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How do I call a javascript function from within a RequiredFieldValidator?

Posted on 2008-10-20
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Last Modified: 2010-04-21
I am working on asp.net web page. I want to replace a label with a RequiredFieldValidator message when an error occurs. To achieve this I want to call a javascript function from within the RequiredFieldValidator to trigger the replacement. Can this be done and if so how?
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Question by:xdubit
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M3mph15 earned 2000 total points
ID: 22765182
I think instead of using a RequiredFieldValidator you should use a CustomValidator and set the ClientValidationFunction to the Javascript function.

<asp:CustomValidator ID="CustomValidator1" runat="server" ErrorMessage="CustomValidator" ClientValidationFunction="ValidateControl();" ControlToValidate="YourControl"></asp:CustomValidator>

And then in the javascript function you can validate it. For example if it's a textbox your validating then check if the Length of its text is greater than 0. If not then replace Label with the CustomValidator.
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by:xdubit
ID: 31508126
That did the job. Thanks.
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