check box list validation in javascript

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show a javascript alert if no checkboxlist was checked in a form, you need to validate the checked property of that checkboxlist. By using the onSubmit event of the form and a JS function .can validate form correctly.

Posted 25-Sep-12 18:48pm

rosren

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mksharma38 · Answer 1 · 2012-09-25T19:24:00

Sample HTML

XML

<asp:CheckBoxList ID="CheckBoxList1" runat="server">
        <asp:ListItem>a</asp:ListItem>
        <asp:ListItem>b</asp:ListItem>
        <asp:ListItem>c</asp:ListItem>
        </asp:CheckBoxList>
        <asp:Button ID="Button1" runat="server" Text="Button" OnClientClick="return ValidateCheckBoxList()" />

Sample Javascript

C#

<script>
       function ValidateCheckBoxList() {

           var listItems = document.getElementById("CheckBoxList1").getElementsByTagName("input");
           var itemcount = listItems.length;
           var iCount = 0;
           var isItemSelected = false;
           for (iCount = 0; iCount < itemcount; iCount++)
           {
               if (listItems[iCount].checked)
               {
                   isItemSelected = true;
                   break;
               }
           }
           if (!isItemSelected) {
               alert("Please select an Item.");
           }
           else {
               return true;
           }
           return false;
       }
   </script>

Abhijit Parab · Answer 2 · 2012-09-25T19:18:00

C#

function chkselect() {
    var cnt = 0;
    for (var i = 50; i < document.CtrlForm.elements.length; i++) {

        if (document.CtrlForm.elements[i].type == 'checkbox') {

            if (document.CtrlForm.elements[i].checked == true) {
                cnt++;
            }
        }
    }
    if (cnt == 0) {
        document.getElementById('lblError').innerHTML = 'Atleast 1 Request Should be Selected..';
        return false;
    }
}

anhtai8z · Answer 3 · 2013-10-06T22:06:00

Solution 3

[]

Posted 6-Oct-13 22:06pm

anhtai8z

check box list validation in javascript

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