OnClientCommandExecuting

This event is fired just before a command is executed.

function OnClientCommandExecuting(editor, args)
editor	object	Returns a reference to RadEditor client object
args	object	Returns the needed information about the event

args parameter methods
args.get_commandName()	Returns the command name
args.get_value()	Returns the value of the executed tool
args.set_value()	Sets the new content to be pasted in RadEditor
args.get_cancel()	Returns Boolean value that indicates whether the event has been canceled or not.
args.set_cancel(true)	Cancels the command execution

The following example demonstrates how to alert the selected dropdown item name and value:

ASP.NET

<script type="text/javascript">
	function OnClientCommandExecuting(editor, args)
	{    
		//The command name    
		var commandName = args.get_commandName();               
		//The tool that initiated the command    
		var tool = args.get_tool();                   
		//The selected value [if command is coming from a dropdown]    
		var value = args.get_value();           

		//Perform some action     
		var message = "OnClientCommandExecuting.\nSelected value: " + value;                                           
		var answer = confirm(message + "\nExecute command " + commandName +"?");
		//Cancel the command execution by calling args.set_cancel(true);    
		args.set_cancel(!answer);
	}
</script>
<telerik:RadEditor RenderMode="Lightweight" runat="server" ID="RadEditor1" OnClientCommandExecuting="OnClientCommandExecuting">
</telerik:RadEditor>