html/TreeMenu.js

   1 // +-----------------------------------------------------------------------+
   2 // | Copyright (c) 2002-2005, Richard Heyes, Harald Radi                   |
   3 // | All rights reserved.                                                  |
   4 // |                                                                       |
   5 // | Redistribution and use in source and binary forms, with or without    |
   6 // | modification, are permitted provided that the following conditions    |
   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: TreeMenu.js,v 1.21 2005/03/02 02:39:26 richard Exp $
  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 linkEnd   = nodes[i].link ? '</a>' : '';
 227
 228                         this.output += this.stringFormat('{0}<nobr>{1}{2}{3}{4}<span {5}>{6}</span>{7}</nobr><br></div>',
 229                                           layerTag,
 230                                                           prepend,
 231                                           parentLayerID == null && (nodes.length == 1 || this.noTopLevelImages) ? '' : imgTag,
 232                                                           iconimg,
 233                                                           linkStart,
 234                                                           eventHandlers,
 235                                                           nodes[i].title,
 236                                                           linkEnd);
 237
 238                         /**
 239                 * Traverse sub nodes ?
 240                 */
 241                         if (nodes[i].n.length) {
 242                                 /**
 243                     * Determine what to prepend. If there is only one root
 244                                 * node then the prepend to pass to children is nothing.
 245                                 * Otherwise it depends on where we are in the tree.
 246                     */
 247                                 if (parentLayerID == null && (nodes.length == 1 || this.noTopLevelImages)) {
 248                                         var newPrepend = '';
 249
 250                                 } else if (i < (nodes.length - 1)) {
 251                                         var newPrepend = prepend + this.stringFormat('<img src="{0}/line.gif" width="20" height="20" align="top">', this.iconpath);
 252
 253                                 } else {
 254                                         var newPrepend = prepend + this.stringFormat('<img src="{0}/linebottom.gif" width="20" height="20" align="top">', this.iconpath);
 255                                 }
 256
 257                                 this.drawMenu(nodes[i].n,
 258                                               arrayCopy(level),
 259                                               newPrepend,
 260                                               nodes[i].expanded,
 261                                               expanded ? 'inline' : 'none',
 262                                               layerID);
 263                         }
 264                 }
 265         }
 266
 267 /**
 268 * Writes the output generated by drawMenu() to the page
 269 */
 270         TreeMenu.prototype.writeOutput = function ()
 271         {
 272                 document.write(this.output);
 273         }
 274
 275 /**
 276 * Toggles a branches visible status. Called from resetBranches()
 277 * and also when a +/- graphic is clicked.
 278 */
 279         TreeMenu.prototype.toggleBranch = function (layerID, updateStatus) // OPTIONAL ARGS: fireEvents = true
 280         {
 281                 var currentDisplay = this.getLayer(layerID).style.display;
 282                 var newDisplay     = (this.branchStatus[layerID] && currentDisplay == 'inline') ? 'none' : 'inline';
 283                 var fireEvents     = arguments[2] != null ? arguments[2] : true;
 284
 285                 for (var i=0; i<this.layerRelations[layerID].length; i++) {
 286
 287                         if (this.branchStatus[this.layerRelations[layerID][i]]) {
 288                                 this.toggleBranch(this.layerRelations[layerID][i], false);
 289                         }
 290
 291                         this.getLayer(this.layerRelations[layerID][i]).style.display = newDisplay;
 292                 }
 293
 294                 if (updateStatus) {
 295                         this.branchStatus[layerID] = !this.branchStatus[layerID];
 296
 297                         /**
 298                 * Persistence
 299                 */
 300                         if (this.doesPersistence() && !arguments[2] && this.usePersistence) {
 301                                 this.setExpandedStatusForCookie(layerID, this.branchStatus[layerID]);
 302                         }
 303
 304                         /**
 305                         * Fire custom events
 306                         */
 307                         if (fireEvents) {
 308                                 nodeObject = this.nodeRefs[layerID];
 309
 310                                 if (nodeObject.ontoggle != null) {
 311                                         eval(nodeObject.ontoggle);
 312                                 }
 313
 314                                 if (newDisplay == 'none' && nodeObject.oncollapse != null) {
 315                                         eval(nodeObject.oncollapse);
 316                                 } else if (newDisplay == 'inline' && nodeObject.onexpand != null){
 317                                         eval(nodeObject.onexpand);
 318                                 }
 319                         }
 320
 321                         // Swap image
 322                         this.swapImage(layerID);
 323                 }
 324
 325                 // Swap icon
 326                 this.swapIcon(layerID);
 327         }
 328
 329 /**
 330 * Swaps the plus/minus branch images
 331 */
 332         TreeMenu.prototype.swapImage = function (layerID)
 333         {
 334                 var imgSrc = document.images['img_' + layerID].src;
 335
 336                 var re = /^(.*)(plus|minus)(bottom|top|single)?.gif$/
 337                 if (matches = imgSrc.match(re)) {
 338
 339                         document.images['img_' + layerID].src = this.stringFormat('{0}{1}{2}{3}',
 340                                                                         matches[1],
 341                                                                                                                         matches[2] == 'plus' ? 'minus' : 'plus',
 342                                                                                                                         matches[3] ? matches[3] : '',
 343                                                                                                                         '.gif');
 344                 }
 345         }
 346
 347 /**
 348 * Swaps the icon for the expanded icon if one
 349 * has been supplied.
 350 */
 351         TreeMenu.prototype.swapIcon = function (layerID)
 352         {
 353                 if (document.images['icon_' + layerID]) {
 354                         var imgSrc = document.images['icon_' + layerID].src;
 355
 356                         if (this.nodeRefs[layerID].icon && this.nodeRefs[layerID].expandedIcon) {
 357                                 var newSrc = (imgSrc.indexOf(this.nodeRefs[layerID].expandedIcon) == -1 ? this.nodeRefs[layerID].expandedIcon : this.nodeRefs[layerID].icon);
 358
 359                                 document.images['icon_' + layerID].src = this.iconpath + '/' + newSrc;
 360                         }
 361                 }
 362         }
 363
 364 /**
 365 * Can the browser handle the dynamic menu?
 366 */
 367         TreeMenu.prototype.doesMenu = function ()
 368         {
 369                 return (is_ie4up || is_nav6up || is_gecko || is_opera7);
 370         }
 371
 372 /**
 373 * Can the browser handle save the branch status
 374 */
 375         TreeMenu.prototype.doesPersistence = function ()
 376         {
 377                 return (is_ie4up || is_gecko || is_nav6up || is_opera7);
 378         }
 379
 380 /**
 381 * Returns the appropriate layer accessor
 382 */
 383         TreeMenu.prototype.getLayer = function (layerID)
 384         {
 385                 if (is_ie4) {
 386                         return document.all(layerID);
 387
 388                 } else if (document.getElementById(layerID)) {
 389                         return document.getElementById(layerID);
 390
 391                 } else if (document.all && document.all(layerID)) {
 392                         return document.all(layerID);
 393                 }
 394         }
 395
 396 /**
 397 * Save the status of the layer
 398 */
 399         TreeMenu.prototype.setExpandedStatusForCookie = function (layerID, expanded)
 400         {
 401                 this.cookieStatuses[layerID] = expanded;
 402                 this.saveCookie();
 403         }
 404
 405 /**
 406 * Load the status of the layer
 407 */
 408         TreeMenu.prototype.getExpandedStatusFromCookie = function (layerID)
 409         {
 410                 if (this.cookieStatuses[layerID]) {
 411                         return this.cookieStatuses[layerID];
 412                 }
 413
 414                 return false;
 415         }
 416
 417 /**
 418 * Saves the cookie that holds which branches are expanded.
 419 * Only saves the details of the branches which are expanded.
 420 */
 421         TreeMenu.prototype.saveCookie = function ()
 422         {
 423                 var cookieString = new Array();
 424
 425                 for (var i in this.cookieStatuses) {
 426                         if (this.cookieStatuses[i] == true) {
 427                                 cookieString[cookieString.length] = i;
 428                         }
 429                 }
 430
 431                 document.cookie = 'TreeMenuBranchStatus=' + cookieString.join(':');
 432         }
 433
 434 /**
 435 * Reads cookie parses it for status info and
 436 * stores that info in the class member.
 437 */
 438         TreeMenu.prototype.loadCookie = function ()
 439         {
 440                 var cookie = document.cookie.split('; ');
 441
 442                 for (var i=0; i < cookie.length; i++) {
 443                         var crumb = cookie[i].split('=');
 444                         if ('TreeMenuBranchStatus' == crumb[0] && crumb[1]) {
 445                                 var expandedBranches = crumb[1].split(':');
 446                                 for (var j=0; j<expandedBranches.length; j++) {
 447                                         this.cookieStatuses[expandedBranches[j]] = true;
 448                                 }
 449                         }
 450                 }
 451         }
 452
 453 /**
 454 * Reset branch status
 455 */
 456         TreeMenu.prototype.resetBranches = function ()
 457         {
 458                 if (!this.doesPersistence()) {
 459                         return false;
 460                 }
 461
 462                 this.loadCookie();
 463
 464                 for (var i=0; i<this.branches.length; i++) {
 465                         var status = this.getExpandedStatusFromCookie(this.branches[i]);
 466                         // Only update if it's supposed to be expanded and it's not already
 467                         if (status == true && this.branchStatus[this.branches[i]] != true) {
 468                                 if (this.checkParentVisibility(this.branches[i])) {
 469                                         this.toggleBranch(this.branches[i], true, false);
 470                                 } else {
 471                                         this.branchStatus[this.branches[i]] = true;
 472                                         this.swapImage(this.branches[i]);
 473                                 }
 474                         }
 475                 }
 476         }
 477
 478 /**
 479 * Checks whether a branch should be open
 480 * or not based on its parents' status
 481 */
 482         TreeMenu.prototype.checkParentVisibility = function (layerID)
 483         {
 484                 if (this.in_array(this.childParents[layerID], this.branches)
 485                     && this.branchStatus[this.childParents[layerID]]
 486                         && this.checkParentVisibility(this.childParents[layerID]) ) {
 487
 488                         return true;
 489
 490                 } else if (this.childParents[layerID] == null) {
 491                         return true;
 492                 }
 493
 494                 return false;
 495         }
 496
 497 /**
 498 * New C# style string formatter
 499 */
 500         TreeMenu.prototype.stringFormat = function (strInput)
 501         {
 502                 var idx = 0;
 503
 504                 for (var i=1; i<arguments.length; i++) {
 505                         while ((idx = strInput.indexOf('{' + (i - 1) + '}', idx)) != -1) {
 506                                 strInput = strInput.substring(0, idx) + arguments[i] + strInput.substr(idx + 3);
 507                         }
 508                 }
 509
 510                 return strInput;
 511         }
 512
 513 /**
 514 * Also much adored, the PHP implode() function
 515 */
 516         TreeMenu.prototype.implode = function (seperator, input)
 517         {
 518                 var output = '';
 519
 520                 for (var i=0; i<input.length; i++) {
 521                         if (i == 0) {
 522                                 output += input[i];
 523                         } else {
 524                                 output += seperator + input[i];
 525                         }
 526                 }
 527
 528                 return output;
 529         }
 530
 531 /**
 532 * Aah, all the old favourites are coming out...
 533 */
 534         TreeMenu.prototype.in_array = function (item, arr)
 535         {
 536                 for (var i=0; i<arr.length; i++) {
 537                         if (arr[i] == item) {
 538                                 return true;
 539                         }
 540                 }
 541
 542                 return false;
 543         }
 544
 545 /**
 546 * TreeNode Class
 547 */
 548         function TreeNode(title, icon, link, expanded, isDynamic, cssClass, linkTarget, expandedIcon)
 549         {
 550                 this.title        = title;
 551                 this.icon         = icon;
 552                 this.expandedIcon = expandedIcon;
 553                 this.link         = link;
 554                 this.expanded     = expanded;
 555                 this.isDynamic    = isDynamic;
 556                 this.cssClass     = cssClass;
 557                 this.linkTarget   = linkTarget;
 558                 this.n            = new Array();
 559                 this.events       = new Array();
 560                 this.handlers     = null;
 561                 this.oncollapse   = null;
 562                 this.onexpand     = null;
 563                 this.ontoggle     = null;
 564         }
 565
 566 /**
 567 * Adds a node to an already existing node
 568 */
 569         TreeNode.prototype.addItem = function (newNode)
 570         {
 571                 newIndex = this.n.length;
 572                 this.n[newIndex] = newNode;
 573
 574                 return this.n[newIndex];
 575         }
 576
 577 /**
 578 * Sets an event for this particular node
 579 */
 580         TreeNode.prototype.setEvent = function (eventName, eventHandler)
 581         {
 582                 switch (eventName.toLowerCase()) {
 583                         case 'onexpand':
 584                                 this.onexpand = eventHandler;
 585                                 break;
 586
 587                         case 'oncollapse':
 588                                 this.oncollapse = eventHandler;
 589                                 break;
 590
 591                         case 'ontoggle':
 592                                 this.ontoggle = eventHandler;
 593                                 break;
 594
 595                         default:
 596                                 this.events[eventName] = eventHandler;
 597                 }
 598         }
 599
 600 /**
 601 * That's the end of the tree classes. What follows is
 602 * the browser detection code.
 603 */
 604
 605
 606 //<!--
 607 // Ultimate client-side JavaScript client sniff. Version 3.03
 608 // (C) Netscape Communications 1999-2001.  Permission granted to reuse and distribute.
 609 // Revised 17 May 99 to add is_nav5up and is_ie5up (see below).
 610 // Revised 20 Dec 00 to add is_gecko and change is_nav5up to is_nav6up
 611 //                      also added support for IE5.5 Opera4&5 HotJava3 AOLTV
 612 // Revised 22 Feb 01 to correct Javascript Detection for IE 5.x, Opera 4,
 613 //                      correct Opera 5 detection
 614 //                      add support for winME and win2k
 615 //                      synch with browser-type-oo.js
 616 // Revised 26 Mar 01 to correct Opera detection
 617 // Revised 02 Oct 01 to add IE6 detection
 618
 619 // Everything you always wanted to know about your JavaScript client
 620 // but were afraid to ask. Creates "is_" variables indicating:
 621 // (1) browser vendor:
 622 //     is_nav, is_ie, is_opera, is_hotjava, is_webtv, is_TVNavigator, is_AOLTV
 623 // (2) browser version number:
 624 //     is_major (integer indicating major version number: 2, 3, 4 ...)
 625 //     is_minor (float   indicating full  version number: 2.02, 3.01, 4.04 ...)
 626 // (3) browser vendor AND major version number
 627 //     is_nav2, is_nav3, is_nav4, is_nav4up, is_nav6, is_nav6up, is_gecko, is_ie3,
 628 //     is_ie4, is_ie4up, is_ie5, is_ie5up, is_ie5_5, is_ie5_5up, is_ie6, is_ie6up, is_hotjava3, is_hotjava3up,
 629 //     is_opera2, is_opera3, is_opera4, is_opera5, is_opera5up
 630 // (4) JavaScript version number:
 631 //     is_js (float indicating full JavaScript version number: 1, 1.1, 1.2 ...)
 632 // (5) OS platform and version:
 633 //     is_win, is_win16, is_win32, is_win31, is_win95, is_winnt, is_win98, is_winme, is_win2k
 634 //     is_os2
 635 //     is_mac, is_mac68k, is_macppc
 636 //     is_unix
 637 //     is_sun, is_sun4, is_sun5, is_suni86
 638 //     is_irix, is_irix5, is_irix6
 639 //     is_hpux, is_hpux9, is_hpux10
 640 //     is_aix, is_aix1, is_aix2, is_aix3, is_aix4
 641 //     is_linux, is_sco, is_unixware, is_mpras, is_reliant
 642 //     is_dec, is_sinix, is_freebsd, is_bsd
 643 //     is_vms
 644 //
 645 // See http://www.it97.de/JavaScript/JS_tutorial/bstat/navobj.html and
 646 // http://www.it97.de/JavaScript/JS_tutorial/bstat/Browseraol.html
 647 // for detailed lists of userAgent strings.
 648 //
 649 // Note: you don't want your Nav4 or IE4 code to "turn off" or
 650 // stop working when new versions of browsers are released, so
 651 // in conditional code forks, use is_ie5up ("IE 5.0 or greater")
 652 // is_opera5up ("Opera 5.0 or greater") instead of is_ie5 or is_opera5
 653 // to check version in code which you want to work on future
 654 // versions.
 655
 656 /**
 657 * Severly curtailed all this as only certain elements
 658 * are required by TreeMenu, specifically:
 659 *  o is_ie4up
 660 *  o is_nav6up
 661 *  o is_gecko
 662 */
 663
 664     // convert all characters to lowercase to simplify testing
 665     var agt=navigator.userAgent.toLowerCase();
 666
 667     // *** BROWSER VERSION ***
 668     // Note: On IE5, these return 4, so use is_ie5up to detect IE5.
 669     var is_major = parseInt(navigator.appVersion);
 670     var is_minor = parseFloat(navigator.appVersion);
 671
 672     // Note: Opera and WebTV spoof Navigator.  We do strict client detection.
 673     // If you want to allow spoofing, take out the tests for opera and webtv.
 674     var is_nav  = ((agt.indexOf('mozilla')!=-1) && (agt.indexOf('spoofer')==-1)
 675                 && (agt.indexOf('compatible') == -1) && (agt.indexOf('opera')==-1)
 676                 && (agt.indexOf('webtv')==-1) && (agt.indexOf('hotjava')==-1));
 677     var is_nav6up = (is_nav && (is_major >= 5));
 678     var is_gecko = (agt.indexOf('gecko') != -1);
 679
 680
 681     var is_ie     = ((agt.indexOf("msie") != -1) && (agt.indexOf("opera") == -1));
 682     var is_ie4    = (is_ie && (is_major == 4) && (agt.indexOf("msie 4")!=-1) );
 683     var is_ie4up  = (is_ie && (is_major >= 4));
 684
 685         var is_opera  = (agt.indexOf("opera") != -1);
 686         var is_opera7 = (is_opera && is_major >= 7) || agt.indexOf("opera 7") != -1;
 687
 688         // Patch from Harald Fielker
 689     if (agt.indexOf('konqueror') != -1) {
 690         var is_nav    = false;
 691         var is_nav6up = false;
 692         var is_gecko  = false;
 693         var is_ie     = true;
 694         var is_ie4    = true;
 695         var is_ie4up  = true;
 696     }
 697 //--> end hide JavaScript