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[Angular Directive] Build a Directive that Tracks User Events in a Service in Angular 2
A @Directive is used to add behavior to elements and components in your application. This makes @Directives ideal for behaviors such as "tracking" which don‘t belong in a Component, but do belong as a behavior in your application.
import {Directive, HostListener, Input} from ‘@angular/core‘;import {TrackingService} from "../services/tracking.service";@Directive({ selector: ‘[track]‘})export class TrackDirective { @Input() track; constructor(private trackingService: TrackingService) { } @HostListener(‘click‘, [‘$event‘]) onClick(event) { this.trackingService.tracking( event, this.track ) }}
import { Injectable } from ‘@angular/core‘;@Injectable()export class TrackingService { logs = []; constructor() { } tracking(event, log) { this.logs.push({ event, log }); console.log(this.logs) }}
<button [track]="‘one is clicked‘">One</button><button [track]="‘two is clicked‘">Two</button><button [track]="‘three is clicked‘">Three</button>
[Angular Directive] Build a Directive that Tracks User Events in a Service in Angular 2
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