RadUpload for ASP.NET AJAX
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RadControls for ASP.NET AJAX

You can use RadUpload with an ASP.NET custom validator. CustomValidator supports both client-side and server-side validation.

  • Validating client-side has the advantage that the CustomValidator prevents the page from submitting when there are selected files that the client-side validation function considers invalid. The validation function can use the validateExtensions() client-side method to validate file extensions on the client.

    Note

    Selected files must be transferred to the server before they can be validated for size or mime-type.

  • Validating server-side has the advantage that you can access file information such as size or mime-type, or even examine the file contents. The custom validator's ServerValidate event occurs after the RadUploadValidatingFile event and any integrated validation.

Caution

When using RadUpload with a CustomValidator, the validator's ControlToValidate property must not be set!

Example

The following example demonstrates using RadUpload with a custom validator to validate the extensions of selected files both client-side and server-side.

CopyASPX
<telerik:radupload id="RadUpload1" runat="server" allowedfileextensions=".zip,.jpg,.jpeg" />

<asp:CustomValidator runat="server" ID="CustomValidator1" Display="Dynamic" ClientValidationFunction="validateRadUpload1"
    OnServerValidate="CustomValidator1_ServerValidate">        
    Invalid extension.
</asp:CustomValidator>

<asp:Button runat="server" ID="Button1" Text="Submit" />

<script type="text/javascript">
    function validateRadUpload1(source, arguments) {
        arguments.IsValid = $find("<%= RadUpload1.ClientID %>").validateExtensions();
    }
</script>

 

See Also