Question

如何使用js控制form表单中的select标签？

如果没有选择select中的值 提示用户选择，返回去让用户选择……麻烦知道的给写写，谢谢……

Answer 1

<form id="myform" >
<select name="month" id="month">
<option value="" selected="selected">请选择</option>
<option value="01">January</option>
<option value="02">February</option>
<option value="03" >March</option>
<option value="04">April</option>
</select>
<input type="submit" />
</form>

<script language="javascript">

<!--
var myForm = document.getElementById("myform");
var slct = document.getElementById("month");

function check()
{
alert(!!slct.value);
if(!slct.value){ alert("请选择"); return false}else{ return true;}
}

myForm.onsubmit=function (){return check();}

-->
</script>