Is there a way to identify when a user is returning to a previous page in Angular2

Question

Is there a way to identify when a user is returning to a previous page in Angular2

How can I detect if a user has pressed the back button in their browser to navigate back while using Angular?

Currently, I am subscribing to router events to achieve this.

constructor(private router: Router, private activatedRoute: ActivatedRoute) {

    this.routerSubscription = router.events
        .subscribe(event => {

            // if (event.navigatesBack()) ...

        });

}

Although I am aware that I can use window.onpopstate to achieve the same result, it feels like a workaround when working with Angular2.

angular typescript angular2-routing

Answer 1

Answer №1

UPDATE Kindly refrain from doing this.

The official documentation explicitly states, "This class should not be used directly by developers. Instead, utilize Location." Reference: https://angular.io/api/common/PlatformLocation

You can opt for utilizing PlatformLocation which features the onPopState listener.

import { PlatformLocation } from '@angular/common'

(...)

constructor(location: PlatformLocation) {

    location.onPopState(() => {

        console.log('back button pressed!');

    });

}

(...)

Answer 2

UPDATE Kindly refrain from doing this.

The official documentation explicitly states, "This class should not be used directly by developers. Instead, utilize Location." Reference: https://angular.io/api/common/PlatformLocation

You can opt for utilizing PlatformLocation which features the onPopState listener.

import { PlatformLocation } from '@angular/common'

(...)

constructor(location: PlatformLocation) {

    location.onPopState(() => {

        console.log('back button pressed!');

    });

}

(...)

Answer 3

Answer №2

In my opinion, a more efficient approach to listening for popstate events is to utilize the location service subscription.

import {Location} from "@angular/common";

constructor(private location: Location) { }

ngOnInit() {
    this.location.subscribe(x => console.log(x));
}

This method avoids using PlatformLocation directly (as recommended in the documentation) and allows for easy unsubscribing whenever necessary.

Answer 4

In my opinion, a more efficient approach to listening for popstate events is to utilize the location service subscription.

import {Location} from "@angular/common";

constructor(private location: Location) { }

ngOnInit() {
    this.location.subscribe(x => console.log(x));
}

This method avoids using PlatformLocation directly (as recommended in the documentation) and allows for easy unsubscribing whenever necessary.

Answer 5

Answer №3

import { HostListener } from '@angular/core';

To capture the event when the back button is pressed, we can listen for the popstate event on the window object:

  @HostListener('window:popstate', ['$event'])
  onPopState(event) {
    console.log('Back button pressed');
  }

This particular code snippet has been successfully tested on the most recent version of Angular 2.

Answer 6

import { HostListener } from '@angular/core';

To capture the event when the back button is pressed, we can listen for the popstate event on the window object:

  @HostListener('window:popstate', ['$event'])
  onPopState(event) {
    console.log('Back button pressed');
  }

This particular code snippet has been successfully tested on the most recent version of Angular 2.

Answer 7

Answer №4

Don't rely on PlatformLocation according to thorin87's answer. Remember to subscribe and unsubscribe properly.

import {Subscription} from 'rxjs/Subscription';    

ngOnInit() {
  this.subscription = <Subscription>this
    .location
    .subscribe(() => x => console.log(x));
}

ngOnDestroy() {
  this.subscription.unsubscribe();
}

Answer 8

Don't rely on PlatformLocation according to thorin87's answer. Remember to subscribe and unsubscribe properly.

import {Subscription} from 'rxjs/Subscription';    

ngOnInit() {
  this.subscription = <Subscription>this
    .location
    .subscribe(() => x => console.log(x));
}

ngOnDestroy() {
  this.subscription.unsubscribe();
}

Answer 9

Answer №5

When using Angular version 8 and above:

constructor(private readonly router: Router) {
this.router.events
  .pipe(filter((event) => event instanceof NavigationStart))
  .subscribe((event: NavigationStart) => {
    if (event.restoredState) {
      this.isBackUrl = true;
    }
  });

}

Answer 10

When using Angular version 8 and above:

constructor(private readonly router: Router) {
this.router.events
  .pipe(filter((event) => event instanceof NavigationStart))
  .subscribe((event: NavigationStart) => {
    if (event.restoredState) {
      this.isBackUrl = true;
    }
  });

}

Answer 11

Answer №6

This code snippet is compatible with all versions of Angular.

import { PlatformLocation } from '@angular/common';

constructor(private _location: PlatformLocation) {

this._location.onPopState(() => {
 `enter code here` // Add your custom pop-up display logic here.

 // window.location.href = 'https://www.google.com'; // Redirect to another page when browser back button is clicked.

});

Answer 12

This code snippet is compatible with all versions of Angular.

import { PlatformLocation } from '@angular/common';

constructor(private _location: PlatformLocation) {

this._location.onPopState(() => {
 `enter code here` // Add your custom pop-up display logic here.

 // window.location.href = 'https://www.google.com'; // Redirect to another page when browser back button is clicked.

});

Is there a way to identify when a user is returning to a previous page in Angular2

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

Answer №6

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