动态提示的下拉框
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<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<META content="yuanhotel,老袁" name=Author>
<title>动态提示的下拉框</title>
<style>
a{color:red;text-decoration:none;font-size:12px}
</style>
</head>
<body onload="Init()">
<center>
<h2>动态提示的下拉框</h2>
<hr>
<form name=frm>
<table>
<tr>
<td>请输入1或2或3或4或5或我或我爱进行测试：<br><input
name="txt" style="width:100px" onkeyup="SelectTip(0)"> <input
type="button" value="reset" onclick="SelectTip(1)"></td>
</tr>
<tr>
<td>
<span id="demo"><select name="demo" style="width:100px" size=10
onchange="txt.value=options[selectedIndex].text;">
<option value="1">1</option>
<option value="12">12</option>
<option value="123">123</option>
<option value="1234">1234</option>
<option value="2">2</option>
<option value="23">23</option>
<option value="234">234</option>
<option value="2345">2345</option>
<option value="3">3</option>
<option value="34">34</option>
<option value="345">345</option>
<option value="3456">3456</option>
<option value="5">5</option>
<option value="51">51</option>
<option value="51w">51o</option>
<option value="51wi">51op</option>
<option value="51win">51opt</option>
<option value="51windows">51option</option>
<option value="I">我</option>
<option value="I love">我爱</option>
<option value="I love her">我爱他</option>
<option value="I love you">我爱你</option>
</select></span>
</td>
</tr>
</form>
</table>
<hr>
<script language="javascript">
//存贮option
var TempArr=[];
function Init(){
var SelectObj=document.frm.elements["demo"]
/*先将数据存入数组*/
with(SelectObj)
for(i=0;i<length;i++)TempArr[i]=[options[i].text,options[i].value]
}
function SelectTip(flag){
var TxtObj=document.frm.elements["txt"]
var SelectObj=document.getElementById("demo")
var Arr=[]
with(SelectObj){
var SelectHTML=innerHTML.match(/<[^>]*>/)[0]
for(i=0;i<TempArr.length;i++)
//若找到以txt的内容开头的，添option。若flag为true,对下拉框初始化
if(TempArr[i][0].indexOf(TxtObj.value)==0||flag)
Arr[Arr.length]="<option
value='"+TempArr[i][1]+"'>"+TempArr[i][0]+"</option>"
innerHTML=SelectHTML+Arr.join()+"</SELECT>"
}
}
</script>
</body>