Hi
So many time we will get scenario to read the checkbox list using JavaScript, we can do this task like this
<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default3.aspx.vb" Inherits="Test_Default3" %>
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc1" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<script type="text/javascript">
function getCheckBoxListItemsChecked(elementId) {
var elementRef = document.getElementById(elementId);
var checkBoxArray = elementRef.getElementsByTagName('input');
var checkedValues = '';
for (var i = 0; i < checkBoxArray.length; i++) {
var checkBoxRef = checkBoxArray[i];
if (checkBoxRef.checked == true) {
// for getting the value
var value1 = checkBoxArray[i].value;
alert(value1)
// For getting the text value
var labelArray = checkBoxRef.parentNode.getElementsByTagName('label');
if (labelArray.length > 0) {
if (checkedValues.length > 0)
checkedValues += ', ';
checkedValues += labelArray[0].innerHTML;
}
}
}
return checkedValues;
}
function readCheckBoxList() {
var checkedItems = getCheckBoxListItemsChecked('<%= CheckBoxList2.ClientID %>');
alert(checkedItems);
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:CheckBoxList ID="CheckBoxList2" runat="server">
<asp:ListItem>C1</asp:ListItem>
<asp:ListItem>C2</asp:ListItem>
</asp:CheckBoxList>
</div>
<input type="button" onclick="readCheckBoxList();" value="Read CheckBoxList" />
</form>
</body>
</html>
Chandradev's Blog 
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