JS判断CheckBoxList是否未选中

<script type= "text/javascript ">

function btnClick()

{

var list = document.getElementById( "chkList ");

var j = 0;

for(var i = 0 ; i < list.rows.length;i++)

{

var chk = list.rows[i].childNodes[0].childNodes[0];

if (chk.checked)

{

j++;

}

}

return (j > 0);

}

另一种方法:

var flag1=0;

var checkobj = document.getElementById("CheckBoxList1");

var checks = checkobj.getElementsByTagName("input");

for(var n=0;n<checks.length;n++)

{

if(checks
.type=="checkbox" && checks
.checked==true)

{

flag1=1;

}

}

if(flag1==0)

{

alert("请选择栏目设置！");

return false;

}

</script>