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问题:

I want to build a web-application with angular2 and bundle this with webpack. What is the best way for providing multiple languages:

i18n-plugin: https://github.com/webpack/i18n-webpack-plugin

ng2-translate: https://github.com/ocombe/ng2-translate

回答1:

I got it working with webpack using the cookbook. The xliff file has to be converted to ts like so:

export const TRANSLATION_SV = `<?xml version="1.0" encoding="UTF-8" ?>
<xliff version="1.2" xmlns="urn:oasis:names:tc:xliff:document:1.2">
  <file source-language="en" datatype="plaintext" original="ng2.template">
    <body>
    <trans-unit id="a73e2898b9e1126ed19dbabe4b5c3715a84db61a" datatype="html">
      <source>Category</source>
      <target>Kategori</target>
    </trans-unit>
    </body>
  </file>
</xliff>`;

Then in the main.ts it has to be added

import { TRANSLATIONS, TRANSLATIONS_FORMAT, LOCALE_ID  } from '@angular/core';
import { TRANSLATION_SV } from './locale/messages.sv';

and inserted to the bootstrap step:

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

回答2:

If you are using angular-cli you can follow these steps:

Be aware that your app must be AOT compatibe, so you should be able to build it with --aot switch:
ng build --aot

Extract messages with ng xi18n command with location for translation file given:
```
ng xi18n --output-path src/i18n
```
You will get src/i18n/messages.xlf file. Copy this file and translate messages to languages you need:
```
src/i18n/messages.en.xlf
src/i18n/messages.pl.xlf
```

Serve/build your app with ng serve / ng build command (change locale accordingly):

ng serve --i18n-file=src/i18n/messages.en.xlf --locale=en --i18n-format=xlf --aot

回答3:

in case someone still wondering how to use angular 2 localization with webpack loader, i have modified the provider angular 2 cookbook provided;

First create i18n.provider.ts

import { TRANSLATIONS, TRANSLATIONS_FORMAT, LOCALE_ID } from '@angular/core';
import { Observable } from "rxjs/Rx";
export function getTranslationProviders(): Promise<Object[]> {


  // Get the locale id from the global
  const locale = document['locale'] as string;
  // return no providers if fail to get translation file for locale
  const noProviders: Object[] = [];
  // No locale or U.S. English: no translation providers
  if (!locale || locale === 'en') {
    return Promise.resolve(noProviders);
  }
  // Ex: 'locale/messages.fr.xlf`
  const translationFile = `./src/app/localezation/messages.${locale}.xlf`;
  var provider = getTranslationsWithSystemJs(translationFile)
    .then((translations: string) => [
      { provide: TRANSLATIONS, useValue: translations },
      { provide: TRANSLATIONS_FORMAT, useValue: 'xlf' },
      { provide: LOCALE_ID, useValue: locale }
    ])
    .catch(() => noProviders); // ignore if file not found

  debugger;
  return provider;
}
declare var System: any;
function getTranslationsWithSystemJs(file: string) {
// changes Start here 
  var text = "";
  var fileRequest = new XMLHttpRequest();
  fileRequest.open("GET", file, false);
  fileRequest.onerror = function (err) {
    console.log(err);
  }
  fileRequest.onreadystatechange = function () {
    if (fileRequest.readyState === 4) {
      if (fileRequest.status === 200 || fileRequest.status == 0) {
        text = fileRequest.responseText;
      }
    }
  }
  fileRequest.send()
  var observable = Observable.of(text);
  var prom = observable.toPromise();
  return prom; 
}

notice the changes are :

i used jxjs library to create observable/ promise
i used XMLHttpRequest to get the localezation files

Second in the main.ts files change the bootstrapping the same as mentioned in angular cookbook

getTranslationProviders().then(providers => {
  const options = { providers };
  platformBrowserDynamic().bootstrapModule(AppModule, options);
});

回答4:

Angular 2 Final release has i18n native support https://angular.io/docs/ts/latest/cookbook/i18n.html

Check another answer https://stackoverflow.com/a/39004058/1267942 with example and some details about usage.

ng2-translate is too verbose comparing to the native implementation. Also the author of ng2-translate is a big contributor to angular 2 i18n documentation

回答5:

A slightly modified version of @M.Nour Berro's answer.

I made this change as synchronous xhr's are deprecated and possibly support might be removed later.

function getTranslations(filePath: string): Promise<string> {
  var text = '';
  return new Promise<string> ((resolve, reject) => {
    const fileRequest = new XMLHttpRequest();
    fileRequest.open('GET', filePath, true);
    fileRequest.onerror = function (err) {
      console.log(err);
      reject(err);
    };
    fileRequest.onreadystatechange = function () {
      if (fileRequest.readyState === 4) {
        if (fileRequest.status === 200 || fileRequest.status === 0) {
          text = fileRequest.responseText;
          resolve(text);
        }
      }
    };
    fileRequest.send();
  });
}