dojo小代码

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Using event delegation on an HTML table to highlight rows and columns.

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js代码：

require([
  'dojo/on',
  'dojo/dom-class',
  'dojo/dom-attr',
  'dojo/query',  // note that dojo/query must be loaded for event delegation to work
  'dojo/domReady!'
], function(on, domClass, domAttr, query) {

  var highlighter = {

    setCol: function(cellIdx, classStr, tbl) {
      var i = 0, len = tbl.rows.length;
      for (i; i < len; i++) {
        var cell = tbl.rows[i].cells[cellIdx];
        if (cell && !domAttr.has(cell, 'colspan')) {  // provided index might not be available and skip header
                                                      //cells with colspan
          domClass.toggle(cell, classStr)
        }
      }
    },

    highlightCol: function(cssQuery, classStr) {
      var self = this;
      query(cssQuery).on('td:mouseover, td:mouseout', function(evt) {
        self.setCol(this.cellIndex, classStr, evt.currentTarget);
      });
    },

    highlightRow: function(cssQuery, classStr) {
      // note: this could also just be set through css with pseudoclass hover
      query(cssQuery).on('tr:mouseover, tr:mouseout', function() {
        domClass.toggle(this, classStr);
      });
    },

    highlightBoth: function(cssQuery, classStrRow, classStrCol){
      var self = this;
      query(cssQuery).on('td:mouseover, td:mouseout', function(evt) {
        var tbl = evt.currentTarget;
        var tr = evt.target.parentNode;
        var td = evt.target;
        self.setCol(td.cellIndex, classStrCol, tbl);
        domClass.toggle(tr, classStrRow);
      });
    }
  };

  highlighter.highlightBoth('#tbl', 'tdHover', 'trHover');

});
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css代码：

#tbl { border-collapse: collapse; }
#tbl td, #tbl th { border-color: #AAAAAA; border-style: solid; border-width: 0 1px; padding: 3px 9px; }

#tbl th { text-align: center; }
#tbl td, .tbl th { text-align: right; }
#tbl td:first-child { text-align: left; }

.tdHover { background-color: #005197; color: #ffffff; }
.trHover { background-color: #E98900; color: #ffffff; }
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html代码：

<table id="tbl">
<tbody>
  <tr><th></th><th colspan="12">Main</th></tr>
  <tr><th></th><th colspan="2">Sub 1</th><th colspan="2">Sub 2</th><th colspan="2">Sub 3</th>
    <th colspan="2">Sub 4</th><th colspan="2">Sub 5</th><th colspan="2">Sub 6</th></tr>
  <tr><th>Categories</th><th>Unit</th><th>± %</th><th>Unit</th><th>± %</th><th>Unit</th><th>± %</th><th>Unit</th>
    <th>± %</th><th>Unit</th><th>± %</th><th>Unit</th><th>± %</th></tr>
  <tr><td>Category 1</td><td>473</td><td>15</td><td>686</td><td>540</td><td>141</td><td>101</td><td>1935</td>
    <td>745</td><td>43</td><td>161</td><td>515</td><td>52</td></tr>
  <tr><td>Category 2</td><td>20</td><td>161</td><td>127</td><td>13</td><td>201</td><td>14</td><td>278</td>
    <td>31</td><td>921</td><td>519</td><td>103</td><td>608</td></tr>
  <tr><td>Category 3</td><td>18</td><td>80</td><td>10</td><td>99</td><td>5</td><td>71</td><td>3</td>
    <td>70</td><td>1</td><td>105</td><td>10</td><td>45</td></tr>
  <tr><td>Catogory 4</td><td>378</td><td>9</td><td>943</td><td>11</td><td>1747</td><td>94</td>
    <td>236</td><td>19</td><td>3265</td><td>95</td><td>6788</td><td>4</td></tr>
</tbody>
</table>
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代码运行效果：