【问题标题】:How to translate a key inside another translation in ngx-translate如何在 ngx-translate 中翻译另一个翻译中的键
【发布时间】:2020-03-20 10:09:08
【问题描述】:
我有一个翻译 JSON 文件,我想在不同翻译的值内翻译另一个翻译。
{
"COMPANY_NAME": "Apple",
"WELCOME_TEXT": "{{ COMPANY_NAME }} welcomes you to California!"
}
我看不到如何在 Angular 9 中使用 ngx-translate 执行此操作,谁能给我指点?
【问题讨论】:
标签:
angular
ngx-translate
【解决方案1】:
我设法通过实现自定义TranslateCompiler 来实现这一点,如下所示:
我的app.module.ts:
// ...
imports: [
TranslateModule.forRoot({
compiler: { provide: TranslateCompiler, useClass: CustomTranslationCompiler }
})
]
/// ...
我的CustomTranslationCompiler.ts:
import { TranslateCompiler } from '@ngx-translate/core';
export class CustomTranslationCompiler implements TranslateCompiler {
/**
* This function is needed to implement the interface, but doesn't
* actually seem to be used anywhere
*
* @param value The translation value
* @param lang The current language
*/
public compile(value: string, lang: string): string | Function {
return value;
}
/**
* Look at every translation and pre-translate any nested translation keys within them
*
* @param translations All of the translations for the app to be compiled
* @param lang The current language
*/
public compileTranslations(translations: any, lang: string): any {
for (const key in translations) {
if (translations.hasOwnProperty(key)) {
translations[key] = this.translateNestedTranslation(translations[key], translations);
}
}
return translations;
}
/**
* Use a regex to search for and replace translations inside translations
* with their translated value
*
* @param value The translation value
* @param translations All of the translations for the app
*/
private translateNestedTranslation(value: string, translations: Object): string {
const searchRegex = /{{\s([A-Z_:]*)\s?}}/g;
const replaceRegex = /({{\s?[A-Z_:]*\s?}})/g;
const matches = searchRegex.exec(value);
if (matches && matches.length > 0) {
const searchKey = matches[1];
if (translations.hasOwnProperty(searchKey)) {
// Replace the full translate syntax with the translated value
value = value.replace(replaceRegex, translations[searchKey]);
} else {
// If we can't find the value, display only the missing key instead of the full translate syntax
value = value.replace(replaceRegex, searchKey);
console.error(`Error: Unable to find translation '${searchKey}'!`)
}
}
return value;
}
}
一些注意事项:
- 使用这种方法,翻译值中定义的任何翻译参数都必须为小写,否则搜索正则表达式无法匹配
- 搜索和替换正则表达式不同
- 我不确定为什么永远不会调用
compile() 方法。我的翻译是作为一个对象到达的,所以也许这就是为什么......