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gaia/apps/sms/views/shared/js/localization_helper.js

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+/* exported LocalizationHelper */
+(function(exports) {
+  'use strict';
+
+  /**
+   * Look for attachment iframes and localize them - l20n.js doesn't do this
+   * XXX: remove once bug 1020130 is fixed
+   */
+  function localizeAttachmentIFrames() {
+    var attachmentContainers = Array.from(document.querySelectorAll(
+      'iframe.attachment-container'
+    ));
+
+    return Promise.all(
+      attachmentContainers.map(localizeAttachmentIFrame)
+    );
+  }
+
+  /**
+   * Localize an attachment iframe
+   */
+  function localizeAttachmentIFrame(attachmentContainer) {
+    var doc = attachmentContainer.contentDocument;
+    doc.documentElement.lang = document.documentElement.getAttribute('lang');
+    doc.documentElement.dir = document.documentElement.getAttribute('dir');
+    return document.l10n.translateFragment(doc.body);
+  }
+
+  /**
+   * Look for time elements with format and re-translate the date message.
+   * More complex because the argument to the l10n string is itself a formatted
+   * date using l10n.
+   * @param {boolean} isTimeFormatChanged Indicates that time format has been
+   * changed and we need to update only elements with time aware formats.
+   */
+  function localizeDateTime(isTimeFormatChanged) {
+    var dateTimeElements = document.querySelectorAll('.l10n-contains-date');
+
+    Array.forEach(dateTimeElements, function(element) {
+      if (!element.dataset.l10nDate) {
+        return;
+      }
+
+      var formatL10nId = element.dataset.l10nDateFormat;
+
+      if (!formatL10nId) {
+        return;
+      }
+
+      formatL10nId = JSON.parse(formatL10nId);
+
+      if (isTimeFormatChanged && !formatL10nId.hour) {
+        return;
+      }
+      formatL10nId.hour12 = navigator.mozHour12;
+
+      var formatter = new Intl.DateTimeFormat(
+        navigator.languages, formatL10nId
+      );
+      var localeData = formatter.format(new Date(+element.dataset.l10nDate));
+
+      if (element.hasAttribute('data-l10n-id') &&
+          element.hasAttribute('data-l10n-args')) {
+        var l10nAttrs = document.l10n.getAttributes(element);
+        l10nAttrs.args.date = localeData;
+        document.l10n.setAttributes(element, l10nAttrs.id, l10nAttrs.args);
+      } else {
+        element.textContent = localeData;
+      }
+    });
+  }
+
+  exports.LocalizationHelper = {
+    init: function () {
+      function localize() {
+        localizeDateTime();
+        return localizeAttachmentIFrames();
+      }
+
+      // After startup, call localize every time the language changes
+      document.addEventListener('DOMRetranslated', localize);
+
+      // This event is fired when time format (12h/24h) is changed
+      window.addEventListener(
+        'timeformatchange',
+        localizeDateTime.bind(null, /* isTimeFormatChanged */ true)
+      );
+
+      // Call localize during startup
+      return document.l10n.ready.then(localize);
+    }
+  };
+})(window);