标签:style blog color io os java ar for div
需要注意的是当需要动态添加项的时候一定要
先var newoption=new Option("项","值");
然后再 select.options.add(newoption);
这样才能添加进去
代码如下:
<html> <head> <script language="javascript"> function changeSever() { var newop1,newop2; //声明两个变量用来添加Option项 switch(document.form1.select1.value) //判断选择的项,注意这里是值不是所选的项,是所选项的值 { case "lt": newop1=new Option("雷霆1区","lt1"); newop2=new Option("雷霆2区","lt2"); break; case "ty": newop1=new Option("天涯1区","lt1"); newop2=new Option("天涯2区","lt2"); break; } document.form1.select2.options.length=0; //把所有的项清空 document.form1.select2.options.add(new Option("请选择相应的服务器")); document.form1.select2.options.add(newop1); //添加项 document.form1.select2.options.add(newop2); } </script> </head> <body> <form name="form1" method="post" action=""> <select name="select1" onChange="changeSever()"> //父下拉框 <option selected>请选择所在区</option> <option value="lt">雷霆</option> <option value="ty">天涯</option> </select> <p><select name="select2"> //子下拉框 <option>请选择服务器</option> </select> </form> </body> </html>
标签:style blog color io os java ar for div
原文地址:http://www.cnblogs.com/xyyt/p/3980071.html