Tips for transferring parameters between components: leveraging the ? and & operators within URLs

Is there a way to pass parameters between components other than using ActivatedRoute? Currently, I am utilizing ActivatedRoute.

In component1.ts

this.router.navigate(['/rate-list', 1]);

In app.module.ts

{ path: 'rate-list/:a', pathMatch: 'full', component: 
RateListComponent },

In component2.ts

ngOnInit() {
this.parameter.sub = this.route.params.subscribe(params => {
  this.parameter.a = params['a'];
  console.log(this.parameter.a);
});
}

The current setup is functioning correctly and creating a URL like http://localhost:4200/rate-list/1. But my goal is to create a URL in the format of http://localhost:4200/rate-list?a=1. Is it possible to achieve this type of URL structure? If so, how can it be done?

Answer №1

Achieving this is totally possible, and to do so, you simply need to utilize the NavigationExtras in component1 as outlined below:

let navigationExtras: NavigationExtras = {
        queryParams: {
            a: 1               
        },
    };
    this.router.navigate(['./rate-list'], navigationExtras);

Next, in component2, implement the following modifications:

public dataStream: Observable<string>;
public info : string;    
ngOnInit() {
            this.dataStream = this.route.queryParamMap
            .map((params) => params.get('a'));
            this.dataStream.subscribe((value) => this.info = value));
            console.log(this.info);
}

Lastly, remember that there's no need to include any parameters in the routing configuration like so:

{ path: 'rate-list', pathMatch: 'full', component: RateListComponent },

For further details, check out this resource.

Answer №2

Within the app module file...

{ path: 'rate-list', pathMatch: 'full', component: RateListComponent }

Inside component 2...

ngOnInit() {
    this.parameter.sub = this.route.queryParams.subscribe(params => {
        this.parameter.a = params.a;
        console.log(this.parameter.a);
    });
}  

For more information, check out this article on query parameters in Angular

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