mod/scorm/module.js

   1 // This file is part of Moodle - http://moodle.org/
   2 //
   3 // Moodle is free software: you can redistribute it and/or modify
   4 // it under the terms of the GNU General Public License as published by
   5 // the Free Software Foundation, either version 3 of the License, or
   6 // (at your option) any later version.
   7 //
   8 // Moodle is distributed in the hope that it will be useful,
   9 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11 // GNU General Public License for more details.
  12 //
  13 // You should have received a copy of the GNU General Public License
  14 // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
  15
  16 /**
  17  * Javascript helper function for SCORM module.
  18  *
  19  * @package   mod-scorm
  20  * @copyright 2009 Petr Skoda (http://skodak.org)
  21  * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  22  */
  23
  24 mod_scorm_launch_next_sco = null;
  25 mod_scorm_launch_prev_sco = null;
  26 mod_scorm_activate_item = null;
  27 mod_scorm_parse_toc_tree = null;
  28 scorm_layout_widget = null;
  29
  30 window.scorm_current_node = null;
  31
  32 function underscore(str) {
  33     str = String(str).replace(/.N/g,".");
  34     return str.replace(/\./g,"__");
  35 }
  36
  37 M.mod_scorm = {};
  38
  39 M.mod_scorm.init = function(Y, nav_display, navposition_left, navposition_top, hide_toc, collapsetocwinsize, toc_title, window_name, launch_sco, scoes_nav) {
  40     var scorm_disable_toc = false;
  41     var scorm_hide_nav = true;
  42     var scorm_hide_toc = true;
  43     if (hide_toc == 0) {
  44         if (nav_display !== 0) {
  45             scorm_hide_nav = false;
  46         }
  47         scorm_hide_toc = false;
  48     } else if (hide_toc == 3) {
  49         scorm_disable_toc = true;
  50     }
  51
  52     scoes_nav = Y.JSON.parse(scoes_nav);
  53     var scorm_buttons = [];
  54     var scorm_bloody_labelclick = false;
  55     var scorm_nav_panel;
  56
  57     Y.use('button', 'dd-plugin', 'panel', 'resize', 'gallery-sm-treeview', function(Y) {
  58
  59         Y.TreeView.prototype.getNodeByAttribute = function(attribute, value) {
  60             var node = null,
  61                 domnode = Y.one('a[' + attribute + '="' + value + '"]');
  62             if (domnode !== null) {
  63                 node = scorm_tree_node.getNodeById(domnode.ancestor('li').get('id'));
  64             }
  65             return node;
  66         };
  67
  68         Y.TreeView.prototype.openAll = function () {
  69             this.get('container').all('.yui3-treeview-can-have-children').each(function(target) {
  70                 this.getNodeById(target.get('id')).open();
  71             }, this);
  72         };
  73
  74         Y.TreeView.prototype.closeAll = function () {
  75             this.get('container').all('.yui3-treeview-can-have-children').each(function(target) {
  76                 this.getNodeById(target.get('id')).close();
  77             }, this);
  78         }
  79
  80         var scorm_parse_toc_tree = function(srcNode) {
  81             var SELECTORS = {
  82                     child: '> li',
  83                     label: '> li, > a',
  84                     textlabel : '> li, > span',
  85                     subtree: '> ul, > li'
  86                 },
  87                 children = [];
  88
  89             srcNode.all(SELECTORS.child).each(function(childNode) {
  90                 var child = {},
  91                     labelNode = childNode.one(SELECTORS.label),
  92                     textNode = childNode.one(SELECTORS.textlabel),
  93                     subTreeNode = childNode.one(SELECTORS.subtree);
  94
  95                 if (labelNode) {
  96                     var title = labelNode.getAttribute('title');
  97                     var scoid = labelNode.getData('scoid');
  98                     child.label = labelNode.get('outerHTML');
  99                     // Will be good to change to url instead of title.
 100                     if (title && title !== '#') {
 101                         child.title = title;
 102                     }
 103                     if (typeof scoid !== 'undefined') {
 104                         child.scoid = scoid;
 105                     }
 106                 } else if (textNode) {
 107                     // The selector did not find a label node with anchor.
 108                     child.label = textNode.get('outerHTML');
 109                 }
 110
 111                 if (subTreeNode) {
 112                     child.children = scorm_parse_toc_tree(subTreeNode);
 113                 }
 114
 115                 children.push(child);
 116             });
 117
 118             return children;
 119         };
 120
 121         mod_scorm_parse_toc_tree = scorm_parse_toc_tree;
 122
 123         var scorm_activate_item = function(node) {
 124             if (!node) {
 125                 return;
 126             }
 127             // Check if the item is already active, avoid recursive calls.
 128             var content = Y.one('#scorm_content');
 129             var old = Y.one('#scorm_object');
 130             if (old) {
 131                 var scorm_active_url = Y.one('#scorm_object').getAttribute('src');
 132                 var node_full_url = M.cfg.wwwroot + '/mod/scorm/loadSCO.php?' + node.title;
 133                 if (node_full_url === scorm_active_url) {
 134                     return;
 135                 }
 136                 // Start to unload iframe here
 137                 if(!window_name){
 138                     content.removeChild(old);
 139                     old = null;
 140                 }
 141             }
 142             // End of - Avoid recursive calls.
 143
 144             scorm_current_node = node;
 145             if (!scorm_current_node.state.selected) {
 146                 scorm_current_node.select();
 147             }
 148
 149             scorm_tree_node.closeAll();
 150             var url_prefix = M.cfg.wwwroot + '/mod/scorm/loadSCO.php?';
 151             var el_old_api = document.getElementById('scormapi123');
 152             if (el_old_api) {
 153                 el_old_api.parentNode.removeChild(el_old_api);
 154             }
 155
 156             var obj = document.createElement('iframe');
 157             obj.setAttribute('id', 'scorm_object');
 158             obj.setAttribute('type', 'text/html');
 159             if (!window_name && node.title != null) {
 160                 obj.setAttribute('src', url_prefix + node.title);
 161             }
 162             if (window_name) {
 163                 var mine = window.open('','','width=1,height=1,left=0,top=0,scrollbars=no');
 164                 if(! mine) {
 165                     alert(M.util.get_string('popupsblocked', 'scorm'));
 166                 }
 167                 mine.close();
 168             }
 169
 170             if (old) {
 171                 if(window_name) {
 172                     var cwidth = scormplayerdata.cwidth;
 173                     var cheight = scormplayerdata.cheight;
 174                     var poptions = scormplayerdata.popupoptions;
 175                     poptions = poptions + ',resizable=yes'; // Added for IE (MDL-32506).
 176                     scorm_openpopup(M.cfg.wwwroot + "/mod/scorm/loadSCO.php?" + node.title, window_name, poptions, cwidth, cheight);
 177                 }
 178             } else {
 179                 content.prepend(obj);
 180             }
 181
 182             if (scorm_hide_nav == false) {
 183                 if (nav_display === 1 && navposition_left > 0 && navposition_top > 0) {
 184                     Y.one('#scorm_object').addClass(cssclasses.scorm_nav_under_content);
 185                 }
 186                 scorm_fixnav();
 187             }
 188             scorm_tree_node.openAll();
 189         };
 190
 191         mod_scorm_activate_item = scorm_activate_item;
 192
 193         /**
 194          * Enables/disables navigation buttons as needed.
 195          * @return void
 196          */
 197         var scorm_fixnav = function() {
 198             var skipprevnode = scorm_skipprev(scorm_current_node);
 199             var prevnode = scorm_prev(scorm_current_node);
 200             var skipnextnode = scorm_skipnext(scorm_current_node);
 201             var nextnode = scorm_next(scorm_current_node);
 202             var upnode = scorm_up(scorm_current_node);
 203
 204             scorm_buttons[0].set('disabled', ((skipprevnode === null) ||
 205                         (typeof(skipprevnode.scoid) === 'undefined') ||
 206                         (scoes_nav[skipprevnode.scoid].isvisible === "false") ||
 207                         (skipprevnode.title === null) ||
 208                         (scoes_nav[launch_sco].hideprevious === 1)));
 209
 210             scorm_buttons[1].set('disabled', ((prevnode === null) ||
 211                         (typeof(prevnode.scoid) === 'undefined') ||
 212                         (scoes_nav[prevnode.scoid].isvisible === "false") ||
 213                         (prevnode.title === null) ||
 214                         (scoes_nav[launch_sco].hideprevious === 1)));
 215
 216             scorm_buttons[2].set('disabled', (upnode === null) ||
 217                         (typeof(upnode.scoid) === 'undefined') ||
 218                         (scoes_nav[upnode.scoid].isvisible === "false") ||
 219                         (upnode.title === null));
 220
 221             scorm_buttons[3].set('disabled', ((nextnode === null) ||
 222                         ((nextnode.title === null) && (scoes_nav[launch_sco].flow !== 1)) ||
 223                         (typeof(nextnode.scoid) === 'undefined') ||
 224                         (scoes_nav[nextnode.scoid].isvisible === "false") ||
 225                         (scoes_nav[launch_sco].hidecontinue === 1)));
 226
 227             scorm_buttons[4].set('disabled', ((skipnextnode === null) ||
 228                         (skipnextnode.title === null) ||
 229                         (typeof(skipnextnode.scoid) === 'undefined') ||
 230                         (scoes_nav[skipnextnode.scoid].isvisible === "false") ||
 231                         scoes_nav[launch_sco].hidecontinue === 1));
 232         };
 233
 234         var scorm_toggle_toc = function(windowresize) {
 235             var toc = Y.one('#scorm_toc');
 236             var scorm_content = Y.one('#scorm_content');
 237             var scorm_toc_toggle_btn = Y.one('#scorm_toc_toggle_btn');
 238             var toc_disabled = toc.hasClass('disabled');
 239             var disabled_by = toc.getAttribute('disabled-by');
 240             // Remove width element style from resize handle.
 241             toc.setStyle('width', null);
 242             scorm_content.setStyle('width', null);
 243             if (windowresize === true) {
 244                 if (disabled_by === 'user') {
 245                     return;
 246                 }
 247                 var body = Y.one('body');
 248                 if (body.get('winWidth') < collapsetocwinsize) {
 249                     toc.addClass(cssclasses.disabled)
 250                         .setAttribute('disabled-by', 'screen-size');
 251                     scorm_toc_toggle_btn.setHTML('&gt;')
 252                         .set('title', M.util.get_string('show', 'moodle'));
 253                     scorm_content.removeClass(cssclasses.scorm_grid_content_toc_visible)
 254                         .addClass(cssclasses.scorm_grid_content_toc_hidden);
 255                 } else if (body.get('winWidth') > collapsetocwinsize) {
 256                     toc.removeClass(cssclasses.disabled)
 257                         .removeAttribute('disabled-by');
 258                     scorm_toc_toggle_btn.setHTML('&lt;')
 259                         .set('title', M.util.get_string('hide', 'moodle'));
 260                     scorm_content.removeClass(cssclasses.scorm_grid_content_toc_hidden)
 261                         .addClass(cssclasses.scorm_grid_content_toc_visible);
 262                 }
 263                 return;
 264             }
 265             if (toc_disabled) {
 266                 toc.removeClass(cssclasses.disabled)
 267                     .removeAttribute('disabled-by');
 268                 scorm_toc_toggle_btn.setHTML('&lt;')
 269                     .set('title', M.util.get_string('hide', 'moodle'));
 270                 scorm_content.removeClass(cssclasses.scorm_grid_content_toc_hidden)
 271                     .addClass(cssclasses.scorm_grid_content_toc_visible);
 272             } else {
 273                 toc.addClass(cssclasses.disabled)
 274                     .setAttribute('disabled-by', 'user');
 275                 scorm_toc_toggle_btn.setHTML('&gt;')
 276                     .set('title', M.util.get_string('show', 'moodle'));
 277                 scorm_content.removeClass(cssclasses.scorm_grid_content_toc_visible)
 278                     .addClass(cssclasses.scorm_grid_content_toc_hidden);
 279             }
 280         };
 281
 282         var scorm_resize_layout = function() {
 283             if (window_name) {
 284                 return;
 285             }
 286
 287             // make sure that the max width of the TOC doesn't go to far
 288
 289             var scorm_toc_node = Y.one('#scorm_toc');
 290             var maxwidth = parseInt(Y.one('#scorm_layout').getComputedStyle('width'), 10);
 291             scorm_toc_node.setStyle('maxWidth', (maxwidth - 200));
 292             var cwidth = parseInt(scorm_toc_node.getComputedStyle('width'), 10);
 293             if (cwidth > (maxwidth - 1)) {
 294                 scorm_toc_node.setStyle('width', (maxwidth - 50));
 295             }
 296
 297             // Calculate the rough new height from the viewport height.
 298             newheight = Y.one('body').get('winHeight') - 5;
 299             if (newheight < 600) {
 300                 newheight = 600;
 301             }
 302             Y.one('#scorm_layout').setStyle('height', newheight);
 303
 304         };
 305
 306         // Handle AJAX Request
 307         var scorm_ajax_request = function(url, datastring) {
 308             var myRequest = NewHttpReq();
 309             var result = DoRequest(myRequest, url + datastring);
 310             return result;
 311         };
 312
 313         var scorm_up = function(node, update_launch_sco) {
 314             if (node.parent && node.parent.parent && typeof scoes_nav[launch_sco].parentscoid !== 'undefined') {
 315                 var parentscoid = scoes_nav[launch_sco].parentscoid;
 316                 var parent = node.parent;
 317                 if (parent.title !== scoes_nav[parentscoid].url) {
 318                     parent = scorm_tree_node.getNodeByAttribute('title', scoes_nav[parentscoid].url);
 319                     if (parent === null) {
 320                         parent = scorm_tree_node.rootNode.children[0];
 321                         parent.title = scoes_nav[parentscoid].url;
 322                     }
 323                 }
 324                 if (update_launch_sco) {
 325                     launch_sco = parentscoid;
 326                 }
 327                 return parent;
 328             }
 329             return null;
 330         };
 331
 332         var scorm_lastchild = function(node) {
 333             if (node.children.length) {
 334                 return scorm_lastchild(node.children[node.children.length - 1]);
 335             } else {
 336                 return node;
 337             }
 338         };
 339
 340         var scorm_prev = function(node, update_launch_sco) {
 341             if (node.previous() && node.previous().children.length &&
 342                     typeof scoes_nav[launch_sco].prevscoid !== 'undefined') {
 343                 node = scorm_lastchild(node.previous());
 344                 if (node) {
 345                     var prevscoid = scoes_nav[launch_sco].prevscoid;
 346                     if (node.title !== scoes_nav[prevscoid].url) {
 347                         node = scorm_tree_node.getNodeByAttribute('title', scoes_nav[prevscoid].url);
 348                         if (node === null) {
 349                             node = scorm_tree_node.rootNode.children[0];
 350                             node.title = scoes_nav[prevscoid].url;
 351                         }
 352                     }
 353                     if (update_launch_sco) {
 354                         launch_sco = prevscoid;
 355                     }
 356                     return node;
 357                 } else {
 358                     return null;
 359                 }
 360             }
 361             return scorm_skipprev(node, update_launch_sco);
 362         };
 363
 364         var scorm_skipprev = function(node, update_launch_sco) {
 365             if (node.previous() && typeof scoes_nav[launch_sco].prevsibling !== 'undefined') {
 366                 var prevsibling = scoes_nav[launch_sco].prevsibling;
 367                 var previous = node.previous();
 368                 var prevscoid = scoes_nav[launch_sco].prevscoid;
 369                 if (previous.title !== scoes_nav[prevscoid].url) {
 370                     previous = scorm_tree_node.getNodeByAttribute('title', scoes_nav[prevsibling].url);
 371                     if (previous === null) {
 372                         previous = scorm_tree_node.rootNode.children[0];
 373                         previous.title = scoes_nav[prevsibling].url;
 374                     }
 375                 }
 376                 if (update_launch_sco) {
 377                     launch_sco = prevsibling;
 378                 }
 379                 return previous;
 380             } else if (node.parent && node.parent.parent && typeof scoes_nav[launch_sco].parentscoid !== 'undefined') {
 381                 var parentscoid = scoes_nav[launch_sco].parentscoid;
 382                 var parent = node.parent;
 383                 if (parent.title !== scoes_nav[parentscoid].url) {
 384                     parent = scorm_tree_node.getNodeByAttribute('title', scoes_nav[parentscoid].url);
 385                     if (parent === null) {
 386                         parent = scorm_tree_node.rootNode.children[0];
 387                         parent.title = scoes_nav[parentscoid].url;
 388                     }
 389                 }
 390                 if (update_launch_sco) {
 391                     launch_sco = parentscoid;
 392                 }
 393                 return parent;
 394             }
 395             return null;
 396         };
 397
 398         var scorm_next = function(node, update_launch_sco) {
 399             if (node === false) {
 400                 return scorm_tree_node.children[0];
 401             }
 402             if (node.children.length && typeof scoes_nav[launch_sco].nextscoid != 'undefined') {
 403                 node = node.children[0];
 404                 var nextscoid = scoes_nav[launch_sco].nextscoid;
 405                 if (node.title !== scoes_nav[nextscoid].url) {
 406                     node = scorm_tree_node.getNodeByAttribute('title', scoes_nav[nextscoid].url);
 407                     if (node === null) {
 408                         node = scorm_tree_node.rootNode.children[0];
 409                         node.title = scoes_nav[nextscoid].url;
 410                     }
 411                 }
 412                 if (update_launch_sco) {
 413                     launch_sco = nextscoid;
 414                 }
 415                 return node;
 416             }
 417             return scorm_skipnext(node, update_launch_sco);
 418         };
 419
 420         var scorm_skipnext = function(node, update_launch_sco) {
 421             var next = node.next();
 422             if (next && next.title && typeof scoes_nav[launch_sco] !== 'undefined' && typeof scoes_nav[launch_sco].nextsibling !== 'undefined') {
 423                 var nextsibling = scoes_nav[launch_sco].nextsibling;
 424                 if (next.title !== scoes_nav[nextsibling].url) {
 425                     next = scorm_tree_node.getNodeByAttribute('title', scoes_nav[nextsibling].url);
 426                     if (next === null) {
 427                         next = scorm_tree_node.rootNode.children[0];
 428                         next.title = scoes_nav[nextsibling].url;
 429                     }
 430                 }
 431                 if (update_launch_sco) {
 432                     launch_sco = nextsibling;
 433                 }
 434                 return next;
 435             } else if (node.parent && node.parent.parent && typeof scoes_nav[launch_sco].parentscoid !== 'undefined') {
 436                 var parentscoid = scoes_nav[launch_sco].parentscoid;
 437                 var parent = node.parent;
 438                 if (parent.title !== scoes_nav[parentscoid].url) {
 439                     parent = scorm_tree_node.getNodeByAttribute('title', scoes_nav[parentscoid].url);
 440                     if (parent === null) {
 441                         parent = scorm_tree_node.rootNode.children[0];
 442                     }
 443                 }
 444                 if (update_launch_sco) {
 445                     launch_sco = parentscoid;
 446                 }
 447                 return scorm_skipnext(parent, update_launch_sco);
 448             }
 449             return null;
 450         };
 451
 452         // Launch prev sco
 453         var scorm_launch_prev_sco = function() {
 454             var result = null;
 455             if (scoes_nav[launch_sco].flow === 1) {
 456                 var datastring = scoes_nav[launch_sco].url + '&function=scorm_seq_flow&request=backward';
 457                 result = scorm_ajax_request(M.cfg.wwwroot + '/mod/scorm/datamodels/sequencinghandler.php?', datastring);
 458                 mod_scorm_seq = encodeURIComponent(result);
 459                 result = Y.JSON.parse (result);
 460                 if (typeof result.nextactivity.id != undefined) {
 461                         var node = scorm_prev(scorm_tree_node.getSelectedNodes()[0]);
 462                         if (node == null) {
 463                             // Avoid use of TreeView for Navigation.
 464                             node = scorm_tree_node.getSelectedNodes()[0];
 465                         }
 466                         if (node.title !== scoes_nav[result.nextactivity.id].url) {
 467                             node = scorm_tree_node.getNodeByAttribute('title', scoes_nav[result.nextactivity.id].url);
 468                             if (node === null) {
 469                                 node = scorm_tree_node.rootNode.children[0];
 470                                 node.title = scoes_nav[result.nextactivity.id].url;
 471                             }
 472                         }
 473                         launch_sco = result.nextactivity.id;
 474                         scorm_activate_item(node);
 475                         scorm_fixnav();
 476                 } else {
 477                         scorm_activate_item(scorm_prev(scorm_tree_node.getSelectedNodes()[0], true));
 478                 }
 479             } else {
 480                 scorm_activate_item(scorm_prev(scorm_tree_node.getSelectedNodes()[0], true));
 481             }
 482         };
 483
 484         // Launch next sco
 485         var scorm_launch_next_sco = function () {
 486             var result = null;
 487             if (scoes_nav[launch_sco].flow === 1) {
 488                 var datastring = scoes_nav[launch_sco].url + '&function=scorm_seq_flow&request=forward';
 489                 result = scorm_ajax_request(M.cfg.wwwroot + '/mod/scorm/datamodels/sequencinghandler.php?', datastring);
 490                 mod_scorm_seq = encodeURIComponent(result);
 491                 result = Y.JSON.parse (result);
 492                 if (typeof result.nextactivity !== 'undefined' && typeof result.nextactivity.id !== 'undefined') {
 493                     var node = scorm_next(scorm_tree_node.getSelectedNodes()[0]);
 494                     if (node === null) {
 495                         // Avoid use of TreeView for Navigation.
 496                         node = scorm_tree_node.getSelectedNodes()[0];
 497                     }
 498                     node = scorm_tree_node.getNodeByAttribute('title', scoes_nav[result.nextactivity.id].url);
 499                     if (node === null) {
 500                         node = scorm_tree_node.rootNode.children[0];
 501                         node.title = scoes_nav[result.nextactivity.id].url;
 502                     }
 503                     launch_sco = result.nextactivity.id;
 504                     scorm_activate_item(node);
 505                     scorm_fixnav();
 506                 } else {
 507                     scorm_activate_item(scorm_next(scorm_tree_node.getSelectedNodes()[0], true));
 508                 }
 509             } else {
 510                 scorm_activate_item(scorm_next(scorm_tree_node.getSelectedNodes()[0], true));
 511             }
 512         };
 513
 514         mod_scorm_launch_prev_sco = scorm_launch_prev_sco;
 515         mod_scorm_launch_next_sco = scorm_launch_next_sco;
 516
 517         var cssclasses = {
 518                 // YUI grid class: use 100% of the available width to show only content, TOC hidden.
 519                 scorm_grid_content_toc_hidden: 'yui3-u-1',
 520                 // YUI grid class: use 1/5 of the available width to show TOC.
 521                 scorm_grid_toc: 'yui3-u-1-5',
 522                 // YUI grid class: use 1/24 of the available width to show TOC toggle button.
 523                 scorm_grid_toggle: 'yui3-u-1-24',
 524                 // YUI grid class: use 3/4 of the available width to show content, TOC visible.
 525                 scorm_grid_content_toc_visible: 'yui3-u-3-4',
 526                 // Reduce height of #scorm_object to accomodate nav buttons under content.
 527                 scorm_nav_under_content: 'scorm_nav_under_content',
 528                 disabled: 'disabled'
 529             };
 530         // layout
 531         Y.one('#scorm_toc_title').setHTML(toc_title);
 532
 533         if (scorm_disable_toc) {
 534             Y.one('#scorm_toc').addClass(cssclasses.disabled);
 535             Y.one('#scorm_toc_toggle').addClass(cssclasses.disabled);
 536             Y.one('#scorm_content').addClass(cssclasses.scorm_grid_content_toc_hidden);
 537         } else {
 538             Y.one('#scorm_toc').addClass(cssclasses.scorm_grid_toc);
 539             Y.one('#scorm_toc_toggle').addClass(cssclasses.scorm_grid_toggle);
 540             Y.one('#scorm_toc_toggle_btn')
 541                 .setHTML('&lt;')
 542                 .setAttribute('title', M.util.get_string('hide', 'moodle'));
 543             Y.one('#scorm_content').addClass(cssclasses.scorm_grid_content_toc_visible);
 544             scorm_toggle_toc(true);
 545         }
 546
 547         // hide the TOC if that is the default
 548         if (!scorm_disable_toc) {
 549             if (scorm_hide_toc == true) {
 550                 Y.one('#scorm_toc').addClass(cssclasses.disabled);
 551                 Y.one('#scorm_toc_toggle_btn')
 552                     .setHTML('&gt;')
 553                     .setAttribute('title', M.util.get_string('show', 'moodle'));
 554                 Y.one('#scorm_content')
 555                     .removeClass(cssclasses.scorm_grid_content_toc_visible)
 556                     .addClass(cssclasses.scorm_grid_content_toc_hidden);
 557             }
 558         }
 559
 560         // TOC Resize handle.
 561         var layout_width = parseInt(Y.one('#scorm_layout').getComputedStyle('width'), 10);
 562         var scorm_resize_handle = new Y.Resize({
 563             node: '#scorm_toc',
 564             handles: 'r',
 565             defMinWidth: 0.2 * layout_width
 566         });
 567         // TOC tree
 568         var toc_source = Y.one('#scorm_tree > ul');
 569         var toc = scorm_parse_toc_tree(toc_source);
 570         // Empty container after parsing toc.
 571         var el = document.getElementById('scorm_tree');
 572         el.innerHTML = '';
 573         var tree = new Y.TreeView({
 574             container: '#scorm_tree',
 575             nodes: toc,
 576             multiSelect: false
 577         });
 578         scorm_tree_node = tree;
 579         // Trigger after instead of on, avoid recursive calls.
 580         tree.after('select', function(e) {
 581             var node = e.node;
 582             if (node.title == '' || node.title == null) {
 583                 return; //this item has no navigation
 584             }
 585
 586             // If item is already active, return; avoid recursive calls.
 587             if (obj = Y.one('#scorm_object')) {
 588                 var scorm_active_url = obj.getAttribute('src');
 589                 var node_full_url = M.cfg.wwwroot + '/mod/scorm/loadSCO.php?' + node.title;
 590                 if (node_full_url === scorm_active_url) {
 591                     return;
 592                 }
 593             } else if(scorm_current_node == node){
 594                 return;
 595             }
 596
 597             // Update launch_sco.
 598             if (typeof node.scoid !== 'undefined') {
 599                 launch_sco = node.scoid;
 600             }
 601             scorm_activate_item(node);
 602             if (node.children.length) {
 603                 scorm_bloody_labelclick = true;
 604             }
 605         });
 606         if (!scorm_disable_toc) {
 607             tree.on('close', function(e) {
 608                 if (scorm_bloody_labelclick) {
 609                     scorm_bloody_labelclick = false;
 610                     return false;
 611                 }
 612             });
 613             tree.subscribe('open', function(e) {
 614                 if (scorm_bloody_labelclick) {
 615                     scorm_bloody_labelclick = false;
 616                     return false;
 617                 }
 618             });
 619         }
 620         tree.render();
 621         tree.openAll();
 622
 623         // On getting the window, always set the focus on the current item
 624         Y.one(Y.config.win).on('focus', function (e) {
 625             var current = scorm_tree_node.getSelectedNodes()[0];
 626             var toc_disabled = Y.one('#scorm_toc').hasClass('disabled');
 627             if (current.id && !toc_disabled) {
 628                 Y.one('#' + current.id).focus();
 629             }
 630         });
 631
 632         // navigation
 633         if (scorm_hide_nav == false) {
 634             // TODO: make some better&accessible buttons.
 635             var navbuttonshtml = '<span id="scorm_nav"><button id="nav_skipprev">&lt;&lt;</button>&nbsp;' +
 636                                     '<button id="nav_prev">&lt;</button>&nbsp;<button id="nav_up">^</button>&nbsp;' +
 637                                     '<button id="nav_next">&gt;</button>&nbsp;<button id="nav_skipnext">&gt;&gt;</button></span>';
 638             if (nav_display === 1) {
 639                 Y.one('#scorm_navpanel').setHTML(navbuttonshtml);
 640             } else {
 641                 // Nav panel is floating type.
 642                 var navposition = null;
 643                 if (navposition_left < 0 && navposition_top < 0) {
 644                     // Set default XY.
 645                     navposition = Y.one('#scorm_toc').getXY();
 646                     navposition[1] += 200;
 647                 } else {
 648                     // Set user defined XY.
 649                     navposition = [];
 650                     navposition[0] = parseInt(navposition_left, 10);
 651                     navposition[1] = parseInt(navposition_top, 10);
 652                 }
 653                 scorm_nav_panel = new Y.Panel({
 654                     fillHeight: "body",
 655                     headerContent: M.util.get_string('navigation', 'scorm'),
 656                     visible: true,
 657                     xy: navposition,
 658                     zIndex: 999
 659                 });
 660                 scorm_nav_panel.set('bodyContent', navbuttonshtml);
 661                 scorm_nav_panel.removeButton('close');
 662                 scorm_nav_panel.plug(Y.Plugin.Drag, {handles: ['.yui3-widget-hd']});
 663                 scorm_nav_panel.render();
 664             }
 665
 666             scorm_buttons[0] = new Y.Button({
 667                 srcNode: '#nav_skipprev',
 668                 render: true,
 669                 on: {
 670                         'click' : function(ev) {
 671                             scorm_activate_item(scorm_skipprev(scorm_tree_node.getSelectedNodes()[0], true));
 672                         },
 673                         'keydown' : function(ev) {
 674                             if (ev.domEvent.keyCode === 13 || ev.domEvent.keyCode === 32) {
 675                                 scorm_activate_item(scorm_skipprev(scorm_tree_node.getSelectedNodes()[0], true));
 676                             }
 677                         }
 678                     }
 679             });
 680             scorm_buttons[1] = new Y.Button({
 681                 srcNode: '#nav_prev',
 682                 render: true,
 683                 on: {
 684                     'click' : function(ev) {
 685                         scorm_launch_prev_sco();
 686                     },
 687                     'keydown' : function(ev) {
 688                         if (ev.domEvent.keyCode === 13 || ev.domEvent.keyCode === 32) {
 689                             scorm_launch_prev_sco();
 690                         }
 691                     }
 692                 }
 693             });
 694             scorm_buttons[2] = new Y.Button({
 695                 srcNode: '#nav_up',
 696                 render: true,
 697                 on: {
 698                     'click' : function(ev) {
 699                         scorm_activate_item(scorm_up(scorm_tree_node.getSelectedNodes()[0], true));
 700                     },
 701                     'keydown' : function(ev) {
 702                         if (ev.domEvent.keyCode === 13 || ev.domEvent.keyCode === 32) {
 703                             scorm_activate_item(scorm_up(scorm_tree_node.getSelectedNodes()[0], true));
 704                         }
 705                     }
 706                 }
 707             });
 708             scorm_buttons[3] = new Y.Button({
 709                 srcNode: '#nav_next',
 710                 render: true,
 711                 on: {
 712                     'click' : function(ev) {
 713                         scorm_launch_next_sco();
 714                     },
 715                     'keydown' : function(ev) {
 716                         if (ev.domEvent.keyCode === 13 || ev.domEvent.keyCode === 32) {
 717                             scorm_launch_next_sco();
 718                         }
 719                     }
 720                 }
 721             });
 722             scorm_buttons[4] = new Y.Button({
 723                 srcNode: '#nav_skipnext',
 724                 render: true,
 725                 on: {
 726                     'click' : function(ev) {
 727                         scorm_activate_item(scorm_skipnext(scorm_tree_node.getSelectedNodes()[0], true));
 728                     },
 729                     'keydown' : function(ev) {
 730                         if (ev.domEvent.keyCode === 13 || ev.domEvent.keyCode === 32) {
 731                             scorm_activate_item(scorm_skipnext(scorm_tree_node.getSelectedNodes()[0], true));
 732                         }
 733                     }
 734                 }
 735             });
 736         }
 737
 738         // finally activate the chosen item
 739         var scorm_first_url = null;
 740         if (typeof tree.rootNode.children[0] !== 'undefined') {
 741             if (tree.rootNode.children[0].title !== scoes_nav[launch_sco].url) {
 742                 var node = tree.getNodeByAttribute('title', scoes_nav[launch_sco].url);
 743                 if (node !== null) {
 744                     scorm_first_url = node;
 745                 }
 746             } else {
 747                 scorm_first_url = tree.rootNode.children[0];
 748             }
 749         }
 750
 751         if (scorm_first_url == null) { // This is probably a single sco with no children (AICC Direct uses this).
 752             scorm_first_url = tree.rootNode;
 753         }
 754         scorm_first_url.title = scoes_nav[launch_sco].url;
 755         scorm_activate_item(scorm_first_url);
 756
 757         // resizing
 758         scorm_resize_layout();
 759
 760         // Collapse/expand TOC.
 761         Y.one('#scorm_toc_toggle').on('click', scorm_toggle_toc);
 762         Y.one('#scorm_toc_toggle').on('key', scorm_toggle_toc, 'down:enter,32');
 763         // fix layout if window resized
 764         Y.on("windowresize", function() {
 765             scorm_resize_layout();
 766             var toc_displayed = Y.one('#scorm_toc').getComputedStyle('display') !== 'none';
 767             if ((!scorm_disable_toc && !scorm_hide_toc) || toc_displayed) {
 768                 scorm_toggle_toc(true);
 769             }
 770             // Set 20% as minWidth constrain of TOC.
 771             var layout_width = parseInt(Y.one('#scorm_layout').getComputedStyle('width'), 10);
 772             scorm_resize_handle.set('defMinWidth', 0.2 * layout_width);
 773         });
 774         // On resize drag, change width of scorm_content.
 775         scorm_resize_handle.on('resize:resize', function() {
 776             var tocwidth = parseInt(Y.one('#scorm_toc').getComputedStyle('width'), 10);
 777             var layoutwidth = parseInt(Y.one('#scorm_layout').getStyle('width'), 10);
 778             Y.one('#scorm_content').setStyle('width', (layoutwidth - tocwidth - 60));
 779         });
 780     });
 781 };
 782
 783 M.mod_scorm.connectPrereqCallback = {
 784
 785     success: function(id, o) {
 786         if (o.responseText !== undefined) {
 787             var snode = null,
 788                 stitle = null;
 789             if (scorm_tree_node && o.responseText) {
 790                 snode = scorm_tree_node.getSelectedNodes()[0];
 791                 stitle = null;
 792                 if (snode) {
 793                     stitle = snode.title;
 794                 }
 795                 // All gone with clear, add new root node.
 796                 scorm_tree_node.clear(scorm_tree_node.createNode());
 797             }
 798             // Make sure the temporary tree element is not there.
 799             var el_old_tree = document.getElementById('scormtree123');
 800             if (el_old_tree) {
 801                 el_old_tree.parentNode.removeChild(el_old_tree);
 802             }
 803             var el_new_tree = document.createElement('div');
 804             var pagecontent = document.getElementById("page-content");
 805             if (!pagecontent) {
 806                 pagecontent = document.getElementById("content");
 807             }
 808             el_new_tree.setAttribute('id','scormtree123');
 809             el_new_tree.innerHTML = o.responseText;
 810             // Make sure it does not show.
 811             el_new_tree.style.display = 'none';
 812             pagecontent.appendChild(el_new_tree);
 813             // Ignore the first level element as this is the title.
 814             var startNode = el_new_tree.firstChild.firstChild;
 815             if (startNode.tagName == 'LI') {
 816                 // Go back to the beginning.
 817                 startNode = el_new_tree;
 818             }
 819             var toc_source = Y.one('#scormtree123 > ul');
 820             var toc = mod_scorm_parse_toc_tree(toc_source);
 821             scorm_tree_node.appendNode(scorm_tree_node.rootNode, toc);
 822             var el = document.getElementById('scormtree123');
 823             el.parentNode.removeChild(el);
 824             scorm_tree_node.render();
 825             scorm_tree_node.openAll();
 826             if (stitle !== null) {
 827                 snode = scorm_tree_node.getNodeByAttribute('title', stitle);
 828                 // Do not let destroyed node to be selected.
 829                 if (snode && !snode.state.destroyed) {
 830                     snode.select();
 831                     var toc_disabled = Y.one('#scorm_toc').hasClass('disabled');
 832                     if (!toc_disabled) {
 833                         if (!snode.state.selected) {
 834                             snode.select();
 835                         }
 836                     }
 837                 }
 838             }
 839         }
 840     },
 841
 842     failure: function(id, o) {
 843         // TODO: do some sort of error handling.
 844     }
 845
 846 };