ArticleZip > Angular 2 How To Redirect To 404 Or Other Path If The Path Does Not Exist Duplicate

Angular 2 How To Redirect To 404 Or Other Path If The Path Does Not Exist Duplicate

Have you ever wanted to redirect users to a custom path, like a 404 page, when they visit a URL that does not exist in your Angular 2 application? In this guide, we'll walk you through the steps to achieve just that - redirecting users to a specific path when a particular route cannot be found. Sometimes, users can end up on a non-existent page, maybe due to a mistyped URL or a deleted resource. By handling these scenarios gracefully with a redirect, you can enhance user experience and keep them engaged with your application.

The first thing you need to do is to create a custom Angular directive to handle the redirection logic. Let's name this directive `RedirectIfNotFound`. directives in Angular allow you to attach behavior to elements in the DOM. In our case, we want this directive to check if a particular URL path exists in our application and redirect the user accordingly.

Here's how you can create the `RedirectIfNotFound` directive:

Typescript

import { Directive, HostListener } from '@angular/core';
import { Router } from '@angular/router';

@Directive({
  selector: '[redirectIfNotFound]'
})
export class RedirectIfNotFoundDirective {

  constructor(private router: Router) {}

  @HostListener('window:popstate', ['$event'])
  checkPathExists(event: any): void {
      // Check if the current path exists in your application
      // If not, redirect to a custom path (e.g., a 404 page)
      if (!this.router.url.includes('your-custom-path')) {
          this.router.navigate(['/custom-path-not-found']);
      }
  }
}

In the code snippet above, we define a directive called `RedirectIfNotFound` that listens for the `popstate` event, which triggers when the user navigates back or forward in the browser history. Within the `checkPathExists` method, we check if the current path exists in our application using the `includes` function. If the path is not found, we use the `router.navigate` method to redirect the user to a custom path, in this case, `custom-path-not-found`.

Remember to add this directive to the declarations array of your Angular module to make it available throughout your application:

Typescript

declarations: [
  RedirectIfNotFoundDirective
]

Now that we have our custom directive set up, we need to add it to the element where we want the redirection behavior to take effect. Simply add the `redirectIfNotFound` attribute to the HTML element in your component template where you want this logic to apply.

Html

<div></div>

With this setup, whenever a user lands on a non-existent path in your Angular application, they will automatically be redirected to the custom path you specified in the directive. This simple yet effective technique can help improve user experience and ensure users don't get lost in your application.

In conclusion, by creating a custom Angular directive to handle path not found scenarios, you can seamlessly redirect users to relevant pages and enhance the overall user experience of your application. Experiment with different custom paths and redirection strategies to best suit your application's needs and keep users engaged and informed even when they navigate to non-existent URLs. Happy coding!

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