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OnCommand

Telerik.Web.UI.GridCommandEventArgs OnCommand Property

To get or set property values for client API properties, you must call property accessor methods that are named with the get_ and set_ prefixes. For example, to get or set a value for a property such as cancel, you call the get_cancel or set_cancel.

This event will be raised for each grid command which is about to be triggered (sorting, paging, filtering, editing, etc.) before postback/ajax request except hierarchy/grouping expand/collapse action. The event can be intercepted in order to perform a certain operation in the grid via web service or to detect what type of command is raised on the client.

Fired byRadGrid
ArgumentscommandName - the name of the command which is about to be processed commandArgument - the command argument(s) value(s) tableView - returns reference to the owner TableView
Can be canceledYes, set eventArgs.set_cancel(true) to cancel

Example:

ASP.NET
<telerik:RadGrid RenderMode="Lightweight" ID="RadGrid1" runat="server">
    <ClientSettings>
        <ClientEvents OnCommand="RaiseCommand" />
    </ClientSettings>
</telerik:RadGrid>
JavaScript
function RaiseCommand(sender, eventArgs)
{
    //retrieve the current commandName and commandArgument
    var result = String.format("CommandName: {0}, CommandArgument: {1}", eventArgs.get_commandName(), eventArgs.get_commandArgument());

    if (<some_custom_condition_not_met>)
    {
        eventArgs.set_cancel(true); //cancel the command
    }
}

How to prevent loss of user input in batch editing mode

JavaScript
function OnCommand(sender, args) {
	var tableView = args.get_tableView();
	var batchEditingManager = sender.get_batchEditingManager();
	var isDirty = batchEditingManager.hasChanges(tableView);
	var commandName = args.get_commandName();
	//allow the user to cancel changes always
	//if there are changes allow the user only to save changes 
	var shouldAllowOperation = commandName == "RebindGrid" | | !(isDirty && commandName != "BatchEdit");
	args.set_cancel(!shouldAllowOperation);
	
}
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