CategoryTreeMenu.js

   1 // +-----------------------------------------------------------------------+
   2 // | Copyright (c) 2002-2003, Richard Heyes, Harald Radi                        |
   3 // | All rights reserved.                                                  |
   4 // |                                                                       |
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   7 // | are met:                                                              |
   8 // |                                                                       |
   9 // | o Redistributions of source code must retain the above copyright      |
  10 // |   notice, this list of conditions and the following disclaimer.       |
  11 // | o Redistributions in binary form must reproduce the above copyright   |
  12 // |   notice, this list of conditions and the following disclaimer in the |
  13 // |   documentation and/or other materials provided with the distribution.|
  14 // | o The names of the authors may not be used to endorse or promote      |
  15 // |   products derived from this software without specific prior written  |
  16 // |   permission.                                                         |
  17 // |                                                                       |
  18 // | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS   |
  19 // | "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT     |
  20 // | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
  21 // | A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT  |
  22 // | OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
  23 // | SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT      |
  24 // | LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
  25 // | DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
  26 // | THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT   |
  27 // | (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
  28 // | OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.  |
  29 // |                                                                       |
  30 // +-----------------------------------------------------------------------+
  31 // | Author: Richard Heyes <richard@phpguru.org>                           |
  32 // |         Harald Radi <harald.radi@nme.at>                              |
  33 // +-----------------------------------------------------------------------+
  34 //
  35 // $Id$
  36
  37 /**
  38 * Function to create copies of objects which are
  39 * normally passed around by references (Arrays for example)
  40 */
  41 function arrayCopy(input)
  42 {
  43         var output = new Array(input.length);
  44
  45         for (i in input) {
  46                 if (typeof(input[i]) == 'array') {
  47                         output[i] = arrayCopy(input[i]);
  48                 } else {
  49                         output[i] = input[i];
  50                 }
  51         }
  52
  53         return output;
  54 }
  55
  56 /**
  57 * TreeMenu class
  58 */
  59         function TreeMenu(iconpath, myname, linkTarget, defaultClass, usePersistence, noTopLevelImages)
  60         {
  61                 // Properties
  62                 this.iconpath         = iconpath;
  63                 this.myname           = myname;
  64                 this.linkTarget       = linkTarget;
  65                 this.defaultClass     = defaultClass;
  66                 this.usePersistence   = usePersistence;
  67                 this.noTopLevelImages = noTopLevelImages;
  68                 this.n                = new Array();
  69                 this.output           = '';
  70
  71                 this.nodeRefs       = new Array();
  72                 this.branches       = new Array();
  73                 this.branchStatus   = new Array();
  74                 this.layerRelations = new Array();
  75                 this.childParents   = new Array();
  76                 this.cookieStatuses = new Array();
  77
  78                 this.preloadImages();
  79         }
  80
  81 /**
  82 * Adds a node to the tree
  83 */
  84         TreeMenu.prototype.addItem = function (newNode)
  85         {
  86                 newIndex = this.n.length;
  87                 this.n[newIndex] = newNode;
  88
  89                 return this.n[newIndex];
  90         }
  91
  92 /**
  93 * Preload images hack for Mozilla
  94 */
  95         TreeMenu.prototype.preloadImages = function ()
  96         {
  97                 var plustop    = new Image; plustop.src    = this.iconpath + '/plustop.gif';
  98                 var plusbottom = new Image; plusbottom.src = this.iconpath + '/plusbottom.gif';
  99                 var plus       = new Image; plus.src       = this.iconpath + '/plus.gif';
 100
 101                 var minustop    = new Image; minustop.src    = this.iconpath + '/minustop.gif';
 102                 var minusbottom = new Image; minusbottom.src = this.iconpath + '/minusbottom.gif';
 103                 var minus       = new Image; minus.src       = this.iconpath + '/minus.gif';
 104
 105                 var branchtop    = new Image; branchtop.src    = this.iconpath + '/branchtop.gif';
 106                 var branchbottom = new Image; branchbottom.src = this.iconpath + '/branchbottom.gif';
 107                 var branch       = new Image; branch.src       = this.iconpath + '/branch.gif';
 108
 109                 var linebottom = new Image; linebottom.src = this.iconpath + '/linebottom.gif';
 110                 var line       = new Image; line.src       = this.iconpath + '/line.gif';
 111         }
 112
 113 /**
 114 * Main function that draws the menu and assigns it
 115 * to the layer (or document.write()s it)
 116 */
 117         TreeMenu.prototype.drawMenu = function ()// OPTIONAL ARGS: nodes = [], level = [], prepend = '', expanded = false, visbility = 'inline', parentLayerID = null
 118         {
 119                 /**
 120             * Necessary variables
 121             */
 122                 var output        = '';
 123                 var modifier      = '';
 124                 var layerID       = '';
 125                 var parentLayerID = '';
 126
 127                 /**
 128             * Parse any optional arguments
 129             */
 130                 var nodes         = arguments[0] ? arguments[0] : this.n
 131                 var level         = arguments[1] ? arguments[1] : [];
 132                 var prepend       = arguments[2] ? arguments[2] : '';
 133                 var expanded      = arguments[3] ? arguments[3] : false;
 134                 var visibility    = arguments[4] ? arguments[4] : 'inline';
 135                 var parentLayerID = arguments[5] ? arguments[5] : null;
 136
 137                 var currentlevel  = level.length;
 138
 139                 for (var i=0; i<nodes.length; i++) {
 140
 141                         level[currentlevel] = i+1;
 142                         layerID = this.myname + '_' + 'node_' + this.implode('_', level);
 143
 144                         /**
 145             * Store this object in the nodeRefs array
 146             */
 147                         this.nodeRefs[layerID] = nodes[i];
 148
 149                         /**
 150                 * Store the child/parent relationship
 151                 */
 152                         this.childParents[layerID] = parentLayerID;
 153
 154                         /**
 155                 * Gif modifier
 156                 */
 157                         if (i == 0 && parentLayerID == null) {
 158                                 modifier = nodes.length > 1 ? "top" : 'single';
 159                         } else if(i == (nodes.length-1)) {
 160                                 modifier = "bottom";
 161                         } else {
 162                                 modifier = "";
 163                         }
 164
 165                         /**
 166                 * Single root branch is always expanded
 167                 */
 168                         if (!this.doesMenu() || (parentLayerID == null && (nodes.length == 1 || this.noTopLevelImages))) {
 169                                 expanded = true;
 170
 171                         } else if (nodes[i].expanded) {
 172                                 expanded = true;
 173
 174                         } else {
 175                                 expanded = false;
 176                         }
 177
 178                         /**
 179                 * Make sure visibility is correct based on parent status
 180                 */
 181                         visibility =  this.checkParentVisibility(layerID) ? visibility : 'none';
 182
 183                         /**
 184                 * Setup branch status and build an indexed array
 185                         * of branch layer ids
 186                 */
 187                         if (nodes[i].n.length > 0) {
 188                                 this.branchStatus[layerID] = expanded;
 189                                 this.branches[this.branches.length] = layerID;
 190                         }
 191
 192                         /**
 193                 * Setup toggle relationship
 194                 */
 195                         if (!this.layerRelations[parentLayerID]) {
 196                                 this.layerRelations[parentLayerID] = new Array();
 197                         }
 198                         this.layerRelations[parentLayerID][this.layerRelations[parentLayerID].length] = layerID;
 199
 200                         /**
 201                 * Branch images
 202                 */
 203                         var gifname  = nodes[i].n.length && this.doesMenu() && nodes[i].isDynamic ? (expanded ? 'minus' : 'plus') : 'branch';
 204                         var iconName = expanded && nodes[i].expandedIcon ? nodes[i].expandedIcon : nodes[i].icon;
 205                         var iconimg  = nodes[i].icon ? this.stringFormat('<img src="{0}/{1}" width="20" height="20" align="top" id="icon_{2}">', this.iconpath, iconName, layerID) : '';
 206
 207                         /**
 208                         * Add event handlers
 209                         */
 210                         var eventHandlers = "";
 211                         for (j in nodes[i].events) {
 212                                 eventHandlers += this.stringFormat('{0}="{1}" ', j, nodes[i].events[j]);
 213                         }
 214
 215                         /**
 216                 * Build the html to write to the document
 217                         * IMPORTANT:
 218                         * document.write()ing the string: '<div style="display:...' will screw up nn4.x
 219                 */
 220                         var layerTag  = this.doesMenu() ? this.stringFormat('<div id="{0}" style="display: {1}" class="{2}">', layerID, visibility, (nodes[i].cssClass ? nodes[i].cssClass : this.defaultClass)) : this.stringFormat('<div class="{0}">', nodes[i].cssClass ? nodes[i].cssClass : this.defaultClass);
 221                         var onMDown   = this.doesMenu() && nodes[i].n.length  && nodes[i].isDynamic ? this.stringFormat('onmousedown="{0}.toggleBranch(\'{1}\', true)" style="cursor: pointer; cursor: hand"', this.myname, layerID) : '';
 222                         var imgTag    = this.stringFormat('<img src="{0}/{1}{2}.gif" width="20" height="20" align="top" border="0" name="img_{3}" {4}>', this.iconpath, gifname, modifier, layerID, onMDown);
 223                         var linkTarget= nodes[i].linkTarget ? nodes[i].linkTarget : this.linkTarget;
 224                         var linkStart = nodes[i].link ? this.stringFormat('<a href="{0}" target="{1}">', nodes[i].link, linkTarget) : '';
 225
 226                         var delLink       = nodes[i].link.replace('add_node','delete_node');
 227                         var linkEnd   = nodes[i].link ? '</a>&nbsp;&nbsp;&nbsp;<a href="' + delLink  + 'process=1" style="text-decoration:none;"><span style="color:red; font-size:70%; font-family: sans-serif;">(' + deleteLabel + ')</span></a>' : '';
 228
 229                         this.output += this.stringFormat('{0}<nobr>{1}{2}{3}{4}<span {5}>{6}</span>{7}</nobr><br></div>',
 230                                           layerTag,
 231                                                           prepend,
 232                                           parentLayerID == null && (nodes.length == 1 || this.noTopLevelImages) ? '' : imgTag,
 233                                                           iconimg,
 234                                                           linkStart,
 235                                                           eventHandlers,
 236                                                           nodes[i].title,
 237                                                           linkEnd);
 238
 239                         /**
 240                 * Traverse sub nodes ?
 241                 */
 242                         if (nodes[i].n.length) {
 243                                 /**
 244                     * Determine what to prepend. If there is only one root
 245                                 * node then the prepend to pass to children is nothing.
 246                                 * Otherwise it depends on where we are in the tree.
 247                     */
 248                                 if (parentLayerID == null && (nodes.length == 1 || this.noTopLevelImages)) {
 249                                         var newPrepend = '';
 250
 251                                 } else if (i < (nodes.length - 1)) {
 252                                         var newPrepend = prepend + this.stringFormat('<img src="{0}/line.gif" width="20" height="20" align="top">', this.iconpath);
 253
 254                                 } else {
 255                                         var newPrepend = prepend + this.stringFormat('<img src="{0}/linebottom.gif" width="20" height="20" align="top">', this.iconpath);
 256                                 }
 257
 258                                 this.drawMenu(nodes[i].n,
 259                                               arrayCopy(level),
 260                                               newPrepend,
 261                                               nodes[i].expanded,
 262                                               expanded ? 'inline' : 'none',
 263                                               layerID);
 264                         }
 265                 }
 266         }
 267
 268 /**
 269 * Writes the output generated by drawMenu() to the page
 270 */
 271         TreeMenu.prototype.writeOutput = function ()
 272         {
 273                 document.write(this.output);
 274         }
 275
 276 /**
 277 * Toggles a branches visible status. Called from resetBranches()
 278 * and also when a +/- graphic is clicked.
 279 */
 280         TreeMenu.prototype.toggleBranch = function (layerID, updateStatus) // OPTIONAL ARGS: fireEvents = true
 281         {
 282                 var currentDisplay = this.getLayer(layerID).style.display;
 283                 var newDisplay     = (this.branchStatus[layerID] && currentDisplay == 'inline') ? 'none' : 'inline';
 284                 var fireEvents     = arguments[2] != null ? arguments[2] : true;
 285
 286                 for (var i=0; i<this.layerRelations[layerID].length; i++) {
 287
 288                         if (this.branchStatus[this.layerRelations[layerID][i]]) {
 289                                 this.toggleBranch(this.layerRelations[layerID][i], false);
 290                         }
 291
 292                         this.getLayer(this.layerRelations[layerID][i]).style.display = newDisplay;
 293                 }
 294
 295                 if (updateStatus) {
 296                         this.branchStatus[layerID] = !this.branchStatus[layerID];
 297
 298                         /**
 299                 * Persistence
 300                 */
 301                         if (this.doesPersistence() && !arguments[2] && this.usePersistence) {
 302                                 this.setExpandedStatusForCookie(layerID, this.branchStatus[layerID]);
 303                         }
 304
 305                         /**
 306                         * Fire custom events
 307                         */
 308                         if (fireEvents) {
 309                                 nodeObject = this.nodeRefs[layerID];
 310
 311                                 if (nodeObject.ontoggle != null) {
 312                                         eval(nodeObject.ontoggle);
 313                                 }
 314
 315                                 if (newDisplay == 'none' && nodeObject.oncollapse != null) {
 316                                         eval(nodeObject.oncollapse);
 317                                 } else if (newDisplay == 'inline' && nodeObject.onexpand != null){
 318                                         eval(nodeObject.onexpand);
 319                                 }
 320                         }
 321
 322                         // Swap image
 323                         this.swapImage(layerID);
 324                 }
 325
 326                 // Swap icon
 327                 this.swapIcon(layerID);
 328         }
 329
 330 /**
 331 * Swaps the plus/minus branch images
 332 */
 333         TreeMenu.prototype.swapImage = function (layerID)
 334         {
 335                 var imgSrc = document.images['img_' + layerID].src;
 336
 337                 var re = /^(.*)(plus|minus)(bottom|top|single)?.gif$/
 338                 if (matches = imgSrc.match(re)) {
 339
 340                         document.images['img_' + layerID].src = this.stringFormat('{0}{1}{2}{3}',
 341                                                                         matches[1],
 342                                                                                                                         matches[2] == 'plus' ? 'minus' : 'plus',
 343                                                                                                                         matches[3] ? matches[3] : '',
 344                                                                                                                         '.gif');
 345                 }
 346         }
 347
 348 /**
 349 * Swaps the icon for the expanded icon if one
 350 * has been supplied.
 351 */
 352         TreeMenu.prototype.swapIcon = function (layerID)
 353         {
 354                 if (document.images['icon_' + layerID]) {
 355                         var imgSrc = document.images['icon_' + layerID].src;
 356
 357                         if (this.nodeRefs[layerID].icon && this.nodeRefs[layerID].expandedIcon) {
 358                                 var newSrc = (imgSrc.indexOf(this.nodeRefs[layerID].expandedIcon) == -1 ? this.nodeRefs[layerID].expandedIcon : this.nodeRefs[layerID].icon);
 359
 360                                 document.images['icon_' + layerID].src = this.iconpath + '/' + newSrc;
 361                         }
 362                 }
 363         }
 364
 365 /**
 366 * Can the browser handle the dynamic menu?
 367 */
 368         TreeMenu.prototype.doesMenu = function ()
 369         {
 370                 return (is_ie4up || is_nav6up || is_gecko || is_opera7);
 371         }
 372
 373 /**
 374 * Can the browser handle save the branch status
 375 */
 376         TreeMenu.prototype.doesPersistence = function ()
 377         {
 378                 return (is_ie4up || is_gecko || is_nav6up || is_opera7);
 379         }
 380
 381 /**
 382 * Returns the appropriate layer accessor
 383 */
 384         TreeMenu.prototype.getLayer = function (layerID)
 385         {
 386                 if (is_ie4) {
 387                         return document.all(layerID);
 388
 389                 } else if (document.getElementById(layerID)) {
 390                         return document.getElementById(layerID);
 391
 392                 } else if (document.all(layerID)) {
 393                         return document.all(layerID);
 394                 }
 395         }
 396
 397 /**
 398 * Save the status of the layer
 399 */
 400         TreeMenu.prototype.setExpandedStatusForCookie = function (layerID, expanded)
 401         {
 402                 this.cookieStatuses[layerID] = expanded;
 403                 this.saveCookie();
 404         }
 405
 406 /**
 407 * Load the status of the layer
 408 */
 409         TreeMenu.prototype.getExpandedStatusFromCookie = function (layerID)
 410         {
 411                 if (this.cookieStatuses[layerID]) {
 412                         return this.cookieStatuses[layerID];
 413                 }
 414
 415                 return false;
 416         }
 417
 418 /**
 419 * Saves the cookie that holds which branches are expanded.
 420 * Only saves the details of the branches which are expanded.
 421 */
 422         TreeMenu.prototype.saveCookie = function ()
 423         {
 424                 var cookieString = new Array();
 425
 426                 for (var i in this.cookieStatuses) {
 427                         if (this.cookieStatuses[i] == true) {
 428                                 cookieString[cookieString.length] = i;
 429                         }
 430                 }
 431
 432                 document.cookie = 'TreeMenuBranchStatus=' + cookieString.join(':');
 433         }
 434
 435 /**
 436 * Reads cookie parses it for status info and
 437 * stores that info in the class member.
 438 */
 439         TreeMenu.prototype.loadCookie = function ()
 440         {
 441                 var cookie = document.cookie.split('; ');
 442
 443                 for (var i=0; i < cookie.length; i++) {
 444                         var crumb = cookie[i].split('=');
 445                         if ('TreeMenuBranchStatus' == crumb[0] && crumb[1]) {
 446                                 var expandedBranches = crumb[1].split(':');
 447                                 for (var j=0; j<expandedBranches.length; j++) {
 448                                         this.cookieStatuses[expandedBranches[j]] = true;
 449                                 }
 450                         }
 451                 }
 452         }
 453
 454 /**
 455 * Reset branch status
 456 */
 457         TreeMenu.prototype.resetBranches = function ()
 458         {
 459                 if (!this.doesPersistence()) {
 460                         return false;
 461                 }
 462
 463                 this.loadCookie();
 464
 465                 for (var i=0; i<this.branches.length; i++) {
 466                         var status = this.getExpandedStatusFromCookie(this.branches[i]);
 467                         // Only update if it's supposed to be expanded and it's not already
 468                         if (status == true && this.branchStatus[this.branches[i]] != true) {
 469                                 if (this.checkParentVisibility(this.branches[i])) {
 470                                         this.toggleBranch(this.branches[i], true, false);
 471                                 } else {
 472                                         this.branchStatus[this.branches[i]] = true;
 473                                         this.swapImage(this.branches[i]);
 474                                 }
 475                         }
 476                 }
 477         }
 478
 479 /**
 480 * Checks whether a branch should be open
 481 * or not based on its parents' status
 482 */
 483         TreeMenu.prototype.checkParentVisibility = function (layerID)
 484         {
 485                 if (this.in_array(this.childParents[layerID], this.branches)
 486                     && this.branchStatus[this.childParents[layerID]]
 487                         && this.checkParentVisibility(this.childParents[layerID]) ) {
 488
 489                         return true;
 490
 491                 } else if (this.childParents[layerID] == null) {
 492                         return true;
 493                 }
 494
 495                 return false;
 496         }
 497
 498 /**
 499 * New C# style string formatter
 500 */
 501         TreeMenu.prototype.stringFormat = function (strInput)
 502         {
 503                 var idx = 0;
 504
 505                 for (var i=1; i<arguments.length; i++) {
 506                         while ((idx = strInput.indexOf('{' + (i - 1) + '}', idx)) != -1) {
 507                                 strInput = strInput.substring(0, idx) + arguments[i] + strInput.substr(idx + 3);
 508                         }
 509                 }
 510
 511                 return strInput;
 512         }
 513
 514 /**
 515 * Also much adored, the PHP implode() function
 516 */
 517         TreeMenu.prototype.implode = function (seperator, input)
 518         {
 519                 var output = '';
 520
 521                 for (var i=0; i<input.length; i++) {
 522                         if (i == 0) {
 523                                 output += input[i];
 524                         } else {
 525                                 output += seperator + input[i];
 526                         }
 527                 }
 528
 529                 return output;
 530         }
 531
 532 /**
 533 * Aah, all the old favourites are coming out...
 534 */
 535         TreeMenu.prototype.in_array = function (item, arr)
 536         {
 537                 for (var i=0; i<arr.length; i++) {
 538                         if (arr[i] == item) {
 539                                 return true;
 540                         }
 541                 }
 542
 543                 return false;
 544         }
 545
 546 /**
 547 * TreeNode Class
 548 */
 549         function TreeNode(title, icon, link, expanded, isDynamic, cssClass, linkTarget, expandedIcon)
 550         {
 551                 this.title        = title;
 552                 this.icon         = icon;
 553                 this.expandedIcon = expandedIcon;
 554                 this.link         = link;
 555                 this.expanded     = expanded;
 556                 this.isDynamic    = isDynamic;
 557                 this.cssClass     = cssClass;
 558                 this.linkTarget   = linkTarget;
 559                 this.n            = new Array();
 560                 this.events       = new Array();
 561                 this.handlers     = null;
 562                 this.oncollapse   = null;
 563                 this.onexpand     = null;
 564                 this.ontoggle     = null;
 565         }
 566
 567 /**
 568 * Adds a node to an already existing node
 569 */
 570         TreeNode.prototype.addItem = function (newNode)
 571         {
 572                 newIndex = this.n.length;
 573                 this.n[newIndex] = newNode;
 574
 575                 return this.n[newIndex];
 576         }
 577
 578 /**
 579 * Sets an event for this particular node
 580 */
 581         TreeNode.prototype.setEvent = function (eventName, eventHandler)
 582         {
 583                 switch (eventName.toLowerCase()) {
 584                         case 'onexpand':
 585                                 this.onexpand = eventHandler;
 586                                 break;
 587
 588                         case 'oncollapse':
 589                                 this.oncollapse = eventHandler;
 590                                 break;
 591
 592                         case 'ontoggle':
 593                                 this.ontoggle = eventHandler;
 594                                 break;
 595
 596                         default:
 597                                 this.events[eventName] = eventHandler;
 598                 }
 599         }
 600
 601 /**
 602 * That's the end of the tree classes. What follows is
 603 * the browser detection code.
 604 */
 605
 606
 607 //<!--
 608 // Ultimate client-side JavaScript client sniff. Version 3.03
 609 // (C) Netscape Communications 1999-2001.  Permission granted to reuse and distribute.
 610 // Revised 17 May 99 to add is_nav5up and is_ie5up (see below).
 611 // Revised 20 Dec 00 to add is_gecko and change is_nav5up to is_nav6up
 612 //                      also added support for IE5.5 Opera4&5 HotJava3 AOLTV
 613 // Revised 22 Feb 01 to correct Javascript Detection for IE 5.x, Opera 4,
 614 //                      correct Opera 5 detection
 615 //                      add support for winME and win2k
 616 //                      synch with browser-type-oo.js
 617 // Revised 26 Mar 01 to correct Opera detection
 618 // Revised 02 Oct 01 to add IE6 detection
 619
 620 // Everything you always wanted to know about your JavaScript client
 621 // but were afraid to ask. Creates "is_" variables indicating:
 622 // (1) browser vendor:
 623 //     is_nav, is_ie, is_opera, is_hotjava, is_webtv, is_TVNavigator, is_AOLTV
 624 // (2) browser version number:
 625 //     is_major (integer indicating major version number: 2, 3, 4 ...)
 626 //     is_minor (float   indicating full  version number: 2.02, 3.01, 4.04 ...)
 627 // (3) browser vendor AND major version number
 628 //     is_nav2, is_nav3, is_nav4, is_nav4up, is_nav6, is_nav6up, is_gecko, is_ie3,
 629 //     is_ie4, is_ie4up, is_ie5, is_ie5up, is_ie5_5, is_ie5_5up, is_ie6, is_ie6up, is_hotjava3, is_hotjava3up,
 630 //     is_opera2, is_opera3, is_opera4, is_opera5, is_opera5up
 631 // (4) JavaScript version number:
 632 //     is_js (float indicating full JavaScript version number: 1, 1.1, 1.2 ...)
 633 // (5) OS platform and version:
 634 //     is_win, is_win16, is_win32, is_win31, is_win95, is_winnt, is_win98, is_winme, is_win2k
 635 //     is_os2
 636 //     is_mac, is_mac68k, is_macppc
 637 //     is_unix
 638 //     is_sun, is_sun4, is_sun5, is_suni86
 639 //     is_irix, is_irix5, is_irix6
 640 //     is_hpux, is_hpux9, is_hpux10
 641 //     is_aix, is_aix1, is_aix2, is_aix3, is_aix4
 642 //     is_linux, is_sco, is_unixware, is_mpras, is_reliant
 643 //     is_dec, is_sinix, is_freebsd, is_bsd
 644 //     is_vms
 645 //
 646 // See http://www.it97.de/JavaScript/JS_tutorial/bstat/navobj.html and
 647 // http://www.it97.de/JavaScript/JS_tutorial/bstat/Browseraol.html
 648 // for detailed lists of userAgent strings.
 649 //
 650 // Note: you don't want your Nav4 or IE4 code to "turn off" or
 651 // stop working when new versions of browsers are released, so
 652 // in conditional code forks, use is_ie5up ("IE 5.0 or greater")
 653 // is_opera5up ("Opera 5.0 or greater") instead of is_ie5 or is_opera5
 654 // to check version in code which you want to work on future
 655 // versions.
 656
 657 /**
 658 * Severly curtailed all this as only certain elements
 659 * are required by TreeMenu, specifically:
 660 *  o is_ie4up
 661 *  o is_nav6up
 662 *  o is_gecko
 663 */
 664
 665     // convert all characters to lowercase to simplify testing
 666     var agt=navigator.userAgent.toLowerCase();
 667
 668     // *** BROWSER VERSION ***
 669     // Note: On IE5, these return 4, so use is_ie5up to detect IE5.
 670     var is_major = parseInt(navigator.appVersion);
 671     var is_minor = parseFloat(navigator.appVersion);
 672
 673     // Note: Opera and WebTV spoof Navigator.  We do strict client detection.
 674     // If you want to allow spoofing, take out the tests for opera and webtv.
 675     var is_nav  = ((agt.indexOf('mozilla')!=-1) && (agt.indexOf('spoofer')==-1)
 676                 && (agt.indexOf('compatible') == -1) && (agt.indexOf('opera')==-1)
 677                 && (agt.indexOf('webtv')==-1) && (agt.indexOf('hotjava')==-1));
 678     var is_nav6up = (is_nav && (is_major >= 5));
 679     var is_gecko = (agt.indexOf('gecko') != -1);
 680
 681
 682     var is_ie     = ((agt.indexOf("msie") != -1) && (agt.indexOf("opera") == -1));
 683     var is_ie4    = (is_ie && (is_major == 4) && (agt.indexOf("msie 4")!=-1) );
 684     var is_ie4up  = (is_ie && (is_major >= 4));
 685
 686         var is_opera  = (agt.indexOf("opera") != -1);
 687         var is_opera7 = is_opera && (agt.indexOf("opera 7") != -1);
 688
 689         // Patch from Harald Fielker
 690     if (agt.indexOf('konqueror') != -1) {
 691         var is_nav    = false;
 692         var is_nav6up = false;
 693         var is_gecko  = false;
 694         var is_ie     = true;
 695         var is_ie4    = true;
 696         var is_ie4up  = true;
 697     }
 698 //--> end hide JavaScript