CheckboxList required field validation

Today I came across a situation where I need to validate CheckboxList as required field and found below solution:

//Bound list from Database
<asp:CheckBoxList ID="chlZones" runat="server" RepeatColumns="5" 
RepeatDirection="Horizontal" />
//Create Custom validator that will work as required validator. Profile function
<asp:CustomValidator ID="cvalZones" runat="server" 
ClientValidationFunction="ValidateZones" ErrorMessage="!!!" 
Display="Dynamic" />

//Implement Client method
function ValidateZones(source, args) {
		var chlZones = document.getElementById('');
		var chkLista = chlZones.getElementsByTagName("input");
		for (var i = 0; i < chkLista.length; i++) {
			if (chkLista[i].checked) {
				args.IsValid = true;
		args.IsValid = false;
Tagged with: ,
Posted in Asp.Net
8 comments on “CheckboxList required field validation
  1. Arun says:

    good one 🙂

  2. Philosopher says:

    This one is FREE, comes with source code, and is just like the other .NET controls – drop it on a page, pick the checkbox list control to validate and you get client side and server side validation. It also works with AJAX. It even lets you pick a minimum and maximum number of checkboxes that have to be checked or can be checked.

  3. bas says:

    working fine while unchecked the checklist box items..but after checked also it continously showing this validation..plz correct it

  4. Hi,

    This is very informative article. Thanks for sharing your knowledge. There are few links that also helpful for developers. This article have described to validate CheckBox, CheckBoxList, DropDownList, FileUpload, RadioButton, RadioButtonList, TextBox using jquery.

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