Tips for transferring data from one component to another component

Question

Tips for transferring data from one component to another component

Recently, I've been struggling to transfer data between components in my Angular project. Despite trying numerous online examples, none have seemed to work for me.

Most of the tutorials I came across suggest using @Input and @Output as the ideal way to pass data between components in Angular.

My current component structure is as follows:

I include ComponentA in the HTML of ComponentC like this:

<app-componentA</app-componentA>

ComponentB is called via modalController.

https://i.sstatic.net/By6jF.png

In my code, I pass data generated in ComponentB to ComponentC using the following method:

// componentB.ts
dimiss(filters?: any) {
  this.modalController.dismiss(filters);
}

And receive it in ComponentC like this:

// componentC.ts
const filters = await modal.onDidDismiss();
this.Myfilters = filters ;

Now, the question arises - how can I pass the data from ComponentB to ComponentA?

angular typescript input output ionic4

Answer 1

Answer №1

When it comes to transferring data within an Angular app, utilizing a service is typically the most effective approach. By injecting the service into all components that require access to shared data, you can streamline the process. Take a look at this straightforward example.

In FirstComponent:

isLoggedIn: boolean;

constructor(private myService: MyService) {}

ngOnInit() {
  this.isLoggedIn = this.myService.getLoggedInStatus();
}

In SecondComponent:

constructor(private myService: MyService) {}

onLogin(loginData) {
  this.myService.login(loginData);
}

And in MyService:

private isLoggedIn = false;

getLoggedInStatus() {
  return this.isLoggedIn;
}

login(loginData) {
  if (loginData === valid) { 
    this.isLoggedIn = true;
  }
}

This setup allows for centralized storage and modification of events and data in the service, with each component accessing what it requires. For more information on Angular services, refer to the documentation here: https://angular.io/guide/dependency-injection

Answer 2

When it comes to transferring data within an Angular app, utilizing a service is typically the most effective approach. By injecting the service into all components that require access to shared data, you can streamline the process. Take a look at this straightforward example.

In FirstComponent:

isLoggedIn: boolean;

constructor(private myService: MyService) {}

ngOnInit() {
  this.isLoggedIn = this.myService.getLoggedInStatus();
}

In SecondComponent:

constructor(private myService: MyService) {}

onLogin(loginData) {
  this.myService.login(loginData);
}

And in MyService:

private isLoggedIn = false;

getLoggedInStatus() {
  return this.isLoggedIn;
}

login(loginData) {
  if (loginData === valid) { 
    this.isLoggedIn = true;
  }
}

This setup allows for centralized storage and modification of events and data in the service, with each component accessing what it requires. For more information on Angular services, refer to the documentation here: https://angular.io/guide/dependency-injection

Tips for transferring data from one component to another component

Answer №1

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