Sending dynamic information via Angular 2 routing

Question

Sending dynamic information via Angular 2 routing

Passing static data to an Angular 2 route without displaying it in the URL is achievable.

However, the real challenge lies in passing dynamic data or objects using the same approach.

Answer 1

Answer №1

To access data in routes, you can utilize a resolver which provides the necessary information just like static data in route configurations.

For a detailed example, refer to https://angular.io/guide/router#resolve-guard

@Injectable()
export class CrisisDetailResolve implements Resolve<Crisis> {
  constructor(private cs: CrisisService, private router: Router) {}
  resolve(route: ActivatedRouteSnapshot): Promise<Crisis>|boolean {
    let id = route.params['id'];
    return this.cs.getCrisis(id).then(crisis => {
      if (crisis) {
        return crisis;
      } else { // id not found
        this.router.navigate(['/crisis-center']);
        return false;
      }
    });
  }
}

path: '',
component: CrisisListComponent,
children: [
  {
    path: ':id',
    component: CrisisDetailComponent,
    canDeactivate: [CanDeactivateGuard],
    resolve: {
      crisis: CrisisDetailResolve
    }
  },

ngOnInit() {
  this.route.data
    .subscribe((data: { crisis: Crisis }) => {
      this.editName = data.crisis.name;
      this.crisis = data.crisis;
    });
}

Answer 2

To access data in routes, you can utilize a resolver which provides the necessary information just like static data in route configurations.

For a detailed example, refer to https://angular.io/guide/router#resolve-guard

@Injectable()
export class CrisisDetailResolve implements Resolve<Crisis> {
  constructor(private cs: CrisisService, private router: Router) {}
  resolve(route: ActivatedRouteSnapshot): Promise<Crisis>|boolean {
    let id = route.params['id'];
    return this.cs.getCrisis(id).then(crisis => {
      if (crisis) {
        return crisis;
      } else { // id not found
        this.router.navigate(['/crisis-center']);
        return false;
      }
    });
  }
}

path: '',
component: CrisisListComponent,
children: [
  {
    path: ':id',
    component: CrisisDetailComponent,
    canDeactivate: [CanDeactivateGuard],
    resolve: {
      crisis: CrisisDetailResolve
    }
  },

ngOnInit() {
  this.route.data
    .subscribe((data: { crisis: Crisis }) => {
      this.editName = data.crisis.name;
      this.crisis = data.crisis;
    });
}

Answer 3

Answer №2

If you are looking to pass data in Angular, there are two approaches you can take:

{ path: 'some:data', component: SomeComonent }

One way is not recommended, but you can use data as a router parameter and pass it like this:

let data = {"key":"value"}
this.router.navigate(['/some', data)

The second approach involves using a service instead of passing data through route parameters. This is because passing large amounts of data through route params can be risky as the data may be visible to users.

@Injectable()
export class SomeService {
  data = {};
}

@Component({...
   providers: [SomeService]
export class Parent {
  constructor(private someService:SomeService) {}

  private click() {
    this.someService.data = {"key":"value"}
  }
}

Answer 4

If you are looking to pass data in Angular, there are two approaches you can take:

{ path: 'some:data', component: SomeComonent }

One way is not recommended, but you can use data as a router parameter and pass it like this:

let data = {"key":"value"}
this.router.navigate(['/some', data)

The second approach involves using a service instead of passing data through route parameters. This is because passing large amounts of data through route params can be risky as the data may be visible to users.

@Injectable()
export class SomeService {
  data = {};
}

@Component({...
   providers: [SomeService]
export class Parent {
  constructor(private someService:SomeService) {}

  private click() {
    this.someService.data = {"key":"value"}
  }
}

Answer 5

Answer №3

To get the best solution, it is recommended to merge the insights from the following two responses:

Referencing Günter Zöchbauer's answer, a custom Resolver acting as a message enricher is suggested. This Resolver passes all crisis-related data to CrisisComponent when an URL ending in /crisis/15 is accessed. While this Resolver is necessary, it should be noted that OP might prefer not displaying any data in the URL.
In Tsadkan Yitbarek's response, the idea of using a service for data storage and communication similar to Redux/Flux stores is shared. Although considered excessive by some, having a designated storage location for information is crucial.

The optimal approach involves embedding the shared data within the Resolver itself: Since services are persistent and remain as single instances, the data can securely reside in the resolver:

// --- CrisisDetailResolve ---
// Add the following lines inside the function body:
private currentCrisisId: number | string

set(crisisId: number | string) {
   this.currentCrisisId = crisisId 
}

// Modify line 5 in CrisisDetailResolve:
 let id: number = 0 + this.currentCrisisId

// -- In your code --
// By concealing the crisis number from users, you can navigate effortlessly:
private click(crisisId : string | number) {
  // Notify the resolver about the upcoming crisis:
  this.crisisResolve.set(crisisId)  
  // Direct to CrisisDetail via CrisisResolve:
  this.router.navigate(['/crisisDetail')
  // CrisisDetail component can now access id and name through `data` during NgOnInit,
  // mirroring Günter Zöchbauer's method and Angular documentation
}

For further details, consult the Angular Docs on Routing

Answer 6

To get the best solution, it is recommended to merge the insights from the following two responses:

Referencing Günter Zöchbauer's answer, a custom Resolver acting as a message enricher is suggested. This Resolver passes all crisis-related data to CrisisComponent when an URL ending in /crisis/15 is accessed. While this Resolver is necessary, it should be noted that OP might prefer not displaying any data in the URL.
In Tsadkan Yitbarek's response, the idea of using a service for data storage and communication similar to Redux/Flux stores is shared. Although considered excessive by some, having a designated storage location for information is crucial.

The optimal approach involves embedding the shared data within the Resolver itself: Since services are persistent and remain as single instances, the data can securely reside in the resolver:

// --- CrisisDetailResolve ---
// Add the following lines inside the function body:
private currentCrisisId: number | string

set(crisisId: number | string) {
   this.currentCrisisId = crisisId 
}

// Modify line 5 in CrisisDetailResolve:
 let id: number = 0 + this.currentCrisisId

// -- In your code --
// By concealing the crisis number from users, you can navigate effortlessly:
private click(crisisId : string | number) {
  // Notify the resolver about the upcoming crisis:
  this.crisisResolve.set(crisisId)  
  // Direct to CrisisDetail via CrisisResolve:
  this.router.navigate(['/crisisDetail')
  // CrisisDetail component can now access id and name through `data` during NgOnInit,
  // mirroring Günter Zöchbauer's method and Angular documentation
}

For further details, consult the Angular Docs on Routing

Answer 7

Answer №4

If you want to transfer dynamic information from Angular7.2, utilize the state object.

Within the Component, send data through navigateByUrl:

  public product = { id:'1', name:"Angular"};
  gotoDynamic() {
     this.router.navigateByUrl('/dynamic', { state: this.product });
  }

To retrieve the data, use history.state:

In dynamicComponent

    ngOnInit() {
           this.product=history.state;
    }

For more details, check out: Passing Dynamic Data

Answer 8

If you want to transfer dynamic information from Angular7.2, utilize the state object.

Within the Component, send data through navigateByUrl:

  public product = { id:'1', name:"Angular"};
  gotoDynamic() {
     this.router.navigateByUrl('/dynamic', { state: this.product });
  }

To retrieve the data, use history.state:

In dynamicComponent

    ngOnInit() {
           this.product=history.state;
    }

For more details, check out: Passing Dynamic Data

Sending dynamic information via Angular 2 routing

Answer №1

Answer №2

Answer №3

Answer №4

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