Different Angular 2 components are resolved by routes

Question

Different Angular 2 components are resolved by routes

Consider this scenario:

Upon navigating to the URL /product/123, the goal is to display the ProductComponent.

This is how it's currently configured:

RouterModule.forRoot([            
        {
            path: 'product/:productId',
            component: ProductComponent
        },
        {
            path: '**', component: NotFoundComponent
        },
    ]),

Recently, a resolver has been incorporated to verify the existence of the product ID. The updated setup appears as follows:

RouterModule.forRoot([            
        {
            path: 'product/:productId',
            component: ProductComponent,
            resolver: {
                productResolver: ProductResolver
            }
        },
        {
            path: '**', component: NotFoundComponent
        },
    ]),

The resolver conducts an API call to confirm the existence of the productId parameter. However, if the productId is not found, the preference is to load the NotFoundComponent instead of redirecting to a different page (without altering the URL, contrary to Angular 2 documentation).

Does anyone have insights on achieving this? How can we have the NotFoundComponent loaded without changing the URL or engaging in navigation when the productId is not located via the resolver?

javascript angular typescript angular2-routing

Answer 1

Answer №1

When you want to navigate to your NotFoundComponent without changing the location, there are a few different approaches you can take. If you have injected the Router into your resolver and need to handle the scenario where the ID does not exist:

router.navigate(['someUrl']);

You could also consider using the navigateByUrl method. Whichever route you choose, you have the option to prevent the URL from being changed by informing the router with this guide on how to not alter the URL:

router.navigate(['someUrl'], {skipLocationChange: true});

Answer 2

When you want to navigate to your NotFoundComponent without changing the location, there are a few different approaches you can take. If you have injected the Router into your resolver and need to handle the scenario where the ID does not exist:

router.navigate(['someUrl']);

You could also consider using the navigateByUrl method. Whichever route you choose, you have the option to prevent the URL from being changed by informing the router with this guide on how to not alter the URL:

router.navigate(['someUrl'], {skipLocationChange: true});

Answer 3

Answer №2

To avoid loading your component via router settings, it's best to include it within the Component that attempts to retrieve data from the service. If no data is returned, you can then toggle a boolean variable to control whether the NotFoundComponent is displayed. Here's some example pseudo code:

ngOnInit(){
    if (this.route.snapshot.params && this.route.snapshot.params['id']){
          myService.getTheThingById((success)=>{
                this.isFound = true;
                },(err)=> {
                      this.isFound = false;
          });
}

If your NotFoundComponent has a selector like 'not-found-component', add it to the template of the component calling the service.

 <not-found-component *ngIf='!isFound'></not-found-component>

Answer 4

To avoid loading your component via router settings, it's best to include it within the Component that attempts to retrieve data from the service. If no data is returned, you can then toggle a boolean variable to control whether the NotFoundComponent is displayed. Here's some example pseudo code:

ngOnInit(){
    if (this.route.snapshot.params && this.route.snapshot.params['id']){
          myService.getTheThingById((success)=>{
                this.isFound = true;
                },(err)=> {
                      this.isFound = false;
          });
}

If your NotFoundComponent has a selector like 'not-found-component', add it to the template of the component calling the service.

 <not-found-component *ngIf='!isFound'></not-found-component>

Answer 5

Answer №3

I once encountered a similar issue.

To solve it, I decided to create two additional components within the main component - ProductComponent, NotFoundComponent, and another one for navigating, let's call it ArticleComponent.

Subsequently, I included these components in the main one as follows:

product.component.html

<app-notFound></app-notFound>
<app-article></app-article>

Then, in the ngOnInit method, I checked if the parameter existed. If yes, I assigned it to a property like isParam = true.

The template was updated to look like this:

<app-notFound *ngIf="!isParam"></app-notFound>
<app-article *ngIf="isParam"></app-article>

While not necessarily the most optimal solution, it did the job for me!

Answer 6

I once encountered a similar issue.

To solve it, I decided to create two additional components within the main component - ProductComponent, NotFoundComponent, and another one for navigating, let's call it ArticleComponent.

Subsequently, I included these components in the main one as follows:

product.component.html

<app-notFound></app-notFound>
<app-article></app-article>

Then, in the ngOnInit method, I checked if the parameter existed. If yes, I assigned it to a property like isParam = true.

The template was updated to look like this:

<app-notFound *ngIf="!isParam"></app-notFound>
<app-article *ngIf="isParam"></app-article>

While not necessarily the most optimal solution, it did the job for me!

Different Angular 2 components are resolved by routes

Answer №1

Answer №2

Answer №3

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