Angular 4 Getting Child route param

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In my application the route is something like this :-

{ path: 'route-a', component: ComponentA, children : [

    { path: ':param-b', component: ChildComponentB, children : [

        { path: ':param-c', component: ChildComponentC }

    ]}

]},

Now in my ComponentA I am trying to subscribe to child param to get param-b

     this.routefirstChild$ = this.route.firstChild.params.subscribe($routefirstChild => {

        console.log($routefirstChild, '$routefirstChild');

     });

Now when I navigate to example.com/route-a I am getting this.route.firstChild is null error.

But if I navigate to example.com/route-a/1234 the param is passed. Which observable to have to subscribe that doesn't trigger an error but would pass the child params when the route is activated.

I ended up implementing the following solution :-

import { ActivatedRoute, NavigationEnd, Router } from '@angular/router';

     this.routeEvents$ = this.router.events.subscribe(

     ( $routeEvents ) : void => {

        if ( $routeEvents instanceof NavigationEnd ) {

            if(typeof this.route.firstChild != "undefined" && this.route.firstChild){

                console.log(this.route.firstChild.snapshot.params, 'this.route.firstChild.snapshot.params');

            }

        }

     });

Accessing Parent And Child Route Segment Parameters In Angular , The other day, I took a look at the Angular 4 Router; and, having not Now, if you want to access a Parent or Child route's parameters, you can Ok, now we can get into the real Parent / Child View component relationship. children: contains all the child routes activated under the current route. pathFromRoot: The path from the root of the router state tree to this route. Conclusion. We looked at how to pass parameters or data to the Route. The parameters are passed to the route by using routerLink parameters in the routerLink directive.

You could do something like this:

function getChildMostRoute(route: ActivatedRoute) {
    let route = route.snapshot;

    // Get the current active descendent
    while (route.firstChild) {
        route = route.firstChild;
    }

    const allPathsJoined = route.pathFromRoot
        .map(s => s.url.map(u => u.path).join('/'))
        .join('/')

    return {
        path: allPathsJoined,
        params: route.queryParams,
    };
}

Defining Child Routes, Where would the components for these child routes be displayed? Just like we had a Overview & Specs components get added here by the router --> The child route component can access the parent route's parameters as follows:. Local Redirects Automatically Append The Non-Local Route Segments In Angular 4.4.4; A Single Route Parameter Can Match Multiple URL Segments In Angular 4.4.4; Named-Outlets Require Non-Empty Parent Route-Segment Paths In Angular 4.4.4; Conditional Router Outlets Mostly Work In Angular 4.4.0-RC.0

Angular 9

this.activatedRoute.firstChild.paramMap.pipe(tap()).subscribe(params => {
      const id = params.get('id');
});

ActivatedRoute holds the current route (partial) only. Which means, if you are at /xyz then your ActivatedRoute will hold /xyz/:id if there is a parameter. If you are currently in a parent route and you'd like to access a parameter in the child route, you can call as above, or if you would like to use a grand child route parameter, you can use activatedRoute.firstChild.firstChild to react there and then subscribe to paramMap as shown above. Similarly, you can also go up in the routing hierarchy using activatedRoute.parent instead of firstChild.

Hope this helps!

In-app navigation: routing to views, For an introduction to Angular with a ready-made app, see Getting Started. For a more a route: Import ActivatedRoute and ParamMap to your component. A child route is like any other route, in that it needs both a path and a component . There are no parameters for this parent route. The second item identifies the child route details about a particular crisis (/:id). The details child route requires an id route parameter. You added the id of the Dragon Crisis as the second item in the array (1). The resulting path is /crisis-center/1.

Routing & Navigation, The :id in the second route is a token for a route parameter. to traverse up and down the route tree to get information from parent, child and sibling routes. Angular route definition with :id path param getting route path parameter in a non-routed component is not easy at all! interested in the path parameter of the first level child route

Nested Routes • Angular, and the route configuration for its parent is if we injected ActivatedRoute into our child ArtistTrackListComponent and tried to print out the params surprisingly we just get an empty object printed out. Route protection using guards, Route parameters, Child routes, Auxiliary routes etc. Handling Route Parameters with Angular 9. In the previous tutorial, we have created a basic routing between components with the Angular Router. In this tutorial we're going to see how to handle route parameters in Angular 9.

Access parent Route params with Angulars Router, With the router/URL being an application's “source of truth”, we need to be able to access parts of the URL for data purposes, such as. Let's look at how we can use Angular's Observable-driven Router so get automatic updates when a Once we hit that :id , we're directed to the first child route, metadata . Parent Route Param subscriptions Scenario I’m currently working on building out Ultimate Angular’s platform, and as such have these routes (in the URL, not my routing definitions) - with us assuming 1234 is our dynamic :id :

Comments
  • Hm... actually you are getting what u wrote, first navigation seems have no child parameters, I see no problem here, all runs according code 'example.com/route-a' are path to componentA, and there are no child routes activated at all
  • I agree, but eventually there will be child routes, how do I ensure if there is a child route that gets activated the parent gets notified about the child param?
  • You are doing it right now, when u added 1234 as params it is componentB parameters, and you sad that you are notified ;)
  • Only if I reload the page not when clicked via routerLink. Because the subscription has failed in the first instance when there are no child, I don't get notified once there are.