"Back button directive Angular" Code Answer's

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Back button directive Angular

Hilarious Hyena on May 14, 2021

/** Navigation service ***/

import { Injectable } from '@angular/core'
import { Location } from '@angular/common'
import { Router, NavigationEnd } from '@angular/router'

@Injectable({ providedIn: 'root' })
export class NavigationService {
  private history: string[] = []

  constructor(private router: Router, private location: Location) {
    this.router.events.subscribe((event) => {
      if (event instanceof NavigationEnd) {
        this.history.push(event.urlAfterRedirects)
      }
    })
  }

  back(): void {
    this.history.pop()
    if (this.history.length > 0) {
      this.location.back()
    } else {
      this.router.navigateByUrl('/')
    }
  }
}


/** create directive ****/

import { Directive, HostListener } from '@angular/core'
import { NavigationService } from './navigation.service'

@Directive({
  selector: '[backButton]',
})
export class BackButtonDirective {
  constructor(private navigation: NavigationService) {}

  @HostListener('click')
  onClick(): void {
    this.navigation.back()
  }
}

/*** use below code to use directive **/

<button backButton>Back with NavigationService</button>

Source: nils-mehlhorn.de

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"Back button directive Angular" Code Answer's