').style.display='none';
       if(!this.config.isBackgroundCanClick)
    G('dialogBoxBG').style.display='none';
       if(this.config.isShowShadow)
    G('dialogBoxShadow').style.display='none';
       G('dialogBody').innerHTML='';

this.showSome();
},

//隐藏someHiddenTag和someHiddenEle中的所有元素
hiddenSome:function ()
{
       //隐藏someHiddenTag中的所有元素
       var tag=this.info.someHiddenTag.split(",");
       if(tag.length==1&&tag[0]=="")
       {
    tag.length=0;
       }
       for(var i=0;i<tag.length;i++)
       {
    this.hiddenTag(tag[i]);
       };
       //隐藏someHiddenEle中的所有逗号分割的ID的元素
       var ids=this.info.someHiddenEle.split(",");
       if(ids.length==1&&ids[0]=="")
    ids.length=0;
       for(var i=0;i<ids.length;i++)
       {
    this.hiddenEle(ids[i]);
       };
       //改变顶部和底部的div的id值为弹出状态的id值,祥见space的实现
       space("begin");
},

//隐藏一组元素
hiddenTag:function (tagName)
{
       var ele=document.getElementsByTagName(tagName);
       if(ele!=null)
       {
    for(var i=0;i<ele.length;i++)
    {
        if(ele[i].style.display!="none"&&ele[i].style.visibility!='hidden')
        {
     ele[i].style.visibility='hidden';
     this.someToHidden.push(ele[i]);
        };
    };
        };
    },

    //隐藏单个元素
    hiddenEle:function (id)
    {
       var ele=document.getElementById(id);
       if(typeof(ele)!="undefined"&&ele!=null)
       {
    ele.style.visibility='hidden';
    this.someToHidden.push(ele);
       }
    },

    //将someToHidden中保存的隐藏元素全部显示
    //并恢复顶部和底部的div为原来的id值
    showSome:function ()
    {
       for(var i=0;i<this.someToHidden.length;i++)
       {
    this.someToHidden[i].style.visibility='visible';
       };
       space("end");
    }
       };

//********************************************************Dragdrop类(拖拽动作)************************************************************

var Dragdrop=new Class();

Dragdrop.prototype={
initialize:function (width,height,shadowWidth,showShadow,contentType)
{
       this.dragData=null;
       this.dragDataIn=null;
       this.backData=null;
       this.width=width;
       this.height=height;
       this.shadowWidth=shadowWidth;
       this.showShadow=showShadow;
       this.contentType=contentType;
       this.IsDraging=false;
       this.oObj=G('dialogBox');
       Event.observe(G('dialogBoxTitle'),"mousedown",this.moveStart.bindAsEventListener(this),false);
},

moveStart:function (event)
{
       this.IsDraging=true;
       if(this.contentType==1)
       {
    G("iframeBG").style.display="";
    G("iframeBG").style.width=this.width;
    G("iframeBG").style.height=this.height;
       };
       Event.observe(document,"mousemove",this.mousemove.bindAsEventListener(this),false);
       Event.observe(document,"mouseup",this.mouseup.bindAsEventListener(this),false);
       Event.observe(document,"selectstart",this.returnFalse,false);
       this.dragData={x:Event.pointerX(event),y:Event.pointerY(event)};
       this.backData={x:parseInt(this.oObj.style.left),y:parseInt(this.oObj.style.top)};
},

mousemove:function (event)
{
       if(!this.IsDraging)
    return ;
       var iLeft=Event.pointerX(event)-this.dragData["x"]+parseInt(this.oObj.style.left);
       var iTop=Event.pointerY(event)-this.dragData["y"]+parseInt(this.oObj.style.top);
       if(this.dragData["y"]<parseInt(this.oObj.style.top))
    iTop=iTop-12;
       else if(this.dragData["y"]>parseInt(this.oObj.style.top)+25)
    iTop=iTop+12;
       this.oObj.style.left=iLeft;
       this.oObj.style.top=iTop;
       if(this.showShadow)
       {
    G('dialogBoxShadow').style.left=iLeft+this.shadowWidth;
    G('dialogBoxShadow').style.top=iTop+this.shadowWidth;
       };
       this.dragData={x:Event.pointerX(event),y:Event.pointerY(event)};
       document.body.style.cursor="move";
},

mouseup:function (event)
{
       if(!this.IsDraging)
    return ;
       if(this.contentType==1)
    G("iframeBG").style.display="none";
    document.onmousemove=null;
    document.onmouseup=null;
    var mousX=Event.pointerX(event)-(document.documentElement.scrollLeft||document.body.scrollLeft);
    var mousY=Event.pointerY(event)-(document.documentElement.scrollTop||document.body.scrollTop);
    if(mousX<1||mousY<1||mousX>document.body.clientWidth||mousY>document.body.clientHeight)
    {
        this.oObj.style.left=this.backData["x"];
        this.oObj.style.top=this.backData["y"];
        if(this.showShadow)
        {
     G('dialogBoxShadow').style.left=this.backData.x+this.shadowWidth;
     G('dialogBoxShadow').style.top=this.backData.y+this.shadowWidth;
        };
    };
    this.IsDraging=false;
    document.body.style.cursor="";
    Event.stopObserving(document,"selectstart",this.returnFalse,false);
},

returnFalse:function ()
{
return false;
}

};

例子：

[zz]百度空间中实现拖拽、悬浮窗口效果的popup.js分析

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