Angular CanDeactivate isn't working

Question

I'm trying to use the CanDeactivate function in the routing but canDeactivate function is never called when invoked on another route.

CanDeactivateGuard :

import { Injectable } from '@angular/core';
import { CanDeactivate } from '@angular/router';
import { Observable } from 'rxjs/Observable';

export interface CanComponentDeactivate {
  canDeactivate: () => Observable<boolean> | Promise<boolean> | boolean;
}

@Injectable()
export class CanDeactivateGuard implements  CanDeactivate<CanComponentDeactivate>{

  canDeactivate(component: CanComponentDeactivate) {
    return component.canDeactivate ? component.canDeactivate() : true;
  }
}

CatalogViewComponent :

import { Component } from '@angular/core';
import { Http } from '@angular/http';
import { Observable } from "rxjs";
import {CanComponentDeactivate} from '../../can-deactivate.guard';
@Component({
  selector: 'home',
  template: `
    <h1>Catalog</h1>
  `,
})
export class CatalogViewComponent implements CanComponentDeactivate{
  canDeactivate(): Observable<boolean> | boolean {
    console.log('working');  // Not Entering this function when invoked another route
    return false;
  }
}

routing.module.ts :

 { path: 'catalog', component: CatalogViewComponent, canDeactivate: CanDeactivateGuard },

Stackblitz Link

Answer 1

You need to pass the guard as an array. (You could have more than one.)

{ path: 'catalog', component: CatalogViewComponent, canDeactivate: [CanDeactivateGuard] }

and also add the guard as a provider:

providers: [CanDeactivateGuard],