Angular 2/4 How to get route parameters in app component?

user_2731617 0
Viewed 47648

enter image description hereAs I am new to angular 2/4 I am having trouble setting up a new application as per my need.

I am trying to build an application which will be called for from some another application. Calling application will send some parameter like token, username, application id and etc.

Now, as in Angular 2/4, app.component is our landing component and every first request will go through it. So, I want to get those parameter here in app component and load some user detail, make a local session and the move to other stuff.

problem is when I am trying to access these parameter I am getting anything.

Here is the URL which will start my angular application: http://localhost:86/dashboard?username=admin&token=xyz&appId=8

Here is my routing file code:

const routes: Routes = [
  {
    path: 'dashboard/:username, token', component: AppComponent
  }
];

@NgModule({
  imports: [RouterModule.forRoot(routes)],
  exports: [RouterModule]
})
export class AppRoutingModule {

}

Here is my App Component Code:

import { Component, OnInit } from '@angular/core';
import { AuthenticationService } from 'app/services/authentication/authentication.service';
import { User } from 'app/models/user/user';
import { AppConfig } from 'app/helpers/AppConfig';
import { ActivatedRoute, Router } from '@angular/router';


@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent implements OnInit {
  _user: User = new User();
  obj: any;
  error: any;

  loginName: string;
  private id: any;

  constructor(
    private authenticationService: AuthenticationService,
    private config: AppConfig,
    private route: ActivatedRoute,
    private router: Router

  ) { }

  ngOnInit() {    
    this.loadCurrentUserDetail();
    this.getParamValues()

  }

  getParamValues() {
    this.id = this.route.queryParams.subscribe(params => {      
       this.loginName = params['username']; 
    });
  }

Here params is empty don't know why?

Thanks in advance!

As in image params object has nothing.

angular2-routing angular
4 Answers
import { Component, OnInit, OnDestroy } from '@angular/core';
import {  Router, ActivatedRoute, Params, RoutesRecognized  } from '@angular/router';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.scss']
})
export class AppComponent implements OnInit {

  constructor( private route: ActivatedRoute, private router: Router ) {}

  ngOnInit(): void {
    this.router.events.subscribe(val => {
       if (val instanceof RoutesRecognized) {
         if (val.state.root.firstChild.params.id) {
          localStorage.setItem('key1', val.state.root.firstChild.params.id);
          localStorage.setItem('key2', val.state.root.firstChild.params.id2);
         }
            console.log('test', val.state.root.firstChild.params);
        }
    });

}

}
user_73377290

My application had the need to read queryParams in appComponent (not-routed) to be able to set some variables before routing to any other component. I didn't want to change the architecture to route appComponent.

This is the approach I took by subscribing to router events:

private _queryParamsSet: boolean = false;
  constructor(
    private _router: Router,
    private _activatedRoute: ActivatedRoute
  ) { }

  async ngOnInit() {    
     const onNavigationEnd = this._router.events
      .pipe(
        tap((data) => {
          if (!this._queryParamsSet && (data as NavigationStart)?.url) {
            const queryParams = CoreHelper.getQueryParamsFromURL((data as 
               NavigationStart).url);
            if (queryParams) {
              // set variables which will eventually decide which route to take
            }
            this._queryParamsSet = true;
          }
        }),
        filter(
          event => event instanceof NavigationEnd
        ));
}
user_18833350
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