How to handle angular 5 recursive unknown exact number router parameters?

问题

Is there a way to handle recursively unknown exact number of router parameters?

For example:

We have products categories, which can have subcategories, subcategories can have it's own subcategories and so on. There are a few main conditions:

• if a such category has no subcategories we redirect to /categories/{id}/items that will open items list component.
• if category has subcategory it should be redirected to next nested tree level /categories/{id}/{id}/.../{id} which should open the last categoryId subcategories list component.
• after getting to the last category which doesn't has subcategories items list component will be shown /categories/{id}/{id}/.../{id}/items.

The solutions to check and redirect is to have router resolver. But how track those urls in routing module ?

From my perspective the routes should look something like this:

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

Is it possible implement it in a such way ?

回答1:

Possible solution with componentless routes: in routes config

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

in component file:

export class SubcategoriesListComponent {

  constructor(aroute: ActivatedRoute) {
    aroute.url.subscribe((data) => {
      console.log('params ', data); //contains all the segments so put logic here of determining what to do according to nesting depth
    });

  }

}

Here is the output example (i tested on my project ErrorComponent so don't be confused)

来源：https://stackoverflow.com/questions/48807518/how-to-handle-angular-5-recursive-unknown-exact-number-router-parameters