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javascript operates on table sort instance analysis

  • 2020-06-07 04:01:21
  • OfStack

This article gives an example of how javascript operates table sorting. Share to everybody for everybody reference. The details are as follows:

Complete examples are as follows: 


<html>
 <head>
 <title>Table Sort Example</title>
 <script type="text/javascript">
 // Converter, which converts the field type of a column to a sortable type: String,int,float
  function convert(sValue, sDataType) {
  switch(sDataType) {
   case "int":
   return parseInt(sValue);
   case "float":
   return parseFloat(sValue);
   case "date":
   return new Date(Date.parse(sValue));
   default:
   return sValue.toString();
  }
  }
  // The sort function generator, iCol Represents the column index, sDataType Represents the data type of the column 
  function generateCompareTRs(iCol, sDataType) {
  return function compareTRs(oTR1, oTR2) {
    var vValue1 = convert(oTR1.cells[iCol].firstChild.nodeValue, sDataType);
    var vValue2 = convert(oTR2.cells[iCol].firstChild.nodeValue, sDataType);
    if (vValue1 < vValue2) {
    return -1;
    } else if (vValue1 > vValue2) {
    return 1;
    } else {
    return 0;
    }
   };
  }
  // Sorting method 
  function sortTable(sTableID, iCol, sDataType) {
  var oTable = document.getElementById(sTableID);
  var oTBody = oTable.tBodies[0];
  var colDataRows = oTBody.rows;
  var aTRs = new Array;
  // Put all the columns in the array 
  for (var i=0; i < colDataRows.length; i++) {
   aTRs[i] = colDataRows[i];
  }
  // Determine the final 1 Whether the columns that are sorted are the same as the columns that are sorted now, 
  // If yes, use it directly reverse() The reverse 
  if (oTable.sortCol == iCol) {
   aTRs.reverse();
  } else {
   // Array-Using sort Method, passed into the sort function 
   aTRs.sort(generateCompareTRs(iCol, sDataType));
  }
  var oFragment = document.createDocumentFragment();
  for (var i=0; i < aTRs.length; i++) {
   oFragment.appendChild(aTRs[i]);
  }
  oTBody.appendChild(oFragment);
  // Record the last 1 Subsorted column index 
  oTable.sortCol = iCol;
  }
 </script>
 </head>
 <body>
 <p>Click on the table header to sort in ascending order.</p>
 <table border="1" id="tblSort">
  <thead>
  <tr>
   <th onclick="sortTable('tblSort', 0)"
   style="cursor:pointer">Last Name</th>
   <th onclick="sortTable('tblSort', 1)"
   style="cursor:pointer">First Name</th>
   <th onclick="sortTable('tblSort', 2, 'date')"
   style="cursor:pointer">Birthday</th>
   <th onclick="sortTable('tblSort', 3, 'int')"
   style="cursor:pointer">Siblings</th>
  </tr>
  </thead>
  <tbody>
  <tr>
   <td>Smith</td>
   <td>John</td>
   <td>7/12/1978</td>
   <td>2</td>
  </tr>
  <tr>
   <td>Johnson</td>
   <td>Betty</td>
   <td>10/15/1977</td>
   <td>4</td>
  </tr>
  <tr>
   <td>Henderson</td>
   <td>Nathan</td>
   <td>2/25/1949</td>
   <td>1</td>
  </tr>
  <tr>
   <td>Williams</td>
   <td>James</td>
   <td>7/8/1980</td>
   <td>4</td>
  </tr>
  <tr>
   <td>Gilliam</td>
   <td>Michael</td>
   <td>7/22/1949</td>
   <td>1</td>
  </tr>
  <tr>
   <td>Walker</td>
   <td>Matthew</td>
   <td>1/14/2000</td>
   <td>3</td>
  </tr>
  </tbody>
 </table> 
 </body>
</html>

Hopefully, this article has been helpful in your javascript programming.

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