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             obj.setAttribute('allowfullscreen', 'allowfullscreen');
 160             obj.setAttribute('webkitallowfullscreen', 'webkitallowfullscreen');
 161             obj.setAttribute('mozallowfullscreen', 'mozallowfullscreen');
 162             if (!window_name && node.title != null) {
 163                 obj.setAttribute('src', url_prefix + node.title);
 164             }
 165             if (window_name) {
 166                 var mine = window.open('','','width=1,height=1,left=0,top=0,scrollbars=no');
 167                 if(! mine) {
 168                     alert(M.util.get_string('popupsblocked', 'scorm'));
 169                 }
 170                 mine.close();
 171             }
 172
 173             if (old) {
 174                 if(window_name) {
 175                     var cwidth = scormplayerdata.cwidth;
 176                     var cheight = scormplayerdata.cheight;
 177                     var poptions = scormplayerdata.popupoptions;
 178                     poptions = poptions + ',resizable=yes'; // Added for IE (MDL-32506).
 179                     scorm_openpopup(M.cfg.wwwroot + "/mod/scorm/loadSCO.php?" + node.title, window_name, poptions, cwidth, cheight);
 180                 }
 181             } else {
 182                 content.prepend(obj);
 183             }
 184
 185             if (scorm_hide_nav == false) {
 186                 if (nav_display === 1 && navposition_left > 0 && navposition_top > 0) {
 187                     Y.one('#scorm_object').addClass(cssclasses.scorm_nav_under_content);
 188                 }
 189                 scorm_fixnav();
 190             }
 191             scorm_tree_node.openAll();
 192         };
 193
 194         mod_scorm_activate_item = scorm_activate_item;
 195
 196         /**
 197          * Enables/disables navigation buttons as needed.
 198          * @return void
 199          */
 200         var scorm_fixnav = function() {
 201             var skipprevnode = scorm_skipprev(scorm_current_node);
 202             var prevnode = scorm_prev(scorm_current_node);
 203             var skipnextnode = scorm_skipnext(scorm_current_node);
 204             var nextnode = scorm_next(scorm_current_node);
 205             var upnode = scorm_up(scorm_current_node);
 206
 207             scorm_buttons[0].set('disabled', ((skipprevnode === null) ||
 208                         (typeof(skipprevnode.scoid) === 'undefined') ||
 209                         (scoes_nav[skipprevnode.scoid].isvisible === "false") ||
 210                         (skipprevnode.title === null) ||
 211                         (scoes_nav[launch_sco].hideprevious === 1)));
 212
 213             scorm_buttons[1].set('disabled', ((prevnode === null) ||
 214                         (typeof(prevnode.scoid) === 'undefined') ||
 215                         (scoes_nav[prevnode.scoid].isvisible === "false") ||
 216                         (prevnode.title === null) ||
 217                         (scoes_nav[launch_sco].hideprevious === 1)));
 218
 219             scorm_buttons[2].set('disabled', (upnode === null) ||
 220                         (typeof(upnode.scoid) === 'undefined') ||
 221                         (scoes_nav[upnode.scoid].isvisible === "false") ||
 222                         (upnode.title === null));
 223
 224             scorm_buttons[3].set('disabled', ((nextnode === null) ||
 225                         ((nextnode.title === null) && (scoes_nav[launch_sco].flow !== 1)) ||
 226                         (typeof(nextnode.scoid) === 'undefined') ||
 227                         (scoes_nav[nextnode.scoid].isvisible === "false") ||
 228                         (scoes_nav[launch_sco].hidecontinue === 1)));
 229
 230             scorm_buttons[4].set('disabled', ((skipnextnode === null) ||
 231                         (skipnextnode.title === null) ||
 232                         (typeof(skipnextnode.scoid) === 'undefined') ||
 233                         (scoes_nav[skipnextnode.scoid].isvisible === "false") ||
 234                         scoes_nav[launch_sco].hidecontinue === 1));
 235         };
 236
 237         var scorm_toggle_toc = function(windowresize) {
 238             var toc = Y.one('#scorm_toc');
 239             var scorm_content = Y.one('#scorm_content');
 240             var scorm_toc_toggle_btn = Y.one('#scorm_toc_toggle_btn');
 241             var toc_disabled = toc.hasClass('disabled');
 242             var disabled_by = toc.getAttribute('disabled-by');
 243             // Remove width element style from resize handle.
 244             toc.setStyle('width', null);
 245             scorm_content.setStyle('width', null);
 246             if (windowresize === true) {
 247                 if (disabled_by === 'user') {
 248                     return;
 249                 }
 250                 var body = Y.one('body');
 251                 if (body.get('winWidth') < collapsetocwinsize) {
 252                     toc.addClass(cssclasses.disabled)
 253                         .setAttribute('disabled-by', 'screen-size');
 254                     scorm_toc_toggle_btn.setHTML('&gt;')
 255                         .set('title', M.util.get_string('show', 'moodle'));
 256                     scorm_content.removeClass(cssclasses.scorm_grid_content_toc_visible)
 257                         .addClass(cssclasses.scorm_grid_content_toc_hidden);
 258                 } else if (body.get('winWidth') > collapsetocwinsize) {
 259                     toc.removeClass(cssclasses.disabled)
 260                         .removeAttribute('disabled-by');
 261                     scorm_toc_toggle_btn.setHTML('&lt;')
 262                         .set('title', M.util.get_string('hide', 'moodle'));
 263                     scorm_content.removeClass(cssclasses.scorm_grid_content_toc_hidden)
 264                         .addClass(cssclasses.scorm_grid_content_toc_visible);
 265                 }
 266                 return;
 267             }
 268             if (toc_disabled) {
 269                 toc.removeClass(cssclasses.disabled)
 270                     .removeAttribute('disabled-by');
 271                 scorm_toc_toggle_btn.setHTML('&lt;')
 272                     .set('title', M.util.get_string('hide', 'moodle'));
 273                 scorm_content.removeClass(cssclasses.scorm_grid_content_toc_hidden)
 274                     .addClass(cssclasses.scorm_grid_content_toc_visible);
 275             } else {
 276                 toc.addClass(cssclasses.disabled)
 277                     .setAttribute('disabled-by', 'user');
 278                 scorm_toc_toggle_btn.setHTML('&gt;')
 279                     .set('title', M.util.get_string('show', 'moodle'));
 280                 scorm_content.removeClass(cssclasses.scorm_grid_content_toc_visible)
 281                     .addClass(cssclasses.scorm_grid_content_toc_hidden);
 282             }
 283         };
 284
 285         var scorm_resize_layout = function() {
 286             if (window_name) {
 287                 return;
 288             }
 289
 290             // make sure that the max width of the TOC doesn't go to far
 291
 292             var scorm_toc_node = Y.one('#scorm_toc');
 293             var maxwidth = parseInt(Y.one('#scorm_layout').getComputedStyle('width'), 10);
 294             scorm_toc_node.setStyle('maxWidth', (maxwidth - 200));
 295             var cwidth = parseInt(scorm_toc_node.getComputedStyle('width'), 10);
 296             if (cwidth > (maxwidth - 1)) {
 297                 scorm_toc_node.setStyle('width', (maxwidth - 50));
 298             }
 299
 300             // Calculate the rough new height from the viewport height.
 301             var newheight = Y.one('body').get('winHeight') - 5
 302                 - Y.one('#scorm_layout').getY()
 303                 - window.pageYOffset;
 304             if (newheight < 680 || isNaN(newheight)) {
 305                 newheight = 680;
 306             }
 307             Y.one('#scorm_layout').setStyle('height', newheight);
 308
 309         };
 310
 311         // Handle AJAX Request
 312         var scorm_ajax_request = function(url, datastring) {
 313             var myRequest = NewHttpReq();
 314             var result = DoRequest(myRequest, url + datastring);
 315             return result;
 316         };
 317
 318         var scorm_up = function(node, update_launch_sco) {
 319             if (node.parent && node.parent.parent && typeof scoes_nav[launch_sco].parentscoid !== 'undefined') {
 320                 var parentscoid = scoes_nav[launch_sco].parentscoid;
 321                 var parent = node.parent;
 322                 if (parent.title !== scoes_nav[parentscoid].url) {
 323                     parent = scorm_tree_node.getNodeByAttribute('title', scoes_nav[parentscoid].url);
 324                     if (parent === null) {
 325                         parent = scorm_tree_node.rootNode.children[0];
 326                         parent.title = scoes_nav[parentscoid].url;
 327                     }
 328                 }
 329                 if (update_launch_sco) {
 330                     launch_sco = parentscoid;
 331                 }
 332                 return parent;
 333             }
 334             return null;
 335         };
 336
 337         var scorm_lastchild = function(node) {
 338             if (node.children.length) {
 339                 return scorm_lastchild(node.children[node.children.length - 1]);
 340             } else {
 341                 return node;
 342             }
 343         };
 344
 345         var scorm_prev = function(node, update_launch_sco) {
 346             if (node.previous() && node.previous().children.length &&
 347                     typeof scoes_nav[launch_sco].prevscoid !== 'undefined') {
 348                 node = scorm_lastchild(node.previous());
 349                 if (node) {
 350                     var prevscoid = scoes_nav[launch_sco].prevscoid;
 351                     if (node.title !== scoes_nav[prevscoid].url) {
 352                         node = scorm_tree_node.getNodeByAttribute('title', scoes_nav[prevscoid].url);
 353                         if (node === null) {
 354                             node = scorm_tree_node.rootNode.children[0];
 355                             node.title = scoes_nav[prevscoid].url;
 356                         }
 357                     }
 358                     if (update_launch_sco) {
 359                         launch_sco = prevscoid;
 360                     }
 361                     return node;
 362                 } else {
 363                     return null;
 364                 }
 365             }
 366             return scorm_skipprev(node, update_launch_sco);
 367         };
 368
 369         var scorm_skipprev = function(node, update_launch_sco) {
 370             if (node.previous() && typeof scoes_nav[launch_sco].prevsibling !== 'undefined') {
 371                 var prevsibling = scoes_nav[launch_sco].prevsibling;
 372                 var previous = node.previous();
 373                 var prevscoid = scoes_nav[launch_sco].prevscoid;
 374                 if (previous.title !== scoes_nav[prevscoid].url) {
 375                     previous = scorm_tree_node.getNodeByAttribute('title', scoes_nav[prevsibling].url);
 376                     if (previous === null) {
 377                         previous = scorm_tree_node.rootNode.children[0];
 378                         previous.title = scoes_nav[prevsibling].url;
 379                     }
 380                 }
 381                 if (update_launch_sco) {
 382                     launch_sco = prevsibling;
 383                 }
 384                 return previous;
 385             } else if (node.parent && node.parent.parent && typeof scoes_nav[launch_sco].parentscoid !== 'undefined') {
 386                 var parentscoid = scoes_nav[launch_sco].parentscoid;
 387                 var parent = node.parent;
 388                 if (parent.title !== scoes_nav[parentscoid].url) {
 389                     parent = scorm_tree_node.getNodeByAttribute('title', scoes_nav[parentscoid].url);
 390                     if (parent === null) {
 391                         parent = scorm_tree_node.rootNode.children[0];
 392                         parent.title = scoes_nav[parentscoid].url;
 393                     }
 394                 }
 395                 if (update_launch_sco) {
 396                     launch_sco = parentscoid;
 397                 }
 398                 return parent;
 399             }
 400             return null;
 401         };
 402
 403         var scorm_next = function(node, update_launch_sco) {
 404             if (node === false) {
 405                 return scorm_tree_node.children[0];
 406             }
 407             if (node.children.length && typeof scoes_nav[launch_sco].nextscoid != 'undefined') {
 408                 node = node.children[0];
 409                 var nextscoid = scoes_nav[launch_sco].nextscoid;
 410                 if (node.title !== scoes_nav[nextscoid].url) {
 411                     node = scorm_tree_node.getNodeByAttribute('title', scoes_nav[nextscoid].url);
 412                     if (node === null) {
 413                         node = scorm_tree_node.rootNode.children[0];
 414                         node.title = scoes_nav[nextscoid].url;
 415                     }
 416                 }
 417                 if (update_launch_sco) {
 418                     launch_sco = nextscoid;
 419                 }
 420                 return node;
 421             }
 422             return scorm_skipnext(node, update_launch_sco);
 423         };
 424
 425         var scorm_skipnext = function(node, update_launch_sco) {
 426             var next = node.next();
 427             if (next && next.title && typeof scoes_nav[launch_sco] !== 'undefined' && typeof scoes_nav[launch_sco].nextsibling !== 'undefined') {
 428                 var nextsibling = scoes_nav[launch_sco].nextsibling;
 429                 if (next.title !== scoes_nav[nextsibling].url) {
 430                     next = scorm_tree_node.getNodeByAttribute('title', scoes_nav[nextsibling].url);
 431                     if (next === null) {
 432                         next = scorm_tree_node.rootNode.children[0];
 433                         next.title = scoes_nav[nextsibling].url;
 434                     }
 435                 }
 436                 if (update_launch_sco) {
 437                     launch_sco = nextsibling;
 438                 }
 439                 return next;
 440             } else if (node.parent && node.parent.parent && typeof scoes_nav[launch_sco].parentscoid !== 'undefined') {
 441                 var parentscoid = scoes_nav[launch_sco].parentscoid;
 442                 var parent = node.parent;
 443                 if (parent.title !== scoes_nav[parentscoid].url) {
 444                     parent = scorm_tree_node.getNodeByAttribute('title', scoes_nav[parentscoid].url);
 445                     if (parent === null) {
 446                         parent = scorm_tree_node.rootNode.children[0];
 447                     }
 448                 }
 449                 if (update_launch_sco) {
 450                     launch_sco = parentscoid;
 451                 }
 452                 return scorm_skipnext(parent, update_launch_sco);
 453             }
 454             return null;
 455         };
 456
 457         // Launch prev sco
 458         var scorm_launch_prev_sco = function() {
 459             var result = null;
 460             if (scoes_nav[launch_sco].flow === 1) {
 461                 var datastring = scoes_nav[launch_sco].url + '&function=scorm_seq_flow&request=backward';
 462                 result = scorm_ajax_request(M.cfg.wwwroot + '/mod/scorm/datamodels/sequencinghandler.php?', datastring);
 463                 mod_scorm_seq = encodeURIComponent(result);
 464                 result = Y.JSON.parse (result);
 465                 if (typeof result.nextactivity.id != undefined) {
 466                         var node = scorm_prev(scorm_tree_node.getSelectedNodes()[0]);
 467                         if (node == null) {
 468                             // Avoid use of TreeView for Navigation.
 469                             node = scorm_tree_node.getSelectedNodes()[0];
 470                         }
 471                         if (node.title !== scoes_nav[result.nextactivity.id].url) {
 472                             node = scorm_tree_node.getNodeByAttribute('title', scoes_nav[result.nextactivity.id].url);
 473                             if (node === null) {
 474                                 node = scorm_tree_node.rootNode.children[0];
 475                                 node.title = scoes_nav[result.nextactivity.id].url;
 476                             }
 477                         }
 478                         launch_sco = result.nextactivity.id;
 479                         scorm_activate_item(node);
 480                         scorm_fixnav();
 481                 } else {
 482                         scorm_activate_item(scorm_prev(scorm_tree_node.getSelectedNodes()[0], true));
 483                 }
 484             } else {
 485                 scorm_activate_item(scorm_prev(scorm_tree_node.getSelectedNodes()[0], true));
 486             }
 487         };
 488
 489         // Launch next sco
 490         var scorm_launch_next_sco = function () {
 491             var result = null;
 492             if (scoes_nav[launch_sco].flow === 1) {
 493                 var datastring = scoes_nav[launch_sco].url + '&function=scorm_seq_flow&request=forward';
 494                 result = scorm_ajax_request(M.cfg.wwwroot + '/mod/scorm/datamodels/sequencinghandler.php?', datastring);
 495                 mod_scorm_seq = encodeURIComponent(result);
 496                 result = Y.JSON.parse (result);
 497                 if (typeof result.nextactivity !== 'undefined' && typeof result.nextactivity.id !== 'undefined') {
 498                     var node = scorm_next(scorm_tree_node.getSelectedNodes()[0]);
 499                     if (node === null) {
 500                         // Avoid use of TreeView for Navigation.
 501                         node = scorm_tree_node.getSelectedNodes()[0];
 502                     }
 503                     node = scorm_tree_node.getNodeByAttribute('title', scoes_nav[result.nextactivity.id].url);
 504                     if (node === null) {
 505                         node = scorm_tree_node.rootNode.children[0];
 506                         node.title = scoes_nav[result.nextactivity.id].url;
 507                     }
 508                     launch_sco = result.nextactivity.id;
 509                     scorm_activate_item(node);
 510                     scorm_fixnav();
 511                 } else {
 512                     scorm_activate_item(scorm_next(scorm_tree_node.getSelectedNodes()[0], true));
 513                 }
 514             } else {
 515                 scorm_activate_item(scorm_next(scorm_tree_node.getSelectedNodes()[0], true));
 516             }
 517         };
 518
 519         mod_scorm_launch_prev_sco = scorm_launch_prev_sco;
 520         mod_scorm_launch_next_sco = scorm_launch_next_sco;
 521
 522         var cssclasses = {
 523                 // YUI grid class: use 100% of the available width to show only content, TOC hidden.
 524                 scorm_grid_content_toc_hidden: 'yui3-u-1',
 525                 // YUI grid class: use 1/5 of the available width to show TOC.
 526                 scorm_grid_toc: 'yui3-u-1-5',
 527                 // YUI grid class: use 1/24 of the available width to show TOC toggle button.
 528                 scorm_grid_toggle: 'yui3-u-1-24',
 529                 // YUI grid class: use 3/4 of the available width to show content, TOC visible.
 530                 scorm_grid_content_toc_visible: 'yui3-u-3-4',
 531                 // Reduce height of #scorm_object to accomodate nav buttons under content.
 532                 scorm_nav_under_content: 'scorm_nav_under_content',
 533                 disabled: 'disabled'
 534             };
 535         // layout
 536         Y.one('#scorm_toc_title').setHTML(toc_title);
 537
 538         if (scorm_disable_toc) {
 539             Y.one('#scorm_toc').addClass(cssclasses.disabled);
 540             Y.one('#scorm_toc_toggle').addClass(cssclasses.disabled);
 541             Y.one('#scorm_content').addClass(cssclasses.scorm_grid_content_toc_hidden);
 542         } else {
 543             Y.one('#scorm_toc').addClass(cssclasses.scorm_grid_toc);
 544             Y.one('#scorm_toc_toggle').addClass(cssclasses.scorm_grid_toggle);
 545             Y.one('#scorm_toc_toggle_btn')
 546                 .setHTML('&lt;')
 547                 .setAttribute('title', M.util.get_string('hide', 'moodle'));
 548             Y.one('#scorm_content').addClass(cssclasses.scorm_grid_content_toc_visible);
 549             scorm_toggle_toc(true);
 550         }
 551
 552         // hide the TOC if that is the default
 553         if (!scorm_disable_toc) {
 554             if (scorm_hide_toc == true) {
 555                 Y.one('#scorm_toc').addClass(cssclasses.disabled);
 556                 Y.one('#scorm_toc_toggle_btn')
 557                     .setHTML('&gt;')
 558                     .setAttribute('title', M.util.get_string('show', 'moodle'));
 559                 Y.one('#scorm_content')
 560                     .removeClass(cssclasses.scorm_grid_content_toc_visible)
 561                     .addClass(cssclasses.scorm_grid_content_toc_hidden);
 562             }
 563         }
 564
 565         // Basic initialization completed, show the elements.
 566         Y.one('#scorm_toc').removeClass('loading');
 567         Y.one('#scorm_toc_toggle').removeClass('loading');
 568
 569         // TOC Resize handle.
 570         var layout_width = parseInt(Y.one('#scorm_layout').getComputedStyle('width'), 10);
 571         var scorm_resize_handle = new Y.Resize({
 572             node: '#scorm_toc',
 573             handles: 'r',
 574             defMinWidth: 0.2 * layout_width
 575         });
 576         // TOC tree
 577         var toc_source = Y.one('#scorm_tree > ul');
 578         var toc = scorm_parse_toc_tree(toc_source);
 579         // Empty container after parsing toc.
 580         var el = document.getElementById('scorm_tree');
 581         el.innerHTML = '';
 582         var tree = new Y.TreeView({
 583             container: '#scorm_tree',
 584             nodes: toc,
 585             multiSelect: false
 586         });
 587         scorm_tree_node = tree;
 588         // Trigger after instead of on, avoid recursive calls.
 589         tree.after('select', function(e) {
 590             var node = e.node;
 591             if (node.title == '' || node.title == null) {
 592                 return; //this item has no navigation
 593             }
 594
 595             // If item is already active, return; avoid recursive calls.
 596             if (obj = Y.one('#scorm_object')) {
 597                 var scorm_active_url = obj.getAttribute('src');
 598                 var node_full_url = M.cfg.wwwroot + '/mod/scorm/loadSCO.php?' + node.title;
 599                 if (node_full_url === scorm_active_url) {
 600                     return;
 601                 }
 602             } else if(scorm_current_node == node){
 603                 return;
 604             }
 605
 606             // Update launch_sco.
 607             if (typeof node.scoid !== 'undefined') {
 608                 launch_sco = node.scoid;
 609             }
 610             scorm_activate_item(node);
 611             if (node.children.length) {
 612                 scorm_bloody_labelclick = true;
 613             }
 614         });
 615         if (!scorm_disable_toc) {
 616             tree.on('close', function(e) {
 617                 if (scorm_bloody_labelclick) {
 618                     scorm_bloody_labelclick = false;
 619                     return false;
 620                 }
 621             });
 622             tree.subscribe('open', function(e) {
 623                 if (scorm_bloody_labelclick) {
 624                     scorm_bloody_labelclick = false;
 625                     return false;
 626                 }
 627             });
 628         }
 629         tree.render();
 630         tree.openAll();
 631
 632         // On getting the window, always set the focus on the current item
 633         Y.one(Y.config.win).on('focus', function (e) {
 634             var current = scorm_tree_node.getSelectedNodes()[0];
 635             var toc_disabled = Y.one('#scorm_toc').hasClass('disabled');
 636             if (current.id && !toc_disabled) {
 637                 Y.one('#' + current.id).focus();
 638             }
 639         });
 640
 641         // navigation
 642         if (scorm_hide_nav == false) {
 643             // TODO: make some better&accessible buttons.
 644             var navbuttonshtml = '<span id="scorm_nav"><button id="nav_skipprev">&lt;&lt;</button>&nbsp;' +
 645                                     '<button id="nav_prev">&lt;</button>&nbsp;<button id="nav_up">^</button>&nbsp;' +
 646                                     '<button id="nav_next">&gt;</button>&nbsp;<button id="nav_skipnext">&gt;&gt;</button></span>';
 647             if (nav_display === 1) {
 648                 Y.one('#scorm_navpanel').setHTML(navbuttonshtml);
 649             } else {
 650                 // Nav panel is floating type.
 651                 var navposition = null;
 652                 if (navposition_left < 0 && navposition_top < 0) {
 653                     // Set default XY.
 654                     navposition = Y.one('#scorm_toc').getXY();
 655                     navposition[1] += 200;
 656                 } else {
 657                     // Set user defined XY.
 658                     navposition = [];
 659                     navposition[0] = parseInt(navposition_left, 10);
 660                     navposition[1] = parseInt(navposition_top, 10);
 661                 }
 662                 scorm_nav_panel = new Y.Panel({
 663                     fillHeight: "body",
 664                     headerContent: M.util.get_string('navigation', 'scorm'),
 665                     visible: true,
 666                     xy: navposition,
 667                     zIndex: 999
 668                 });
 669                 scorm_nav_panel.set('bodyContent', navbuttonshtml);
 670                 scorm_nav_panel.removeButton('close');
 671                 scorm_nav_panel.plug(Y.Plugin.Drag, {handles: ['.yui3-widget-hd']});
 672                 scorm_nav_panel.render();
 673             }
 674
 675             scorm_buttons[0] = new Y.Button({
 676                 srcNode: '#nav_skipprev',
 677                 render: true,
 678                 on: {
 679                         'click' : function(ev) {
 680                             scorm_activate_item(scorm_skipprev(scorm_tree_node.getSelectedNodes()[0], true));
 681                         },
 682                         'keydown' : function(ev) {
 683                             if (ev.domEvent.keyCode === 13 || ev.domEvent.keyCode === 32) {
 684                                 scorm_activate_item(scorm_skipprev(scorm_tree_node.getSelectedNodes()[0], true));
 685                             }
 686                         }
 687                     }
 688             });
 689             scorm_buttons[1] = new Y.Button({
 690                 srcNode: '#nav_prev',
 691                 render: true,
 692                 on: {
 693                     'click' : function(ev) {
 694                         scorm_launch_prev_sco();
 695                     },
 696                     'keydown' : function(ev) {
 697                         if (ev.domEvent.keyCode === 13 || ev.domEvent.keyCode === 32) {
 698                             scorm_launch_prev_sco();
 699                         }
 700                     }
 701                 }
 702             });
 703             scorm_buttons[2] = new Y.Button({
 704                 srcNode: '#nav_up',
 705                 render: true,
 706                 on: {
 707                     'click' : function(ev) {
 708                         scorm_activate_item(scorm_up(scorm_tree_node.getSelectedNodes()[0], true));
 709                     },
 710                     'keydown' : function(ev) {
 711                         if (ev.domEvent.keyCode === 13 || ev.domEvent.keyCode === 32) {
 712                             scorm_activate_item(scorm_up(scorm_tree_node.getSelectedNodes()[0], true));
 713                         }
 714                     }
 715                 }
 716             });
 717             scorm_buttons[3] = new Y.Button({
 718                 srcNode: '#nav_next',
 719                 render: true,
 720                 on: {
 721                     'click' : function(ev) {
 722                         scorm_launch_next_sco();
 723                     },
 724                     'keydown' : function(ev) {
 725                         if (ev.domEvent.keyCode === 13 || ev.domEvent.keyCode === 32) {
 726                             scorm_launch_next_sco();
 727                         }
 728                     }
 729                 }
 730             });
 731             scorm_buttons[4] = new Y.Button({
 732                 srcNode: '#nav_skipnext',
 733                 render: true,
 734                 on: {
 735                     'click' : function(ev) {
 736                         scorm_activate_item(scorm_skipnext(scorm_tree_node.getSelectedNodes()[0], true));
 737                     },
 738                     'keydown' : function(ev) {
 739                         if (ev.domEvent.keyCode === 13 || ev.domEvent.keyCode === 32) {
 740                             scorm_activate_item(scorm_skipnext(scorm_tree_node.getSelectedNodes()[0], true));
 741                         }
 742                     }
 743                 }
 744             });
 745         }
 746
 747         // finally activate the chosen item
 748         var scorm_first_url = null;
 749         if (typeof tree.rootNode.children[0] !== 'undefined') {
 750             if (tree.rootNode.children[0].title !== scoes_nav[launch_sco].url) {
 751                 var node = tree.getNodeByAttribute('title', scoes_nav[launch_sco].url);
 752                 if (node !== null) {
 753                     scorm_first_url = node;
 754                 }
 755             } else {
 756                 scorm_first_url = tree.rootNode.children[0];
 757             }
 758         }
 759
 760         if (scorm_first_url == null) { // This is probably a single sco with no children (AICC Direct uses this).
 761             scorm_first_url = tree.rootNode;
 762         }
 763         scorm_first_url.title = scoes_nav[launch_sco].url;
 764         scorm_activate_item(scorm_first_url);
 765
 766         // resizing
 767         scorm_resize_layout();
 768
 769         // Collapse/expand TOC.
 770         Y.one('#scorm_toc_toggle').on('click', scorm_toggle_toc);
 771         Y.one('#scorm_toc_toggle').on('key', scorm_toggle_toc, 'down:enter,32');
 772         // fix layout if window resized
 773         Y.on("windowresize", function() {
 774             scorm_resize_layout();
 775             var toc_displayed = Y.one('#scorm_toc').getComputedStyle('display') !== 'none';
 776             if ((!scorm_disable_toc && !scorm_hide_toc) || toc_displayed) {
 777                 scorm_toggle_toc(true);
 778             }
 779             // Set 20% as minWidth constrain of TOC.
 780             var layout_width = parseInt(Y.one('#scorm_layout').getComputedStyle('width'), 10);
 781             scorm_resize_handle.set('defMinWidth', 0.2 * layout_width);
 782         });
 783         // On resize drag, change width of scorm_content.
 784         scorm_resize_handle.on('resize:resize', function() {
 785             var tocwidth = parseInt(Y.one('#scorm_toc').getComputedStyle('width'), 10);
 786             var layoutwidth = parseInt(Y.one('#scorm_layout').getStyle('width'), 10);
 787             Y.one('#scorm_content').setStyle('width', (layoutwidth - tocwidth - 60));
 788         });
 789     });
 790 };
 791
 792 M.mod_scorm.connectPrereqCallback = {
 793
 794     success: function(id, o) {
 795         if (o.responseText !== undefined) {
 796             var snode = null,
 797                 stitle = null;
 798             if (scorm_tree_node && o.responseText) {
 799                 snode = scorm_tree_node.getSelectedNodes()[0];
 800                 stitle = null;
 801                 if (snode) {
 802                     stitle = snode.title;
 803                 }
 804                 // All gone with clear, add new root node.
 805                 scorm_tree_node.clear(scorm_tree_node.createNode());
 806             }
 807             // Make sure the temporary tree element is not there.
 808             var el_old_tree = document.getElementById('scormtree123');
 809             if (el_old_tree) {
 810                 el_old_tree.parentNode.removeChild(el_old_tree);
 811             }
 812             var el_new_tree = document.createElement('div');
 813             var pagecontent = document.getElementById("page-content");
 814             if (!pagecontent) {
 815                 pagecontent = document.getElementById("content");
 816             }
 817             el_new_tree.setAttribute('id','scormtree123');
 818             el_new_tree.innerHTML = o.responseText;
 819             // Make sure it does not show.
 820             el_new_tree.style.display = 'none';
 821             pagecontent.appendChild(el_new_tree);
 822             // Ignore the first level element as this is the title.
 823             var startNode = el_new_tree.firstChild.firstChild;
 824             if (startNode.tagName == 'LI') {
 825                 // Go back to the beginning.
 826                 startNode = el_new_tree;
 827             }
 828             var toc_source = Y.one('#scormtree123 > ul');
 829             var toc = mod_scorm_parse_toc_tree(toc_source);
 830             scorm_tree_node.appendNode(scorm_tree_node.rootNode, toc);
 831             var el = document.getElementById('scormtree123');
 832             el.parentNode.removeChild(el);
 833             scorm_tree_node.render();
 834             scorm_tree_node.openAll();
 835             if (stitle !== null) {
 836                 snode = scorm_tree_node.getNodeByAttribute('title', stitle);
 837                 // Do not let destroyed node to be selected.
 838                 if (snode && !snode.state.destroyed) {
 839                     snode.select();
 840                     var toc_disabled = Y.one('#scorm_toc').hasClass('disabled');
 841                     if (!toc_disabled) {
 842                         if (!snode.state.selected) {
 843                             snode.select();
 844                         }
 845                     }
 846                 }
 847             }
 848         }
 849     },
 850
 851     failure: function(id, o) {
 852         // TODO: do some sort of error handling.
 853     }
 854
 855 };