Hi mchamo,
Please try the example below. Function "CuteWebUI_AjaxUploader_OnSelect" will fire before the uploader control postback to the server. So you can execute your own script code in it before the "FileUploaded" event.
<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title>Untitled Page</title>
</head>
<body>
<form id="form1" runat="server">
<CuteWebUI:Uploader ID="Uploader1" runat="server">
</CuteWebUI:Uploader>
</form>
</body>
</html>
<script>
function CuteWebUI_AjaxUploader_OnSelect(files)
{
alert("before postback!");
}
</script>
Regards,
ken