Question:
How to pass parameters to Angular service?

Solution

Services are a common way for Angular developers to encapsulate data and logic that can be shared between various components. You might need to pass parameters to services when working with them for a variety of reasons. Use Angular's Dependency Injection system. You can provide the service by using a factory function.


@Injectable()

export class CalculateFieldsService {

  constructor(

    private jsonForm: UntypedFormGroup,

    private destroy: DestroyRef

  ) {

    // Service constructor

  }


  // Rest of the service code...

}


export function CalculateFieldsServiceFactory(jsonForm: UntypedFormGroup, destroy: DestroyRef) {

  return new CalculateFieldsService(jsonForm, destroy);

}


By using the factory function, you can set up the providers in the component decorator to supply the service and dependencies for your component.

import { Component, Injectable, Inject } from '@angular/core';


@Component({

  selector: 'app-your-component',

  templateUrl: './your-component.component.html',

  providers: [

    {

      provide: CalculateFieldsService,

      useFactory: CalculateFieldsServiceFactory,

      deps: [UntypedFormGroup, DestroyRef]

    }

  ]

})

export class YourComponent {

  constructor(private calculateFieldsService: CalculateFieldsService) {

    // You can now use the service with the provided dependencies.

  }

}


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Nisha Patel

Nisha Patel

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