mochikit_v14/examples/sortable_tables/sortable_tables.js

   1 /*
   2
   3 On page load, the SortableManager:
   4
   5 - Finds the table by its id (sortable_table).
   6 - Parses its thead for columns with a "mochi:format" attribute.
   7 - Parses the data out of the tbody based upon information given in the
   8   "mochi:format" attribute, and clones the tr elements for later re-use.
   9 - Clones the column header th elements for use as a template when drawing
  10   sort arrow columns.
  11 - Stores away a reference to the tbody, as it will be replaced on each sort.
  12 - Performs the first sort.
  13
  14
  15 On sort request:
  16
  17 - Sorts the data based on the given key and direction
  18 - Creates a new tbody from the rows in the new ordering
  19 - Replaces the column header th elements with clickable versions, adding an
  20    indicator (&uarr; or &darr;) to the most recently sorted column.
  21
  22 */
  23
  24 SortableManager = function () {
  25     this.thead = null;
  26     this.tbody = null;
  27     this.columns = [];
  28     this.rows = [];
  29     this.sortState = {};
  30     this.sortkey = 0;
  31 };
  32
  33 mouseOverFunc = function () {
  34     addElementClass(this, "over");
  35 };
  36
  37 mouseOutFunc = function () {
  38     removeElementClass(this, "over");
  39 };
  40
  41 ignoreEvent = function (ev) {
  42     if (ev && ev.preventDefault) {
  43         ev.preventDefault();
  44         ev.stopPropagation();
  45     } else if (typeof(event) != 'undefined') {
  46         event.cancelBubble = false;
  47         event.returnValue = false;
  48     }
  49 };
  50
  51
  52 update(SortableManager.prototype, {
  53
  54     "initWithTable": function (table) {
  55         /***
  56
  57             Initialize the SortableManager with a table object
  58
  59         ***/
  60         // Ensure that it's a DOM element
  61         table = getElement(table);
  62         // Find the thead
  63         this.thead = table.getElementsByTagName('thead')[0];
  64         // get the mochi:format key and contents for each column header
  65         var cols = this.thead.getElementsByTagName('th');
  66         for (var i = 0; i < cols.length; i++) {
  67             var node = cols[i];
  68             var attr = null;
  69             try {
  70                 attr = node.getAttribute("mochi:format");
  71             } catch (err) {
  72                 // pass
  73             }
  74             var o = node.childNodes;
  75             this.columns.push({
  76                 "format": attr,
  77                 "element": node,
  78                 "proto": node.cloneNode(true)
  79             });
  80         }
  81         // scrape the tbody for data
  82         this.tbody = table.getElementsByTagName('tbody')[0];
  83         // every row
  84         var rows = this.tbody.getElementsByTagName('tr');
  85         for (var i = 0; i < rows.length; i++) {
  86             // every cell
  87             var row = rows[i];
  88             var cols = row.getElementsByTagName('td');
  89             var rowData = [];
  90             for (var j = 0; j < cols.length; j++) {
  91                 // scrape the text and build the appropriate object out of it
  92                 var cell = cols[j];
  93                 var obj = scrapeText(cell);
  94                 switch (this.columns[j].format) {
  95                     case 'isodate':
  96                         obj = isoDate(obj);
  97                         break;
  98                     case 'str':
  99                         break;
 100                     case 'istr':
 101                         obj = obj.toLowerCase();
 102                         break;
 103                     // cases for numbers, etc. could be here
 104                     default:
 105                         break;
 106                 }
 107                 rowData.push(obj);
 108             }
 109             // stow away a reference to the TR and save it
 110             rowData.row = row.cloneNode(true);
 111             this.rows.push(rowData);
 112
 113         }
 114
 115         // do initial sort on first column
 116         this.drawSortedRows(this.sortkey, true, false);
 117
 118     },
 119
 120     "onSortClick": function (name) {
 121         /***
 122
 123             Return a sort function for click events
 124
 125         ***/
 126         return method(this, function () {
 127             log('onSortClick', name);
 128             var order = this.sortState[name];
 129             if (order == null) {
 130                 order = true;
 131             } else if (name == this.sortkey) {
 132                 order = !order;
 133             }
 134             this.drawSortedRows(name, order, true);
 135         });
 136     },
 137
 138     "drawSortedRows": function (key, forward, clicked) {
 139         /***
 140
 141             Draw the new sorted table body, and modify the column headers
 142             if appropriate
 143
 144         ***/
 145         log('drawSortedRows', key, forward);
 146         this.sortkey = key;
 147         // sort based on the state given (forward or reverse)
 148         var cmp = (forward ? keyComparator : reverseKeyComparator);
 149         this.rows.sort(cmp(key));
 150         // save it so we can flip next time
 151         this.sortState[key] = forward;
 152         // get every "row" element from this.rows and make a new tbody
 153         var newBody = TBODY(null, map(itemgetter("row"), this.rows));
 154         // swap in the new tbody
 155         this.tbody = swapDOM(this.tbody, newBody);
 156         for (var i = 0; i < this.columns.length; i++) {
 157             var col = this.columns[i];
 158             var node = col.proto.cloneNode(true);
 159             // remove the existing events to minimize IE leaks
 160             col.element.onclick = null;
 161             col.element.onmousedown = null;
 162             col.element.onmouseover = null;
 163             col.element.onmouseout = null;
 164             // set new events for the new node
 165             node.onclick = this.onSortClick(i);
 166             node.onmousedown = ignoreEvent;
 167             node.onmouseover = mouseOverFunc;
 168             node.onmouseout = mouseOutFunc;
 169             // if this is the sorted column
 170             if (key == i) {
 171                 // \u2193 is down arrow, \u2191 is up arrow
 172                 // forward sorts mean the rows get bigger going down
 173                 var arrow = (forward ? "\u2193" : "\u2191");
 174                 // add the character to the column header
 175                 node.appendChild(SPAN(null, arrow));
 176                 if (clicked) {
 177                     node.onmouseover();
 178                 }
 179             }
 180
 181             // swap in the new th
 182             col.element = swapDOM(col.element, node);
 183         }
 184     }
 185 });
 186
 187 sortableManager = new SortableManager();
 188
 189 addLoadEvent(function () {
 190     sortableManager.initWithTable('sortable_table');
 191 });
 192
 193 // rewrite the view-source links
 194 addLoadEvent(function () {
 195     var elems = getElementsByTagAndClassName("A", "view-source");
 196     var page = "sortable_tables/";
 197     for (var i = 0; i < elems.length; i++) {
 198         var elem = elems[i];
 199         var href = elem.href.split(/\//).pop();
 200         elem.target = "_blank";
 201         elem.href = "../view-source/view-source.html#" + page + href;
 202     }
 203 });