public string OnClientValidationFailed { get; set; }

Public Property OnClientValidationFailed As String
	Get
	Set

public:
property String^ OnClientValidationFailed {
	String^ get ();
	void set (String^ value);
}

member OnClientValidationFailed : string with get, set

Property Value

If specified, the onClientValidationFailed client-side event is called when a file has invalid extension or its size exceeds the maximum allowed size

• sender, the async upload client object;
• eventArgs with two properties:
  • get_fileName(), the name of the file that failed to upload.
  • get_fileInputField(), the file input field dom element.

This event cannot be cancelled.

<script type="text/javascript">
function onClientValidationFailed(sender, eventArgs)
{
var fileName = eventArgs.get_fileName();
var input = eventArgs.get_fileInputField();
}
</script>

<kettic:KaxAsyncUpload ID="KaxAsyncUpload1"
runat="server"
OnClientValidationFailed="onClientValidationFailed">
....
</kettic:KaxAsyncUpload>

Reference