Delegation: EventEmitter or Observable in Angular

by

I am trying to implement something like a delegation pattern in Angular.
When the user clicks on a nav-item, I would like to call a function which then emits an event which should in turn be handled by some other component listening for the event.

Here is the scenario: I have a Navigation component:

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

@Component({
    // other properties left out for brevity
    events : ['navchange'], 
    template:`
      <div class="nav-item" (click)="selectedNavItem(1)"></div>
    `
})

export class Navigation {

    @Output() navchange: EventEmitter<number> = new EventEmitter();

    selectedNavItem(item: number) {
        console.log('selected nav item ' + item);
        this.navchange.emit(item)
    }

}

Here is the observing component: 

export class ObservingComponent {

  // How do I observe the event ? 
  // <----------Observe/Register Event ?-------->

  public selectedNavItem(item: number) {
    console.log('item index changed!');
  }

}

The key question is, how do I make the observing component observe the event in question ?

7 Answers
7

Leave a Comment