Utilizing an Angular Service within the main.ts script

Question

Utilizing an Angular Service within the main.ts script

My main.ts file currently has the following code snippet:

declare const require; 
const translations = require("raw-loader!./locale/messages.de.xlf");

platformBrowserDynamic().bootstrapModule(AppModule, {
  providers: [
    { provide: TRANSLATIONS, useValue: translations },
    { provide: TRANSLATIONS_FORMAT, useValue: 'xlf' }
  ]
});

I am looking to dynamically retrieve the translation string instead of hardcoding it as

"raw-loader!./locale/messages.de.xlf"

. My idea is to utilize a service that provides this string, like so:

const translations = require(translationService.localeString); //this method doesn't work!

Can anyone suggest a solution for this? I have already developed a service for this purpose but I'm not sure how to inject it into the main.ts file.

angular typescript service

Answer 1

Answer №1

Here is the revised code snippet for Angular 9 (Inspired by Mohit Uprim's answer):

platformBrowserDynamic()
.bootstrapModule(AppModule)
.then(ref => {
  const configService = ref.injector.get(DemoService);
  alert(configService.test)
 })
.catch(err => {
   console.log(err);
});

Answer 2

Here is the revised code snippet for Angular 9 (Inspired by Mohit Uprim's answer):

platformBrowserDynamic()
.bootstrapModule(AppModule)
.then(ref => {
  const configService = ref.injector.get(DemoService);
  alert(configService.test)
 })
.catch(err => {
   console.log(err);
});

Answer 3

Answer №2

In order to utilize the service, an instance of it is required. This can be achieved by creating an instance without a constructor using Injector.

Example of DemoService:

@Injectable()
export class DemoService {
  test="hello";
  localeString="xyz";
}

Main.ts file:

    import {Injectable, ReflectiveInjector } from '@angular/core';
    var injector = ReflectiveInjector.resolveAndCreate([DemoService]);
    var demoService = injector.get(DemoService)
    alert(demoService.test)
    platformBrowserDynamic().bootstrapModule(AppModule, {
     providers: [
      { provide: TRANSLATIONS, useValue: demoService.localeString },
      { provide: TRANSLATIONS_FORMAT, useValue: 'xlf' }
     ]
    });

Now we can access the variables or methods of the service like I am doing inside alert()

Demonstration: http://plnkr.co/edit/Df6xSxJPaCZVupyMmtUp?p=preview

Constant values can be accessed without a service. Another recommended approach is to store constant variables in a separate file (e.g. environment.ts).

environment.ts file:

export const environment = {
  localeString: "raw-loader!./locale/messages.de.xlf"
};

Update the main.ts file accordingly:

import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';

import { AppModule } from './app/app.module';
import { environment } from './environments/environment';

platformBrowserDynamic().bootstrapModule(AppModule, {
  providers: [
    { provide: TRANSLATIONS, useValue: environment.localeString },
    { provide: TRANSLATIONS_FORMAT, useValue: 'xlf' }
  ]
});

Answer 4

In order to utilize the service, an instance of it is required. This can be achieved by creating an instance without a constructor using Injector.

Example of DemoService:

@Injectable()
export class DemoService {
  test="hello";
  localeString="xyz";
}

Main.ts file:

    import {Injectable, ReflectiveInjector } from '@angular/core';
    var injector = ReflectiveInjector.resolveAndCreate([DemoService]);
    var demoService = injector.get(DemoService)
    alert(demoService.test)
    platformBrowserDynamic().bootstrapModule(AppModule, {
     providers: [
      { provide: TRANSLATIONS, useValue: demoService.localeString },
      { provide: TRANSLATIONS_FORMAT, useValue: 'xlf' }
     ]
    });

Now we can access the variables or methods of the service like I am doing inside alert()

Demonstration: http://plnkr.co/edit/Df6xSxJPaCZVupyMmtUp?p=preview

Constant values can be accessed without a service. Another recommended approach is to store constant variables in a separate file (e.g. environment.ts).

environment.ts file:

export const environment = {
  localeString: "raw-loader!./locale/messages.de.xlf"
};

Update the main.ts file accordingly:

import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';

import { AppModule } from './app/app.module';
import { environment } from './environments/environment';

platformBrowserDynamic().bootstrapModule(AppModule, {
  providers: [
    { provide: TRANSLATIONS, useValue: environment.localeString },
    { provide: TRANSLATIONS_FORMAT, useValue: 'xlf' }
  ]
});

Utilizing an Angular Service within the main.ts script

Answer №1

Answer №2

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