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    >层遇到select框时　创建者：webmaster　更新时间：2005-05-16 22:42

    当层遇到下拉框时总是挡不了select框?其实这是IE的BUG,其它的浏览器没有这个问题,对于这个问题论坛里不少提出,在这里提供我的几种方法,各有各的好处,有错,有好的意见者提出,谢谢.

    1.最直接的方法:隐藏下拉框.

    下面提供的是一个比较通用的一组函数:

    test.htm

    ------------

    <script>
    var HideElementTemp = new Array();
    //点击菜单时，调用此的函数,菜单对象
    function cal_hideElementAll(obj){
    cal_HideElement("IMG",obj);
    cal_HideElement("SELECT",obj);
    cal_HideElement("OBJECT",obj);
    cal_HideElement("IFRAME",obj);
    }
    function cal_HideElement(strElementTagName,obj){
    try{
    var showDivElement = obj;
    var calendarDiv = obj;
    var intDivLeft = cal_GetOffsetLeft(showDivElement);
    var intDivTop = cal_GetOffsetTop(showDivElement);//+showDivElement.offsetHeight;
    //HideElementTemp=new Array()
    for(i=0;i<window.document.all.tags(strElementTagName).length; i++){
    var objTemp = window.document.all.tags(strElementTagName)[i];
    if(!objTemp||!objTemp.offsetParent)
    continue;
    var intObjLeft=cal_GetOffsetLeft(objTemp);
    var intObjTop=cal_GetOffsetTop(objTemp);
    if(((intObjLeft+objTemp.clientWidth)>intDivLeft)&&
    (intObjLeft<intDivLeft+calendarDiv.style.posWidth)&&
    (intObjTop+objTemp.clientHeight>intDivTop)&&
    (intObjTop<intDivTop+calendarDiv.style.posHeight)){
    //var intTempIndex=HideElementTemp.length;//已经有的长度
    //save elementTagName is stutas
    //HideElementTemp[intTempIndex]=new Array(objTemp,objTemp.style.visibility);
    HideElementTemp[HideElementTemp.length]=objTemp
    objTemp.style.visibility="hidden";
    }
    }
    }catch(e){alert(e.message)
    }
    }

    function cal_ShowElement(){
    var i;
    for(i=0;i<HideElementTemp.length; i++){
    var objTemp = HideElementTemp[i]
    if(!objTemp||!objTemp.offsetParent)
    continue;
    objTemp.style.visibility=''
    }
    HideElementTemp=new Array();
    }
    function cal_GetOffsetLeft(src){
    var set=0;
    if(src && src.name!="divMain"){
    if (src.offsetParent){
    set+=src.offsetLeft+cal_GetOffsetLeft(src.offsetParent);
    }
    if(src.tagName.toUpperCase()!="BODY"){
    var x=parseInt(src.scrollLeft,10);
    if(!isNaN(x))
    set-=x;
    }
    }
    return set;
    }

    function cal_GetOffsetTop(src){
    var set=0;
    if(src && src.name!="divMain"){
    if (src.offsetParent){
    set+=src.offsetTop+cal_GetOffsetTop(src.offsetParent);
    }
    if(src.tagName.toUpperCase()!="BODY"){
    var y=parseInt(src.scrollTop,10);
    if(!isNaN(y))
    set-=y;
    }
    }
    return set;
    }

    </script>
    <select></select>
    <select></select>
    <div style="position:absolute;left:0;top:0;width:100;height:100;background-color:red" onclick="cal_hideElementAll(this)">
    点击让select隐藏
    </div>
    <br><br><br><br><br><br>
    <input type="button" value="点击让select显示" onclick="cal_ShowElement()">

    以上这种方法,如果对于select框数目少,相对固定的话,直接用obj.style.visibility="hidden"这样进行隐藏是更直接的.

    2.Object对象的优先度较高,可以挡住select框

    <OBJECT id=aa style="display:none;z-index:1000; position:absolute; top:0; left:0; width:152; height: 200;" type="text/x-scriptlet" data="about:<body><div style='position:absolute;left:0;top:0;width:152;height:200;font:14;color:white;background:black;border:1 solid black'>test</div>"></OBJECT>
    <select><option>hellohellohellohello</select><button onclick=aa.style.display=aa.style.display=="none"?"":"none">test</button>

    这种方法虽然也简单,但对复杂的层是来说还不是好的解决方法

    3.用iframe作载体

    以下是一简单的例子:

    -----------

    <html>
    <head>
    <meta http-equiv="Content-Type" content="text/html; charset=gb2312">
    <meta name="GENERATOR" content="Microsoft FrontPage 4.0">
    <meta name="ProgId" content="FrontPage.Editor.Document">
    <title>简单菜单</title>
    <!--
    提供定位函数，用iframe作载体，不会被select挡住
    By Fason(2003-5-21)
    -->
    <style id=s>
    #div1{
    position:absolute;
    z-index:100;
    width:100;
    height:130;
    background-color:#d2e8ff;
    border:1 solid black;
    }
    div{cursor:hand;font-size:12px;}
    a{text-decoration:none;color:red;font-size:12px}
    </style>
    </head>
    <body>
    <script>
    function window.onload(){
    var shtml=div1.innerHTML;
    var ifm=document.createElement("<iframe frameborder=0 marginheight=0 marginwidth=0 hspace=0 vspace=0 scrolling=no></iframe>")
    ifm.style.width=div1.offsetWidth
    ifm.style.height=div1.offsetHeight
    ifm.name=ifm.uniqueID
    div1.innerHTML=""
    div1.appendChild(ifm)
    window.frames[ifm.name].document.write(s.outerHTML+"<body leftmargin=0 topmargin=0>"+shtml+"</body>")
    }

    function show(){
    with(document.all.img1){
    x=offsetLeft;
    y=offsetTop;
    objParent=offsetParent;
    while(objParent.tagName.toUpperCase()!= "BODY"){
    x+=objParent.offsetLeft;
    y+=objParent.offsetTop;
    objParent = objParent.offsetParent;
    }
    y+=offsetHeight-1
    }
    with(document.all.div1.style){
    pixelLeft=x
    pixelTop=y
    visibility=''
    }
    }
    function hide(){
    document.all.div1.style.visibility='hidden'
    }
    </script>
    <img id=img1 onmouseover="show()" onmouseout="hide()" src="ie.gif"><br><select></select>
    <div id=div1 onmouseover="style.visibility=''" onmouseout="style.visibility='hidden'" style="visibility:hidden;">
    <div href=" http://www.csdn.net " onmouseover="style.backgroundColor='highlight'" onmouseout="style.backgroundColor=''" onclick="window.open(href)">中国程序员</div>
    <div href=" http://www.sohu.com " onmouseover="style.backgroundColor='highlight'" onmouseout="style.backgroundColor=''" onclick="window.open(href)">sohu</div>
    </div>
    </body>
    </html>

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