Angular i18国际化,以编程方式更改语言 [英] Angular i18 internationalization, language change programmatically
问题描述
通过此链接,我试图在Angular 6应用中实现i18国际化,以便在html模板中以英语和意大利语翻译一些文本和日期时间.
from this link I tried to implement the i18 internationalization in my Angular 6 app in order to translate in english and italian some text and datetime in my html template.
https://next.angular.io/guide/i18n
我知道此功能分为三个阶段:
I understood that this function consist in 3 phases:
1)定义翻译文本.没问题,我创建了一个src/locale文件夹,其中包含2个文件messages.en.xlf(和message.it.xlf);这是en版本的示例.
1) Define translation text. No problem, I created a folder src/locale folder with 2 files messages.en.xlf (and message.it.xlf); here is an example for en version.
<trans-unit id="introductionHeader" datatype="html">
<source>Hello i18n! (en-EN)</source>
<note priority="1" from="description">An introduction header for this sample</note>
<note priority="1" from="meaning">User welcome</note>
</trans-unit>
2)将此文本链接到带有适当标签的html页面,这里也没有问题,在我的app.translations.html中有我的示例标签.
2) link this text to html pages with appropriates tag, and also here no problem, there is my example tag in my app.translations.html.
<h1 i18n="User welcome|An introduction header for this sample">
Hello i18n!
</h1>
现在,我阅读了启动过程中本地化应用程序的方式(第3阶段)(在Angular.json文件中进行一些编辑,然后使用配置选项启动ng服务);但是,相反,我将以编程方式更改应用程序的语言.换句话说,我想要一个诸如
Now, I read the way (3. phase) to localize the app during startup (some editing in Angular.json file and start ng serve with configuration option); but, instead of this, I would change the language of the app programmatically. In other words, I want a command such as
SwitchAppLanguage('en')
,例如,以便用户可以通过按钮自行更改它,或者应用程序可以读取浏览器的默认语言来进行更改.我该怎么办?
for example, so that the user can change it self by a button or the app can do this reading the browser default language. How can I do this?
非常感谢!
我试图以这种方式编辑我的angular.json文件
I tried to edit my angular.json file in this way
"configurations": {
"production": {
"i18nFile": "src/locale/messages.it.xlf",
"i18nFormat": "xlf",
"i18nLocale": "it",
(...)
而且,在ng构建并提供ng服务后,我希望看到意大利语文本,但这种情况不会发生(并且该应用程序可以正常启动并提供服务).我怎么了谢谢!
And, after ng build and ng serve, I expect to see the italian text but it doesn't happens (and the app start and serve correctly). What do I wrong? Thanks!
推荐答案
因此,如果您使用JIT,则可以使用webpacks loader来热交换语言文件:
So if you use JIT, you can use webpacks loader to hotswap language files:
main.ts
import { enableProdMode } from '@angular/core';
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { AppModule } from './app/app.module';
import { environment } from './environments/environment';
import { getTranslationProviders } from './app/providers/i18n.provider';
import { LocaleService } from './app/services/locale.service';
if ( environment.production ) {
enableProdMode();
}
const locale = new LocaleService();
locale.getLocale().then( ( localeValue ) => {
getTranslationProviders( localeValue ).then( providers => {
platformBrowserDynamic().bootstrapModule( AppModule, { providers } )
.catch( err => console.log( err ) );
} );
} );
i18n.provider
import { TRANSLATIONS, TRANSLATIONS_FORMAT } from '@angular/core';
declare const require;
export function getTranslationProviders( locale: string ): Promise<any[]> {
// Get the locale id as arugment or from the global
//
const localeValue = locale || document[ 'locale' ] as string;
// return no providers if fail to get translation file for locale
//
const noProviders: Object[] = [];
// No locale or AU, doesn't require translation
//
if ( !localeValue || localeValue === 'au' ) {
return Promise.resolve( noProviders );
}
try {
const translations = require( `raw-loader!../../locale/messages.${ localeValue }.xlf` );
return Promise.resolve( [
{ provide: TRANSLATIONS, useValue: translations },
{ provide: TRANSLATIONS_FORMAT, useValue: 'xlf' }
] );
} catch ( error ) {
console.error( error );
return Promise.resolve( noProviders );
}
}
和 local.service
import { WindowRef } from 'app/services/windowRef.service';
import { environment } from 'environments/environment';
@Injectable()
export class LocaleService {
_locale: string;
set locale( val: string ) {
this._locale = val;
}
get locale() {
return this._locale;
}
constructor() {
this.setLocale();
}
setLocale() {
const winRef = new WindowRef();
this.locale = ( environment.countryLookup[ document.location.hostname ] || 'au' ).toLowerCase();
const match = document.location.search.match( /au|nz/ );
if ( match ) {
this.locale = match.shift();
}
// store locale in document
//
winRef.nativeWindow.document.locale = this.locale;
}
getLocale(): Promise<string> {
return Promise.resolve( this.locale );
}
}
您将不得不对其进行一些重构以匹配您的项目,但是我希望您能掌握要点. 在Ivy支持正确的语言切换之前,这可能是一个解决方案.
You will have to refactor it a bit to match your project, but I hope you get the gist. This might be a solution until Ivy supports proper language switching.
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