OnDestroy

Implement this interface to get notified when your directive is destroyed.

ngOnDestroy callback is typically used for any custom cleanup that needs to occur when the instance is destroyed

Examples

Try this live example from the Lifecycle Hooks page:

// Spy on any element to which it is applied. // Usage: <div mySpy>...</div> @Directive(selector: '[mySpy]') class SpyDirective implements OnInit, OnDestroy { final LoggerService _logger; SpyDirective(this._logger); ngOnInit() => _logIt('onInit'); ngOnDestroy() => _logIt('onDestroy'); _logIt(String msg) => _logger.log('Spy #${_nextId++} $msg'); }