Observe the parameters of the first child by subscribing to ActivatedRoute

Question

Observe the parameters of the first child by subscribing to ActivatedRoute

Looking for input on a better approach to implement this feature. If you have any suggestions, feel free to share them.

I am working on creating a system with multiple inboxes where users can group their emails in different categories.

For instance, http://localhost/inbox/personal/ will display emails in the personal inbox, while

http://localhost/inbox/business/3

will show emails in the business inbox and highlight the email with the ID: 3

The routes are structured like this:

const routes: Routes = [
  {
    path: '',
    pathMatch: 'full',
    redirectTo: 'personal' // redirect to personal inbox
  },
  {
    path: ':inbox',
    component: InboxContentComponent, // list of emails in :inbox
    children: [
      {
        path: '',
        component: InboxNoSelectedEmailComponent, // no email selected
      },
      {
        path: ':id',
        component: InboxSelectedEmailComponent, // show selected email content
      }
    ]
  }
];

I am having difficulty with the InboxContentComponent as I need to track changes in the inbox and whether an email is selected or not.

  constructor(private route: ActivatedRoute) {
  }
  ngOnInit() {
    this.route.paramMap.subscribe(inbox => {
      console.log('inbox', inbox);
    });
  }

Currently, events are only triggered when the inbox changes and not when the email changes. Is there a way to detect changes in the child route parameters?

Using

this.route.firstChild.paramMap.subscribe();

only works if the route has a first child during initialization. If the route is http://localhost/inbox/business/, then this.route.firstChild is null

One solution I considered is defining routes like this:

{
    path: ':inbox/:id',
    component: InboxContentComponent
}

and then checking in the InboxContentComponent if :id is set or not.

Any thoughts on this approach?

angular typescript angular-router

Answer 1

Answer №1

In order to address this type of issue, my approach would involve monitoring router events and extracting the necessary information. Here is an example of how this could be achieved:

import { Router, ActivatedRoute, NavigationEnd } from '@angular/router';
import { filter, map, mergeMap, tap } from 'rxjs/operators';

// ...
constructor(
    // ...
    private activatedRoute: ActivatedRoute,
    private router: Router
  ) {
    this.router.events
    .pipe(
      filter((event) => event instanceof NavigationEnd),
      map(() => this.activatedRoute),
      map((route) => {
        while (route.firstChild) route = route.firstChild;
        return route;
      }),
      mergeMap((route) => route.paramMap),
      tap(
        paramMap => console.log('ParamMap', paramMap)
      )
    ).subscribe(
      (paramAsMap) => // Extract the parameters (paramAsMap.params) and utilize them for highlighting or any other specific task
    )
  }

This code snippet can be customized according to your requirements. Depending on the parameters, you can choose to highlight or not to highlight.

Answer 2

In order to address this type of issue, my approach would involve monitoring router events and extracting the necessary information. Here is an example of how this could be achieved:

import { Router, ActivatedRoute, NavigationEnd } from '@angular/router';
import { filter, map, mergeMap, tap } from 'rxjs/operators';

// ...
constructor(
    // ...
    private activatedRoute: ActivatedRoute,
    private router: Router
  ) {
    this.router.events
    .pipe(
      filter((event) => event instanceof NavigationEnd),
      map(() => this.activatedRoute),
      map((route) => {
        while (route.firstChild) route = route.firstChild;
        return route;
      }),
      mergeMap((route) => route.paramMap),
      tap(
        paramMap => console.log('ParamMap', paramMap)
      )
    ).subscribe(
      (paramAsMap) => // Extract the parameters (paramAsMap.params) and utilize them for highlighting or any other specific task
    )
  }

This code snippet can be customized according to your requirements. Depending on the parameters, you can choose to highlight or not to highlight.

Observe the parameters of the first child by subscribing to ActivatedRoute

Answer №1

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