app/ui.js

   1 /*
   2  * noVNC: HTML5 VNC client
   3  * Copyright (C) 2012 Joel Martin
   4  * Copyright (C) 2016 Samuel Mannehed for Cendio AB
   5  * Copyright (C) 2016 Pierre Ossman for Cendio AB
   6  * Licensed under MPL 2.0 (see LICENSE.txt)
   7  *
   8  * See README.md for usage and integration instructions.
   9  */
  10
  11 /* jslint white: false, browser: true */
  12 /* global window, document.getElementById, Util, WebUtil, RFB, Display */
  13
  14 /* [module]
  15  * import Util from "../core/util";
  16  * import KeyTable from "../core/input/keysym";
  17  * import RFB from "../core/rfb";
  18  * import Display from "../core/display";
  19  * import WebUtil from "./webutil";
  20  */
  21
  22 var UI;
  23
  24 (function () {
  25     "use strict";
  26
  27     /* [begin skip-as-module] */
  28     // Load supporting scripts
  29     WebUtil.load_scripts(
  30         {'core': ["base64.js", "websock.js", "des.js", "input/keysymdef.js",
  31                   "input/xtscancodes.js", "input/util.js", "input/devices.js",
  32                   "display.js", "inflator.js", "rfb.js", "input/keysym.js"]});
  33
  34     window.onscriptsload = function () { UI.load(); };
  35     /* [end skip-as-module] */
  36
  37     UI = {
  38
  39         rfb_state: 'loaded',
  40
  41         resizeTimeout: null,
  42         statusTimeout: null,
  43         hideKeyboardTimeout: null,
  44         controlbarTimeout: null,
  45
  46         controlbarGrabbed: false,
  47         controlbarDrag: false,
  48         controlbarMouseDownClientY: 0,
  49         controlbarMouseDownOffsetY: 0,
  50         keyboardVisible: false,
  51
  52         isTouchDevice: false,
  53         isSafari: false,
  54         rememberedClipSetting: null,
  55         lastKeyboardinput: null,
  56         defaultKeyboardinputLen: 100,
  57
  58         // Setup rfb object, load settings from browser storage, then call
  59         // UI.init to setup the UI/menus
  60         load: function(callback) {
  61             WebUtil.initSettings(UI.start, callback);
  62         },
  63
  64         // Render default UI and initialize settings menu
  65         start: function(callback) {
  66
  67             // Setup global variables first
  68             UI.isTouchDevice = 'ontouchstart' in document.documentElement;
  69             UI.isSafari = (navigator.userAgent.indexOf('Safari') !== -1 &&
  70                            navigator.userAgent.indexOf('Chrome') === -1);
  71
  72             UI.initSettings();
  73
  74             // Adapt the interface for touch screen devices
  75             if (UI.isTouchDevice) {
  76                 document.documentElement.classList.add("noVNC_touch");
  77                 // Remove the address bar
  78                 setTimeout(function() { window.scrollTo(0, 1); }, 100);
  79                 UI.forceSetting('clip', true);
  80             } else {
  81                 UI.initSetting('clip', false);
  82             }
  83
  84             // Setup and initialize event handlers
  85             UI.setupWindowEvents();
  86             UI.setupFullscreen();
  87             UI.addControlbarHandlers();
  88             UI.addTouchSpecificHandlers();
  89             UI.addExtraKeysHandlers();
  90             UI.addXvpHandlers();
  91             UI.addConnectionControlHandlers();
  92             UI.addClipboardHandlers();
  93             UI.addSettingsHandlers();
  94
  95             // Show the connect panel on first load unless autoconnecting
  96             if (!autoconnect) {
  97                 UI.openConnectPanel();
  98             }
  99
 100             UI.updateViewClip();
 101
 102             UI.updateVisualState();
 103
 104             document.getElementById('noVNC_setting_host').focus();
 105
 106             var autoconnect = WebUtil.getConfigVar('autoconnect', false);
 107             if (autoconnect === 'true' || autoconnect == '1') {
 108                 autoconnect = true;
 109                 UI.connect();
 110             } else {
 111                 autoconnect = false;
 112             }
 113
 114             if (typeof callback === "function") {
 115                 callback(UI.rfb);
 116             }
 117         },
 118
 119         initSettings: function() {
 120             // Stylesheet selection dropdown
 121             var sheet = WebUtil.selectStylesheet();
 122             var sheets = WebUtil.getStylesheets();
 123             var i;
 124             for (i = 0; i < sheets.length; i += 1) {
 125                 UI.addOption(document.getElementById('noVNC_setting_stylesheet'),sheets[i].title, sheets[i].title);
 126             }
 127
 128             // Logging selection dropdown
 129             var llevels = ['error', 'warn', 'info', 'debug'];
 130             for (i = 0; i < llevels.length; i += 1) {
 131                 UI.addOption(document.getElementById('noVNC_setting_logging'),llevels[i], llevels[i]);
 132             }
 133
 134             // Settings with immediate effects
 135             UI.initSetting('logging', 'warn');
 136             WebUtil.init_logging(UI.getSetting('logging'));
 137
 138             UI.initSetting('stylesheet', 'default');
 139             WebUtil.selectStylesheet(null);
 140             // call twice to get around webkit bug
 141             WebUtil.selectStylesheet(UI.getSetting('stylesheet'));
 142
 143             // if port == 80 (or 443) then it won't be present and should be
 144             // set manually
 145             var port = window.location.port;
 146             if (!port) {
 147                 if (window.location.protocol.substring(0,5) == 'https') {
 148                     port = 443;
 149                 }
 150                 else if (window.location.protocol.substring(0,4) == 'http') {
 151                     port = 80;
 152                 }
 153             }
 154
 155             /* Populate the controls if defaults are provided in the URL */
 156             UI.initSetting('host', window.location.hostname);
 157             UI.initSetting('port', port);
 158             UI.initSetting('password', '');
 159             UI.initSetting('encrypt', (window.location.protocol === "https:"));
 160             UI.initSetting('true_color', true);
 161             UI.initSetting('cursor', !UI.isTouchDevice);
 162             UI.initSetting('resize', 'off');
 163             UI.initSetting('shared', true);
 164             UI.initSetting('view_only', false);
 165             UI.initSetting('path', 'websockify');
 166             UI.initSetting('repeaterID', '');
 167             UI.initSetting('token', '');
 168         },
 169
 170         setupWindowEvents: function() {
 171             window.addEventListener( 'resize', function () {
 172                 UI.applyResizeMode();
 173                 UI.updateViewClip();
 174                 UI.updateViewDrag();
 175             } );
 176
 177             document.getElementById("noVNC_status")
 178                 .addEventListener('click', UI.hideStatus);
 179         },
 180
 181         setupFullscreen: function() {
 182             // Only show the button if fullscreen is properly supported
 183             // * Safari doesn't support alphanumerical input while in fullscreen
 184             if (!UI.isSafari &&
 185                 (document.documentElement.requestFullscreen ||
 186                  document.documentElement.mozRequestFullScreen ||
 187                  document.documentElement.webkitRequestFullscreen ||
 188                  document.body.msRequestFullscreen)) {
 189                 document.getElementById('noVNC_fullscreen_button')
 190                     .classList.remove("noVNC_hidden");
 191                 UI.addFullscreenHandlers();
 192             }
 193         },
 194
 195         addControlbarHandlers: function() {
 196             document.getElementById("noVNC_control_bar")
 197                 .addEventListener('mousemove', UI.activateControlbar);
 198             document.getElementById("noVNC_control_bar")
 199                 .addEventListener('mouseup', UI.activateControlbar);
 200             document.getElementById("noVNC_control_bar")
 201                 .addEventListener('mousedown', UI.activateControlbar);
 202             document.getElementById("noVNC_control_bar")
 203                 .addEventListener('keypress', UI.activateControlbar);
 204
 205             document.getElementById("noVNC_view_drag_button")
 206                 .addEventListener('click', UI.toggleViewDrag);
 207             document.getElementById("noVNC_send_ctrl_alt_del_button")
 208                 .addEventListener('click', UI.sendCtrlAltDel);
 209
 210             document.getElementById("noVNC_control_bar_handle")
 211                 .addEventListener('mousedown', UI.controlbarHandleMouseDown);
 212             document.getElementById("noVNC_control_bar_handle")
 213                 .addEventListener('mouseup', UI.controlbarHandleMouseUp);
 214             document.getElementById("noVNC_control_bar_handle")
 215                 .addEventListener('mousemove', UI.dragControlbarHandle);
 216             // resize events aren't available for elements
 217             window.addEventListener('resize', UI.updateControlbarHandle);
 218         },
 219
 220         addTouchSpecificHandlers: function() {
 221             document.getElementById("noVNC_mouse_button0")
 222                 .addEventListener('click', function () { UI.setMouseButton(1); });
 223             document.getElementById("noVNC_mouse_button1")
 224                 .addEventListener('click', function () { UI.setMouseButton(2); });
 225             document.getElementById("noVNC_mouse_button2")
 226                 .addEventListener('click', function () { UI.setMouseButton(4); });
 227             document.getElementById("noVNC_mouse_button4")
 228                 .addEventListener('click', function () { UI.setMouseButton(0); });
 229             document.getElementById("noVNC_keyboard_button")
 230                 .addEventListener('click', UI.showKeyboard);
 231
 232             document.getElementById("noVNC_keyboardinput")
 233                 .addEventListener('input', UI.keyInput);
 234             document.getElementById("noVNC_keyboardinput")
 235                 .addEventListener('blur', UI.hideKeyboard);
 236             document.getElementById("noVNC_keyboardinput")
 237                 .addEventListener('submit', function () { return false; });
 238
 239             document.getElementById("noVNC_control_bar")
 240                 .addEventListener('touchstart', UI.activateControlbar);
 241             document.getElementById("noVNC_control_bar")
 242                 .addEventListener('touchmove', UI.activateControlbar);
 243             document.getElementById("noVNC_control_bar")
 244                 .addEventListener('touchend', UI.activateControlbar);
 245             document.getElementById("noVNC_control_bar")
 246                 .addEventListener('input', UI.activateControlbar);
 247
 248             document.getElementById("noVNC_control_bar_handle")
 249                 .addEventListener('touchstart', UI.controlbarHandleMouseDown);
 250             document.getElementById("noVNC_control_bar_handle")
 251                 .addEventListener('touchend', UI.controlbarHandleMouseUp);
 252             document.getElementById("noVNC_control_bar_handle")
 253                 .addEventListener('touchmove', UI.dragControlbarHandle);
 254
 255             window.addEventListener('load', UI.keyboardinputReset);
 256         },
 257
 258         addExtraKeysHandlers: function() {
 259             document.getElementById("noVNC_toggle_extra_keys_button")
 260                 .addEventListener('click', UI.toggleExtraKeys);
 261             document.getElementById("noVNC_toggle_ctrl_button")
 262                 .addEventListener('click', UI.toggleCtrl);
 263             document.getElementById("noVNC_toggle_alt_button")
 264                 .addEventListener('click', UI.toggleAlt);
 265             document.getElementById("noVNC_send_tab_button")
 266                 .addEventListener('click', UI.sendTab);
 267             document.getElementById("noVNC_send_esc_button")
 268                 .addEventListener('click', UI.sendEsc);
 269         },
 270
 271         addXvpHandlers: function() {
 272             document.getElementById("noVNC_xvp_shutdown_button")
 273                 .addEventListener('click', function() { UI.rfb.xvpShutdown(); });
 274             document.getElementById("noVNC_xvp_reboot_button")
 275                 .addEventListener('click', function() { UI.rfb.xvpReboot(); });
 276             document.getElementById("noVNC_xvp_reset_button")
 277                 .addEventListener('click', function() { UI.rfb.xvpReset(); });
 278             document.getElementById("noVNC_xvp_button")
 279                 .addEventListener('click', UI.toggleXvpPanel);
 280         },
 281
 282         addConnectionControlHandlers: function() {
 283             document.getElementById("noVNC_connect_controls_button")
 284                 .addEventListener('click', UI.toggleConnectPanel);
 285             document.getElementById("noVNC_disconnect_button")
 286                 .addEventListener('click', UI.disconnect);
 287             document.getElementById("noVNC_connect_button")
 288                 .addEventListener('click', UI.connect);
 289
 290             document.getElementById("noVNC_password_button")
 291                 .addEventListener('click', UI.setPassword);
 292         },
 293
 294         addClipboardHandlers: function() {
 295             document.getElementById("noVNC_clipboard_button")
 296                 .addEventListener('click', UI.toggleClipboardPanel);
 297             document.getElementById("noVNC_clipboard_text")
 298                 .addEventListener('focus', UI.displayBlur);
 299             document.getElementById("noVNC_clipboard_text")
 300                 .addEventListener('blur', UI.displayFocus);
 301             document.getElementById("noVNC_clipboard_text")
 302                 .addEventListener('change', UI.clipboardSend);
 303             document.getElementById("noVNC_clipboard_clear_button")
 304                 .addEventListener('click', UI.clipboardClear);
 305         },
 306
 307         addSettingsHandlers: function() {
 308             document.getElementById("noVNC_settings_button")
 309                 .addEventListener('click', UI.toggleSettingsPanel);
 310             document.getElementById("noVNC_settings_apply")
 311                 .addEventListener('click', UI.settingsApply);
 312
 313             document.getElementById("noVNC_setting_resize")
 314                 .addEventListener('change', UI.enableDisableViewClip);
 315         },
 316
 317         addFullscreenHandlers: function() {
 318             document.getElementById("noVNC_fullscreen_button")
 319                 .addEventListener('click', UI.toggleFullscreen);
 320
 321             window.addEventListener('fullscreenchange', UI.updateFullscreenButton);
 322             window.addEventListener('mozfullscreenchange', UI.updateFullscreenButton);
 323             window.addEventListener('webkitfullscreenchange', UI.updateFullscreenButton);
 324             window.addEventListener('msfullscreenchange', UI.updateFullscreenButton);
 325         },
 326
 327         initRFB: function() {
 328             try {
 329                 UI.rfb = new RFB({'target': document.getElementById('noVNC_canvas'),
 330                                   'onUpdateState': UI.updateState,
 331                                   'onXvpInit': UI.updateXvpButton,
 332                                   'onClipboard': UI.clipboardReceive,
 333                                   'onFBUComplete': UI.initialResize,
 334                                   'onFBResize': UI.updateViewDrag,
 335                                   'onDesktopName': UI.updateDocumentTitle});
 336                 return true;
 337             } catch (exc) {
 338                 UI.updateState(null, 'fatal', null, 'Unable to create RFB client -- ' + exc);
 339                 return false;
 340             }
 341         },
 342
 343 /* ------^-------
 344  *     /INIT
 345  * ==============
 346  *     VISUAL
 347  * ------v------*/
 348
 349         updateState: function(rfb, state, oldstate, msg) {
 350             UI.rfb_state = state;
 351
 352             if (typeof(msg) !== 'undefined') {
 353                 switch (state) {
 354                     case 'failed':
 355                     case 'fatal':
 356                         // zero means no timeout
 357                         UI.showStatus(msg, 'error', 0);
 358                         break;
 359                     case 'normal':
 360                         /* falls through */
 361                     case 'disconnected':
 362                     case 'loaded':
 363                         UI.showStatus(msg, 'normal');
 364                         break;
 365                     case 'password':
 366                         document.getElementById('noVNC_password_dlg')
 367                             .classList.add('noVNC_open');
 368                         setTimeout(function () {
 369                                 document.getElementById(('noVNC_password_input').focus());
 370                             }, 100);
 371
 372                         UI.showStatus(msg, 'warn');
 373                         break;
 374                     default:
 375                         UI.showStatus(msg, 'warn');
 376                         break;
 377                 }
 378             }
 379
 380             UI.updateVisualState();
 381         },
 382
 383         // Disable/enable controls depending on connection state
 384         updateVisualState: function() {
 385             var connected = UI.rfb && UI.rfb_state === 'normal';
 386
 387             //Util.Debug(">> updateVisualState");
 388             document.getElementById('noVNC_setting_encrypt').disabled = connected;
 389             document.getElementById('noVNC_setting_true_color').disabled = connected;
 390             if (Util.browserSupportsCursorURIs()) {
 391                 document.getElementById('noVNC_setting_cursor').disabled = connected;
 392             } else {
 393                 UI.updateSetting('cursor', !UI.isTouchDevice);
 394                 document.getElementById('noVNC_setting_cursor').disabled = true;
 395             }
 396
 397             UI.enableDisableViewClip();
 398             document.getElementById('noVNC_setting_resize').disabled = connected;
 399             document.getElementById('noVNC_setting_shared').disabled = connected;
 400             document.getElementById('noVNC_setting_view_only').disabled = connected;
 401             document.getElementById('noVNC_setting_path').disabled = connected;
 402             document.getElementById('noVNC_setting_repeaterID').disabled = connected;
 403
 404             if (connected) {
 405                 document.documentElement.classList.add("noVNC_connected");
 406                 UI.updateViewClip();
 407                 UI.setMouseButton(1);
 408             } else {
 409                 document.documentElement.classList.remove("noVNC_connected");
 410                 UI.updateXvpButton(0);
 411             }
 412
 413             // State change disables viewport dragging.
 414             // It is enabled (toggled) by direct click on the button
 415             UI.setViewDrag(false);
 416
 417             // State change also closes the password dialog
 418             document.getElementById('noVNC_password_dlg')
 419                 .classList.remove('noVNC_open');
 420
 421             switch (UI.rfb_state) {
 422                 case 'fatal':
 423                 case 'failed':
 424                 case 'disconnected':
 425                     UI.openConnectPanel();
 426                     break;
 427                 case 'loaded':
 428                     break;
 429                 default:
 430                     break;
 431             }
 432
 433             //Util.Debug("<< updateVisualState");
 434         },
 435
 436         showStatus: function(text, status_type, time) {
 437             var statusElem = document.getElementById('noVNC_status');
 438
 439             clearTimeout(UI.statusTimeout);
 440
 441             if (typeof status_type === 'undefined') {
 442                 status_type = 'normal';
 443             }
 444
 445             statusElem.classList.remove("noVNC_status_normal",
 446                                         "noVNC_status_warn",
 447                                         "noVNC_status_error");
 448
 449             switch (status_type) {
 450                 case 'warning':
 451                 case 'warn':
 452                     statusElem.classList.add("noVNC_status_warn");
 453                     break;
 454                 case 'error':
 455                     statusElem.classList.add("noVNC_status_error");
 456                     break;
 457                 case 'normal':
 458                 case 'info':
 459                 default:
 460                     statusElem.classList.add("noVNC_status_normal");
 461                     break;
 462             }
 463
 464             statusElem.innerHTML = text;
 465             statusElem.classList.add("noVNC_open");
 466
 467             // If no time was specified, show the status for 1.5 seconds
 468             if (typeof time === 'undefined') {
 469                 time = 1500;
 470             }
 471
 472             // A specified time of zero means no timeout
 473             if (time != 0) {
 474                 UI.statusTimeout = window.setTimeout(UI.hideStatus, time);
 475             }
 476         },
 477
 478         hideStatus: function() {
 479             clearTimeout(UI.statusTimeout);
 480             document.getElementById('noVNC_status').classList.remove("noVNC_open");
 481         },
 482
 483         activateControlbar: function() {
 484             clearTimeout(UI.controlbarTimeout);
 485             // We manipulate the anchor instead of the actual control
 486             // bar in order to avoid creating new a stacking group
 487             document.getElementById('noVNC_control_bar_anchor')
 488                 .classList.remove("noVNC_idle");
 489             UI.controlbarTimeout = window.setTimeout(UI.idleControlbar, 2000);
 490         },
 491
 492         idleControlbar: function() {
 493             document.getElementById('noVNC_control_bar_anchor')
 494                 .classList.add("noVNC_idle");
 495         },
 496
 497         openControlbar: function() {
 498             document.getElementById('noVNC_control_bar')
 499                 .classList.add("noVNC_open");
 500         },
 501
 502         closeControlbar: function() {
 503             UI.closeAllPanels();
 504             document.getElementById('noVNC_control_bar')
 505                 .classList.remove("noVNC_open");
 506         },
 507
 508         toggleControlbar: function() {
 509             if (document.getElementById('noVNC_control_bar')
 510                 .classList.contains("noVNC_open")) {
 511                 UI.closeControlbar();
 512             } else {
 513                 UI.openControlbar();
 514             }
 515         },
 516
 517         dragControlbarHandle: function (e) {
 518             if (!UI.controlbarGrabbed) return;
 519
 520             var ptr = Util.getPointerEvent(e);
 521
 522             if (!UI.controlbarDrag) {
 523                 // The goal is to trigger on a certain physical width, the
 524                 // devicePixelRatio brings us a bit closer but is not optimal.
 525                 var dragThreshold = 10 * (window.devicePixelRatio || 1);
 526                 var dragDistance = Math.abs(ptr.clientY - UI.controlbarMouseDownClientY);
 527
 528                 if (dragDistance < dragThreshold) return;
 529
 530                 UI.controlbarDrag = true;
 531             }
 532
 533             var eventY = ptr.clientY - UI.controlbarMouseDownOffsetY;
 534
 535             UI.moveControlbarHandle(eventY);
 536
 537             e.preventDefault();
 538             e.stopPropagation();
 539         },
 540
 541         // Move the handle but don't allow any position outside the bounds
 542         moveControlbarHandle: function (posY) {
 543             var handle = document.getElementById("noVNC_control_bar_handle");
 544             var handleHeight = Util.getPosition(handle).height;
 545             var controlbar = document.getElementById("noVNC_control_bar");
 546             var controlbarBounds = Util.getPosition(controlbar);
 547             var controlbarTop = controlbarBounds.y;
 548             var controlbarBottom = controlbarBounds.y + controlbarBounds.height;
 549             var margin = 10;
 550
 551             var viewportY = posY;
 552
 553             // Refuse coordinates outside the control bar
 554             if (viewportY < controlbarTop + margin) {
 555                 viewportY = controlbarTop + margin;
 556             } else if (viewportY > controlbarBottom - handleHeight - margin) {
 557                 viewportY = controlbarBottom - handleHeight - margin;
 558             }
 559
 560             // Corner case: control bar too small for stable position
 561             if (controlbarBounds.height < (handleHeight + margin * 2)) {
 562                 viewportY = controlbarTop + (controlbarBounds.height - handleHeight) / 2;
 563             }
 564
 565             var relativeY = viewportY - controlbarTop;
 566             handle.style.transform = "translateY(" + relativeY + "px)";
 567         },
 568
 569         updateControlbarHandle: function () {
 570             var handle = document.getElementById("noVNC_control_bar_handle");
 571             var pos = Util.getPosition(handle);
 572             UI.moveControlbarHandle(pos.y);
 573         },
 574
 575         controlbarHandleMouseUp: function(e) {
 576             if ((e.type == "mouseup") && (e.button != 0))
 577                 return;
 578
 579             // mouseup and mousedown on the same place toggles the controlbar
 580             if (UI.controlbarGrabbed && !UI.controlbarDrag) {
 581                 UI.toggleControlbar();
 582                 e.preventDefault();
 583                 e.stopPropagation();
 584             }
 585             UI.controlbarGrabbed = false;
 586         },
 587
 588         controlbarHandleMouseDown: function(e) {
 589             if ((e.type == "mousedown") && (e.button != 0))
 590                 return;
 591
 592             var ptr = Util.getPointerEvent(e);
 593
 594             var handle = document.getElementById("noVNC_control_bar_handle");
 595             var bounds = handle.getBoundingClientRect();
 596
 597             WebUtil.setCapture(handle);
 598             UI.controlbarGrabbed = true;
 599             UI.controlbarDrag = false;
 600
 601             UI.controlbarMouseDownClientY = ptr.clientY;
 602             UI.controlbarMouseDownOffsetY = ptr.clientY - bounds.top;
 603             e.preventDefault();
 604             e.stopPropagation();
 605         },
 606
 607 /* ------^-------
 608  *    /VISUAL
 609  * ==============
 610  *    SETTINGS
 611  * ------v------*/
 612
 613         // Initial page load read/initialization of settings
 614         initSetting: function(name, defVal) {
 615             // Check Query string followed by cookie
 616             var val = WebUtil.getConfigVar(name);
 617             if (val === null) {
 618                 val = WebUtil.readSetting(name, defVal);
 619             }
 620             UI.updateSetting(name, val);
 621             return val;
 622         },
 623
 624         // Update cookie and form control setting. If value is not set, then
 625         // updates from control to current cookie setting.
 626         updateSetting: function(name, value) {
 627
 628             // Save the cookie for this session
 629             if (typeof value !== 'undefined') {
 630                 WebUtil.writeSetting(name, value);
 631             }
 632
 633             // Update the settings control
 634             value = UI.getSetting(name);
 635
 636             var ctrl = document.getElementById('noVNC_setting_' + name);
 637             if (ctrl.type === 'checkbox') {
 638                 ctrl.checked = value;
 639
 640             } else if (typeof ctrl.options !== 'undefined') {
 641                 for (var i = 0; i < ctrl.options.length; i += 1) {
 642                     if (ctrl.options[i].value === value) {
 643                         ctrl.selectedIndex = i;
 644                         break;
 645                     }
 646                 }
 647             } else {
 648                 /*Weird IE9 error leads to 'null' appearring
 649                 in textboxes instead of ''.*/
 650                 if (value === null) {
 651                     value = "";
 652                 }
 653                 ctrl.value = value;
 654             }
 655         },
 656
 657         // Save control setting to cookie
 658         saveSetting: function(name) {
 659             var val, ctrl = document.getElementById('noVNC_setting_' + name);
 660             if (ctrl.type === 'checkbox') {
 661                 val = ctrl.checked;
 662             } else if (typeof ctrl.options !== 'undefined') {
 663                 val = ctrl.options[ctrl.selectedIndex].value;
 664             } else {
 665                 val = ctrl.value;
 666             }
 667             WebUtil.writeSetting(name, val);
 668             //Util.Debug("Setting saved '" + name + "=" + val + "'");
 669             return val;
 670         },
 671
 672         // Force a setting to be a certain value
 673         forceSetting: function(name, val) {
 674             UI.updateSetting(name, val);
 675             return val;
 676         },
 677
 678         // Read form control compatible setting from cookie
 679         getSetting: function(name) {
 680             var ctrl = document.getElementById('noVNC_setting_' + name);
 681             var val = WebUtil.readSetting(name);
 682             if (typeof val !== 'undefined' && val !== null && ctrl.type === 'checkbox') {
 683                 if (val.toString().toLowerCase() in {'0':1, 'no':1, 'false':1}) {
 684                     val = false;
 685                 } else {
 686                     val = true;
 687                 }
 688             }
 689             return val;
 690         },
 691
 692         // Save/apply settings when 'Apply' button is pressed
 693         settingsApply: function() {
 694             //Util.Debug(">> settingsApply");
 695             UI.saveSetting('encrypt');
 696             UI.saveSetting('true_color');
 697             if (Util.browserSupportsCursorURIs()) {
 698                 UI.saveSetting('cursor');
 699             }
 700
 701             UI.saveSetting('resize');
 702
 703             if (UI.getSetting('resize') === 'downscale' || UI.getSetting('resize') === 'scale') {
 704                 UI.forceSetting('clip', false);
 705             }
 706
 707             UI.saveSetting('clip');
 708             UI.saveSetting('shared');
 709             UI.saveSetting('view_only');
 710             UI.saveSetting('path');
 711             UI.saveSetting('repeaterID');
 712             UI.saveSetting('stylesheet');
 713             UI.saveSetting('logging');
 714
 715             // Settings with immediate (non-connected related) effect
 716             WebUtil.selectStylesheet(UI.getSetting('stylesheet'));
 717             WebUtil.init_logging(UI.getSetting('logging'));
 718             UI.updateViewClip();
 719             UI.updateViewDrag();
 720             //Util.Debug("<< settingsApply");
 721         },
 722
 723 /* ------^-------
 724  *   /SETTINGS
 725  * ==============
 726  *    PANELS
 727  * ------v------*/
 728
 729         closeAllPanels: function() {
 730             UI.closeSettingsPanel();
 731             UI.closeXvpPanel();
 732             UI.closeClipboardPanel();
 733             UI.closeConnectPanel();
 734             UI.closeExtraKeys();
 735         },
 736
 737 /* ------^-------
 738  *   /PANELS
 739  * ==============
 740  * SETTINGS (panel)
 741  * ------v------*/
 742
 743         openSettingsPanel: function() {
 744             UI.closeAllPanels();
 745             UI.openControlbar();
 746
 747             UI.updateSetting('encrypt');
 748             UI.updateSetting('true_color');
 749             if (Util.browserSupportsCursorURIs()) {
 750                 UI.updateSetting('cursor');
 751             } else {
 752                 UI.updateSetting('cursor', !UI.isTouchDevice);
 753                 document.getElementById('noVNC_setting_cursor').disabled = true;
 754             }
 755             UI.updateSetting('clip');
 756             UI.updateSetting('resize');
 757             UI.updateSetting('shared');
 758             UI.updateSetting('view_only');
 759             UI.updateSetting('path');
 760             UI.updateSetting('repeaterID');
 761             UI.updateSetting('stylesheet');
 762             UI.updateSetting('logging');
 763
 764             document.getElementById('noVNC_settings')
 765                 .classList.add("noVNC_open");
 766             document.getElementById('noVNC_settings_button')
 767                 .classList.add("noVNC_selected");
 768         },
 769
 770         closeSettingsPanel: function() {
 771             document.getElementById('noVNC_settings')
 772                 .classList.remove("noVNC_open");
 773             document.getElementById('noVNC_settings_button')
 774                 .classList.remove("noVNC_selected");
 775         },
 776
 777         // Toggle the settings menu:
 778         //   On open, settings are refreshed from saved cookies.
 779         //   On close, settings are applied
 780         toggleSettingsPanel: function() {
 781             if (document.getElementById('noVNC_settings')
 782                 .classList.contains("noVNC_open")) {
 783                 UI.settingsApply();
 784                 UI.closeSettingsPanel();
 785             } else {
 786                 UI.openSettingsPanel();
 787             }
 788         },
 789
 790 /* ------^-------
 791  *   /SETTINGS
 792  * ==============
 793  *      XVP
 794  * ------v------*/
 795
 796         openXvpPanel: function() {
 797             UI.closeAllPanels();
 798             UI.openControlbar();
 799
 800             document.getElementById('noVNC_xvp')
 801                 .classList.add("noVNC_open");
 802             document.getElementById('noVNC_xvp_button')
 803                 .classList.add("noVNC_selected");
 804         },
 805
 806         closeXvpPanel: function() {
 807             document.getElementById('noVNC_xvp')
 808                 .classList.remove("noVNC_open");
 809             document.getElementById('noVNC_xvp_button')
 810                 .classList.remove("noVNC_selected");
 811         },
 812
 813         toggleXvpPanel: function() {
 814             if (document.getElementById('noVNC_xvp')
 815                 .classList.contains("noVNC_open")) {
 816                 UI.closeXvpPanel();
 817             } else {
 818                 UI.openXvpPanel();
 819             }
 820         },
 821
 822         // Disable/enable XVP button
 823         updateXvpButton: function(ver) {
 824             if (ver >= 1) {
 825                 document.getElementById('noVNC_xvp_button')
 826                     .classList.remove("noVNC_hidden");
 827             } else {
 828                 document.getElementById('noVNC_xvp_button')
 829                     .classList.add("noVNC_hidden");
 830                 // Close XVP panel if open
 831                 UI.closeXvpPanel();
 832             }
 833         },
 834
 835 /* ------^-------
 836  *     /XVP
 837  * ==============
 838  *   CLIPBOARD
 839  * ------v------*/
 840
 841         openClipboardPanel: function() {
 842             UI.closeAllPanels();
 843             UI.openControlbar();
 844
 845             document.getElementById('noVNC_clipboard')
 846                 .classList.add("noVNC_open");
 847             document.getElementById('noVNC_clipboard_button')
 848                 .classList.add("noVNC_selected");
 849         },
 850
 851         closeClipboardPanel: function() {
 852             document.getElementById('noVNC_clipboard')
 853                 .classList.remove("noVNC_open");
 854             document.getElementById('noVNC_clipboard_button')
 855                 .classList.remove("noVNC_selected");
 856         },
 857
 858         toggleClipboardPanel: function() {
 859             if (document.getElementById('noVNC_clipboard')
 860                 .classList.contains("noVNC_open")) {
 861                 UI.closeClipboardPanel();
 862             } else {
 863                 UI.openClipboardPanel();
 864             }
 865         },
 866
 867         clipboardReceive: function(rfb, text) {
 868             Util.Debug(">> UI.clipboardReceive: " + text.substr(0,40) + "...");
 869             document.getElementById('noVNC_clipboard_text').value = text;
 870             Util.Debug("<< UI.clipboardReceive");
 871         },
 872
 873         clipboardClear: function() {
 874             document.getElementById('noVNC_clipboard_text').value = "";
 875             UI.rfb.clipboardPasteFrom("");
 876         },
 877
 878         clipboardSend: function() {
 879             var text = document.getElementById('noVNC_clipboard_text').value;
 880             Util.Debug(">> UI.clipboardSend: " + text.substr(0,40) + "...");
 881             UI.rfb.clipboardPasteFrom(text);
 882             Util.Debug("<< UI.clipboardSend");
 883         },
 884
 885 /* ------^-------
 886  *  /CLIPBOARD
 887  * ==============
 888  *  CONNECTION
 889  * ------v------*/
 890
 891         openConnectPanel: function() {
 892             UI.closeAllPanels();
 893             UI.openControlbar();
 894
 895             document.getElementById('noVNC_connect_controls')
 896                 .classList.add("noVNC_open");
 897             document.getElementById('noVNC_connect_controls_button')
 898                 .classList.add("noVNC_selected");
 899
 900             document.getElementById('noVNC_setting_host').focus();
 901         },
 902
 903         closeConnectPanel: function() {
 904             document.getElementById('noVNC_connect_controls')
 905                 .classList.remove("noVNC_open");
 906             document.getElementById('noVNC_connect_controls_button')
 907                 .classList.remove("noVNC_selected");
 908
 909             UI.saveSetting('host');
 910             UI.saveSetting('port');
 911             UI.saveSetting('token');
 912             //UI.saveSetting('password');
 913         },
 914
 915         toggleConnectPanel: function() {
 916             if (document.getElementById('noVNC_connect_controls')
 917                 .classList.contains("noVNC_open")) {
 918                 UI.closeConnectPanel();
 919             } else {
 920                 UI.openConnectPanel();
 921             }
 922         },
 923
 924         connect: function() {
 925             UI.closeAllPanels();
 926             UI.closeControlbar();
 927
 928             var host = document.getElementById('noVNC_setting_host').value;
 929             var port = document.getElementById('noVNC_setting_port').value;
 930             var password = document.getElementById('noVNC_setting_password').value;
 931             var token = document.getElementById('noVNC_setting_token').value;
 932             var path = document.getElementById('noVNC_setting_path').value;
 933
 934             //if token is in path then ignore the new token variable
 935             if (token) {
 936                 path = WebUtil.injectParamIfMissing(path, "token", token);
 937             }
 938
 939             if ((!host) || (!port)) {
 940                 throw new Error("Must set host and port");
 941             }
 942
 943             if (!UI.initRFB()) return;
 944
 945             UI.rfb.set_encrypt(UI.getSetting('encrypt'));
 946             UI.rfb.set_true_color(UI.getSetting('true_color'));
 947             UI.rfb.set_local_cursor(UI.getSetting('cursor'));
 948             UI.rfb.set_shared(UI.getSetting('shared'));
 949             UI.rfb.set_view_only(UI.getSetting('view_only'));
 950             UI.rfb.set_repeaterID(UI.getSetting('repeaterID'));
 951
 952             UI.rfb.connect(host, port, password, path);
 953         },
 954
 955         disconnect: function() {
 956             UI.closeAllPanels();
 957             UI.rfb.disconnect();
 958
 959             // Restore the callback used for initial resize
 960             UI.rfb.set_onFBUComplete(UI.initialResize);
 961
 962             // Don't display the connection settings until we're actually disconnected
 963         },
 964
 965         setPassword: function() {
 966             UI.rfb.sendPassword(document.getElementById('noVNC_password_input').value);
 967             document.getElementById('noVNC_password_dlg')
 968                 .classList.remove('noVNC_open');
 969             return false;
 970         },
 971
 972 /* ------^-------
 973  *  /CONNECTION
 974  * ==============
 975  *   FULLSCREEN
 976  * ------v------*/
 977
 978         toggleFullscreen: function() {
 979             if (document.fullscreenElement || // alternative standard method
 980                 document.mozFullScreenElement || // currently working methods
 981                 document.webkitFullscreenElement ||
 982                 document.msFullscreenElement) {
 983                 if (document.exitFullscreen) {
 984                     document.exitFullscreen();
 985                 } else if (document.mozCancelFullScreen) {
 986                     document.mozCancelFullScreen();
 987                 } else if (document.webkitExitFullscreen) {
 988                     document.webkitExitFullscreen();
 989                 } else if (document.msExitFullscreen) {
 990                     document.msExitFullscreen();
 991                 }
 992             } else {
 993                 if (document.documentElement.requestFullscreen) {
 994                     document.documentElement.requestFullscreen();
 995                 } else if (document.documentElement.mozRequestFullScreen) {
 996                     document.documentElement.mozRequestFullScreen();
 997                 } else if (document.documentElement.webkitRequestFullscreen) {
 998                     document.documentElement.webkitRequestFullscreen(Element.ALLOW_KEYBOARD_INPUT);
 999                 } else if (document.body.msRequestFullscreen) {
1000                     document.body.msRequestFullscreen();
1001                 }
1002             }
1003             UI.enableDisableViewClip();
1004             UI.updateFullscreenButton();
1005         },
1006
1007         updateFullscreenButton: function() {
1008             if (document.fullscreenElement || // alternative standard method
1009                 document.mozFullScreenElement || // currently working methods
1010                 document.webkitFullscreenElement ||
1011                 document.msFullscreenElement ) {
1012                 document.getElementById('noVNC_fullscreen_button')
1013                     .classList.add("noVNC_selected");
1014             } else {
1015                 document.getElementById('noVNC_fullscreen_button')
1016                     .classList.remove("noVNC_selected");
1017             }
1018         },
1019
1020 /* ------^-------
1021  *  /FULLSCREEN
1022  * ==============
1023  *     RESIZE
1024  * ------v------*/
1025
1026         // Apply remote resizing or local scaling
1027         applyResizeMode: function() {
1028             if (!UI.rfb) return;
1029
1030             var screen = UI.screenSize();
1031
1032             if (screen && UI.rfb_state === 'normal' && UI.rfb.get_display()) {
1033
1034                 var display = UI.rfb.get_display();
1035                 var resizeMode = UI.getSetting('resize');
1036
1037                 if (resizeMode === 'remote') {
1038
1039                     // Request changing the resolution of the remote display to
1040                     // the size of the local browser viewport.
1041
1042                     // In order to not send multiple requests before the browser-resize
1043                     // is finished we wait 0.5 seconds before sending the request.
1044                     clearTimeout(UI.resizeTimeout);
1045                     UI.resizeTimeout = setTimeout(function(){
1046
1047                         // Limit the viewport to the size of the browser window
1048                         display.set_maxWidth(screen.w);
1049                         display.set_maxHeight(screen.h);
1050
1051                         Util.Debug('Attempting requestDesktopSize(' +
1052                                    screen.w + ', ' + screen.h + ')');
1053
1054                         // Request a remote size covering the viewport
1055                         UI.rfb.requestDesktopSize(screen.w, screen.h);
1056                     }, 500);
1057
1058                 } else if (resizeMode === 'scale' || resizeMode === 'downscale') {
1059                     var downscaleOnly = resizeMode === 'downscale';
1060                     var scaleRatio = display.autoscale(screen.w, screen.h, downscaleOnly);
1061                     UI.rfb.get_mouse().set_scale(scaleRatio);
1062                     Util.Debug('Scaling by ' + UI.rfb.get_mouse().get_scale());
1063                 }
1064             }
1065         },
1066
1067         // The screen is always the same size as the available viewport
1068         // in the browser window minus the height of the control bar
1069         screenSize: function() {
1070             var screen = document.getElementById('noVNC_screen');
1071
1072             // Hide the scrollbars until the size is calculated
1073             screen.style.overflow = "hidden";
1074
1075             var pos = Util.getPosition(screen);
1076             var w = pos.width;
1077             var h = pos.height;
1078
1079             screen.style.overflow = "visible";
1080
1081             if (isNaN(w) || isNaN(h)) {
1082                 return false;
1083             } else {
1084                 return {w: w, h: h};
1085             }
1086         },
1087
1088         // Normally we only apply the current resize mode after a window resize
1089         // event. This means that when a new connection is opened, there is no
1090         // resize mode active.
1091         // We have to wait until the first FBU because this is where the client
1092         // will find the supported encodings of the server. Some calls later in
1093         // the chain is dependant on knowing the server-capabilities.
1094         initialResize: function(rfb, fbu) {
1095             UI.applyResizeMode();
1096             // After doing this once, we remove the callback.
1097             UI.rfb.set_onFBUComplete(function() { });
1098         },
1099
1100 /* ------^-------
1101  *    /RESIZE
1102  * ==============
1103  *    CLIPPING
1104  * ------v------*/
1105
1106         // Set and configure viewport clipping
1107         setViewClip: function(clip) {
1108             UI.updateSetting('clip', clip);
1109             UI.updateViewClip();
1110         },
1111
1112         // Update parameters that depend on the clip setting
1113         updateViewClip: function() {
1114             var display;
1115             if (!UI.rfb) {
1116                 return;
1117             }
1118
1119             var display = UI.rfb.get_display();
1120             var cur_clip = display.get_viewport();
1121             var new_clip = UI.getSetting('clip');
1122
1123             if (cur_clip !== new_clip) {
1124                 display.set_viewport(new_clip);
1125             }
1126
1127             var size = UI.screenSize();
1128
1129             if (new_clip && size) {
1130                 // When clipping is enabled, the screen is limited to
1131                 // the size of the browser window.
1132                 display.set_maxWidth(size.w);
1133                 display.set_maxHeight(size.h);
1134
1135                 var screen = document.getElementById('noVNC_screen');
1136                 var canvas = document.getElementById('noVNC_canvas');
1137
1138                 // Hide potential scrollbars that can skew the position
1139                 screen.style.overflow = "hidden";
1140
1141                 // The x position marks the left margin of the canvas,
1142                 // remove the margin from both sides to keep it centered.
1143                 var new_w = size.w - (2 * Util.getPosition(canvas).x);
1144
1145                 screen.style.overflow = "visible";
1146
1147                 display.viewportChangeSize(new_w, size.h);
1148             } else {
1149                 // Disable max dimensions
1150                 display.set_maxWidth(0);
1151                 display.set_maxHeight(0);
1152                 display.viewportChangeSize();
1153             }
1154         },
1155
1156         // Handle special cases where clipping is forced on/off or locked
1157         enableDisableViewClip: function() {
1158             var resizeSetting = document.getElementById('noVNC_setting_resize');
1159             var connected = UI.rfb && UI.rfb_state === 'normal';
1160
1161             if (UI.isSafari) {
1162                 // Safari auto-hides the scrollbars which makes them
1163                 // impossible to use in most cases
1164                 UI.setViewClip(true);
1165                 document.getElementById('noVNC_setting_clip').disabled = true;
1166             } else if (resizeSetting.value === 'downscale' || resizeSetting.value === 'scale') {
1167                 // Disable clipping if we are scaling
1168                 UI.setViewClip(false);
1169                 document.getElementById('noVNC_setting_clip').disabled = true;
1170             } else if (document.msFullscreenElement) {
1171                 // The browser is IE and we are in fullscreen mode.
1172                 // - We need to force clipping while in fullscreen since
1173                 //   scrollbars doesn't work.
1174                 UI.showStatus("Forcing clipping mode since scrollbars aren't supported by IE in fullscreen");
1175                 UI.rememberedClipSetting = UI.getSetting('clip');
1176                 UI.setViewClip(true);
1177                 document.getElementById('noVNC_setting_clip').disabled = true;
1178             } else if (document.body.msRequestFullscreen && UI.rememberedClip !== null) {
1179                 // Restore view clip to what it was before fullscreen on IE
1180                 UI.setViewClip(UI.rememberedClipSetting);
1181                 document.getElementById('noVNC_setting_clip').disabled = connected || UI.isTouchDevice;
1182             } else {
1183                 document.getElementById('noVNC_setting_clip').disabled = connected || UI.isTouchDevice;
1184                 if (UI.isTouchDevice) {
1185                     UI.setViewClip(true);
1186                 }
1187             }
1188         },
1189
1190 /* ------^-------
1191  *   /CLIPPING
1192  * ==============
1193  *    VIEWDRAG
1194  * ------v------*/
1195
1196         toggleViewDrag: function() {
1197             if (!UI.rfb) return;
1198
1199             var drag = UI.rfb.get_viewportDrag();
1200             UI.setViewDrag(!drag);
1201          },
1202
1203         // Set the view drag mode which moves the viewport on mouse drags
1204         setViewDrag: function(drag) {
1205             if (!UI.rfb) return;
1206
1207             UI.rfb.set_viewportDrag(drag);
1208
1209             UI.updateViewDrag();
1210         },
1211
1212         updateViewDrag: function() {
1213             var clipping = false;
1214
1215             if (UI.rfb_state !== 'normal') return;
1216
1217             // Check if viewport drag is possible. It is only possible
1218             // if the remote display is clipping the client display.
1219             if (UI.rfb.get_display().get_viewport() &&
1220                 UI.rfb.get_display().clippingDisplay()) {
1221                 clipping = true;
1222             }
1223
1224             var viewDragButton = document.getElementById('noVNC_view_drag_button');
1225
1226             if (!clipping &&
1227                 UI.rfb.get_viewportDrag()) {
1228                 // The size of the remote display is the same or smaller
1229                 // than the client display. Make sure viewport drag isn't
1230                 // active when it can't be used.
1231                 UI.rfb.set_viewportDrag(false);
1232             }
1233
1234             if (UI.rfb.get_viewportDrag()) {
1235                 viewDragButton.classList.add("noVNC_selected");
1236             } else {
1237                 viewDragButton.classList.remove("noVNC_selected");
1238             }
1239
1240             // Different behaviour for touch vs non-touch
1241             // The button is disabled instead of hidden on touch devices
1242             if (UI.isTouchDevice) {
1243                 viewDragButton.classList.remove("noVNC_hidden");
1244
1245                 if (clipping) {
1246                     viewDragButton.disabled = false;
1247                 } else {
1248                     viewDragButton.disabled = true;
1249                 }
1250             } else {
1251                 viewDragButton.disabled = false;
1252
1253                 if (clipping) {
1254                     viewDragButton.classList.remove("noVNC_hidden");
1255                 } else {
1256                     viewDragButton.classList.add("noVNC_hidden");
1257                 }
1258             }
1259         },
1260
1261 /* ------^-------
1262  *   /VIEWDRAG
1263  * ==============
1264  *    KEYBOARD
1265  * ------v------*/
1266
1267         // On touch devices, show the OS keyboard
1268         showKeyboard: function() {
1269             var kbi = document.getElementById('noVNC_keyboardinput');
1270             var skb = document.getElementById('noVNC_keyboard_button');
1271             var l = kbi.value.length;
1272             if(UI.keyboardVisible === false) {
1273                 kbi.focus();
1274                 try { kbi.setSelectionRange(l, l); } // Move the caret to the end
1275                 catch (err) {} // setSelectionRange is undefined in Google Chrome
1276                 UI.keyboardVisible = true;
1277                 skb.classList.add("noVNC_selected");
1278             } else if(UI.keyboardVisible === true) {
1279                 kbi.blur();
1280                 skb.classList.remove("noVNC_selected");
1281                 UI.keyboardVisible = false;
1282             }
1283         },
1284
1285         hideKeyboard: function() {
1286             document.getElementById('noVNC_keyboard_button')
1287                 .classList.remove("noVNC_selected");
1288             //Weird bug in iOS if you change keyboardVisible
1289             //here it does not actually occur so next time
1290             //you click keyboard icon it doesnt work.
1291             UI.hideKeyboardTimeout = setTimeout(function() {
1292                 UI.keyboardVisible = false;
1293             },100);
1294         },
1295
1296         keepKeyboard: function() {
1297             clearTimeout(UI.hideKeyboardTimeout);
1298             if(UI.keyboardVisible === true) {
1299                 document.getElementById('noVNC_keyboardinput').focus();
1300                 document.getElementById('noVNC_keyboard_button')
1301                     .classList.add("noVNC_selected");
1302             } else if(UI.keyboardVisible === false) {
1303                 document.getElementById('noVNC_keyboardinput').blur();
1304                 document.getElementById('noVNC_keyboard_button')
1305                     .classList.remove("noVNC_selected");
1306             }
1307         },
1308
1309         keyboardinputReset: function() {
1310             var kbi = document.getElementById('noVNC_keyboardinput');
1311             kbi.value = new Array(UI.defaultKeyboardinputLen).join("_");
1312             UI.lastKeyboardinput = kbi.value;
1313         },
1314
1315         // When normal keyboard events are left uncought, use the input events from
1316         // the keyboardinput element instead and generate the corresponding key events.
1317         // This code is required since some browsers on Android are inconsistent in
1318         // sending keyCodes in the normal keyboard events when using on screen keyboards.
1319         keyInput: function(event) {
1320
1321             if (!UI.rfb) return;
1322
1323             var newValue = event.target.value;
1324
1325             if (!UI.lastKeyboardinput) {
1326                 UI.keyboardinputReset();
1327             }
1328             var oldValue = UI.lastKeyboardinput;
1329
1330             var newLen;
1331             try {
1332                 // Try to check caret position since whitespace at the end
1333                 // will not be considered by value.length in some browsers
1334                 newLen = Math.max(event.target.selectionStart, newValue.length);
1335             } catch (err) {
1336                 // selectionStart is undefined in Google Chrome
1337                 newLen = newValue.length;
1338             }
1339             var oldLen = oldValue.length;
1340
1341             var backspaces;
1342             var inputs = newLen - oldLen;
1343             if (inputs < 0) {
1344                 backspaces = -inputs;
1345             } else {
1346                 backspaces = 0;
1347             }
1348
1349             // Compare the old string with the new to account for
1350             // text-corrections or other input that modify existing text
1351             var i;
1352             for (i = 0; i < Math.min(oldLen, newLen); i++) {
1353                 if (newValue.charAt(i) != oldValue.charAt(i)) {
1354                     inputs = newLen - i;
1355                     backspaces = oldLen - i;
1356                     break;
1357                 }
1358             }
1359
1360             // Send the key events
1361             for (i = 0; i < backspaces; i++) {
1362                 UI.rfb.sendKey(KeyTable.XK_BackSpace);
1363             }
1364             for (i = newLen - inputs; i < newLen; i++) {
1365                 UI.rfb.sendKey(newValue.charCodeAt(i));
1366             }
1367
1368             // Control the text content length in the keyboardinput element
1369             if (newLen > 2 * UI.defaultKeyboardinputLen) {
1370                 UI.keyboardinputReset();
1371             } else if (newLen < 1) {
1372                 // There always have to be some text in the keyboardinput
1373                 // element with which backspace can interact.
1374                 UI.keyboardinputReset();
1375                 // This sometimes causes the keyboard to disappear for a second
1376                 // but it is required for the android keyboard to recognize that
1377                 // text has been added to the field
1378                 event.target.blur();
1379                 // This has to be ran outside of the input handler in order to work
1380                 setTimeout(UI.keepKeyboard, 0);
1381             } else {
1382                 UI.lastKeyboardinput = newValue;
1383             }
1384         },
1385
1386         openExtraKeys: function() {
1387             UI.closeAllPanels();
1388             UI.openControlbar();
1389
1390             document.getElementById('noVNC_modifiers')
1391                 .classList.add("noVNC_open");
1392             document.getElementById('noVNC_toggle_extra_keys_button')
1393                 .classList.add("noVNC_selected");
1394         },
1395
1396         closeExtraKeys: function() {
1397             document.getElementById('noVNC_modifiers')
1398                 .classList.remove("noVNC_open");
1399             document.getElementById('noVNC_toggle_extra_keys_button')
1400                 .classList.remove("noVNC_selected");
1401         },
1402
1403         toggleExtraKeys: function() {
1404             UI.keepKeyboard();
1405             if(document.getElementById('noVNC_modifiers')
1406                 .classList.contains("noVNC_open")) {
1407                 UI.closeExtraKeys();
1408             } else  {
1409                 UI.openExtraKeys();
1410             }
1411         },
1412
1413         sendEsc: function() {
1414             UI.keepKeyboard();
1415             UI.rfb.sendKey(KeyTable.XK_Escape);
1416         },
1417
1418         sendTab: function() {
1419             UI.keepKeyboard();
1420             UI.rfb.sendKey(KeyTable.XK_Tab);
1421         },
1422
1423         toggleCtrl: function() {
1424             UI.keepKeyboard();
1425             var btn = document.getElementById('noVNC_toggle_ctrl_button');
1426             if (btn.classList.contains("noVNC_selected")) {
1427                 UI.rfb.sendKey(KeyTable.XK_Control_L, false);
1428                 btn.classList.remove("noVNC_selected");
1429             } else {
1430                 UI.rfb.sendKey(KeyTable.XK_Control_L, true);
1431                 btn.classList.add("noVNC_selected");
1432             }
1433         },
1434
1435         toggleAlt: function() {
1436             UI.keepKeyboard();
1437             var btn = document.getElementById('noVNC_toggle_alt_button');
1438             if (btn.classList.contains("noVNC_selected")) {
1439                 UI.rfb.sendKey(KeyTable.XK_Alt_L, false);
1440                 btn.classList.remove("noVNC_selected");
1441             } else {
1442                 UI.rfb.sendKey(KeyTable.XK_Alt_L, true);
1443                 btn.classList.add("noVNC_selected");
1444             }
1445         },
1446
1447         sendCtrlAltDel: function() {
1448             UI.rfb.sendCtrlAltDel();
1449         },
1450
1451 /* ------^-------
1452  *   /KEYBOARD
1453  * ==============
1454  *     MISC
1455  * ------v------*/
1456
1457         setMouseButton: function(num) {
1458             if (UI.rfb) {
1459                 UI.rfb.get_mouse().set_touchButton(num);
1460             }
1461
1462             var blist = [0, 1,2,4];
1463             for (var b = 0; b < blist.length; b++) {
1464                 var button = document.getElementById('noVNC_mouse_button' + blist[b]);
1465                 if (blist[b] === num) {
1466                     button.classList.remove("noVNC_hidden");
1467                 } else {
1468                     button.classList.add("noVNC_hidden");
1469                 }
1470             }
1471         },
1472
1473         displayBlur: function() {
1474             if (!UI.rfb) return;
1475
1476             UI.rfb.get_keyboard().set_focused(false);
1477             UI.rfb.get_mouse().set_focused(false);
1478         },
1479
1480         displayFocus: function() {
1481             if (!UI.rfb) return;
1482
1483             UI.rfb.get_keyboard().set_focused(true);
1484             UI.rfb.get_mouse().set_focused(true);
1485         },
1486
1487         // Display the desktop name in the document title
1488         updateDocumentTitle: function(rfb, name) {
1489             document.title = name + " - noVNC";
1490         },
1491
1492         //Helper to add options to dropdown.
1493         addOption: function(selectbox, text, value) {
1494             var optn = document.createElement("OPTION");
1495             optn.text = text;
1496             optn.value = value;
1497             selectbox.options.add(optn);
1498         },
1499
1500 /* ------^-------
1501  *    /MISC
1502  * ==============
1503  */
1504     };
1505
1506     /* [module] UI.load(); */
1507 })();
1508
1509 /* [module] export default UI; */