Retrieve component information from the service

Question

Retrieve component information from the service

Incorporated within my component is a form that I'm utilizing with reactive form and my intention is to reach this form through my service.

For example:

const id = MyComponent.id

and inside my component:

@Output: public id: number = 7;

angular typescript

Answer 1

Answer №1

When it comes to services, I see them as a way to handle external calls like API calls and serve as a "catch-all" for functionality. In Angular, defining a service in the constructor of a component means it will persist throughout the session.

There are various ways to pass data - statically or dynamically to monitor events.

For example:

In Service

export class MyService {
myString: string = '';

constructor(){ }

getMyString(): String{ return this.myString; }

    setMyString(newVal: string){
        this.myString = newVal;
    }
}

In Component

export class MyComponent implements onInit {  
myString = undefined;  
constructor(myService: MyService ){} 
    ngOnInit(){ 
        this.myString = this.myService.getMyString();
    } 
}

Alternatively, you can use BehaviorSubject to track value changes. This method is more resource-intensive but allows for subscription, with the need to unsubscribe in ngOnDestroy.

To implement this in the service:

In Service

export class MyService {
myString: behaviorSubject= new behaviorSubject('');

constructor(){ }

getMyString(): Observable{ return this.myString.asObservable(); }

    setMyString(newVal: string){
        this.myString.next(newVal);
    }
}

In Component

export class MyComponent implements onInit {
myString;
 constructor(myService: MyService ){}
    ngOnInit(){
        this.myService.getMyString().subscribe((data)=>myString=data);
    }
}

I hope these explanations have been helpful. I used strings as an example, but the possibilities are endless.

Answer 2

When it comes to services, I see them as a way to handle external calls like API calls and serve as a "catch-all" for functionality. In Angular, defining a service in the constructor of a component means it will persist throughout the session.

There are various ways to pass data - statically or dynamically to monitor events.

For example:

In Service

export class MyService {
myString: string = '';

constructor(){ }

getMyString(): String{ return this.myString; }

    setMyString(newVal: string){
        this.myString = newVal;
    }
}

In Component

export class MyComponent implements onInit {  
myString = undefined;  
constructor(myService: MyService ){} 
    ngOnInit(){ 
        this.myString = this.myService.getMyString();
    } 
}

Alternatively, you can use BehaviorSubject to track value changes. This method is more resource-intensive but allows for subscription, with the need to unsubscribe in ngOnDestroy.

To implement this in the service:

In Service

export class MyService {
myString: behaviorSubject= new behaviorSubject('');

constructor(){ }

getMyString(): Observable{ return this.myString.asObservable(); }

    setMyString(newVal: string){
        this.myString.next(newVal);
    }
}

In Component

export class MyComponent implements onInit {
myString;
 constructor(myService: MyService ){}
    ngOnInit(){
        this.myService.getMyString().subscribe((data)=>myString=data);
    }
}

I hope these explanations have been helpful. I used strings as an example, but the possibilities are endless.

Retrieve component information from the service

Answer №1

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