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@ocombe
Last active May 11, 2023 07:01
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ng2-translate file loader for Angular Universal (server side)
import {TranslateLoader} from "ng2-translate/ng2-translate";
import {Observable} from "rxjs/Observable";
import fs = require('fs');
export class TranslateUniversalLoader implements TranslateLoader {
constructor(private prefix: string = 'i18n', private suffix: string = '.json') {}
/**
* Gets the translations from the server
* @param lang
* @returns {any}
*/
public getTranslation(lang: string): Observable<any> {
return Observable.create(observer => {
observer.next(JSON.parse(fs.readFileSync(`${this.prefix}/${lang}${this.suffix}`, 'utf8')));
observer.complete();
});
}
}
@vukasin-nikodijevic
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vukasin-nikodijevic commented Jun 15, 2017

Keep it simple - I'm using @angular/cli

file: src/shared/lang-switcher/custom-translate-loader.ts

import { en } from "assets/i18n/en";
import { srb } from "assets/i18n/srb";
import { TranslateLoader } from '@ngx-translate/core';
import { Observable } from 'rxjs/Observable';

export class CustomTranslateLoader implements TranslateLoader {
    public getTranslation(lang: string): Observable<any> {
        return Observable.create(observer => {
            if (lang === 'srb') {
                observer.next(srb);
            } else {
                observer.next(en);
            }
            observer.complete();
        });
    }
}

file: src/app/app.module.ts

TranslateModule.forRoot({
            loader: {
                provide: TranslateLoader,
                useClass: CustomTranslateLoader
            }
        }),

Translation files

file: src/assets/i18n/en.ts

export const en = {
    menu: 'Menu',
    search: 'Search',
};

file: src/assets/i18n/srb.ts

export const srb = {
    menu: 'Meni',
    search: 'Pretraži',
};

Hope this will help someone ;-)

@chriseugenerodriguez
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any1 had issues with integration and resolved it? can use your help. ngx-translate/core#581

@mchambaud
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That loader will not work with Angular-cli until Angular teams resolve node modules.

@mchambaud
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@Vukasin0 this solution will bundle all translations into your app. This will be problematic for larger applications...

@philip-firstorder
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philip-firstorder commented Jul 1, 2018

This file loader created a lot of problems for me, from AOT compilation errors to lint errors to big translation bundles.

For Angular Universal I successfully used the prerender from https://github.com/angular/universal-starter with a default language.

@mohamedmelsayed
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@vukasin-nikodijevic your simple solution worked for me thank you.

@shoomkloom
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shoomkloom commented Apr 29, 2020

Thanks @vukasin-nikodijevic, your solution worked perfectly!
Also wanted to add my 2 cents:
Since the different language files are actually objects, I added some more attributes for example "direction":"rtl" and "textside": "text-right" (for Bootstrap) to the Hebrew string file, and so I could use the language object throughout the application to control all the behavior related to the selected language.
Also:
Each language file has a code field e.g.: "code": "en" and I changed the browser's document title like this:
In app.component.ts:
constructor(
public translate: TranslateService,
private titleService:Title
) {
translate.addLangs([en.code, he.code]);
translate.setDefaultLang(en.code);
const browserLang = translate.getBrowserLang();
translate.use(browserLang.match(/en.code|he.code/) ? browserLang : en.code);
this.translate.get("HOME.TITLE").subscribe(title => {
this.titleService.setTitle(title);
});
}

@OmarioHassan
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OmarioHassan commented May 19, 2020

Keep it simple - I'm using @angular/cli

file: src/shared/lang-switcher/custom-translate-loader.ts

import { en } from "assets/i18n/en";
import { srb } from "assets/i18n/srb";
import { TranslateLoader } from '@ngx-translate/core';
import { Observable } from 'rxjs/Observable';

export class CustomTranslateLoader implements TranslateLoader {
    public getTranslation(lang: string): Observable<any> {
        return Observable.create(observer => {
            if (lang === 'srb') {
                observer.next(srb);
            } else {
                observer.next(en);
            }
            observer.complete();
        });
    }
}

file: src/app/app.module.ts

TranslateModule.forRoot({
            loader: {
                provide: TranslateLoader,
                useClass: CustomTranslateLoader
            }
        }),

Translation files

file: src/assets/i18n/en.ts

export const en = {
    menu: 'Menu',
    search: 'Search',
};

file: src/assets/i18n/srb.ts

export const srb = {
    menu: 'Meni',
    search: 'Pretraži',
};

Hope this will help someone ;-)

Amazing & Simple
Thnx

@Arian94
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Arian94 commented Nov 10, 2020

Keep it simple - I'm using @angular/cli

file: src/shared/lang-switcher/custom-translate-loader.ts

import { en } from "assets/i18n/en";
import { srb } from "assets/i18n/srb";
import { TranslateLoader } from '@ngx-translate/core';
import { Observable } from 'rxjs/Observable';

export class CustomTranslateLoader implements TranslateLoader {
    public getTranslation(lang: string): Observable<any> {
        return Observable.create(observer => {
            if (lang === 'srb') {
                observer.next(srb);
            } else {
                observer.next(en);
            }
            observer.complete();
        });
    }
}

file: src/app/app.module.ts

TranslateModule.forRoot({
            loader: {
                provide: TranslateLoader,
                useClass: CustomTranslateLoader
            }
        }),

Translation files

file: src/assets/i18n/en.ts

export const en = {
    menu: 'Menu',
    search: 'Search',
};

file: src/assets/i18n/srb.ts

export const srb = {
    menu: 'Meni',
    search: 'Pretraži',
};

Hope this will help someone ;-)

Worked well! 👍

@all2pie
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all2pie commented Sep 21, 2021

custom-translate-loader.ts for latest rxjs:

import { of } from 'rxjs';
import { en } from '../../../assets/i18n/en';
import { ar } from '../../../assets/i18n/ar';
import { TranslateLoader } from '@ngx-translate/core';

export class CustomTranslateLoader implements TranslateLoader {
  public getTranslation(lang: string) {
    if (lang === 'ar') {
      return of(ar);
    }
    return of(en);
  }
}

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