一个可输入的下拉框的例子与大家交流
自己推销：
http://expert.csdn.net/Expert/TopicView1.asp?id=1812694
希望大家提出更好的改正意见阿！
http://webfx.eae.net/dhtml/combobox/combo_demo.htm
我认为关键要使用方便，同时可以用于动态编写（比如ASP、JSP、PHP等），这样就可以按照select元素的一般设置方法来使用，现在我做了改进，让动态加入的input元素继承使用了select的onchange方法，这样就更符合select元素的一般应用。
sixi_fish(思溪的鱼) ，你提供的这个，虽然做的很好，但要设置一个响应事件，可能就不大好设了，同时全是脚本的操作，假如给一个不懂菜鸟使用，能懂吗？再说，往input输入新值之后，一般应用中，可没有多少使用来添加到select中。问题值得讨论讨论！
学习中～～～～～
http://fason.nease.net/code/form/select/editselect2.htm
combo_demo.htm
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<title>ComboBox Demo</title>
<style>
body {font-size:9pt;font-family:verdana;}
button {cursor:hand;border:1px solid black;font-family:arial;font-size:9pt;}
a {color:red;}
a:hover {color:blue}
</style>
</head>
<body>
<script src="ComboBox.js"></script>
<script>
dm=new ComboBox("dm")
dm.add(
new ComboBoxItem("barge",1),
new ComboBoxItem("benluc",2),
new ComboBoxItem("benlieeeeck",3),
new ComboBoxItem("taco",4)
)
/*
// generate 1000 more to test performance
for (var i = 0; i < 100; i++ )
dm.add(new ComboBoxItem(String(i)));
*/
</script>
<br><br><br>
<button hidefocus onClick="alert(dm.value)">Show Value</button> <button hidefocus
onClick="dm.add(new ComboBoxItem(window.prompt(‘Type in the text to add‘,‘‘),window.prompt(‘Type in a value to add‘,‘‘)))"
>Add Item</button> <button hidefocus onClick="dm.remove(window.prompt(‘Type in an index to remove‘,‘‘))"
>Remove Item</button>
<br>
<br>
</body>
</html>
ComboBox.js
/*
* ComboBox
* By Jared Nuzzolillo
*
* Updated by Erik Arvidsson
* http://webfx.eae.net/contact.html#erik
* 2002-06-13 Fixed Mozilla support and improved build performance
*
*/
Global_run_event_hook = true;
Global_combo_array = new Array();
Array.prototype.remove=function(dx)
{
if(isNaN(dx)||dx>this.length){self.status=‘Array_remove:invalid request-‘+dx;return false}
for(var i=0,n=0;i<this.length;i++)
{
if(this[i]!=this[dx])
{
this[n++]=this[i]
}
}
this.length-=1
}
function ComboBox_make()
{
var bt,nm;
nm = this.name+"txt";
this.txtview = document.createElement("INPUT")
this.txtview.type = "text";
this.txtview.name = nm;
this.txtview.id = nm;
this.txtview.className = "combo-input"
this.view.appendChild(this.txtview);
this.valcon = document.createElement("INPUT");
this.valcon.type = "hidden";
this.view.appendChild(this.valcon)
var tmp = document.createElement("IMG");
tmp.src = "___";
tmp.style.width = "1px";
tmp.style.height = "0";
this.view.appendChild(tmp);
var tmp = document.createElement("BUTTON");
tmp.appendChild(document.createTextNode(6));
tmp.className = "combo-button";
this.view.appendChild(tmp);
tmp.onfocus = function () { this.blur(); };
tmp.onclick = new Function ("", this.name + ".toggle()");
}
function ComboBox_choose(realval,txtval)
{
this.value = realval;
var samstring = this.name+".view.childNodes[0].value=‘"+txtval+"‘"
window.setTimeout(samstring,1)
this.valcon.value = realval;
}
function ComboBox_mouseDown(e)
{
var obj,len,el,i;
el = e.target ? e.target : e.srcElement;
while (el.nodeType != 1) el = el.parentNode;
var elcl = el.className;
if(elcl.indexOf("combo-")!=0)
{
len=Global_combo_array.length
for(i=0;i<len;i++)
{
curobj = Global_combo_array[i]
if(curobj.opslist)
{
curobj.opslist.style.display=‘none‘
}
}
}
}
function ComboBox_handleKey(e)
{
var key,obj,eobj,el,strname;
eobj = e;
key = eobj.keyCode;
el = e.target ? e.target : e.srcElement;
while (el.nodeType != 1) el = el.parentNode;
elcl = el.className
if(elcl.indexOf("combo-")==0)
{
if(elcl.split("-")[1]=="input")
{
strname = el.id.split("txt")[0]
obj = window[strname];
obj.expops.length=0
obj.update();
obj.build(obj.expops);
if(obj.expops.length==1&&obj.expops[0].text=="(No matches)"){}//empty
else{obj.opslist.style.display=‘block‘;}
obj.value = el.value;
obj.valcon.value = el.value;
}
}
}
function ComboBox_update()
{
var opart,astr,alen,opln,i,boo;
boo=false;
opln = this.options.length
astr = this.txtview.value.toLowerCase();
alen = astr.length
if(alen==0)
{
for(i=0;i<opln;i++)
{
this.expops[this.expops.length]=this.options[i];boo=true;
}
}
else
{
for(i=0;i<opln;i++)
{
opart=this.options[i].text.toLowerCase().substring(0,alen)
if(astr==opart)
{
this.expops[this.expops.length]=this.options[i];boo=true;
}
}
}
if(!boo){this.expops[0]=new ComboBoxItem("(No matches)","")}
}
function ComboBox_remove(index)
{
this.options.remove(index)
}
function ComboBox_add()
{
var i,arglen;
arglen=arguments.length
for(i=0;i<arglen;i++)
{
this.options[this.options.length]=arguments[i]
}
}
function ComboBox_build(arr)
{
var str,arrlen
arrlen=arr.length;
str = ‘<table class="combo-list-width" cellpadding=0 cellspacing=0>‘;
var strs = new Array(arrlen);
for(var i=0;i<arrlen;i++)
{
strs[i] = ‘<tr>‘ +
‘<td class="combo-item" onClick="‘+this.name+‘.choose(\‘‘+arr[i].value+‘\‘,\‘‘+arr[i].text+‘\‘);‘+this.name+‘.opslist.style.display=\‘none\‘;"‘ +
‘onMouseOver="this.className=\‘combo-hilite\‘;" onMouseOut="this.className=\‘combo-item\‘" > ‘+arr[i].text+‘ </td>‘ +
‘</tr>‘;
}
str = str + strs.join("") + ‘</table>‘
if(this.opslist){this.view.removeChild(this.opslist);}
this.opslist = document.createElement("DIV")
this.opslist.innerHTML=str;
this.opslist.style.display=‘none‘;
this.opslist.className = "combo-list";
this.opslist.onselectstart=returnFalse;
this.view.appendChild(this.opslist);
}
function ComboBox_toggle()
{
if(this.opslist)
{
if(this.opslist.style.display=="block")
{
this.opslist.style.display="none"
}
else
{
this.update();
this.build(this.options);
this.view.style.zIndex = ++ComboBox.prototype.COMBOBOXZINDEX
this.opslist.style.display="block"
}
}
else
{
this.update();
this.build(this.options);
this.view.style.zIndex = ++ComboBox.prototype.COMBOBOXZINDEX
this.opslist.style.display="block"
}
}
function ComboBox()
{
if(arguments.length==0)
{
self.status="ComboBox invalid - no name arg"
}
this.name = arguments[0];
this.par = arguments[1]||document.body
this.view = document.createElement("DIV");
this.view.style.position=‘absolute‘;
this.options = new Array();
this.expops = new Array();
this.value = ""
this.build = ComboBox_build
this.make = ComboBox_make;
this.choose = ComboBox_choose;
this.add = ComboBox_add;
this.toggle = ComboBox_toggle;
this.update = ComboBox_update;
this.remove = ComboBox_remove;
this.make()
this.txtview = this.view.childNodes[0]
this.valcon = this.view.childNodes[1]
this.par.appendChild(this.view)
Global_combo_array[Global_combo_array.length]=this;
if(Global_run_event_hook){ComboBox_init()}
}
ComboBox.prototype.COMBOBOXZINDEX = 1000 //change this if you must
function ComboBox_init()
{
if (document.addEventListener) {
document.addEventListener("keyup", ComboBox_handleKey, false );
document.addEventListener("mousedown", ComboBox_mouseDown, false );
}
else if (document.attachEvent) {
document.attachEvent("onkeyup", function () { ComboBox_handleKey(window.event); } );
document.attachEvent("onmousedown", function () { ComboBox_mouseDown(window.event); } );
}
Global_run_event_hook = false;
}
function returnFalse(){return false}
function ComboBoxItem(text,value)
{
this.text = text;
this.value = value;
}
document.write(‘<link rel="STYLESHEET" type="text/css" href="ComboBox.css">‘)
ComboBox.css
.combo-button {
cursor: hand;
cursor: pointer;
height: 20px;
border: 1px solid rgb(120,172,255);
padding: 0;
background: rgb(234,242,255);
width: 14px;
vertical-align: baseline;
font-size: 8pt;
font-family: Webdings, Marlett;
}
.combo-hilite {
cursor: hand;
cursor: pointer;
background: rgb(234,242,255);
border: 1px solid rgb(120,172,255);
color: black;
font-family: verdana;
font-size: 9pt;
}
.combo-item {
cursor: hand;
cursor: pointer;
background: white;
border: 1px solid white;
color: black;
font-family: verdana;
font-size: 9pt;
}
.combo-input {
border: 1px solid rgb(120,172,255) !important;
width: 138px !important;
vertical-align: baseline;
}
.combo-list table {
table-layout: fixed;
width: 149px;
}
.combo-list {
border: 1px solid black;
background: white;
padding: 1px;
width: 149px;
/* enable this if you want scroll bars
height: 200px;
overflow: auto;
overflow-x: visible;
overflow-y: auto;
scrollbar-base-color: rgb(234,242,255);
scrollbar-highlight-color: rgb(234,242,255);
scrollbar-3dlight-color: rgb(120,172,255);
scrollbar-darkshadow-color: rgb(120,172,255);
scrollbar-shadow-color: rgb(234,242,255);
scrollbar-face-color: rgb(234,242,255);
scrollbar-track-color: white;
scrollbar-arrow-color: black;
*/
}
mark
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