default_blocks/tree_block_script.js

   1 // (c) Benoît PIN 2006
   2 // http://plinn.org
   3 // Licence GPL
   4
   5 var TreeMaker;
   6
   7 (function() {
   8 /* root -> base node (typically a tbody or a table)
   9 *  filter -> comma separated list of portal_types
  10 */
  11 TreeMaker = function (root, filter, baseImgUrl) {
  12         this.root = root;
  13         var tm = this;
  14         this.root.onclick = function(evt) { tm.refreshTree(evt); };
  15         this.filter = filter;
  16         this.baseImgUrl = baseImgUrl;
  17         this.depthCpt = new Array();
  18         this._lastAniImg = null;
  19
  20         // preload images
  21         var images = ['pl.gif', 'pl_ani.gif', 'mi.gif', 'mi_ani.gif'], img;
  22         for (var i=0 ; i < images.length ; i++) {
  23                 img = new Image();
  24                 img.src = this.baseImgUrl + images[i];
  25         }
  26 }
  27
  28 /*
  29 * expand / collapse handler
  30 * object loading trigger
  31 */
  32 TreeMaker.prototype.refreshTree = function (evt) {
  33         var target = getTargetedObject(evt);
  34         if (target.blur)
  35                 target.blur();
  36
  37         if (target.tagName == 'IMG') {
  38                 target.parentNode.blur();
  39                 var srcParts = target.src.split("/");
  40                 var imgId = srcParts[srcParts.length-1];
  41                 var parentTd = target.parentNode.parentNode;
  42                 var parentRow = parentTd.parentNode;
  43
  44
  45                 switch (imgId) {
  46                         case "pl.gif" :
  47                         case "pl_ani.gif" :
  48                                 var linkCell = parentTd.nextSibling;
  49                                 while (linkCell.nodeType != 1)
  50                                         linkCell = linkCell.nextSibling;
  51
  52                                 var obUrl = linkCell.getElementsByTagName("A")[0].href;
  53
  54                                 var req = new XMLHttpRequest();
  55                                 var tm = this;
  56                                 req.onreadystatechange = function() {
  57                                         switch (req.readyState) {
  58                                                 case 1:
  59                                                         showProgressImage();
  60                                                         break;
  61                                                 case 4:
  62                                                         hideProgressImage();
  63                                                         tm.importRows(req, parentRow);
  64                                         };
  65                                 };
  66                                 target.src = this.baseImgUrl + "mi_ani.gif";
  67                                 this._lastAniImg = target;
  68                                 window.setTimeout(function(){tm._removeLastAniImg();}, 500);
  69
  70                                 req.open("POST", obUrl + "/xml_nav_tree", true);
  71                                 req.setRequestHeader("Content-Type", "application/x-www-form-urlencoded;charset=utf-8");
  72                                 req.send("filter=" + encodeURIComponent(this.filter) +
  73                                                  "&root_name=" + encodeURIComponent(this.root.id) +
  74                                                  "&expansion=" + encodeURIComponent(this.getExpansion()));
  75
  76                                 break;
  77
  78                         case "mi.gif" :
  79                         case "mi_ani.gif" :
  80                                 this.removeChildNodes(parentRow);
  81                                 target.src = this.baseImgUrl + "pl_ani.gif";
  82                                 this._lastAniImg = target;
  83                                 var tm = this;
  84                                 window.setTimeout(function(){tm._removeLastAniImg();}, 500);
  85                                 document.cookie = encodeURIComponent(this.root.id) + '-state=' + encodeURIComponent(this.getExpansion()) +
  86                                                                   ';path=/';
  87                                 break;
  88                 } // end switch (imgId)
  89                 disableDefault(evt);
  90                 disablePropagation(evt);
  91         }
  92 };
  93
  94
  95 TreeMaker.prototype._removeLastAniImg = function() {
  96         if (this._lastAniImg) {
  97                 this._lastAniImg.src = this._lastAniImg.src.replace("_ani", "");
  98         }
  99 };
 100
 101 TreeMaker.prototype.getExpansion = function() {
 102         var rows = this.root.getElementsByTagName('TR');
 103         var row, cells, stateCell, button, expid, node_depth, last_depth = -1, dd, step;
 104         var steps = new Array();
 105         steps.push(this.root.getAttribute('name'));
 106
 107         var expanded = (/.*mi\.gif$|.*mi_ani\.gif$/);
 108         for(i=0 ; i < rows.length ; i++) {
 109                 row = rows[i];
 110                 cells = row.getElementsByTagName('TD');
 111                 stateCell = cells[cells.length-2]; // cell where the +/- button is
 112                 button = stateCell.getElementsByTagName('IMG');
 113                 if (! button.length)
 114                         continue;
 115                 button = button[0];
 116                 if (expanded.test(button.src)) {
 117                         expid = button.parentNode.getAttribute("name");
 118                         node_depth = cells[0].getAttribute('colspan') || 0;
 119                         dd = last_depth - node_depth + 1;
 120                         last_depth = node_depth;
 121                         if (dd > 0) {
 122                                 step = '';
 123                                 for (var j = 0 ;  j < dd ; j++)
 124                                         step = step + '_';
 125                                 steps.push(step);
 126                         }
 127                         steps.push(expid);
 128                 }
 129         }
 130         return steps.join(':');
 131 };
 132
 133
 134 /*
 135 * expand the tree: sends request and imports rows based on xml response.
 136 */
 137 TreeMaker.prototype.importRows = function(req, parentRow) {
 138         var rows = req.responseXML.documentElement.getElementsByTagName("row");
 139         var clickedCells = parentRow.getElementsByTagName("TD");
 140         var row, newRow, indentCell, stateCell, linkCell, img, a, indentValue, colspan,
 141                 incTableDepth=false, cols, linkCellColSpan;
 142
 143         for (var i = 0 ; i < rows.length ; i++ ) {
 144                 row = rows[i];
 145
 146
 147                 newRow = document.createElement("TR");
 148                 indentCell = document.createElement("TD");
 149                 stateCell = document.createElement("TD");
 150                 stateCell.width = "16";
 151                 linkCell = document.createElement("TD");
 152                 linkCell.width = "99%";
 153
 154
 155                 if (clickedCells.length == 3) {
 156                         indentValue = parseInt(clickedCells[0].getAttribute("colspan"));
 157                         colspan = parseInt(clickedCells[2].getAttribute("colspan"));
 158                 }
 159                 else {
 160                         indentValue = 0;
 161                         colspan = parseInt(clickedCells[1].getAttribute("colspan"));
 162                 }
 163
 164                 cols = indentValue + colspan;
 165
 166                 if (colspan == 1)
 167                 incTableDepth = true;
 168
 169         indentCell.colSpan =   indentValue + 1;
 170         if (!this.depthCpt[indentValue])
 171                 this.depthCpt[indentValue] = 1;
 172         else
 173                 this.depthCpt[indentValue] += 1;
 174
 175         // IE : it's not possible to set colSpan attr to 0 :-(((
 176         linkCellColSpan = cols - indentValue - 1
 177         if (linkCellColSpan == 0)
 178                 linkCell.nullColSpan = true;
 179             else
 180                 linkCell.colSpan = linkCellColSpan;
 181
 182                 img = document.createElement("IMG");
 183                 img.src = row.getAttribute("icon");
 184                 img.height = row.getAttribute("height");
 185                 img.width = row.getAttribute("width");
 186                 a = document.createElement("A");
 187
 188                 a.setAttribute("href", row.getAttribute("url"));
 189                 a.setAttribute("title", row.getAttribute("description"));
 190                 a.innerHTML = row.childNodes[0].nodeValue;
 191
 192                 if (row.getAttribute("state") == "-1") {
 193                         var stateLink = document.createElement("A");
 194                         stateLink.href = ".";
 195                         stateLink.setAttribute("name", row.getAttribute("name"));
 196                         var stateImg = document.createElement("IMG");
 197                         stateImg.src = this.baseImgUrl + "pl.gif";
 198                         stateImg.border = "0";
 199                         stateImg.height = "16";
 200                         stateImg.width = "16";
 201                         stateLink.appendChild(stateImg)
 202                         stateCell.appendChild(stateLink);
 203                 }
 204                 else
 205                         stateCell.innerHTML = "&nbsp;&nbsp;";
 206
 207                 linkCell.appendChild(img);
 208                 linkCell.appendChild(a);
 209                 newRow.appendChild(indentCell);
 210                 newRow.appendChild(stateCell);
 211                 newRow.appendChild(linkCell);
 212
 213
 214                 this.root.insertBefore(newRow, parentRow.nextSibling);
 215         } //end for
 216
 217         if (incTableDepth) {
 218                 var rows = this.root.getElementsByTagName("TR");
 219                 var cells, lastCell, lastColspan;
 220                 for (var i = 0 ; i < rows.length ; i++) {
 221                         cells = rows[i].getElementsByTagName("TD");
 222                         lastCell = cells[cells.length - 1];
 223
 224                         if (lastCell.nullColSpan) {
 225                                 lastCell.nullColSpan = false;
 226                                 lastColspan = 0;
 227                         }
 228                         else
 229                                 lastColspan = parseInt(lastCell.getAttribute("colspan"));
 230
 231                         lastCell.colSpan = lastColspan + 1;
 232                 }
 233         }
 234 };
 235
 236 /*
 237 * collapse the tree: removes deeper rows after the 'baseRow' passed.
 238 */
 239 TreeMaker.prototype.removeChildNodes = function(baseRow) {
 240         var baseCells = baseRow.getElementsByTagName("TD");
 241         var baseColSpan = baseCells[baseCells.length-1].colSpan;
 242         var nextRow = baseRow.nextSibling;
 243         var tbody = baseRow.parentNode;
 244         var depthCpt = this.depthCpt;
 245         var nextCells, nextRow2;
 246
 247         while (nextRow) {
 248                 if (nextRow.nodeType == 1) {
 249                         nextCells = nextRow.getElementsByTagName("TD");
 250                         if (nextCells.length == 3 && nextCells[2].colSpan < baseColSpan) {
 251                                 nextRow2 = nextRow.nextSibling;
 252                                 depthCpt[nextCells[0].colSpan-1] -= 1;
 253                                 tbody.removeChild(nextRow);
 254                                 nextRow = nextRow2;
 255                                 continue;
 256                         }
 257                         break;
 258                 }
 259                 nextRow = nextRow.nextSibling; // text node
 260         }
 261
 262         // recalc colspans for Safari
 263         var maxDepth = depthCpt.length - 1;
 264         var depthReduction = 0;
 265         while (depthCpt[maxDepth - depthReduction] == 0) {
 266                 depthCpt.pop();
 267                 depthReduction++;
 268         }
 269
 270         if (depthReduction) {
 271                 var rows = tbody.getElementsByTagName("TR");
 272                 var cells, lastCell, lastColspan;
 273                 for (var i = 0 ; i < rows.length ; i++) {
 274                         cells = rows[i].getElementsByTagName("TD");
 275                         lastCell = cells[cells.length - 1];
 276                         lastCell.colSpan = parseInt(lastCell.colSpan) - depthReduction;
 277                 }
 278         }
 279 };
 280 })();