Triggering an event within a component to execute a specific function in another component

Question

Triggering an event within a component to execute a specific function in another component

I am working on a component that includes multiple routes such as home, app, and navbar.

My goal is to have the encrementcalc() function execute when the navbar button is pressed. I attempted to use the event emitter but was unsuccessful. Can someone provide guidance on how to implement this?

Your help would be greatly appreciated.

For more details, please refer to the example provided here

Here's the code snippet:

<div class="container">
<nav class="navbar navbar-default">
  <div class="container-fluid">
    <div class="navbar-header">
    </div>
    <ul class="nav navbar-nav pull-right">
      <li routerLinkActive="active"><a [routerLink]="['/home']">home</a></li>
      <li routerLinkActive="active"><a [routerLink]="['/navbar']">navbar</a></li>
          </ul>
  </div>
</nav>
  <router-outlet></router-outlet>
</div>

https://i.sstatic.net/PwgCA.png

https://i.sstatic.net/vQXYf.png

angular typescript

Answer 1

Answer №1

To establish seamless communication between the navbar and home components (or any other component), you need to develop a service similar to the following example:

@Injectable({
  providedIn: 'root'
})

export class NavbarService {
  attributeChange: EventEmitter<number> = new EventEmitter();

  constructor() {}

  emitAttributeChange(attribute: number) {
    this.attributeChange.emit(attribute);
  }

  getNavChangeEmitter() {
    return this.attributeChange;
}

In your navbar component, include the following method:

IncrementInHome(){
  this.navbarService.emitAttributeChange(5);
}

Then, in your home component's `OnInit` method, receive and process the sent data:

ngOnInit() {
  this.subscription$ = this.navbarService.getNavChangeEmitter().subscribe(
    newChangedAttribute => {
      this.incrementCalc();
    });
 }

Answer 2

To establish seamless communication between the navbar and home components (or any other component), you need to develop a service similar to the following example:

@Injectable({
  providedIn: 'root'
})

export class NavbarService {
  attributeChange: EventEmitter<number> = new EventEmitter();

  constructor() {}

  emitAttributeChange(attribute: number) {
    this.attributeChange.emit(attribute);
  }

  getNavChangeEmitter() {
    return this.attributeChange;
}

In your navbar component, include the following method:

IncrementInHome(){
  this.navbarService.emitAttributeChange(5);
}

Then, in your home component's `OnInit` method, receive and process the sent data:

ngOnInit() {
  this.subscription$ = this.navbarService.getNavChangeEmitter().subscribe(
    newChangedAttribute => {
      this.incrementCalc();
    });
 }

Answer 3

Answer №2

If you need to enhance communication, I suggest utilizing a specialized service.

To begin, establish an increment.service.ts file.

import { Injectable } from '@angular/core';
import { Subject, Observable } from 'rxjs';

@Injectable({ providedIn: 'root' })
export class IncrementService {
  private calcSource = new Subject<any>();

  calc$: Observable<any> = this.calcSource.asObservable();

  increment(x: number) {
    this.calcSource.next(x);
  }
}

Next, within your NavbarComponent:

import {IncrementService} from '../increment.service';

constructor(private _incrementService: IncrementService) {}

incrementInHome() {
this._incrementService.increment(7);
}

Lastly, in your HomeComponent:

import {IncrementService} from '../increment.service';

calc = 5;
constructor(private _incrementService: IncrementService) {}

ngOnInit() {
this._incrementService.calc$.subscribe(x => this.calc += x)
}

Answer 4

If you need to enhance communication, I suggest utilizing a specialized service.

To begin, establish an increment.service.ts file.

import { Injectable } from '@angular/core';
import { Subject, Observable } from 'rxjs';

@Injectable({ providedIn: 'root' })
export class IncrementService {
  private calcSource = new Subject<any>();

  calc$: Observable<any> = this.calcSource.asObservable();

  increment(x: number) {
    this.calcSource.next(x);
  }
}

Next, within your NavbarComponent:

import {IncrementService} from '../increment.service';

constructor(private _incrementService: IncrementService) {}

incrementInHome() {
this._incrementService.increment(7);
}

Lastly, in your HomeComponent:

import {IncrementService} from '../increment.service';

calc = 5;
constructor(private _incrementService: IncrementService) {}

ngOnInit() {
this._incrementService.calc$.subscribe(x => this.calc += x)
}

Answer 5

Answer №3

Based on the structure of your components, it might be beneficial to consider utilizing a service. This service could include a property for maintaining the state along with various methods for accessing and updating it. Utilizing this service would allow you to easily increment the property from the navigation bar and retrieve the current value from the home component.

Answer 6

Based on the structure of your components, it might be beneficial to consider utilizing a service. This service could include a property for maintaining the state along with various methods for accessing and updating it. Utilizing this service would allow you to easily increment the property from the navigation bar and retrieve the current value from the home component.

Triggering an event within a component to execute a specific function in another component

Answer №1

Answer №2

Answer №3

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