Ensure that the JSON file containing translations is fully loaded prior to proceeding with the loading of the Angular application

Question

Ensure that the JSON file containing translations is fully loaded prior to proceeding with the loading of the Angular application

In our Angular application, we have integrated internationalization using ng2-translate. We are utilizing the .instant(...) method for translations to simplify the process without having to subscribe to observables.

One issue we are facing is that using .instant can lead to errors if the translations JSON file has not finished loading. Is there a way to pause the app's loading until the translations file has completely downloaded?

angular typescript internationalization

Answer 1

Answer №1

To enhance the language translation functionality in your Angular application, consider setting up a default language translation during app initialization.

Include the following code snippet in your app.module.ts file:

providers: [
  {
    provide: APP_INITIALIZER,
    useFactory: initializeApp,
    deps: [TranslateService],
    multi: true
  }
]

import { APP_INITIALIZER } from '@angular/core';
import { TranslateService } from '@ngx-translate/core';

export function initializeApp(translate: TranslateService) {
  return () => {
    translate.setDefaultLang('es');
    return translate.use('es').toPromise();
  };
}

For more insights and instructions, refer to this comprehensive guide: https://example.com

Answer 2

To enhance the language translation functionality in your Angular application, consider setting up a default language translation during app initialization.

Include the following code snippet in your app.module.ts file:

providers: [
  {
    provide: APP_INITIALIZER,
    useFactory: initializeApp,
    deps: [TranslateService],
    multi: true
  }
]

import { APP_INITIALIZER } from '@angular/core';
import { TranslateService } from '@ngx-translate/core';

export function initializeApp(translate: TranslateService) {
  return () => {
    translate.setDefaultLang('es');
    return translate.use('es').toPromise();
  };
}

For more insights and instructions, refer to this comprehensive guide: https://example.com

Answer 3

Answer №2

The documentation clearly states the following: Obtain the immediate translated value of a key (or an array of keys). /!\ Please be aware that this method operates synchronously, while the default file loader is asynchronous. It is your responsibility to ensure that your translations have been loaded before using this method. If you are unsure, it is recommended to use the get method instead.

Additionally, it should be noted that blocking angular initialization is not supported by the Angular team.

After reviewing the library's code, it appears that the use method will always return an observable. Therefore, based on the provided example code in the documentation:

constructor(translate: TranslateService) {
    var userLang = navigator.language.split('-')[0]; // utilize navigator language if available
    userLang = /(fr|en)/gi.test(userLang) ? userLang : 'en';

    // set default language to fallback on when translation is not found in current language
    translate.setDefaultLang('en');

    // specify language to use; if unavailable, current loader will fetch them
    /* Your observable here */
    translate
        .use(userLang)
        .subscribe(res: any => 
        {
            // Add your desired code within this block as by now the language has been loaded
        });
}

With the subscribe callback function, you can execute tasks once the language is loaded. If you require further assistance, please do not hesitate to reach out with your code for more specific help.

Answer 4

The documentation clearly states the following: Obtain the immediate translated value of a key (or an array of keys). /!\ Please be aware that this method operates synchronously, while the default file loader is asynchronous. It is your responsibility to ensure that your translations have been loaded before using this method. If you are unsure, it is recommended to use the get method instead.

Additionally, it should be noted that blocking angular initialization is not supported by the Angular team.

After reviewing the library's code, it appears that the use method will always return an observable. Therefore, based on the provided example code in the documentation:

constructor(translate: TranslateService) {
    var userLang = navigator.language.split('-')[0]; // utilize navigator language if available
    userLang = /(fr|en)/gi.test(userLang) ? userLang : 'en';

    // set default language to fallback on when translation is not found in current language
    translate.setDefaultLang('en');

    // specify language to use; if unavailable, current loader will fetch them
    /* Your observable here */
    translate
        .use(userLang)
        .subscribe(res: any => 
        {
            // Add your desired code within this block as by now the language has been loaded
        });
}

With the subscribe callback function, you can execute tasks once the language is loaded. If you require further assistance, please do not hesitate to reach out with your code for more specific help.

Answer 5

Answer №3

While utilizing multipleTranslateHttpLoader, I encountered an issue.

To resolve it, I had to develop my own httpLoader.

import { HttpBackend, HttpClient } from '@angular/common/http'
import { TranslateLoader } from '@ngx-translate/core'
import * as merge from 'deepmerge'
import { forkJoin, Observable, of } from 'rxjs'
import { catchError, map } from 'rxjs/operators'

export class MegaMultiTranslateHttpLoader implements TranslateLoader {
  constructor(private _handler: HttpBackend, private _resourcesPrefix: string[]) {}

  public getTranslation(lang: string): Observable<any> {
    const requests = this._resourcesPrefix.map((prefix) => {
      const path = `${prefix}${lang}.json`

      return new HttpClient(this._handler).get(path).pipe(
        catchError((res) => {
          console.group('MegaMultiTranslateHttpLoader')
          console.error('Something went wrong for the following translation file:', path)
          console.error('Content of the error: ', res)
          console.groupEnd()
          return of({})
        }),
      )
    })

    return forkJoin(requests).pipe(map((response) => merge.all(response)))
  }
}

In your app.module.ts file, include:

export function HttpLoaderFactory(_httpBackend: HttpBackend) {
  return new MegaMultiTranslateHttpLoader(_httpBackend, ['/assets/i18n/', '/assets/vendors/i18n/'])
}

@NgModule({
imports: [
  TranslateModule.forRoot({
      loader: {
        provide: TranslateLoader,
        useFactory: HttpLoaderFactory,
        deps: [HttpBackend],
      },
    }),
  // ...
]
// ...
})

Points to Note

The suffix has been omitted assuming usage of .json files only
Here we utilize httpBackend instead of httpClient
Make sure to install npm i deepmerge which is automatically installed by the ngx-translate-multi-http-loader library

Update

Updating to the latest version of ngx-translate-multi-http-loader should resolve this issue

Answer 6

While utilizing multipleTranslateHttpLoader, I encountered an issue.

To resolve it, I had to develop my own httpLoader.

import { HttpBackend, HttpClient } from '@angular/common/http'
import { TranslateLoader } from '@ngx-translate/core'
import * as merge from 'deepmerge'
import { forkJoin, Observable, of } from 'rxjs'
import { catchError, map } from 'rxjs/operators'

export class MegaMultiTranslateHttpLoader implements TranslateLoader {
  constructor(private _handler: HttpBackend, private _resourcesPrefix: string[]) {}

  public getTranslation(lang: string): Observable<any> {
    const requests = this._resourcesPrefix.map((prefix) => {
      const path = `${prefix}${lang}.json`

      return new HttpClient(this._handler).get(path).pipe(
        catchError((res) => {
          console.group('MegaMultiTranslateHttpLoader')
          console.error('Something went wrong for the following translation file:', path)
          console.error('Content of the error: ', res)
          console.groupEnd()
          return of({})
        }),
      )
    })

    return forkJoin(requests).pipe(map((response) => merge.all(response)))
  }
}

In your app.module.ts file, include:

export function HttpLoaderFactory(_httpBackend: HttpBackend) {
  return new MegaMultiTranslateHttpLoader(_httpBackend, ['/assets/i18n/', '/assets/vendors/i18n/'])
}

@NgModule({
imports: [
  TranslateModule.forRoot({
      loader: {
        provide: TranslateLoader,
        useFactory: HttpLoaderFactory,
        deps: [HttpBackend],
      },
    }),
  // ...
]
// ...
})

Points to Note

The suffix has been omitted assuming usage of .json files only
Here we utilize httpBackend instead of httpClient
Make sure to install npm i deepmerge which is automatically installed by the ngx-translate-multi-http-loader library

Update

Updating to the latest version of ngx-translate-multi-http-loader should resolve this issue

Ensure that the JSON file containing translations is fully loaded prior to proceeding with the loading of the Angular application

Answer №1

Answer №2

Answer №3

Points to Note

Update

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