Navigating to child components within an Angular module is currently disabled

My Project Dashboard contains 2 sub apps.

├───projects
│   ├───app1
│   │   ├───e2e
│   │   │   └───src
│   │   └───src
│   │       ├───app
│   │       │   ├───form
│   │       │   ├───home
│   │       │   └───page-not-found
│   │       ├───assets
│   │       └───environments
│   ├───app2
│   │   ├───e2e
│   │   │   └───src
│   │   └───src
│   │       ├───app
│   │       │   ├───core
│   │       │   ├───home
│   │       │   ├───mail-view
│   │       │   ├───mailbox
│   │       │   ├───models
│   │       │   ├───page-not-found
│   │       │   └───service
│   │       ├───assets
│   │       └───environments
│   └───app3
│       ├───e2e
│       │   └───src
│       └───src
│           ├───app
│           ├───assets
│           └───environments
├───resources
└───src
    ├───app
    │   ├───components
    │   │   ├───navigation
    │   │   └───progressbar
    │   ├───core
    │   │   ├───authentication
    │   │   └───service
    │   ├───dashboard
    │   │   ├───models
    │   │   ├───service
    │   │   └───widget
    │   ├───login
    │   └───shared
    │       ├───common
    │       │   ├───config
    │       │   └───service
    │       └───core
    ├───assets
    └───environments

Navigation works fine from dashboard-app to app1 and app2.
Within app2, mail-view and mailbox are child components of the home component.

const routes: Routes = [
  { path: 'mail', redirectTo: 'mail/home', pathMatch: 'full' },
  { path: 'mail/home', pathMatch: 'full', component: HomeComponent,
    children: [
      { path: '', pathMatch: 'full', component: LoaderComponent },
      { path: 'mailbox/:type', component: MailboxComponent ,  resolve: { response: MailboxResolverService }},
      { path: 'mailbox/BLK/list/:header', pathMatch: 'full', component: BulkMailListComponent },
      { path: 'viewMail/:type/:mailId', pathMatch: 'full', component: MailViewComponent }
    ]
  /*canActivate: [AuthGuard]*/ },
];

@NgModule({
  imports: [RouterModule.forChild(routes)],
  exports: [RouterModule]
})

However, I encounter an 'Path not Found' error when trying to navigate to any of the child components.

this.route.navigate(['./mailbox/', AppConstants.MAILBOX_TYPE.INBOX_I], {relativeTo: this.aRoute}); 

custom-error-handler.service.ts:25 Error: Uncaught (in promise): Error: Cannot match any routes. URL Segment: 'mail/home/mailbox/INBI'
Error: Cannot match any routes. URL Segment: 'mail/home/mailbox/INBI'
    at ApplyRedirects.push../node_modules/@angular/router/fesm5/router.js.ApplyRedirects.noMatchError (router.js:2459)
    at CatchSubscriber.selector (router.js:2440)
  1. Is there a specific way to declare children when using sub modules?
  2. Or should navigation be done differently?

Thank you in advance.

angulartypescriptroutes

Answer №1

After a few rounds of trial and error, I finally discovered that the culprit was the pathMatch: 'full' parameter causing the issue. By making a simple adjustment to the parent routing parameter from

path: 'mail/home', pathMatch: 'full', component: HomeComponent

to
path: 'mail/home', component: HomeComponent

the problem was successfully resolved. As explained by Angular -

The path-matching strategy can be either 'prefix' or 'full', with the default being 'prefix'.

By default, the router checks URL elements starting from the left to determine if the URL matches a given path, and stops when a match is found. For example, '/team/11/user' matches 'team/:id'.

The 'full' path-match strategy matches against the entire URL. This is important when redirecting empty-path routes. Without this consideration, the router could create an endless loop by applying the redirect even when navigating to the redirect destination due to an empty path being a prefix of any URL.

It appears that when using pathmatch: 'full' in the Angular router, after the first match is found in the parent, it does not continue to search in its children. In contrast, with the default pathMatch: 'prefix', Angular will continue to search in child components for additional URL matches even after the initial match.
For a clear explanation, watch this 3-minute video - https://www.youtube.com/watch?v=St2Gywjlwks

Answer №2

The issue lies within the directory ./mailbox/.

To resolve the problem, make sure to use the following code snippet:

this.route.navigate(['mailbox/', AppConstants.MAILBOX_TYPE.INBOX_I], {relativeTo: this.aRoute});

Answer №3

@NgModule({
  imports: [RouterModule.forChild(routes)],
  exports: [RouterModule]
})
No need to import in this way, simply call your child component in the view like this:
<ul>
<li>
  Your parent
  <ul>
     <li> Your child </li>
  </ul>
</li>
<ul>

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