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gaia/apps/email/js/message_display.js

@@ -0,0 +1,31 @@
+'use strict';
+
+/**
+ * Helpers for displaying information about email messages.
+ */
+define(function(require) {
+  var mozL10n = require('l10n!');
+
+  return {
+    /**
+     * Format the message subject appropriately.  This means ensuring that
+     * if the subject is empty, we use a placeholder string instead.
+     *
+     * @param {DOMElement} subjectNode the DOM node for the message's
+     * subject.
+     * @param {Object} message the message object.
+     */
+    subject: function(subjectNode, message) {
+      var subject = message.subject && message.subject.trim();
+      if (subject) {
+        subjectNode.textContent = subject;
+        subjectNode.classList.remove('msg-no-subject');
+        subjectNode.removeAttribute('data-l10n-id');
+      }
+      else {
+        mozL10n.setAttributes(subjectNode, 'message-no-subject');
+        subjectNode.classList.add('msg-no-subject');
+      }
+    }
+  };
+});