var nodelist = document.getElementsByTagName("option");
for(var i = 0; i<nodelist.length; i++){
if(nodelist[i].value == "b"){
nodelist[i].selected = true;
}
}
for(var i = 0; i<nodelist.length; i++){
if(nodelist[i].value == "b"){
nodelist[i].selected = true;
}
}
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<script>
window.onload = function(){
var osel = document.getElementsByTagName('select')[0];
osel.options[1].selected = true;
} </script>
</HEAD> <BODY>
<select>
<option value='a'>aaa </option>
<option value='b'>bbb </option>
<option value='c'>ccc </option>
</select>
</BODY>
</HTML>
<option value='a'>a </option>
<option value='b'>b </option>
<option value='c'>c </option>
</select><script type="text/javascript">
var n=document.getElementById("a").options
for(var i=0;i<n.length;i++){
if(n[i].value=="b"){
document.getElementById("a").selectedIndex=i
}
}
</script>
<option value='a'>aaa </option>
<option value='b'>bbb </option>
<option value='c'>ccc </option>
</select>
<SCRIPT LANGUAGE="JavaScript">
var xx=document.getElementById('test');
for(var i = 0; i <xx.length; i++){
if(xx[i].value == "b"){
xx[i].selected = true;
}
}
</SCRIPT>
var nodelist = document.getElementsByTagName("option");
for(var i = 0; i <nodelist.length; i++){
if(nodelist[i].getAttribute("value") == "b"){
nodelist[i].selected = true;
}
}