/Javascript/AngularJS/Angular event emitter

Angular event emitter

  @Output() open: EventEmitter<any> = new EventEmitter();


  toggel() {
  	this.open.emit(null);
  }

Source: angular.io

Eventemitter in angular

So, how to use it properly?
Simply use it to emit events from your component. Take a look a the following example.

@Component({
    selector : 'child',
    template : `
        <button (click)="sendNotification()">Notify my parent!</button>
    `
})
class Child {
    @Output() notifyParent: EventEmitter<any> = new EventEmitter();
    sendNotification() {
        this.notifyParent.emit('Some value to send to the parent');
    }
}

@Component({
    selector : 'parent',
    template : `
        <child (notifyParent)="getNotification($event)"></child>
    `
})
class Parent {
    getNotification(evt) {
        // Do something with the notification (evt) sent by the child!
    }
}
How not to use it?
class MyService {
    @Output() myServiceEvent : EventEmitter<any> = new EventEmitter();
}
Stop right there... you're already wrong...

Source: stackoverflow.com

What does event emitter do in angular

Data flows into your component via property bindings and flows out of your component through event bindings. If you want your component to notify his parent about something you can use the Output decorator with EventEmitter to create a custom event.

Similar codes

0 vote135 views1 answer
Angular int to string
Javascript AngularJS
0 vote125 views1 answer
Documentation tool for angular applications
Javascript AngularJS
0 vote113 views1 answer
How to update angular core in ionic
Javascript AngularJS
0 vote118 views1 answer
How can i use two api at the same time in angular
Javascript AngularJS
0 vote148 views1 answer
Await in angular 8
Javascript AngularJS
0 vote131 views2 answers
Unknown Provider angularjs
Javascript AngularJS
0 vote118 views1 answer
You seem to not be depending on "@angular/core" and/or "rxjs". This is an error.
Javascript AngularJS
9 votes129 views1 answer
Angular ERROR Error: ExpressionChangedAfterItHasBeenCheckedError: Expression has changed after it was checked.
Javascript AngularJS
3 votes158 views4 answers
Router-outlet' is not a known element angular
Javascript AngularJS
0 vote125 views1 answer
Warn user before leaving page angular
Javascript AngularJS