Angular 2 trigger event

Question

I am trying to trigger a click event on another element but it doesn't work.

My Component:

import {Component, Output, EventEmitter} from 'angular2/core';

@Component({
  selector: 'generate-car',
  template: `
    <button [disabled]="!pressed" (click)="parkingCar()"  type="button"  class="parking">Parking Car</button>
    <car *ngFor="#car of cars" [class]="car.type" (animate)="test()">
        <span class="car-number">{{car.id}}</span>
    </car>
`
})

When I click on the button I need to trigger (animate) event.

My class:

export class GenerateCar {

@Output() animate = new EventEmitter();

parkingCar() {
    this.animate.emit(null)
}

test() {
    console.log( 111 )
}

}

micronyks · Answer 1 · 2016-02-15T06:30:03.783

I think set up is not correct or something.

You need to understand the concept of EventEmitter of Angular2. It allows you to fire custom event of DOM element and propagate it to its parent.

I don't understand what you would like to do with EventEmitter with your example. But I'd like to give you a direction which might help you in your example.

EventEmitter very simple example

boot.ts

@Component({
selector: 'my-app',
directives:[Car], 
template: `
    <div>{{name}} from parent</div><br>
    <car (animate)="test($event)"></car><bR>
        `
, 
})

export class BodyContent {  //ParentComponent

    name:string='Angular1';

      test(arg) {
          console.log('test start');
          //this.animate.subscribe((value) => { this.name = value; });
          this.name=arg;
          console.log(arg);
        }
    }
,
})

car.ts

export class Car {
      @Output() animate: EventEmitter = new EventEmitter();

      setValue()
      {
        console.log('setValue strat');
        this.animate.next('angular2');

        // You can also write below line in place of above line
        //this.animate.emit('Angular2');
      }
}

Working Plunker

Note: (animate) = "test($event): It will tell Angular to invoke the ParentComponent's test($event) method when ChildComponent(car) fires animate. The data that we passed to the “next()” method in caris available in ParentComponent by passing $event as an argument to the test() method.

For further information you can refer to this nice article.

Hope this will help you to go further.

Angular 2 trigger event

1 Answers1