本文介绍了一个可编辑的下拉选择框的实现方法，该选择框允许用户直接输入内容，并提供了下拉菜单供用户选择预设选项。通过简单的HTML、CSS和JavaScript代码实现了这一功能。
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>可输入的select</title>
<style>
.optionForSel {font-size:9pt}
</style>
</head>
<body leftmargin="50" topmargin="50">
<table cellpadding="0" cellspacing="0" border="0" width="300">
<tr>
<td id="selectLength" width="100%" style="height:20px;padding:0px;border:2px inset #404040;border-right:0px;border-bottom:1px solid #D4D0C8;font-size:9pt;">
<div id="selectedValue" style="padding:2px;border:0px;width:100%;height:20px;font-size:9pt;vertical-align:bottom"></div>
</td>
<td width="20" style="height:20px;padding:0px;border-top:2px inset #404040;border-left:0px;border-right:1px solid #D4D0C8;border-bottom:1px solid #D4D0C8;font-size:9pt">
<img src="images/button2.gif" border="0" id="mm" onclick="mm_Click()" align="absmiddle" width="18" height="18">
</td>
</tr>
</table>
<div id="dropdownOption" style="position:absolute;visibility:hidden;width:100%;border:1px solid #080808;z-index:10">
<table width="100%" cellpadding="0" cellspacing="1" class="optionForSel" bgcolor="White">
<tr>
<td onmouseover="this.style.backgroundColor='#0099ff'" onmouseout="this.style.backgroundColor=''" onclick="document.all.selectedValue.innerText=this.innerText">
Visit1
</td>
</tr>
<tr>
<td onmouseover="this.style.backgroundColor='#0099ff'" onmouseout="this.style.backgroundColor=''" onclick="document.all.selectedValue.innerText=this.innerText">
Visit2
</td>
</tr>
<tr>
<td onmouseover="this.style.backgroundColor='#0099ff'" onmouseout="this.style.backgroundColor=''" onclick="document.all.selectedValue.innerText=this.innerText">
Visit3
</td>
</tr>
</table>
</div>
<script>
function mm_Click(){
if (document.all.dropdownOption.style.visibility == 'visible')
document.all.dropdownOption.style.visibility = 'hidden'
else
document.all.dropdownOption.style.visibility = 'visible'
}
function init(){
document.all.dropdownOption.style.width = document.all.selectLength.clientWidth + 22;
document.all.selectedValue.contentEditable = true;
var strTop = 0;
var strLeft = 0;
var e1 = document.all.selectLength;
while(e1.tagName != "BODY"){
strTop += e1.offsetTop
strLeft += e1.offsetLeft
e1 = e1.offsetParent
}
document.all.dropdownOption.style.top = String(strTop + 24) + "px";
document.all.dropdownOption.style.left = String(strLeft) + "px";
}
function clickE(){
if(window.event.srcElement.id !='mm')
document.all.dropdownOption.style.visibility = 'hidden';
}
document.onclick = clickE
window.onload = init
</script>
<br>
<br>
<input type="button" value="得到选中的值" onclick="alert(document.all.selectedValue.innerText)">
</body>
</html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>可输入的select</title>
<style>
.optionForSel {font-size:9pt}
</style>
</head>
<body leftmargin="50" topmargin="50">
<table cellpadding="0" cellspacing="0" border="0" width="300">
<tr>
<td id="selectLength" width="100%" style="height:20px;padding:0px;border:2px inset #404040;border-right:0px;border-bottom:1px solid #D4D0C8;font-size:9pt;">
<div id="selectedValue" style="padding:2px;border:0px;width:100%;height:20px;font-size:9pt;vertical-align:bottom"></div>
</td>
<td width="20" style="height:20px;padding:0px;border-top:2px inset #404040;border-left:0px;border-right:1px solid #D4D0C8;border-bottom:1px solid #D4D0C8;font-size:9pt">
<img src="images/button2.gif" border="0" id="mm" onclick="mm_Click()" align="absmiddle" width="18" height="18">
</td>
</tr>
</table>
<div id="dropdownOption" style="position:absolute;visibility:hidden;width:100%;border:1px solid #080808;z-index:10">
<table width="100%" cellpadding="0" cellspacing="1" class="optionForSel" bgcolor="White">
<tr>
<td onmouseover="this.style.backgroundColor='#0099ff'" onmouseout="this.style.backgroundColor=''" onclick="document.all.selectedValue.innerText=this.innerText">
Visit1
</td>
</tr>
<tr>
<td onmouseover="this.style.backgroundColor='#0099ff'" onmouseout="this.style.backgroundColor=''" onclick="document.all.selectedValue.innerText=this.innerText">
Visit2
</td>
</tr>
<tr>
<td onmouseover="this.style.backgroundColor='#0099ff'" onmouseout="this.style.backgroundColor=''" onclick="document.all.selectedValue.innerText=this.innerText">
Visit3
</td>
</tr>
</table>
</div>
<script>
function mm_Click(){
if (document.all.dropdownOption.style.visibility == 'visible')
document.all.dropdownOption.style.visibility = 'hidden'
else
document.all.dropdownOption.style.visibility = 'visible'
}
function init(){
document.all.dropdownOption.style.width = document.all.selectLength.clientWidth + 22;
document.all.selectedValue.contentEditable = true;
var strTop = 0;
var strLeft = 0;
var e1 = document.all.selectLength;
while(e1.tagName != "BODY"){
strTop += e1.offsetTop
strLeft += e1.offsetLeft
e1 = e1.offsetParent
}
document.all.dropdownOption.style.top = String(strTop + 24) + "px";
document.all.dropdownOption.style.left = String(strLeft) + "px";
}
function clickE(){
if(window.event.srcElement.id !='mm')
document.all.dropdownOption.style.visibility = 'hidden';
}
document.onclick = clickE
window.onload = init
</script>
<br>
<br>
<input type="button" value="得到选中的值" onclick="alert(document.all.selectedValue.innerText)">
</body>
</html>
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