Transifex Native is a full end-to-end, cloud-based localization stack for moderns apps.
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Transifex Native SDK: Angular i18n
Angular library for localizing Angular application using
Transifex Native.Related packages:
Learn more about Transifex Native in the Transifex Developer Hub.
How it works
Step1: Create a Transifex Native project in Transifex.Step2: Grab credentials.
Step3: Internationalize the code using the SDK.
Step4: Push source phrases using the
@transifex/cli
tool.Step5: Translate the app using over-the-air updates.
No translation files required.
Upgrade to v2
If you are upgrading from the1.x.x
version, please read this migration guide, as there are breaking changes in place.Table of Contents
Initialization T Component UT Component TranslationService service @T Decorator translate Pipe Language Picker Component TX Instance Component txLoadTranslations DirectiveRequirements
Angular 16 is required. If you are using Angular 14 or 15, please use the 6.x.x
version of
Transifex Native related packages. If you are using Angular 12 or 13, please use the 5.x.x
version of
Transifex Native related packages. If you are using Angular 11, please use the 1.x.x
version of
Transifex Native related packages. Other Angular versions are not officially supported at the moment.Installation
Install the library and its dependencies using:npm install @transifex/native @transifex/angular --save
Usage
Initialization
In order to use the TX Native object globally, it is necessary to initialize the library in the angular application bootstrap, in two locations:- NgModule initialization
@NgModule({
declarations: [
AppComponent,
LoginComponent,
TermsComponent,
HomeComponent,
PrivacyComponent
],
imports: [
AppRoutingModule,
BrowserModule,
// TX Native module declaration
TxNativeModule.forRoot(),
],
providers: [,
],
bootstrap: [AppComponent]
})
- Application Boostrap
import { Component } from '@angular/core';
import { TranslationService } from '@transifex/angular';
@Component({
selector: 'app-root',
templateUrl: './app.component.html',
styleUrls: ['./app.component.scss']
})
export class AppComponent {
constructor(private translationService: TranslationService) {
// TX Native library intialization
translationService.init({
token: '----- here your TX Native token ------',
});
}
async ngOnInit() {
await this.translationService.getLanguages();
await this.translationService.setCurrentLocale('el');
}
}
T
Component
<p>
<label>
<T str="Password" key="label.password"></T>
</label>
<input type="password" name="password" />
</p>
Available optional props:
| Prop | Type | Description | |------------|---------|---------------------------------------------| | context | String | String context, affects key generation | | key | String | Custom string key | | comment | String | Developer comment | | charlimit | Number | Character limit instruction for translators | | tags | String | Comma separated list of tags | | escapeVars | Boolean | If escaping should be applied to ICU variables | | sanitize | Boolean | Safe render of the HTML result after translation takes place | | vars | Object | ICU variables to render in the string |
The T component can sanitize the translated result if HTML is involved, using the parameter
sanitize
, ie this would be possible:<p>
<T
str="By proceeding you agree to the {terms_of_services} and {privacy_policy}."
key="text.agree_message"
[sanitize]=true
[vars]="{ terms_of_services: '<a href=\'terms\'>' + terms + '</a>',
privacy_policy: '<a href=\'privacy\'>' + privacy + '</a>'
}">
</T>
</p>
This will render like this in English:
<span>By proceeding you agree to the <a href="terms">terms of service</a> and <a href="privacy">privacy policy</a>.</span>
And like this in Greek:
<span>Συνεχίζοντας, αποδέχεστε τους <a href="terms">όροι χρήσης</a> και τους <a href="privacy">πολιτική απορρήτου</a>.</span>
The same block without the
sanitize
option would be like this, for Greek:Συνεχίζοντας, αποδέχεστε τους <a href='terms'>όροι χρήσης</a> και τους <a href='privacy'>πολιτική απορρήτου</a>.
The main thing to keep in mind is that the
str
property to the T component
must always be a valid ICU message format template.If it is nested into a ``
tx-instance
` tag, then the
`T component
`` will use the new instance to fetch the translation. Check the TX Instance Component section for more information about additional instances.UT
Component
<p>
<UT
str="Copyright {year} by Transifex."
key="text.copyright"
[inline]=false
comment="This is the current year"
[vars]="{ year: '© 2020' }">
</UT>
</p>
UT
has the same behaviour as T
, but renders source string as HTML inside a
div
tag or a span
tag if inline
property is true. By default this property
is set to false
.Available optional props:
| Prop | Type | Description | |------------|---------|---------------------------------------------| | inline | Boolean | If should wrap the translation with
span
(true) or with div
(false) |If it is nested into a ``
tx-instance
` tag, then the
`UT component
`` will use the new instance to fetch the translation. Check the TX Instance Component section for more information about additional instances.TranslationService
service
This is the main service exposed from the SDK in order to intialize the TX Native object.In your bootstrap entry point in the Angular application, you should initialize the SDK, like this:
import { Component } from '@angular/core';
import { TranslationService } from '@transifex/angular';
@Component({
selector: 'app-root',
templateUrl: './app.component.html',
styleUrls: ['./app.component.scss']
})
export class AppComponent {
title = 'TX Native Angular Demo';
constructor(private translationService: TranslationService) {
translationService.init({
token: '----- here your TX Native token ------',
});
}
async ngOnInit() {
await this.translationService.getLanguages();
await this.translationService.setCurrentLocale('el');
}
}
The translation service is a singleton
instance so the initialization will be shared across the whole application.It keeps also a collection of additional TX Native instances which can be added to the default instance for specific purposes.
Each addional instance should have the following configuration:
ITXInstanceConfiguration {
token: string;
alias: string;
controlled: boolean;
}
See the section TX Instance Component for more details.
The additional instances can be added and retrieved using exposed methods ``
addInstance
` and
`getInstance
``.The translation service also offers the possibility to retrieve translations that match a given list of tags, this way it's possible to fetch groups of translations in batches, at different times or for lazy loading. This can be achieved using the ``
fetchTranslations
`` method.Exposes the following methods and properties:
| Method | Parameters | Description | |------------------|------------------|---------------------------------------------------| | init | config 1 | Initializes the TX Native object | | setCurrentLocale | locale | Set the current locale in the TX Native object | | getCurrentLocale | none | Returns the current locale of the TX Native object| | getLanguages | none | Returns an array of available languages | | translate | translate params 2 | Returns the translation for a string with given translation params | | localeChanged | none | Returns an observable for monitoring the locale changed event | | translationsFetched | none | Returns an observable for monitoring the fetch translations event | | addInstance | ITXInstanceConfiguration | Returns true if the new TX Native instance was added succesfully and false otherwise | | getInstance | string | Returns the TX Native instance with the given alias. If the operation is not possible the default one is returned as fallback. | | fetchTranslations | array | Returns a collection of translations that match a given list of tags. |
(1) Initialization config
export interface ITranslationServiceConfig {
token: string;
cdsHost?: string;
filterTags?: string;
filterStatus?: string;
cache?: () => void;
missingPolicy?: IPolicy;
errorPolicy?: IPolicy;
stringRenderer?: IStringRenderer;
}
cache
,missingPolicy
,errorPolicy
andstringRenderer
are set by default by
@transifex/native
package but you can provide if you wish custom functions
of your own, or use another policy provided by the @transifex/native
package.Please check the documentation related to this on
@transifex/native
package here.(2) Translation params
str: string // string to be translated
params: Record<string, unknown> // an object with the params and variables
The params should follow the interface:
export interface ITranslateParams {
_context?: string;
_comment?: string;
_charlimit?: number;
_tags?: string;
_key?: string;
_escapeVars?: boolean;
_inline?: boolean;
sanitize?: boolean;
}
@T
Decorator
This is a decorator for using inside classes and components in order to have
properties with the translation and used them in code and templates.An example of use is the following:
import { Component, OnInit } from '@angular/core';
import { Router } from '@angular/router';
import { T, TranslationService } from '@transifex/angular';
@Component({
selector: 'app-login',
templateUrl: './login.component.html',
styleUrls: ['./login.component.scss']
})
export class LoginComponent implements OnInit {
// Translations using decorator
@T('Monday', { _key: 'text.monday' })
weekday: string;
@T('terms of service', { _key: 'text.terms_of_service' })
terms: string;
@T('privacy policy', { _key: 'text.privacy_policy' })
privacy: string;
constructor(
private translationService: TranslationService,
private router: Router) {}
login() {
this.router.navigateByUrl('home');
}
}
and the use of the properties in the template:
<p>
<T
str="By proceeding you agree to the {terms_of_services} and {privacy_policy}."
key="text.agree_message"
[sanitize]=true
[vars]="{ terms_of_services: '<a href=\'#/terms\'>' + terms + '</a>',
privacy_policy: '<a href=\'#/privacy\'>' + privacy + '</a>'
}"
></T>
</p>
An instance configuration can be passed to the decorator in order to use an alternative instance instead of the main TX Native one.See TX Instance Component for more information.
Example of alternative instance:
const INSTANCE_CONFIG = {
token: 'XXXXXXXXXXXXXXXXXXXXXXXXXXXX',
alias: 'mycmppage',
controlled: true,
};
@Component({
selector: 'my-component',
templateUrl: './my.component.html',
styleUrls: ['./my.component.scss']
})
export class MyComponent implements OnInit {
@T('My string', { _key: 'text.my_string' }, INSTANCE_CONFIG)
myString: string;
translate
Pipe
You have available a translate
pipe for inline strings translations, the only limitation that it has is that
you cannot translate strings with embedded HTML.These examples will work:
{{ 'Copyright {year} by Transifex' | translate:{ _key: 'text.copyright' } }}
<p [matTooltip]="'A paragraph' | translate">A paragraph</p>
this example will not work, as it has HTML embedded:
{{ 'A string with <b>HTML embedded</b>' | translate }}
If it is nested into a ``
tx-instance
`` tag, then the pipe will use the new instance to fetch the translation. Check the TX Instance Component section for more information about additional instances.Language Picker Component
Renders a<select>
tag that displays supported languages and switches the
application's selected language on change.
Uses Translation Service
internally.The html selector is
tx-language-picker
.This is an example of use for the language picker component:
<tx-language-picker
className="placeBottomLeft"
(localeChanged)="onLocaleChanged($event)"></tx-language-picker>
and the event for locale changed inside the component could be:
import { Component, OnInit } from '@angular/core';
import { Router } from '@angular/router';
import { T, TranslationService } from '@transifex/angular';
@Component({
selector: 'app-login',
templateUrl: './login.component.html',
styleUrls: ['./login.component.scss']
})
export class LoginComponent implements OnInit {
onLocaleChanged(event) {
// here we can do any action when locale changes
}
}
Accepts properties:className
: The CSS class that will be applied to the<select>
tag
Returns:
localeChanged
: event for handling the change of locale
You always can implement a language picker of your choice, injecting the
TranslationService
and using the different methods provided,
such as getLanguages
.TX Instance Component
Creates a new TX Native instance with the given configuration and adds it to the TX Native main instance. All the nested components will use the new instance in order to fetch the translations. This apply to components:- T/UT
- translate pipe
Uses
Translation Service
internally to add the instance.The html selector is
tx-instance
.This is an example of use for the instance component:
this.instanceConfig = {
token: 'XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX',
alias: 'homepage',
controlled: true,
};
<tx-instance
[token]="instanceConfig?.token"
[alias]="instanceConfig?.alias"
[controlled]="instanceConfig?.controlled"
(instanceReady)="onInstanceReady($event)"
>
<T str="My brand new string"></T>
</tx-instance>
Accepts properties:
token
: The token for the new instance.
alias
: A string indetifier of the instance, should be unique. If the identifier already exists, the existing instance with the given alias is used, and no new instance is created.
controlled
: If the new instance is controlled (locale) by the main TX Native instance.
Returns:
instanceReady
: event for handling the readiness of the new instance.
Exposes:
instanceIsReady
: observable for listening the readiness of the new instance.
txLoadTranslations
Directive
This directive can be used within any html or angular tag in order to force a group of translations to be fetched, using a list of tags to retrieve the translations that match.This is an example of use:
<p class="small-text" [txLoadTranslations]="'menu'">
<a href="#/home">
<UT str="home" key="text.home" inline=true></UT>
</a>
<a href="#/terms">
<UT str="terms of service" key="text.terms_of_service" inline=true></UT>
</a>
<a href="#/privacy">
<UT str="privacy policy" key="text.privacy_policy" inline=true></UT>
</a>
<a class="align-right" href="#/login">
<UT str="logout" key="text.logout" inline=true></UT>
</a>
</p>
All the translations with the tag ``
menu
`` will be fetched using the current selected locale and instance, if the translations are already cached, they are not fetched again.This way we can fetch the translations related with the part of the component's template when the component is first used and not from the beginning when instance is initialized (in the initialization we can use the ``
filterTags
`` param in order to fetch an initial set of translations and then use the lazy loading and improve the performance).License
Licensed under Apache License 2.0, see LICENSE file.