Leveraging @Inputs with Angular 2's <router-outlet> component for optimal functionality

Question

Leveraging @Inputs with Angular 2's <router-outlet> component for optimal functionality

I am working on a webpage with a sub-navigation feature that displays subviews below a main view. I am looking for a way to pass an object to the subviews using the <router-outlet> so that I only need to retrieve the data once in the main component and share it with the sub components.

Note: I have tried using the <one></one> directive in the main.html and it works, but it is not the behavior I want.

Main View:

<h1>Details</h1>   
<a [router-link]="['./sub1']">One</a> | 
<a [router-link]="['./sub2']">Two</a> | 
<a [router-link]="['./sub3']">Three</a>   
<hr/>  
<router-outlet [data]="maindata"></router-outlet>

Sub View 1:

<h2>{{ data.name }}</h2>
...

Main View:

@Component({
    selector: 'main-detail',
    directives: [ROUTER_DIRECTIVES],
    templateUrl: './main.html'
})
@RouteConfig([
    { path: '/', redirectTo: '/one' },
    { path: '/one', as: 'One', component: OneComponent },
    { path: '/two', as: 'Two', component: TwoComponent },
    { path: '/three', as: 'Three', component: ThreeComponent }
])
export class MainComponent {
    maindata: Object = {name:'jim'};
}

Sub View 1:

@Component({
    selector: 'one',
    directives: [CORE_DIRECTIVES],
    inputs: ['data'],
    templateUrl: './one.html'
})
export class OneComponent {
    @Input() data;
}

typescript angular angular2-template

Answer 1

Answer №1

If your data is simple, you can easily pass it using RouteParams

<a [router-link]="['./sub3'],{name:'jim'}">Three</a>

Then, in your sub view:

@Component({
    selector: 'one',
    directives: [CORE_DIRECTIVES],
    templateUrl: './one.html'
})
export class OneComponent {
    data: any;
  constructor(params: RouteParams){
    this.data = params.get('data');
  }
}

You can also set up the route to always pass parameters from the component by moving the RouterConfig INSIDE the component (Note, this is not the conventional way):

export class AppCmp {
  history: string[] = [];
  constructor(public list: PersonalizationList,
              private router_: Router) {
    list.get('histoy', (response) => {
      this.history = response;
    });
    router_.config([
      { path: '/', component: HomeCmp, as: 'Home', data: this.history },
      { path: '/about', component: AboutCmp, as: 'About' }
    ]);
  }
}

Credit to the Source

If you need to handle something more complex, I recommend using a service to communicate between routes and components. This is my preferred method:

Sample Service:

import {Injectable} from 'angular2/angular2';

@Injectable()
export class CarsService {
  list1: array<any> = ['a','b','c','d'];
  list2: array<any>;

  constructor() {
    this.list2 = [1,2,3,9,11];
  }
}

How to Inject a service:

export class Cars {
  constructor(cars:CarsService) {
    this.cmpList1 = cars.list1;
    this.cmpList2 = cars.list2;
  }
}

This approach allows you to use the service for communication without worrying about parent/child relationships or other restrictions.

Answer 2

If your data is simple, you can easily pass it using RouteParams

<a [router-link]="['./sub3'],{name:'jim'}">Three</a>

Then, in your sub view:

@Component({
    selector: 'one',
    directives: [CORE_DIRECTIVES],
    templateUrl: './one.html'
})
export class OneComponent {
    data: any;
  constructor(params: RouteParams){
    this.data = params.get('data');
  }
}

You can also set up the route to always pass parameters from the component by moving the RouterConfig INSIDE the component (Note, this is not the conventional way):

export class AppCmp {
  history: string[] = [];
  constructor(public list: PersonalizationList,
              private router_: Router) {
    list.get('histoy', (response) => {
      this.history = response;
    });
    router_.config([
      { path: '/', component: HomeCmp, as: 'Home', data: this.history },
      { path: '/about', component: AboutCmp, as: 'About' }
    ]);
  }
}

Credit to the Source

If you need to handle something more complex, I recommend using a service to communicate between routes and components. This is my preferred method:

Sample Service:

import {Injectable} from 'angular2/angular2';

@Injectable()
export class CarsService {
  list1: array<any> = ['a','b','c','d'];
  list2: array<any>;

  constructor() {
    this.list2 = [1,2,3,9,11];
  }
}

How to Inject a service:

export class Cars {
  constructor(cars:CarsService) {
    this.cmpList1 = cars.list1;
    this.cmpList2 = cars.list2;
  }
}

This approach allows you to use the service for communication without worrying about parent/child relationships or other restrictions.

Answer 3

Answer №2

It seems like the syntax has been updated. The following code snippet is tested with Angular version 4.0.0

HTML (Passing Route Parameters)

<li><a [routerLink]="['/templatecreate',{mode:'New'}]">New Job</a></li>

Component

constructor(private route: ActivatedRoute) { }

ngOnInit() {       
  this.getTemplate();

  this.sub = this.route.params.subscribe(params => { this.id = params['mode'];
  console.log("Routing Mode", this.id);    
  });
}

Answer 4

It seems like the syntax has been updated. The following code snippet is tested with Angular version 4.0.0

HTML (Passing Route Parameters)

<li><a [routerLink]="['/templatecreate',{mode:'New'}]">New Job</a></li>

Component

constructor(private route: ActivatedRoute) { }

ngOnInit() {       
  this.getTemplate();

  this.sub = this.route.params.subscribe(params => { this.id = params['mode'];
  console.log("Routing Mode", this.id);    
  });
}

Answer 5

Answer №3

In my opinion, the best practice in Angular2 for passing data is through Dependency Injection using a Service. This method ensures that sensitive data is not exposed in the URL of the browser.

Furthermore, utilizing a Service promotes the principle of "Separation of Concerns", which means that Component A should not rely on Component B.

For more information on Dependency Injection, you can refer to the following links:

1) https://angular.io/guide/dependency-injection

2) https://angular.io/guide/dependency-injection-in-action

3) https://www.youtube.com/watch?v=MJrw43GP2u0

Answer 6

In my opinion, the best practice in Angular2 for passing data is through Dependency Injection using a Service. This method ensures that sensitive data is not exposed in the URL of the browser.

Furthermore, utilizing a Service promotes the principle of "Separation of Concerns", which means that Component A should not rely on Component B.

For more information on Dependency Injection, you can refer to the following links:

1) https://angular.io/guide/dependency-injection

2) https://angular.io/guide/dependency-injection-in-action

3) https://www.youtube.com/watch?v=MJrw43GP2u0

Answer 7

Answer №4

We are embarking on a new Angular project, still learning the ropes of Angular and exploring solutions as we go along.

Within our project, the shell component has the ability to invoke any of the 4 route-based "action" modules. Each module has its own service, but no component view, and can utilize any of the 6 shared components that are shared across all 4 services, meaning they cannot contain any logic specific to the calling module.

To handle this, we have implemented a service resolver called ActionModuleServiceResolver which Dependency Injects all 4 action services. This resolver determines the appropriate service based on the state (RouterStateSnapshot) URL.

@Injectable()
export class ActionModuleServiceResolver implements Resolve<ActionModuleService> {

  constructor(private _mod1: ModOneService,
    private _mod2: ModTwoService, private _mod3: ModThreeService,private _mod4: ModFourService) { }

  resolve(route: ActivatedRouteSnapshot, state: RouterStateSnapshot): ActionModuleService {
    if(state.url.includes(`/${ActionModuleType.ModOne}/`))
      return this._mod1;
    else if(state.url.includes(`/${ActionModuleType.ModTwo}/`))
      return this._mod2;
....
else
  return null;
  }
}

Each Action Module's Routing module directs to the shared component in the following manner:

    const routes: Routes = [
  {
    path: 'sharedMod1', component: SharedModOneComponent, data: {
      title: `ModOne_SharedModOne`,
      routeName: 'sharedMod1'
    }, resolve: { actionModule: ActionModuleServiceResolver }
  },

Furthermore, each SharedModule receives the activated route through Dependency Injection and retrieves the calling service:

//SharedModOne.component.ts
constructor(protected route: ActivatedRoute) {}

  ngOnInit() {
    this.actionModSvc= this.route.snapshot.data['actionModule'];
    this.actionModSvc.getDesignFile(this.route);
  }

I hope this explanation proves helpful to someone. If there are ways to enhance this setup, please feel free to share your suggestions.

Thank you,

RDV

Answer 8

We are embarking on a new Angular project, still learning the ropes of Angular and exploring solutions as we go along.

Within our project, the shell component has the ability to invoke any of the 4 route-based "action" modules. Each module has its own service, but no component view, and can utilize any of the 6 shared components that are shared across all 4 services, meaning they cannot contain any logic specific to the calling module.

To handle this, we have implemented a service resolver called ActionModuleServiceResolver which Dependency Injects all 4 action services. This resolver determines the appropriate service based on the state (RouterStateSnapshot) URL.

@Injectable()
export class ActionModuleServiceResolver implements Resolve<ActionModuleService> {

  constructor(private _mod1: ModOneService,
    private _mod2: ModTwoService, private _mod3: ModThreeService,private _mod4: ModFourService) { }

  resolve(route: ActivatedRouteSnapshot, state: RouterStateSnapshot): ActionModuleService {
    if(state.url.includes(`/${ActionModuleType.ModOne}/`))
      return this._mod1;
    else if(state.url.includes(`/${ActionModuleType.ModTwo}/`))
      return this._mod2;
....
else
  return null;
  }
}

Each Action Module's Routing module directs to the shared component in the following manner:

    const routes: Routes = [
  {
    path: 'sharedMod1', component: SharedModOneComponent, data: {
      title: `ModOne_SharedModOne`,
      routeName: 'sharedMod1'
    }, resolve: { actionModule: ActionModuleServiceResolver }
  },

Furthermore, each SharedModule receives the activated route through Dependency Injection and retrieves the calling service:

//SharedModOne.component.ts
constructor(protected route: ActivatedRoute) {}

  ngOnInit() {
    this.actionModSvc= this.route.snapshot.data['actionModule'];
    this.actionModSvc.getDesignFile(this.route);
  }

I hope this explanation proves helpful to someone. If there are ways to enhance this setup, please feel free to share your suggestions.

Thank you,

RDV

Leveraging @Inputs with Angular 2's <router-outlet> component for optimal functionality

Answer №1

Answer №2

Answer №3

Answer №4

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