Display the language name and the input method list dynamically.

chrome/browser/resources/options/chromeos_language_options.js

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 ///////////////////////////////////////////////////////////////////////////////
 // LanguageOptions class:
 
 /**
  * Encapsulated handling of ChromeOS language options page.
  * @constructor
  */
 function LanguageOptions(model) {
   OptionsPage.call(this, 'language', localStrings.getString('languagePage'),
                    'languagePage');
 }
 
 cr.addSingletonGetter(LanguageOptions);
 
 // Inherit LanguageOptions from OptionsPage.
 LanguageOptions.prototype = {
   __proto__: OptionsPage.prototype,
 
   /**
    * Initializes LanguageOptions page.
    * Calls base class implementation to starts preference initialization.
    */
   initializePage: function() {
     OptionsPage.prototype.initializePage.call(this);
 
-    options.language.LanguageList.decorate($('language-options-list'));
+    var languageOptionsList = $('language-options-list');
+    options.language.LanguageList.decorate(languageOptionsList);
+
+    languageOptionsList.addEventListener('change',
+        cr.bind(this.handleLanguageOptionsListChange_, this));
 
     this.addEventListener('visibleChange',
                           cr.bind(this.handleVisibleChange_, this));
+
+    this.initializeInputMethodList_();
   },
 
   languageListInitalized_: false,
 
   /**
+   * Initializes the input method list.
+   */
+  initializeInputMethodList_: function() {
+    var inputMethodList = $('language-options-input-method-list');
+    var inputMethodListData = templateData.inputMethodList;
+
+    // Add all input methods, but make all of them invisible here. We'll
+    // change the visibility in handleLanguageOptionsListChange_() based
+    // on the selected language. Note that we only have less than 100
+    // input methods, so creating DOM nodes at once here should be ok.
+    for (var i = 0; i < inputMethodListData.length; i++) {
+      var inputMethod = inputMethodListData[i];
+      var input = document.createElement('input');
+      input.type = 'checkbox';
+      input.inputMethodId = inputMethod.id;
+
+      var label = document.createElement('label');
+      label.appendChild(input);
+      label.appendChild(document.createTextNode(inputMethod.displayName));
+      label.style.display = 'none';
+      label.languageCode = inputMethod.languageCode;
+
+      inputMethodList.appendChild(label);
+    }
+  },
+
+  /**
    * Handler for OptionsPage's visible property change event.
    * @param {Event} e Property change event.
+   * @private
    */
   handleVisibleChange_ : function(e) {
     if (!this.languageListInitalized_ && this.visible) {
       this.languageListInitalized_ = true;
       $('language-options-list').redraw();
     }
+  },
+
+  /**
+   * Handler for languageOptionsList's change event.
+   * @param {Event} e Change event.
+   * @private
+   */
+  handleLanguageOptionsListChange_: function(e) {
+    var languageOptionsList = $('language-options-list');
+    var index = languageOptionsList.selectionModel.selectedIndex;
+    if (index == -1)
+      return;
+
+    var languageCode = languageOptionsList.dataModel.item(index);
+    var languageDisplayName = localStrings.getString(languageCode);
+
+    $('language-options-language-name').textContent = languageDisplayName;
+    // TODO(satorux): The button text should be changed to
+    // 'is_displayed_in_this_language', depending on the current UI
+    // language.
+    $('language-options-ui-language-button').textContent = (
+        localStrings.getString('display_in_this_language'));
+
+    // Change the visibility of the input method list. Input methods that
+    // matches |languageCode| will become visible.
+    var inputMethodList = $('language-options-input-method-list');
+    var labels = inputMethodList.querySelectorAll('label');
+    for (var i = 0; i < labels.length; i++) {
+      if (labels[i].languageCode == languageCode) {
+        labels[i].style.display = 'block';
+      } else {
+        labels[i].style.display = 'none';
+      }
+    }
   }
 };