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CustomValidaor and Client-side validation

Posted on 2009-04-13
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Last Modified: 2013-11-07
I have a text box that I need to run a custom validator on to make sure the max length isn't exceeded. The HTML for the TextBox and Validaor are below along with the Javascript validation function. I pretty much copied this out of an example on MSDN. it doesn't work. When I leave the TextBox I get a JS error: Microsoft JScript runtime error: 'Value.length' is null or not an object

Any help is greatly appreciated.
<asp:TextBox runat="server" ID="emer_phone_quantity" Width="30px" Height="20px" MaxLength="10" />
<asp:CustomValidator ID="CustomValidator1" runat="server" ErrorMessage="Phone Quantity length must be no greater than 10"
	Text="*" ControlToValidate="emer_phone_quantity" ClientValidationFunction="ValidateLength10" />
 
In the Page Head section:
 
	<script type="text/javascript">
 
		function ValidateLength10(args, event) {
 
			args.IsValid = (args.Value.length <= 10)
 
		}
 
	</script>

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Question by:rschaeferhig
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Expert Comment

by:HarryNS
ID: 24131087
Change you javascript function to this,

function ValidateLength10(oSrc,args) {
     
                  args.IsValid = (args.Value.length <= 10)
 
            }
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Accepted Solution

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HarryNS earned 1000 total points
ID: 24131131
The code I have given above will work fine. But you have already defined the maxlength of the text box as 10,
<asp:TextBox runat="server" ID="emer_phone_quantity" Width="30px" Height="20px" MaxLength="10" />

Then why do you want this custom validation to be done?
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Author Closing Comment

by:rschaeferhig
ID: 31569578
You're painfully right. I'm under a time constraint rewriting an ASP/VBScript app to .Net and I didn't even think about it. I just implemented what was in the original code...  Duhh..
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