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JS Dynamic hint dropdown box

Source: Internet
Author: User
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<html>


<head>


<meta http-equiv= "Content-type content=" HTML; charset=gb2312 ">


<meta content= "Fason, a letter" name=author>


<title>js dynamic hint dropdown box </title>


<style>


a{color:red;text-decoration:none;font-size:12px}


</style>


</head>


<body onload= "Init ()" >


<center>


<h2>js dynamic hint dropdown box </h2>


<hr>


<form name=frm>


<table>


<tr>


<td> Please enter 1 or 2 or 3 or 4 or 5 to test: <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= "a" >12</option>


<option value= "123" >123</option>


<option value= "1234" >1234</option>


<option value= "2" >2</option>


<option value= >23</option>


<option value= "234" >234</option>


<option value= "2345" >2345</option>


<option value= "3" >3</option>


<option value= >34</option>


<option value= "345" >345</option>


<option value= "3456" >3456</option>


<option value= "5" >5</option>


<option value= "Wuyi" >51</option>


<option value= "51w" >51w</option>


<option value= "51wi" >51wi</option>


<option value= "51win" >51win</option>


<option value= "51windows" >51windows</option>


</select></span>


</td>


</tr>


</form>


</table>


<hr>


<script language= "JavaScript" >


var temparr=[];//storage Option

function Init () {
var selectobj=document.frm.elements["Demo"]
/* First store the data in an array * *
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++)
 if (Temparr[i][0].indexof (txtobj.value) ==0| | Flag)//if found with the content of txt beginning, add option. If flag is true, initializes the
 arr[arr.length]= <option value= ' +temparr[i][1]+ ' > ' +temparr[i][0]+ ' to the dropdown box </ Option> "
 innerhtml=selecthtml+arr.join () +" </SELECT> "
}
}
</script>
</ Body>

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