javascript中取得下拉框的值太麻烦下拉框联动

javascript中取得下拉框的值太麻烦下拉框联动

在 JS中获取下拉框的值真是要费很多周章，比起在ASP。NET中来就麻烦多了 < 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("徐汇区","01","001"); subcat[1] = new Array("嘉定区","01","002"); subcat[2] = new Array("黄浦区","01","003"); subcat[3] = new Array("南昌市","02","004"); subcat[4] = new Array("九江市","02","005"); subcat[5] = new Array("上饶市","02","006"); onecount=6; function changelocation(locationid)     {     document.myform.smalllocation.length = 0;      var locationid=locationid;     var i;     document.myform.smalllocation.options[0] = new Option('====所有地区====','');     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 > < /head > < body > < form name="myform" method="post" >     < select name="biglocation"  onChange="changelocation(document.myform.biglocation.options[document.myform.biglocation.selectedIndex].value)" >         < option value="01" selected >上海< /option >         < option value="02" >江西< /option >     < /select >     < select name="smalllocation" >          < option selected value="" >==所有地区==< /option >     < /select > < /form > < script LANGUAGE="javascript" >  < !--      changelocation(document.myform.biglocation.options[document.myform.biglocation.selectedIndex].value);  //-- >  < /script > < /body > < /html >