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Editorial Team
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Asked: 2026-05-30T23:08:48+00:00

I am trying to create a required field validation with a customvalidator. However when

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I am trying to create a required field validation with a customvalidator. However when the field is empty it still does a postback?

<body>
    <form id="Form1" runat="server">
    <h3>
        CustomValidator ServerValidate Example</h3>
    <asp:Label ID="Message" Font-Name="Verdana" Font-Size="10pt" runat="server" />
    <p>
        <asp:TextBox ID="Text1" runat="server" Text="[Name:required]" />
        &nbsp;&nbsp;
        <asp:CustomValidator ID="CustomValidator1" ControlToValidate="Text1" ClientValidationFunction="ClientValidate"
            Display="Static" ErrorMessage="" ForeColor="green" Font-Name="verdana" Font-Size="10pt"
            runat="server" />
        <p>
            <asp:Button ID="Button1" Text="Validate" OnClick="ValidateBtn_OnClick" runat="server" />
    </form>
</body>
</html>
<script language="javascript">
    function ClientValidate(source, arguments) {
        alert(arguments.Value.length);
        if (arguments.Value != "[Name:required]" && arguments.Value.length > 0) {
            arguments.IsValid = true;
        } else {
            arguments.IsValid = false;
        }
    }
</script>
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1 Answer

  1. Editorial Team

    Add ValidateEmptyText="True" to your CustomValidator tag

    See here for more details.

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