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用层模拟下拉列表框

大家都知道select的优先权比较高，css不宜控制，而且还能遮挡层的正常显示！那么我们就来模拟一个！这样样式就可以随心所欲了（若您看不到效果，请刷新）。

简单版：
<title>自制列表框</title><style>.selectdiv { border: 2px solid inset buttonface;}.optiondiv { border:1px solid black;border-top:0px;position:absolute;visibility:hidden;}.optiondiv div { font-size:11px;font-family:tahoma;padding-left:8px;line-height:160%;cursor:default;width:100%;}.defaultselect { font-size:11px;font-family:tahoma;text-align:center;border:1px solid white;cursor:default;width:77px;}.arrow { font-family:<a href="/list/web/index.html" title="web" target="_blank"><acronym>web</acronym></a>dings;line-height:13px;border:2px outset buttonhighlight;background-color:red;width:15px;text-align:center;cursor:default;font-size:8px;}</style><script language="<a href="/list/javascript/index.html" title="javascript" target="_blank"><acronym>javascript</acronym></a>" defer>//用户变量var owhere = document.body;var optiontext = new array();optiontext[0] = "--优秀网站--";optiontext[1] = "csdn<a href="/list/net/index.html" title=".net" target="_blank"><acronym>.net</acronym></a>";optiontext[2] = "蓝色理想";optiontext[3] = "pchome";optiontext[4] = "msdn.com";//下拉菜单主体var selectdiv = document.createelement("table");var selectdivtr = selectdiv.insertrow();var defaultvaluetd = selectdivtr.insertcell();var arrow = selectdivtr.insertcell();with(selectdiv)cellspacing=0,cellpadding=0,border=0,classname="selectdiv";with(defaultvaluetd)innertext = optiontext[0],classname="defaultselect";with(arrow)innertext=6,classname="arrow";owhere.appendchild(selectdiv);//外层divvar optiondiv = document.createelement("div");//设置下拉菜单选项的坐标和宽度with(optiondiv.style) { var select = selectdiv; var xy = getselectposition(select); pixelleft = xy[0]; pixeltop = xy[1]+select.offsetheight; width = selectdiv.offsetwidth; optiondiv.classname = "optiondiv";}//下拉菜单内容var options = new array();for (var i=0;i<optiontext.length;i++) { options[i] = optiondiv.appendchild(document.createelement("div"));}for (i=0;i<options.length;i++) { options[i].innertext = optiontext[i];}owhere.appendchild(optiondiv);/*事件*///禁止选择文本selectdiv.onselectstart = function() {return false;}optiondiv.onselectstart = function() {return false;}//下拉菜单的箭头arrow.onmousedown = function() { this.setcapture(); this.style.borderstyle="inset";}arrow.onmouseup = function() { this.style.borderstyle="outset"; this.releasecapture();}arrow.onclick = function() { event.cancelbubble = true; optiondiv.style.visibility = optiondiv.style.visibility=="visible"?"hidden":"visible";}document.onclick = function() { optiondiv.style.visibility = "hidden";}defaultvaluetd.onclick = function() { event.cancelbubble = true; optiondiv.style.visibility = optiondiv.style.visibility=="visible"?"hidden":"visible";}//移动option时的动态效果for (i=0;i<options.length;i++) { options[i].attachevent("onmouseover",function(){movewithoptions("highlight","white")}); options[i].attachevent("onmouseout",function(){movewithoptions("","")}); options[i].attachevent("onmouseup",selectedtext);}function movewithoptions(bg,color) { with(event.srcelement) { style.backgroundcolor = bg; style.color = color; }}function selectedtext() { with(event.srcelement) { defaultvaluetd.innertext = innertext; } with(defaultvaluetd.style)background="highlight",color="white";}/*通用函数*///获取对象坐标function getselectposition(obj) { var objleft = obj.offsetleft; var objtop = obj.offsettop; var objparent = obj.offsetparent; while (objparent.tagname != "body") { objleft += objparent.offsetleft; objtop += objparent.offsettop; objparent = objparent.offsetparent; } return([objleft,objtop]);}</script>
[ctrl+a 全部选择 提示：你可先修改部分代码，再按运行]

高级版：
[支持图片，16x16px（需设定路径），列表框弹出滚动效果支持传值（需设定），自适应宽度，根据最宽的一个选项自动调整，样式、效果基本摹仿select tag。]
<title>自定义列表框</title><style>.selectdiv { border: 2px solid inset buttonface;}.optiondiv { border:1px solid black;border-top:0px;position:absolute;cursor:default;clip:rect(auto auto 0% auto);}.optiondiv div { font-size:11px;font-family:tahoma;padding-left:8px;line-height:160%;background-color:white;}.optiondiv img { vertical-align: middle;margin-right:3px;}.defaultselect { font-size:11px;font-family:tahoma;padding-left:6px;border:1px solid white;cursor:default;}.defaultselect img { vertical-align: middle;margin-right:3px;}.arrow { font-family:<a href="/list/web/index.html" title="web" target="_blank"><acronym>web</acronym></a>dings;line-height:13px;border:2px outset buttonhighlight;background-color:buttonface;width:15px;text-align:center;cursor:default;font-size:8px;height:18px;}</style><body><span id="sel"></span><button style="font-family:arial;font-size:10px;width:22px;height:18px;margin-top:4px;" onclick="putvalue()">go</button><script language="<a href="/list/javascript/index.html" title="javascript" target="_blank"><acronym>javascript</acronym></a>">//用户变量var owhere = document.getelementbyid("sel");//显示文字var optiontext = new array();optiontext[0] = "--优秀网站--";optiontext[1] = "piggydesign.yeah<a href="/list/net/index.html" title=".net" target="_blank"><acronym>.net</acronym></a>";optiontext[2] = "蓝色理想";optiontext[3] = "pchome<a href="/list/net/index.html" title=".net" target="_blank"><acronym>.net</acronym></a>";optiontext[4] = "sina.com.cn";//显示图片var optionimg = new array();optionimg[0] = "";optionimg[1] = "";optionimg[2] = new image(),optionimg[2].src="http://www.sayee.com/cloudchen/<a href="/list/js/index.html" title="js" target="_blank"><acronym>js</acronym></a>/images/blue<a href="/list/idea/index.html" title="idea" target="_blank"><acronym>idea</acronym></a>.gif";optionimg[3] = new image(),optionimg[3].src="http://www.sayee.com/cloudchen/<a href="/list/js/index.html" title="js" target="_blank"><acronym>js</acronym></a>/images/pchome.gif";optionimg[4] = new image(),optionimg[4].src="http://www.sayee.com/cloudchen/<a href="/list/js/index.html" title="js" target="_blank"><acronym>js</acronym></a>/images/sina.gif";var optionvalue = new array();optionvalue[0] = "";optionvalue[1] = "http://piggydesign.yeah<a href="/list/net/index.html" title=".net" target="_blank"><acronym>.net</acronym></a>";optionvalue[2] = "http://www.blue<a href="/list/idea/index.html" title="idea" target="_blank"><acronym>idea</acronym></a>.com";optionvalue[3] = "http://www.pchome<a href="/list/net/index.html" title=".net" target="_blank"><acronym>.net</acronym></a>";optionvalue[4] = "http://www.sina.com.cn";//系统变量var selectedover = false;var selectedvalue = 0;//下拉菜单主体var selectdiv = document.createelement("table");var selectdivtr = selectdiv.insertrow();var defaultvaluetd = selectdivtr.insertcell();var arrow = selectdivtr.insertcell();with(selectdiv)cellspacing=0,cellpadding=0,border=0,classname="selectdiv";with(defaultvaluetd)inner<a href="/list/html/index.html" title="html" target="_blank"><acronym>html</acronym></a> = showoptionimg(1)+optiontext[0],classname="defaultselect";with(arrow)innertext=6,classname="arrow";owhere.appendchild(selectdiv);//外层divvar optiondiv = document.createelement("div");//设置下拉菜单选项的坐标和宽度with(optiondiv.style) { var select = selectdiv; var xy = getselectposition(select); pixelleft = xy[0]; pixeltop = xy[1]+select.offsetheight; optiondiv.classname = "optiondiv";}//下拉菜单内容var options = new array();for (var i=0;i<optiontext.length;i++) { options[i] = optiondiv.appendchild(document.createelement("div"));}for (i=0;i<options.length;i++) { options[i].inner<a href="/list/html/index.html" title="html" target="_blank"><acronym>html</acronym></a> = showoptionimg(i)+optiontext[i]; options[i].index = i;}owhere.appendchild(optiondiv);//列表宽度自适应var selectwidth = options[0].offsetwidth+arrow.offsetwidth+8;selectdiv.style.width=selectwidth;;optiondiv.style.width=selectwidth;/*事件*///禁止选择文本selectdiv.onselectstart = function() {return false;}optiondiv.onselectstart = function() {return false;}//下拉菜单的箭头arrow.onmousedown = function() { this.setcapture(); this.style.borderstyle="inset";}arrow.onmouseup = function() { event.cancelbubble = true; this.style.borderstyle="outset"; this.releasecapture(); showhide();}document.onmouseup = function() { optiondiv.style.clip="rect(auto auto 0% auto)"; if(selectedover) { with(defaultvaluetd.style)background="",color=""; selectedover=false; }}defaultvaluetd.onmouseup = function() { event.cancelbubble = true; showhide();}//移动option时的动态效果for (i=0;i<options.length;i++) { options[i].attachevent("onmouseover",function(){movewithoptions("highlight","white")}); options[i].attachevent("onmouseout",function(){movewithoptions("","")}); options[i].attachevent("onmouseup",selectedtext);}function movewithoptions(bg,color) { with(event.srcelement) { style.backgroundcolor = bg; style.color = color; }}function selectedtext() { event.cancelbubble=true; defaultvaluetd.inner<a href="/list/html/index.html" title="html" target="_blank"><acronym>html</acronym></a> = event.srcelement.inner<a href="/list/html/index.html" title="html" target="_blank"><acronym>html</acronym></a>; with(defaultvaluetd.style)background="highlight",color="white"; optiondiv.style.clip="rect(auto auto 0% auto)"; selectedover = true; selectedvalue = event.srcelement.index;}i = 0;/*通用函数*///获取对象坐标function getselectposition(obj) { var objleft = obj.offsetleft; var objtop = obj.offsettop; var objparent = obj.offsetparent; while (objparent.tagname != "body") { objleft += objparent.offsetleft; objtop += objparent.offsettop; objparent = objparent.offsetparent; } return([objleft,objtop]);}function showoptionimg(index) { var imgsrc = optionimg[index].src; if (imgsrc!=undefined) return("<img src="+optionimg[index].src+">") else return("");}function dynamicoptions() { optiondiv.style.clip="rect(auto auto "+i+"% auto)",i=i+20; if(i<101) settimeout("dynamicoptions()",5); else i=0;}function showhide() { with(optiondiv.style) { if (clip=="rect(auto auto 0% auto)"clip=="") dynamicoptions(); else clip="rect(auto auto 0% auto)"; }}function putvalue() { var url = optionvalue[selectedvalue]; if (url) window.open(url)}</script>
[ctrl+a 全部选择 提示：你可先修改部分代码，再按运行]

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