@wellwind/ngx-easy-translate
v1.0.3
Published
An easy to use, strong typed i18n Angular library.
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NgxEasyTranslate
An easy to use, strong typed i18n Angular library.
Feature
- Internationalization.
- STRONG TYPED supported.
- Lazy load languages supported.
- Lazy load languages by seperated feature modules suppported.
Getting Started
Basic Usage
- Install package
npm install @wellwind/ngx-easy-translate
- Prepare your language loader, and register to
NgxEasyTranslateModule
.
import { NgxEasyTranslateModule } from '@wellwind/ngx-easy-translate';
import { of } from 'rxjs';
@NgModule({
...,
imports: [
...,
NgxEasyTranslateModule.forRoot({
defaultLang: 'en',
loader: (lang: string) => {
if(lang === 'en') {
return of({
title: 'Home',
profile: {
name: 'Your Name'
},
sayHi: (name) => `Greeting, ${name}.`
});
} else if(lang === 'zh'){
return of({
title: '首頁',
profile: {
name: '你的名字',
},
sayHi: (name) => `哈囉,${name}。`
});
}
}
})
]
})
Inject
ROOT_TRANSLATE
to get language, it's an Observable.If need change language, inject
NgxEasyTranslateService
and callchangeCurrentLanguage()
.
import { Component, OnInit, Inject } from '@angular/core';
import { NgxEasyTranslateService, ROOT_TRANSLATE } from '@wellwind/ngx-easy-translate';
import { Observable } from 'rxjs';
@Component({
selector: 'app-root',
template: `
<h1>{{ (translate | async)?.title }}</h1>
<button (click)="changeLang('en')">EN</button>
<button (click)="changeLang('zh')">ZH</button>
`,
})
export class AppComponent {
get translate() { return this.rootTranslate; }
constructor(
private translateService: NgxEasyTranslateService,
@Inject(ROOT_TRANSLATE) private rootTranslate: Observable<any>) { }
changeLang(lang: string) {
this.translateService.changeCurrentLanguage(lang);
}
}
- There are also a
translate
pipe, then we don't have to inject anything.
{{ 'profile.name' | translate }}
- Because languages are writing in TypeScript, not just a json, so we can programing anything.
const greeting = this.rootTranslate.sayHi('Mike');
Support Strong Type
Because all languages are in TypeScript file, is't easy to make it strong typed.
Here are simple steps to make translation strong typed.
- Writing first translation in TypeScript.
- in
i18n/en.ts
export const lang = {
title: 'Home'
}
- Define type.
- in
i18n/type.ts
import { en } from './en';
export type Translate = typeof en;
- In another translation file, use the type defined above.
- in
i18n/zh.ts
import { Translate } from './type';
export const lang: Translate = {
title: '首頁'
}
- Refactor the module.
import { en } from './i18n/en';
import { zh } from './i18n/zh';
import { of } from 'rxjs';
...
NgxEasyTranslateModule.forRoot(
defaultLang: 'en',
loader: (lang: string) => {
if(lang === 'en') {
return of(en);
} else if(lang === 'zh'){
return of(zh);
}
})
- Now we can use the type we defined
import { Translate } from './type';
export class AppComponent {
constructor(
@Inject(ROOT_TRANSLATE) private rootTranslate: Observable<Translate>) { }
}
Support Lazy Loading
The key point is the loader function, we can write any logic to load translation content, and thanks for dynamic import, it's very easy to seperate language file by using import()
.
NgxEasyTranslateModule.forRoot(
defaultLang: 'en',
loader: (lang: string) => {
if(lang === 'en') {
return from(import('./i18n/en').then(result => result.lang));
} else if(lang === 'zh'){
return from(import('./i18n/zh').then(result => result.lang));
}
});
Or just like this:
loader: (lang: string) => from(import(`./i18n/${lang}`)).pipe(map(result => result.lang))
The important thing is now en.ts
, zh.ts
was never used explicitly, we will got errors when compile the project.
We have to include these files in tsconfig.app.json
.
"include": [
...
"src/app/**/i18n/**/*.ts"
]
Support Lazy Loading By Feature Module
We may not want to write all translation content in one file (imagine 1000+ pages), sometimes we need lazily load languages by every feature module.
To acheieve that, put your loader to NgxEasyTranslateModule.forFeature()
NgxEasyTranslateModule.forFeature((lang) => from(import(`./i18n/${lang}`).then(result => result.lang)))
Then we can write own own translate file for seperated feature module.
In component, we can inject FEATURE_TRANSLATE
to get the current language translaction for the feature.
import { ROOT_TRANSLATE, FEATURE_TRANSLATE } from '@wellwind/ngx-easy-translate';
export class FeatureComponent {
constructor(
@Inject(ROOT_TRANSLATE) private rootTranslate: Observable<RootTranslate>,
@Inject(FEATURE_TRANSLATE) private featureTranslate: Observable<FeatureTranslate>) { }
}
Release Notes
v1.0.0
- Just publish package.
Help Wanted
Because English is not my major language. This document should have many incorrect things. If you think this package is useful, please proofread and send a PR to me. Thank you :)
LICENSE
MIT