API Reference > bentleyjs-core > Events > BeUiEvent BeUiEvent<TEventArgs> Class Specialization of BeEvent for events that take a single strongly typed argument, primarily used for UI events. Extends BeEvent<(args: TEventArgs) => void> Methods Name Description constructor<TEventArgs>(): BeUiEvent<TEventArgs> emit(args: TEventArgs): void Raises event with single strongly typed argument. Inherited methods Name Inherited from Description addListener(listener: (args: TEventArgs) => void, scope?: any): () => void BeEvent<(args: TEventArgs) => void> Registers a Listener to be executed whenever this event is raised. addOnce(listener: (args: TEventArgs) => void, scope?: any): () => void BeEvent<(args: TEventArgs) => void> Registers a callback function to be executed only once when the event is raised. clear(): void BeEvent<(args: TEventArgs) => void> Clear all Listeners from this BeEvent. has(listener: (args: TEventArgs) => void, scope?: any): boolean BeEvent<(args: TEventArgs) => void> Determine whether this BeEvent has a specified listener registered. raiseEvent(...args: [args]): void BeEvent<(args: TEventArgs) => void> Raises the event by calling each registered listener with the supplied arguments. removeListener(listener: (args: TEventArgs) => void, scope?: any): boolean BeEvent<(args: TEventArgs) => void> Un-register a previously registered listener. Inherited properties Name Type Inherited from Description numberOfListeners Accessor ReadOnly number BeEvent<(args: TEventArgs) => void> The number of listeners currently subscribed to the event. Defined in core/bentley/src/BeEvent.ts Line 133 Last Updated: 11 June, 2024