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                                 req.open("POST", obUrl + "/xml_nav_tree", true);
  67                                 req.setRequestHeader("Content-Type", "application/x-www-form-urlencoded;charset=utf-8");
  68                                 req.send("filter=" + this.filter);
  69
  70                                 target.src = this.baseImgUrl + "mi_ani.gif";
  71                                 this._lastAniImg = target;
  72
  73
  74                                 window.setTimeout(function(){tm._removeLastAniImg();}, 500);
  75                                 break;
  76
  77                         case "mi.gif" :
  78                         case "mi_ani.gif" :
  79                                 this.removeChildNodes(parentRow);
  80                                 target.src = this.baseImgUrl + "pl_ani.gif";
  81                                 this._lastAniImg = target;
  82                                 var tm = this;
  83                                 window.setTimeout(function(){tm._removeLastAniImg();}, 500);
  84                                 break;
  85                 } // end switch (imgId)
  86                 disableDefault(evt);
  87                 disablePropagation(evt);
  88         }
  89 };
  90
  91
  92 TreeMaker.prototype._removeLastAniImg = function() {
  93         if (this._lastAniImg) {
  94                 this._lastAniImg.src = this._lastAniImg.src.replace("_ani", "");
  95         }
  96 };
  97
  98
  99 /*
 100 * expand the tree: sends request and imports rows based on xml response.
 101 */
 102 TreeMaker.prototype.importRows = function(req, parentRow) {
 103         var rows = req.responseXML.documentElement.getElementsByTagName("row");
 104         var clickedCells = parentRow.getElementsByTagName("TD");
 105         var row, newRow, indentCell, stateCell, linkCell, img, a, indentValue, colspan,
 106                 incTableDepth=false, cols, linkCellColSpan;
 107
 108         for (var i = 0 ; i < rows.length ; i++ ) {
 109                 row = rows[i];
 110
 111
 112                 newRow = document.createElement("TR");
 113                 indentCell = document.createElement("TD");
 114                 stateCell = document.createElement("TD");
 115                 stateCell.width = "16";
 116                 linkCell = document.createElement("TD");
 117                 linkCell.width = "99%";
 118
 119
 120                 if (clickedCells.length == 3) {
 121                         indentValue = parseInt(clickedCells[0].getAttribute("colspan"));
 122                         colspan = parseInt(clickedCells[2].getAttribute("colspan"));
 123                 }
 124                 else {
 125                         indentValue = 0;
 126                         colspan = parseInt(clickedCells[1].getAttribute("colspan"));
 127                 }
 128
 129                 cols = indentValue + colspan;
 130
 131                 if (colspan == 1)
 132                 incTableDepth = true;
 133
 134         indentCell.colSpan =   indentValue + 1;
 135         if (!this.depthCpt[indentValue])
 136                 this.depthCpt[indentValue] = 1;
 137         else
 138                 this.depthCpt[indentValue] += 1;
 139
 140         // IE : it's not possible to set colSpan attr to 0 :-(((
 141         linkCellColSpan = cols - indentValue - 1
 142         if (linkCellColSpan == 0)
 143                 linkCell.nullColSpan = true;
 144             else
 145                 linkCell.colSpan = linkCellColSpan;
 146
 147                 img = document.createElement("IMG");
 148                 img.src = row.getAttribute("icon");
 149                 img.height = row.getAttribute("height");
 150                 img.width = row.getAttribute("width");
 151                 a = document.createElement("A");
 152
 153                 a.setAttribute("href", row.getAttribute("url"));
 154                 a.setAttribute("title", row.getAttribute("description"));
 155                 a.innerHTML = row.childNodes[0].nodeValue;
 156
 157                 if (row.getAttribute("state") == "-1") {
 158                         var stateLink = document.createElement("A");
 159                         stateLink.href = ".";
 160                         var stateImg = document.createElement("IMG");
 161                         stateImg.src = this.baseImgUrl + "pl.gif";
 162                         stateImg.border = "0";
 163                         stateImg.height = "16";
 164                         stateImg.width = "16";
 165                         stateLink.appendChild(stateImg)
 166                         stateCell.appendChild(stateLink);
 167                 }
 168                 else
 169                         stateCell.innerHTML = "&nbsp;&nbsp;";
 170
 171                 linkCell.appendChild(img);
 172                 linkCell.appendChild(a);
 173                 newRow.appendChild(indentCell);
 174                 newRow.appendChild(stateCell);
 175                 newRow.appendChild(linkCell);
 176
 177
 178                 this.root.insertBefore(newRow, parentRow.nextSibling);
 179         } //end for
 180
 181         if (incTableDepth) {
 182                 var rows = this.root.getElementsByTagName("TR");
 183                 var cells, lastCell, lastColspan;
 184                 for (var i = 0 ; i < rows.length ; i++) {
 185                         cells = rows[i].getElementsByTagName("TD");
 186                         lastCell = cells[cells.length - 1];
 187
 188                         if (lastCell.nullColSpan) {
 189                                 lastCell.nullColSpan = false;
 190                                 lastColspan = 0;
 191                         }
 192                         else
 193                                 lastColspan = parseInt(lastCell.getAttribute("colspan"));
 194
 195                         lastCell.colSpan = lastColspan + 1;
 196                 }
 197         }
 198 };
 199
 200 /*
 201 * collapse the tree: removes deeper rows after the 'baseRow' passed.
 202 */
 203 TreeMaker.prototype.removeChildNodes = function(baseRow) {
 204         var baseCells = baseRow.getElementsByTagName("TD");
 205         var baseColSpan = baseCells[baseCells.length-1].colSpan;
 206         var nextRow = baseRow.nextSibling;
 207         var tbody = baseRow.parentNode;
 208         var depthCpt = this.depthCpt;
 209         var nextCells, nextRow2;
 210
 211         while (nextRow) {
 212                 if (nextRow.nodeType == 1) {
 213                         nextCells = nextRow.getElementsByTagName("TD");
 214                         if (nextCells.length == 3 && nextCells[2].colSpan < baseColSpan) {
 215                                 nextRow2 = nextRow.nextSibling;
 216                                 depthCpt[nextCells[0].colSpan-1] -= 1;
 217                                 tbody.removeChild(nextRow);
 218                                 nextRow = nextRow2;
 219                                 continue;
 220                         }
 221                         break;
 222                 }
 223                 nextRow = nextRow.nextSibling; // text node
 224         }
 225
 226         // recalc colspans for Safari
 227         var maxDepth = depthCpt.length - 1;
 228         var depthReduction = 0;
 229         while (depthCpt[maxDepth - depthReduction] == 0) {
 230                 depthCpt.pop();
 231                 depthReduction++;
 232         }
 233
 234         if (depthReduction) {
 235                 var rows = tbody.getElementsByTagName("TR");
 236                 var cells, lastCell, lastColspan;
 237                 for (var i = 0 ; i < rows.length ; i++) {
 238                         cells = rows[i].getElementsByTagName("TD");
 239                         lastCell = cells[cells.length - 1];
 240                         lastCell.colSpan = parseInt(lastCell.colSpan) - depthReduction;
 241                 }
 242         }
 243 };
 244 })();