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效果如图：
代码如下：
<HTML>
<HEAD><title>漂亮的下拉框</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<SCRIPT>
// ViaSelect Environment Constants
var SS_ENV = new Object();
SS_ENV.IE_Version = new Number(((window.navigator.appVersion.split('; '))[1].split(' '))[1]);
SS_ENV.CR = new Object();
SS_ENV.CR.ReverseBackground = '#E2519C';
SS_ENV.CR.ReverseText = 'white';
SS_ENV.CR.Border = '#D55C9A';
SS_ENV.CR.BorderActive = '#FF6CB7';
SS_ENV.DefaultHeight = 20;
SS_ENV.ButtonWidth = 13;
SS_ENV.OptionsDivStyle = ''
+ ' display:none;'
+ ' z-index:10;'
+ ' position:absolute;'
+ ' border:1 solid '+ SS_ENV.CR.Border+';'
+ ' background-color:white;'
+ ' scrollbar-face-color:#D4D0C8;'
+ ' scrollbar-shadow-color:white;'
+ ' scrollbar-highlight-color:#F6F5F4;'
+ ' scrollbar-3dlight-color:white'
+ ' scrollbar-darkshadow-color:#86837E;'
+ ' scrollbar-track-color:#F6F5F4;'
+ ' scrollbar-arrow-color:#86837E;';
SS_ENV.OptionNobrStyle = ''
+ ' font-size:12px;'
+ ' font-family:奔覆;';
// SaySelect Variables
var SS_VAR = new Object();
SS_VAR.DivDummy = document.createElement("DIV");
SS_VAR.SelectList = new Array();
SS_VAR.bEventAttached = false;
var SS_CreatedElements = new Object();
img_s_src="btn_down_s.gif";
img_src="btn_down.gif";
img_blank_src="img_blank.gif";
function unloadObjects()
{
try {
if (SS_VAR && SS_VAR.SelectList)
{
for (key in SS_VAR.SelectList)
{
if (SS_VAR.SelectList[key])
{
try {
SS_VAR.SelectList[key].select.setAttribute('SS', 0);
} catch (e) {};
delete SS_VAR.SelectList[key];
}
}
}
} catch (e) {};
}
attachEvent("onunload", unloadObjects);
function SS_create (srcHTML, ListMax, bAutoDetect)
{
// property
this.ssID = SS_VAR.SelectList.length;
this.bOriginalSelect = (bAutoDetect && SS_ENV.IE_Version < 5.5);
this.select = SS_createElement(srcHTML);
this.selectedIndex = this.select.selectedIndex;
this.options = this.select.options;
this.width = parseInt(this.select.style.width);
this.height = (this.select.style.height) ? parseInt(this.select.style.height) : SS_ENV.DefaultHeight;
this.OptionHeight = this.height - 4;
this.bListDown = (ListMax && '-'==ListMax.toString().substr(0, 1)) ? false : true;
this.ListMax = (!isNaN(parseInt(ListMax))) ? Math.abs(ListMax) : 100;
this.Table;
this.TitleDiv;
this.TitleTable;
this.TitleWrapper;
this.OptionsDiv;
this.OptionsWrapper;
this.OptionsTable;
this.bFocused = false;
this.bExpanded = false;
this.bReverse = false;
// private method
this.isThisEventToBeCanceled = SS_isThisEventToBeCanceled;
this.toggleTitle = SS_toggleTitle;
this.syncSelectedIndex = SS_syncSelectedIndex;
this.toggleOptions = SS_toggleOptions;
this.turnOnOption = SS_turnOnOption;
this.turnOffOption = SS_turnOffOption;
this.handleMousewheel = SS_handleMousewheel;
this.handleOverTitle = SS_handleOverTitle;
this.handleOutTitle = SS_handleOutTitle;
this.handleOverOption = SS_handleOverOption;
this.createTable = SS_createTable;
this.createTitleDiv = SS_createTitleDiv;
this.createOptionsDiv = SS_createOptionsDiv;
this.createOptionTr = SS_createOptionTr;
this.adjustOptionsDiv = SS_adjustOptionsDiv;
this.syncOptions = SS_syncOptions;
this.pressOption = SS_pressOption;
this.moveOption = SS_moveOption;
this.releaseOption = SS_releaseOption;
this.pressTitle = SS_pressTitle;
this.releaseTitle = SS_releaseTitle;
// public method
this.display = SS_display;
this.insertOption = SS_insertOption;
this.deleteOption = SS_deleteOption;
this.changeOption = SS_changeOption;
// initiate
this.createTable();
this.select.setAttribute('SS', this);
if (!this.bOriginalSelect)
this.select.onpropertychange = SS_handlePropertychange;
SS_VAR.SelectList[this.ssID] = this;
}
function SS_display ()
{
document.write("<div id=SS_TempDiv></div>\n");
document.all.SS_TempDiv.appendChild(this.Table);
document.all.SS_TempDiv.removeNode();
}
function SS_write (srcHTML, ListMax, bAutoDetect)
{
var oSS = new SS_create(srcHTML, ListMax, bAutoDetect);
oSS.display();
return oSS;
}
function SS_insertOption (value, innerText, idx)
{
var NewOption = document.createElement("OPTION");
SS_CreatedElements[SS_CreatedElements.length] = NewOption;
this.options.add(NewOption, idx);
NewOption.innerText = innerText;
NewOption.value = value;
if (!this.bOriginalSelect)
this.createOptionTr(idx);
this.syncOptions();
this.adjustOptionsDiv();
this.syncSelectedIndex();
}
function SS_deleteOption (idx)
{
this.options.remove(idx);
if (!this.bOriginalSelect)
this.OptionsTable.deleteRow(idx);
this.syncOptions();
this.adjustOptionsDiv();
this.syncSelectedIndex();
}
function SS_changeOption (idx, value, innerText)
{
this.options[idx].value = value;
this.options[idx].innerText = innerText;
this.syncOptions();
this.syncSelectedIndex();
}
function SS_cancelEvent (event)
{
event.cancelBubble = true;
event.returnValue = false;
}
function SS_isThisEventToBeCanceled (event)
{
if ('object' == typeof(event)) {
switch (event.type) {
case 'mousedown':
if (!(event.button & 1)) return true;
break;
case 'mouseup':
if (!(event.button & 1)) return true;
if (SS_ENV.IE_Version >= 5.5 && event.srcElement != this.srcElementOfLastMousedown && this.srcElementOfLastMousedown !=
null) {
this.srcElementOfLastMousedown = null;
return true;
}
break;
case 'mouseout':
if (!(SS_ENV.IE_Version < 5.5 && event.srcElement == this.srcElementOfLastMousedown))
return true;
break;
case 'mousemove':
if (SS_ENV.IE_Version >= 5.5 && event.srcElement != this.srcElementOfLastMousedown && this.srcElementOfLastMousedown !=
null)
return true;
break;
}
}
return false;
}
function SS_createElement (html)
{
SS_VAR.DivDummy.insertAdjacentHTML('afterBegin', html);
var oEl = SS_VAR.DivDummy.children(0);
while (SS_VAR.DivDummy.children.length > 0) {
SS_VAR.DivDummy.removeChild(SS_VAR.DivDummy.children(0));
}
return oEl;
}
function SS_blurExcept (except)
{
SS_cancelEvent(window.event);
except = ('number'==typeof(except)) ? except : -1;
var bHasToDetachEvent = true;
for (var i=0; i < SS_VAR.SelectList.length; i++) {
if (-1==except && SS_VAR.SelectList[i].bFocused && SS_VAR.SelectList[i].bExpanded) {
SS_VAR.SelectList[i].toggleOptions(false, true);
SS_VAR.SelectList[i].toggleTitle(true);
bHasToDetachEvent = false;
}
else if (i!=except) {
if (SS_VAR.SelectList[i].bExpanded)
SS_VAR.SelectList[i].toggleOptions(false, true);
if (SS_VAR.SelectList[i].bReverse)
SS_VAR.SelectList[i].toggleTitle(false);
SS_VAR.SelectList[i].bFocused = false;
}
}
if (SS_VAR.bEventAttached && bHasToDetachEvent) {
document.detachEvent('onmousedown', SS_blurExcept);
document.detachEvent('ondblclick', SS_blurExcept);
SS_VAR.bEventAttached = false;
}
}
function SS_syncSelectedIndex ()
{
this.selectedIndex = this.select.selectedIndex;
if (this.bOriginalSelect) return;
if (this.TitleTable.cells(0).childNodes(0).innerText != this.options[this.selectedIndex].innerText)
this.TitleTable.cells(0).childNodes(0).innerText = this.options[this.selectedIndex].innerText;
if (this.bExpanded)
this.toggleOptions(false);
}
function SS_toggleTitle (bReverse)
{
this.bReverse = ('undefined'!=typeof(bReverse)) ? bReverse: (!this.bReverse);
this.TitleTable.cells(0).style.backgroundColor = this.bReverse ? SS_ENV.CR.ReverseBackground : '';
this.TitleTable.cells(0).style.color = this.bReverse ? SS_ENV.CR.ReverseText : '';
}
function SS_toggleOptions (bExpanded, bStrict)
{
if (!bStrict && !this.bFocused) {
SS_blurExcept(this.ssID);
}
this.bExpanded = ('undefined'!=typeof(bExpanded)) ? bExpanded: (!this.bExpanded);
if (this.bExpanded) {
this.adjustOptionsDiv();
this.OptionsDiv.style.display = 'block';
if (!bStrict) {
this.toggleTitle(false);
this.handleOverOption(this.selectedIndex);
}
this.handleOutTitle();
}
else {
this.OptionsDiv.style.display = 'none';
if (!bStrict) {
this.toggleTitle(true);
}
}
if (!bStrict) {
this.bFocused = true;
if (!SS_VAR.bEventAttached) {
document.attachEvent('onmousedown', SS_blurExcept);
document.attachEvent('ondblclick', SS_blurExcept);
SS_VAR.bEventAttached = true;
}
}
}
function SS_handlePropertychange ()
{
if ('propertychange'==window.event.type && 'selectedIndex'==window.event.propertyName) {
var oSS = window.event.srcElement.SS;
oSS.syncSelectedIndex();
if (null != oSS.select.onchange)
oSS.select.onchange();
}
}
function SS_handleMousewheel (event)
{
var idx = this.selectedIndex;
if ('mousewheel'==event.type && this.bFocused && this.bReverse) {
for (var i=0; i < event.wheelDelta; i += 120)
idx--;
for (var i=0; i > event.wheelDelta; i -= 120)
idx++;
}
idx = Math.max(idx, 0);
idx = Math.min(idx, this.options.length - 1);
this.select.selectedIndex = idx;
}
function SS_handleOverTitle ()
{
if (this.bExpanded)
return;
this.TitleTable.style.borderColor = SS_ENV.CR.BorderActive;
this.TitleTable.cells(1).style.display = 'none';
this.TitleTable.cells(2).style.display = 'block';
}
function SS_handleOutTitle ()
{
this.TitleTable.style.borderColor = SS_ENV.CR.Border;
this.TitleTable.cells(2).style.display = 'none';
this.TitleTable.cells(1).style.display = 'block';
}
function SS_handleOverOption (idx)
{
for (var i=0; i < this.options.length; i++) {
if (i==idx)
this.turnOnOption(i);
else
this.turnOffOption(i);
}
}
function SS_turnOnOption (idx)
{
this.OptionsTable.cells(idx).style.color = SS_ENV.CR.ReverseText;
this.OptionsTable.cells(idx).style.backgroundColor = SS_ENV.CR.ReverseBackground;
}
function SS_turnOffOption (idx)
{
this.OptionsTable.cells(idx).style.color = '';
this.OptionsTable.cells(idx).style.backgroundColor = '';
}
function SS_adjustOptionsDiv ()
{
if (this.bOriginalSelect) return;
this.OptionsDiv.style.width = this.width;
this.OptionsDiv.style.height = Math.min(this.options.length, this.ListMax) * this.OptionHeight + 2;
this.OptionsWrapper.style.height = this.options.length * this.OptionHeight;
this.OptionsDiv.style.overflowY = (this.options.length > this.ListMax) ? 'scroll' : '';
var top = this.Table.offsetTop;
var left = this.Table.offsetLeft;
for (var El = this.Table.offsetParent; 'BODY'!=El.tagName && 'absolute'!=El.style.position && 'relative'!=El.style.position;
El = El.offsetParent) {
if ('TABLE' != El.tagName) {
top += El.clientTop;
left += El.clientLeft;
}
top += El.offsetTop;
left += El.offsetLeft;
}
this.OptionsDiv.style.top = (this.bListDown) ? (top + this.height) : (top - parseInt(this.OptionsDiv.style.height));
this.OptionsDiv.style.left = left;
this.TitleWrapper.style.top = 0;
this.TitleWrapper.style.left = 0;
}
function SS_syncOptions ()
{
if (this.bOriginalSelect) return;
for (var i=0; i < this.options.length; i++) {
this.OptionsTable.cells(i).setAttribute('index', i);
if (this.OptionsTable.cells(i).childNodes(0).innerText != this.options[i].innerText)
this.OptionsTable.cells(i).childNodes(0).innerText = this.options[i].innerText;
}
}
function SS_pressTitle (event)
{
SS_cancelEvent(event);
this.srcElementOfLastMousedown = event.srcElement;
this.toggleOptions();
}
function SS_releaseTitle (event)
{
SS_cancelEvent(event);
if (this.isThisEventToBeCanceled(event)) return;
this.srcElementOfLastMousedown = null;
}
function SS_pressOption (event)
{
SS_cancelEvent(event);
this.srcElementOfLastMousedown = event.srcElement;
}
function SS_moveOption (event)
{
SS_cancelEvent(event);
if (this.isThisEventToBeCanceled(event)) return;
if (!(event.offsetX >= 0 && event.offsetX <= this.OptionsTable.offsetWidth)) return;
this.handleOverOption(Math.floor(event.offsetY / this.OptionHeight));
}
function SS_releaseOption (event)
{
SS_cancelEvent(event);
if (this.isThisEventToBeCanceled(event)) return;
this.srcElementOfLastMousedown = null;
if (event.offsetX >= 0 && event.offsetX <= this.OptionsTable.offsetWidth) {
this.toggleOptions(false);
this.select.selectedIndex = Math.floor(event.offsetY / this.OptionHeight);
}
}
function SS_createTable ()
{
this.Table = SS_createElement(""
+ "<table border=0 cellpadding=0 cellspacing=0 style='table-layout:fixed; cursor:default'>"
+ "<tr><td></td></tr>"
+ "</table>"
);
if (!isNaN(this.width))
this.Table.style.width = this.width;
this.Table.style.height = this.height;
if (!this.bOriginalSelect) {
this.createTitleDiv();
this.createOptionsDiv();
this.Table.cells(0).appendChild(this.TitleDiv);
this.Table.cells(0).appendChild(this.OptionsDiv);
}
else {
this.Table.cells(0).appendChild(this.select);
}
}
function SS_createTitleDiv ()
{
this.TitleDiv = SS_createElement(""
+ "<div style='position:relative; top:0; left:0;'>"
+ " <table border=0 cellpadding=0 cellspacing=1"
+ " height="+this.height
+ " bgcolor=white"
+ " style='table-layout:fixed; border:1 solid "+SS_ENV.CR.Border+";'"
+ " onmouseover='SS_VAR.SelectList["+this.ssID+"].adjustOptionsDiv()'"
+ " >"
+ " <tr>"
+ " <td><nobr style='text-oveflow:hidden;"+SS_ENV.OptionNobrStyle+"'></nobr></td>"
+ " <td width="+SS_ENV.ButtonWidth+" align=center style='word-wrap:normal'></td>"
+ " <td style='display:none' width="+SS_ENV.ButtonWidth+" align=center style='word-wrap:normal'></td>"
+ " <td style='display:none'></td>"
+ " </tr>"
+ " </table>"
+ "</div>"
);
this.TitleTable = this.TitleDiv.childNodes(0);
this.TitleTable.cells(0).childNodes(0).innerText = this.options[this.selectedIndex].innerText;
this.TitleTable.cells(1).innerHTML = "<img src='"+img_src+"' border=0 align=absmiddle>";
this.TitleTable.cells(2).innerHTML = "<img src='"+img_s_src+"' border=0 align=absmiddle>";
this.TitleTable.cells(3).appendChild(this.select);
this.TitleWrapper = document.createElement(""
+ "<img src='"+img_blank_src+"'"
+ " style='position:absolute; top:0; left:0; z-index:2; width:100%; height:"+this.height+";'"
+ " onmouseover='SS_VAR.SelectList["+this.ssID+"].handleOverTitle()'"
+ " onmouseout='SS_VAR.SelectList["+this.ssID+"].handleOutTitle(); SS_VAR.SelectList["+this.ssID+"].releaseTitle(window.
event);'"
+ " onmousedown='SS_VAR.SelectList["+this.ssID+"].pressTitle(window.event)'"
+ " ondblclick='SS_VAR.SelectList["+this.ssID+"].pressTitle(window.event); SS_VAR.SelectList["+this.ssID+"].releaseTitle(
window.event);'"
+ " onmouseup='SS_VAR.SelectList["+this.ssID+"].releaseTitle(window.event)'"
+ " onmousewheel='SS_VAR.SelectList["+this.ssID+"].handleMousewheel(window.event)'"
+ " ondragstart='SS_cancelEvent(window.event)'"
+ ">"
);
SS_CreatedElements[SS_CreatedElements.length] = this.TitleWrapper;
this.TitleDiv.appendChild(this.TitleWrapper);
}
function SS_createOptionsDiv ()
{
this.OptionsDiv = SS_createElement(""
+ "<div style='"+SS_ENV.OptionsDivStyle+"'"
+ " onscroll='SS_VAR.SelectList["+this.ssID+"].moveOption(window.event)'"
+ " onmousedown='SS_cancelEvent(window.event)'"
+ ">"
+ " <table border=0 cellpadding=0 cellspacing=0 width=100% style='table-layout:fixed'>"
+ " </table>"
+ "</div>"
);
this.OptionsTable = this.OptionsDiv.childNodes(0);
for (var i=0; i < this.options.length; i++) {
this.createOptionTr(i);
}
this.syncOptions();
this.OptionsWrapper = document.createElement(""
+ "<img src='"+img_blank_src+"'"
+ " style='position:absolute; top:0; left:0; width:100%;'"
+ " onmousedown='SS_VAR.SelectList["+this.ssID+"].pressOption(window.event)'"
+ " onmousemove='SS_VAR.SelectList["+this.ssID+"].moveOption(window.event)'"
+ " onmouseup='SS_VAR.SelectList["+this.ssID+"].releaseOption(window.event)'"
+ " onmouseout='SS_VAR.SelectList["+this.ssID+"].releaseOption(window.event)'"
+ " ondragstart='SS_cancelEvent(window.event)'"
+ ">"
);
SS_CreatedElements[SS_CreatedElements.length] = this.OptionsWrapper;
this.OptionsDiv.appendChild(this.OptionsWrapper);
}
function SS_createOptionTr (idx)
{
idx = ('undefined'!=typeof(idx)) ? idx : this.options.length - 1;
var OptionTr = this.OptionsTable.insertRow(-1);
var OptionTd = document.createElement("<td height="+this.OptionHeight+"></td>");
SS_CreatedElements[SS_CreatedElements.length] = this.OptionsTd;
OptionTd.appendChild(document.createElement("<nobr style='"+SS_ENV.OptionNobrStyle+"'></nobr>"));
OptionTr.appendChild(OptionTd);
}
</SCRIPT>
</head>
<body><script>SS_write("<select style='width:60;height:18px;font-size:12px' name=star>\n"
+" <option value=\"\" selected>不限</option>\n"
+"<option value=\"水瓶座\">水瓶座</option>"
+"<option value=\"双鱼座\">双鱼座</option>"
+"<option value=\"白羊座\">白羊座</option>"
+"<option value=\"金牛座\">金牛座</option>"
+"<option value=\"双子座\">双子座</option>"
+"<option value=\"巨蟹座\">巨蟹座</option>"
+"<option value=\"狮子座\">狮子座</option>"
+"<option value=\"处女座\">处女座</option>"
+"<option value=\"天秤座\">天秤座</option>"
+"<option value=\"天蝎座\">天蝎座</option>"
+"<option value=\"射手座\">射手座</option>"
+"<option value=\"摩羯座\">摩羯座</option>"
+"</select>\n");
</script><br>
<script>SS_write("<select name='province' style='width:60;height:18px;font-size:12px'>\n"
+"<option value=\"\" selected>都行</option>\n"
+"<option value=\"北京\">北京</option>"
+"<option value=\"上海\">上海</option>"
+"<option value=\"天津\">天津</option>"
+"<option value=\"重庆\">重庆</option>"
+"<option value=\"安徽\">安徽</option>"
+"<option value=\"福建\">福建</option>"
+"<option value=\"甘肃\">甘肃</option>"
+"<option value=\"广东\">广东</option>"
+"<option value=\"广西\">广西</option>"
+"<option value=\"贵州\">贵州</option>"
+"<option value=\"海南\">海南</option>"
+"<option value=\"河北\">河北</option>"
+"<option value=\"黑龙江\">黑龙江</option>"
+"<option value=\"河南\">河南</option>"
+"<option value=\"湖北\">湖北</option>"
+"<option value=\"湖南\">湖南</option>"
+"<option value=\"内蒙古\">内蒙古</option>"
+"<option value=\"江苏\">江苏</option>"
+"<option value=\"江西\">江西</option>"
+"<option value=\"吉林\">吉林</option>"
+"<option value=\"辽宁\">辽宁</option>"
+"<option value=\"宁夏\">宁夏</option>"
+"<option value=\"青海\">青海</option>"
+"<option value=\"山西\">山西</option>"
+"<option value=\"陕西\">陕西</option>"
+"<option value=\"山东\">山东</option>"
+"<option value=\"四川\">四川</option>"
+"<option value=\"江西\">江西</option>"
+"<option value=\"西藏\">西藏</option>"
+"<option value=\"新疆\">新疆</option>"
+"<option value=\"云南\">云南</option>"
+"<option value=\"浙江\">浙江</option>"
+"<option value=\"其它\">其它</option>"
+"</select>\n",8); </script>
</body>
</html>
其中
img_s_src="btn_down_s.gif"; //下拉框的下拉按钮图片
img_src="btn_down.gif"; //鼠标移到下拉按钮上时的图片
img_blank_src="img_blank.gif"; //空白图片 
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