Add beforeUnload handler to confirm exit.

remoting/webapp/me2mom/remoting.js

 // Copyright (c) 2011 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.
 
 var remoting = remoting || {};
 
 (function() {
 'use strict';
 
 window.addEventListener('blur', pluginLostFocus_, false);
@@ skipping 171 matching lines @@
     var hidden = true;
     for (var m = 0; m < modes.length; ++m) {
       if (hasClass(element.getAttribute('data-ui-mode'), modes[m])) {
         hidden = false;
         break;
       }
     }
     element.hidden = hidden;
   }
   remoting.debug.log('App mode: ' + mode);
-  remoting.currentMode = modes[0];
+  remoting.currentMode = mode;
+}
+
+/**
+ * Get the major mode that the app is running in.
+ * @return {remoting.Mode} The app's current major mode.
+ */
+remoting.getMajorMode = function(mode) {
+  return remoting.currentMode.split('.')[0];
 }
 
 remoting.tryShare = function() {
   remoting.debug.log('Attempting to share...');
   if (remoting.oauth2.needsNewAccessToken()) {
     remoting.debug.log('Refreshing token...');
     remoting.oauth2.refreshAccessToken(function() {
       if (remoting.oauth2.needsNewAccessToken()) {
         // If we still need it, we're going to infinite loop.
         showShareError_('unable-to-get-token');
@@ skipping 310 matching lines @@
       }
       remoting.doTryConnect();
     });
   } else {
     remoting.doTryConnect();
   }
 }
 
 remoting.cancelPendingOperation = function() {
   document.getElementById('cancel-button').disabled = true;
-  if (remoting.currentMode == remoting.AppMode.HOST) {
+  if (remoting.getMajorMode() == remoting.AppMode.HOST) {
     remoting.cancelShare();
   }
 }
 
 /**
  * Changes the major-mode of the application (Eg., client or host).
  *
  * @param {remoting.AppMode} mode The mode to shift the application into.
  * @return {void} Nothing.
  */
@@ skipping 49 matching lines @@
  */
 remoting.disconnect = function() {
   if (remoting.session) {
     remoting.session.disconnect();
     remoting.session = null;
     remoting.debug.log('Disconnected.');
     remoting.setMode(remoting.AppMode.CLIENT_SESSION_FINISHED);
   }
 }
 
+/** If the client is connected, or the host is shared, prompt before closing.
+ *
+ * @return {string|void} The prompt string if a connection is active.
+ */
+remoting.promptClose = function() {
+  var token = null;

[awong, 2011/08/05 23:17:25]

How about messageId instead of token

[Jamie, 2011/08/05 23:36:51]

Done.

+  if (remoting.getMajorMode() == remoting.AppMode.HOST &&
+      remoting.currentMode != remoting.AppMode.HOST_UNSHARED) {
+    token = 'closePromptHost';
+  } else if (remoting.getMajorMode() == remoting.AppMode.IN_SESSION ||
+             remoting.currentMode == remoting.AppMode.CLIENT_CONNECTING) {
+    token = 'closePromptClient';
+  }
+  if (token) {
+    var result = chrome.i18n.getMessage(token);
+    return result;
+  }
+}
+
 }());