<select name=s>
<option selected >a</option>
<option>b</option>
<option>c</option>
<option>d</option>
</select>
<input type=button value=check onclick="alert(isChecked(s,'c'))"> </body>
<script>
function isChecked(obj,value){
return (obj.options[obj.selectedIndex].text==value)
}
</script>
<option selected >a</option>
<option>b</option>
<option>c</option>
<option>d</option>
</select>
<input type=button value=check onclick="alert(isChecked(s,'c'))"> </body>
<script>
function isChecked(obj,value){
return (obj.options[obj.selectedIndex].text==value)
}
</script>
<select name="biglocation" ID=Select1 onchange="alert('第'+document.myform.biglocation.selectedIndex+'选择.')">
<option value="1" selected>上海</option>
<option value="2">江西</option>
</select>
</form>
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
<SCRIPT LANGUAGE="JavaScript">
<!--
function cc()
{
var a = document.all.aa.options;
for(var i=0;i<a.length;i++)
{
if(a[i].selected)
{
alert(a[i].text);
}
}
}
//-->
</SCRIPT>
</HEAD><BODY>
<select name="aa" multiple>
<option>1</option>
<option>2</option>
<option>3</option>
</select><input type="button" value="click" onclick="cc()">
</BODY>
</HTML>
<select name="biglocation" ID=Select1>
<option value="1" selected>上海</option>
<option value="2">江西</option>
</select>
</form>
function isChecked(obj,value){
return (obj.options[obj.selectedIndex].text==value)
}
选中c时,alert:true;否则false;
function isChecked(obj,value){
return (obj.options[obj.selectedIndex].text==value)
}在你提交的button或者img上写一个onclick="isChecked(你的列表名,你要选中的值)"
如果返回了false,你的表单就提交不了了。
<form action="shyslysky.htm">
<select name=s>
<option selected >a</option>
<option>b</option>
<option>c</option>
<option>d</option>
</select>
<input type=submit onclick="alert(isChecked(s,'c'))">
</form>
</body>
<script>
function isChecked(obj,value){
return (obj.options[obj.selectedIndex].text==value)
}
</script>