Custom validator not being checked on Update :s

[N3XuS]

I made a custom validator to check if there's items in a listbox. I have a whole bunch of other validators on the form so I don't wanna mix client and server side validation, and since the standard validators all are client side I want my custom one to be client side as well.
The only problem is ... the validator only validates when you actually click on an item in the listbox (in which case there is an item in the listbox obviously.) But when I submit the validator doesn't trigger ... the rest does though.
The javascript:

			<script language="javascript">

			function validateLength ( src, arg ) {
				alert(document.getElementById("lstLoc2").length);
				if (document.getElementById("lstLoc2").length > 0){
					arg.IsValid = true;
				}
			}
			</script>

The validator:

<asp:CustomValidator id="cvLocaties" runat="server" ErrorMessage="Geen locatie aangegeven" ControlToValidate="lstLoc2"
									ClientValidationFunction="validateLength"></asp:CustomValidator>

Why isn't the validator triggered like all the rest when I submit ?

 

[ca8msm]

Why aren't you just using a RequiredFieldValidator?


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[N3XuS]

Lol good question ... I looked over the listbox names .. though I couldn't use'm on listboxes ... Anyhow I found some areticle about how custom controls don't work for listboxes and ea checking if a checkbox is checked in a list. Go figure.