OnClientFileUploading

The OnClientFileUploading client-side event occurs when a file has starteduploading.

The event handler receives two parameters:

1. The instance of the RadAsyncUpload control firing the event.

2. An eventArgs parameter containing the following methods:

• get_row returns the row containing the file input field for the file that was just selected (<li> element)

• get_fileName returns the name of the file selected

• set_cancel cancel the upload process

ASPNET

<telerik:RadAsyncUpload RenderMode="Lightweight" runat="server" ID="RadAsyncUpload1" OnClientFileUploading="OnClientFileUploading"></telerik:RadAsyncUpload>

JavaScript

function OnClientFileUploading(sender, args) {
	alert(args.get_fileName().length);
	if (args.get_fileName().length > 20) {
		args.set_cancel(true);
	}
	else {
		args.set_cancel(false);
	}
}