CheckBoxList Required Validation in Javascript

1. <asp:CheckBoxList ID="chkList" runat="server">
2. <asp:ListItem>Item Oneasp:ListItem>
3. <asp:ListItem>Item twoasp:ListItem>
4. <asp:ListItem>Item threeasp:ListItem>
5. <asp:ListItem>Item fourasp:ListItem>
6. asp:CheckBoxList>
7. <asp:Button ID="btnSubmit" runat="server" ValidationGroup="CHK" OnClientClick="return validateChk();" Text="Validate"/>

JAVASCRIPT CODE:

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1. function validateChk() {
2. debugger;
3. var found = false;
4. var validated = false;
5. var id = document.getElementById("").id;
6. var elements = document.forms[0].elements;
7. for (i = 0; i <>
8. if (elements[i].type == "checkbox" && elements[i].id.indexOf(id) > -1) {
9. found = true;
10. if (elements[i].checked) {
11. validated = true;
12. break;
13. }
14. }
15. }
16. if (found && validated)
17. return true;
18. else
19. return false;
21. }