What is the process to activate a function within a component once a service method has been run?

Question

What is the process to activate a function within a component once a service method has been run?

I'm currently working on a chart configuration using amCharts, where an eventListener is registered for the bullets. This event listener then triggers another function in my chart service.

My goal is to activate a method in my component as soon as the eventListener in the chart service is triggered. What would be the best way to achieve this using Angular?

Here's a snippet of my chart service (chart.service.ts):

getSingleChart(chart, amChart) {
  // some configurations
  // ...

  this.chart.updateChart(amChart, () => {
    // some configurations
    // ...
    amChart.addListener('clickGraphItem', this.bulletClicked);
  });

  // Not sure if this method is necessary?
  // The intention here was to execute the method in the component when bulletClicked pro is true
  chartBulletClicked() {
    return this.bulletClicked = true;
  }
}

The method in my component that should be triggered (chart.component.ts):

onBulletClicked() {
    // ...
}

angular typescript rxjs angular-services angular-dependency-injection

Answer 1

Answer №1

To ensure that your eventListener triggers every time, you can create a subject in your service and subscribe to it in your component to execute a method on each new emission:

Service Code:


private _eventSubject$: Subject<void> = new Subject();

get eventTriggered$(): Observable<void> {
    return this._eventSubject$.asObservable();
}

triggerEvent() {
  // some configurations
  // ...

  this.chart.updateChart(amChart, () => {
    // more configurations
    // ...
    amChart.addListener('clickGraphItem', () => this._eventSubject$.next());
  });

}

Component Code:

...
ngOnInit() {
    this.service.eventTriggered$.subscribe(() => this.onBulletClicked());
}

onBulletClicked() {
    // perform actions
}
...

Answer 2

To ensure that your eventListener triggers every time, you can create a subject in your service and subscribe to it in your component to execute a method on each new emission:

Service Code:


private _eventSubject$: Subject<void> = new Subject();

get eventTriggered$(): Observable<void> {
    return this._eventSubject$.asObservable();
}

triggerEvent() {
  // some configurations
  // ...

  this.chart.updateChart(amChart, () => {
    // more configurations
    // ...
    amChart.addListener('clickGraphItem', () => this._eventSubject$.next());
  });

}

Component Code:

...
ngOnInit() {
    this.service.eventTriggered$.subscribe(() => this.onBulletClicked());
}

onBulletClicked() {
    // perform actions
}
...

Answer 3

Answer №2

If you want to effectively handle events, consider using observables:

Service:

 privatereadonly chartBulletClicked$$ = new Subject<void>();
 public readonly chartBulletClicked$ = this.chartBulletClicked$$.asObservable();


getSingleChart(chart, amChart) {
  // include necessary configurations
  // ...

  this.chart.updateChart(amChart, () => {
    // additional configurations
    // ...
    amChart.addListener('clickGraphItem', () => this.chartBulletClicked$$.next());
  });

  // Unsure about the necessity of this method
  // The intention was to execute when bulletClicked property is true in the component
  chartBulletClicked() {
    return this.bulletClicked = true;
  }
}

Component:

  private subscriptions = new Subscription();
  ngOnInit(){
    this.subscriptions.add(
      this.myService.chartBulletClicked$.subscribe(() => {
        // Implement necessary actions here
      });
    );
  }

  ngOnDestroy() {
    this.subscriptions.unsubscribe();
  }

Remember to always unsubscribe when your component is destroyed to prevent memory leaks.

(Note: Possible typos may exist as this was written directly here)

Answer 4

If you want to effectively handle events, consider using observables:

Service:

 privatereadonly chartBulletClicked$$ = new Subject<void>();
 public readonly chartBulletClicked$ = this.chartBulletClicked$$.asObservable();


getSingleChart(chart, amChart) {
  // include necessary configurations
  // ...

  this.chart.updateChart(amChart, () => {
    // additional configurations
    // ...
    amChart.addListener('clickGraphItem', () => this.chartBulletClicked$$.next());
  });

  // Unsure about the necessity of this method
  // The intention was to execute when bulletClicked property is true in the component
  chartBulletClicked() {
    return this.bulletClicked = true;
  }
}

Component:

  private subscriptions = new Subscription();
  ngOnInit(){
    this.subscriptions.add(
      this.myService.chartBulletClicked$.subscribe(() => {
        // Implement necessary actions here
      });
    );
  }

  ngOnDestroy() {
    this.subscriptions.unsubscribe();
  }

Remember to always unsubscribe when your component is destroyed to prevent memory leaks.

(Note: Possible typos may exist as this was written directly here)

What is the process to activate a function within a component once a service method has been run?

Answer №1

Answer №2

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