How to use the BackendCancelableEvents() using this we can cancel a event or an option.

Using this event, we can cancel an event, or an option based on the event names and conditions.

Cancelable Events is a class that allows an operation to be canceled before it is completed.

In the Suite Commerce Extensibility API, most operations have a before and after event. The operation can be canceled before it is executed by creating a component listener that subscribes to the before event. Business logic in the listener can then throw an error or return a Deferred object in the rejected state.

For example, in CartComponent.js, the AddLine method is used to add a line to the cart. The beforeAddLine event occurs before the line is added and the afterAddLine events occurs after the line is added.

Examples

Canceling an option selection from a listener by throwing an error:

pdp_component.on('beforeOptionSelection', function()	{
	if(someCondition)
		throw new Error('Canceling select option.');
});
Copy

Canceling an option selection from a listener by returning a rejected promise:

pdp_component.on('beforeOptionSelection', function()	{
  if(someCondition)
     return jQuery.Deferred().reject(new Error('Canceling select option.'));
});