How to get parameter on Angular2 route in Angular way?

问题

Route

const appRoutes: Routes = [
    { path: '', redirectTo: '/companies/unionbank', pathMatch: 'full'},
    { path: 'companies/:bank', component: BanksComponent },
    { path: '**', redirectTo: '/companies/unionbank' }
]

Component

const NAVBAR = [
    { 
        name: 'Banks',
        submenu: [
            { routelink: '/companies/unionbank', name: 'Union Bank' },
            { routelink: '/companies/metrobank', name: 'Metro Bank' },
            { routelink: '/companies/bdo', name: 'BDO' },
            { routelink: '/companies/chinabank', name: 'China Bank' },
        ]
    },
    ...
]

Example of link: http://localhost:8099/#/companies/bdo

I want to get String bdo in the example link above.

I'm aware that I can get the link by using window.location.href and split into array. So, I can get the last param but I want to know if there's a proper method on doing this in angular way.

Any help would be appreciated. Thanks

回答1:

Update: Sep 2019

As a few people have mentioned, the parameters in paramMap should be accessed using the common MapAPI:

To get a snapshot of the params, when you don't care that they may change:

this.bankName = this.route.snapshot.paramMap.get('bank');

To subscribe and be alerted to changes in the parameter values (typically as a result of the router's navigation)

this.route.paramMap.subscribe( paramMap =>
    this.bankName = paramMap.get('bank');
)

Update: Aug 2017

Since Angular 4, params have been deprecated in favor of the new interface paramMap. The code for the problem above should work if you simply substitute one for the other.

Oritinal Answer

If you inject ActivatedRoute in your component, you'll be able to extract the route parameters

import {ActivatedRoute} from '@angular/router';
...

constructor(private route:ActivatedRoute){}
bankName:string;

ngOnInit(){
    // 'bank' is the name of the route parameter
    this.bankName = this.route.snapshot.params['bank'];
}

If you expect users to navigate from bank to bank directly, without navigating to another component first, you ought to access the parameter through an observable:

ngOnInit(){
    this.route.params.subscribe( params =>
        this.bankName = params['bank'];
    )
}

For the docs, including the differences between the two check out this link and search for "activatedroute"

回答2:

As of Angular 6+, this is handled slightly differently than in previous versions. As @BeetleJuice mentions in the answer above, paramMap is new interface for getting route params, but the execution is a bit different in more recent versions of Angular. Assuming this is in a component:

private _entityId: number;

constructor(private _route: ActivatedRoute) {
    // ...
}

ngOnInit() {
    // For a static snapshot of the route...
    this._entityId = this._route.snapshot.paramMap.get('id');

    // For subscribing to the observable paramMap...
    this._route.paramMap.pipe(
        switchMap((params: ParamMap) => this._entityId = params.get('id'))
    );

    // Or as an alternative, with slightly different execution...
    this._route.paramMap.subscribe((params: ParamMap) =>  {
        this._entityId = params.get('id');
    });
}

I prefer to use both because then on direct page load I can get the ID param, and also if navigating between related entities the subscription will update properly.

Source in Angular Docs

来源：https://stackoverflow.com/questions/40275862/how-to-get-parameter-on-angular2-route-in-angular-way

标签

angular

angular2-routing