Dealing with router parameters of an indefinite number in Angular 5: A comprehensive guide

Is there a method to efficiently handle an unknown number of router parameters in a recursive manner?

For instance:

We are dealing with product categories that may have subcategories, which can have their own subcategories and so on. There are a few key criteria:

  • If a category has no subcategories, we will redirect to /categories/{id}/items to display the list of items.
  • If a category has subcategories, it should be redirected to the next nested level like /categories/{id}/{id}/.../{id} which will display the subcategories list of the last categoryId.
  • Once we reach the final category without any subcategories, we will show the items list component at
    /categories/{id}/{id}/.../{id}/items
    .

The solution for handling this routing is to use a router resolver. But how can we effectively track these URLs in the routing module?

In my opinion, the routes should appear as follows:

{
  path: '/categories/:id',
  component: SubcategoriesListComponent
},
{
  path: '/categories/:id/**/:id',
  component: SubcategoriesListComponent,
},
{
  path: '/categories/:id/**/:id/items',
  component: CategoryItemsListComponent
}

Is it feasible to implement it in such a way?

Answer №1

One potential resolution utilizing routes without components: In the routes configuration

{
    path: 'categories/:id', children: [
    {path: '**', component: SubcategoriesListComponent}
]
}

Within the component file:

export class SubcategoriesListComponent {

  constructor(aroute: ActivatedRoute) {
    aroute.url.subscribe((data) => {
      console.log('params ', data); //contains all the segments so implement logic here to determine actions based on nesting depth
    });

  }

}

You can view an example output (tested with ErrorComponent in my project for demonstration)

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