这是我最终做的解决方案。效果非常好,而且我还学会了使用 $.Deferred,这很棒!
对我来说,关键是在代码中使用 require 文本插件作为加载器。
默认语言环境设置为依赖项,这样它也可以在构建中烘焙。
解释在下面的代码中:
//in translator.js
define(function (require) {
"use strict";
var $ = require("jquery");
var _ = require("underscore");
var Jed = require("jed");
var text = require("text");
var defaultDictionary = require("json!locales/en_US.json");
var Translator;
Translator = (function () {
var DEFAULT_LOCALE = "en_US";
var defaultLocaleData = {
locale: DEFAULT_LOCALE,
dictionary: defaultDictionary
};
var createTranslator = function (localeData) {
//create the actual Jed instance with the relevant dictionary
var i18n = new Jed({
"domain": "messages",
"locale_data": localeData.dictionary
});
return i18n;
};
var parseLocaleDictionary = function (locale, dictionary) {
//parse the dictionary JSON string loaded by text plugin...
//handle errors in parsing if needed
};
//get to work here
var getTranslatorForLocale = function (locale) {
//$gettingData promise will be resolved when data for Jed is loaded and ready
var $gettingData = $.Deferred();
//$creatingTranslator promise will be returned to caller and will be resolved when everything's done
var $creatingTranslator = $.Deferred();
if (!locale || locale === DEFAULT_LOCALE) {
//default locale, so resolve right away because we required it already
$gettingData.resolve(defaultLocaleData);
}
else {
//need to load the dictionary from here
var dictionaryUrl = require.toUrl("locales/" + locale + ".json");
//this is the dynamic loading
text.get(
dictionaryUrl,
function (dictionary) {
//if successful, parse the JSON string and use that dictionary
var localeData = parseLocaleDictionary(locale, dictionary);
$gettingData.resolve(localeData);
},
function (error) {
//on load error, use the default and resolve promise
$gettingData.resolve(defaultLocaleData);
});
}
//once the data is ready, we can create the translator instance
$gettingData.done(function (localeData) {
var i18n = createTranslator(localeData);
//notify caller that translator is ready
$creatingTranslator.resolve(i18n);
});
return $creatingTranslator.promise();
};
return {
//this function is returned to the user of Translator
getTranslator: function (locale) {
var $gettingTranslator = getTranslatorForLocale(locale);
return $gettingTranslator;
}
};
}());
return Translator;
});
//in app.js
define(function (require) {
var Translator = require("translator");
//in app.js
var myTranslator;
var userLocale = "fr_FR";
//this is a promise that will be resolved when translator is ready
var $getTranslator = Translator.getTranslator(userLocale);
//when translator is ready, store it
$getTranslator.done(function (translator) {
myTranslator = translator;
});
//...
});