It's too troublesome to get the value of a Drop-down box in JavaScript (dropdown box linkage)

Javascript| pull down in JS to get the value of the Drop-down box is really a lot of trouble, compared to the ASP. NET, it's a lot of trouble.


< HTML >
< head >
< title >List</title >
< meta http-equiv= "Content-type" content= "text/html; charset=gb2312 ">
< script language= "JavaScript" >
<!--
var Onecount;
onecount=0;

subcat = new Array ();
Subcat[0] = new Array ("Xuhui District", "01", "001");
SUBCAT[1] = new Array ("Jiading", "01", "002");
SUBCAT[2] = new Array ("Huangpu", "01", "003");
SUBCAT[3] = new Array ("Nanchang", "02", "004");
SUBCAT[4] = new Array ("Jiujiang", "02", "005");
SUBCAT[5] = new Array ("Shangrao", "02", "006");

onecount=6;

function Changelocation (LocationID)
{
document.myform.smalllocation.length = 0;

var Locationid=locationid;
var i;
Document.myform.smalllocation.options[0] = new Option (' = = = = = = ALL Regions = = = = '];
For (I=0;i < onecount; i++)
{
if (subcat[i][1] = = LocationID)
{
Document.myform.smalllocation.options[document.myform.smalllocation.length]
= new Option (subcat[i][0], subcat[i][2]);
}
}

}

-->
</script >
< BODY >
< form name= "MyForm" method= "POST" >
< select Name= "Biglocation"
>
< option value= "selected" > Shanghai </option >
< option value= "a" > Jiangxi </option >
</select >
< select Name= "Smalllocation" >
< option selected Value= "" >== All areas ==</option >
</select >
</form >
< script language= "JavaScript" >
<!--
Changelocation (Document.myform.biglocation.options[document.myform.biglocation.selectedindex].value);
-->
</script >
</body >