Sorttable.js (Javascript table sorting) not working when table created in javascript

Question

I'm trying to use the sorttable.js package to make an HTML table sortable when the column header is clicked. I can get this to work just fine when the table is declared statically in the HTML:

fiddle

<table class="sortable" style="width:100%">
  <tr>
    <th>Firstname</th>
    <th>Lastname</th> 
    <th>Points</th>
  </tr>
  <tr>
    <td>Eve</td>
    <td>Jackson</td> 
    <td>94</td>
  </tr>
    <tr>
    <td>Joe</td>
    <td>Smith</td> 
    <td>50</td>
  </tr>
    <tr>
    <td>Abraham</td>
    <td>Jones</td> 
    <td>4</td>
  </tr>
</table>

However, when I create the table with javascript, the sorting functionality isn't there anymore, and I get error messages on the console:

fiddle

  tbl_array = new Array()
  tbl_array = [["Firstname","Lastname","Points"], ["Eve","Jackson","94"], ["Joe","Smith","50"], ["Abraham","Jones","4"]]
  var body = document.body,
        tbl = document.getElementById('summaryTable');

    // clear all rows on the table
    while(tbl.rows.length > 0){
        tbl.deleteRow(0)
    }
    tbl.style.width  = '100px';
    tbl.style.border = '1px solid black';

    numRows = tbl_array.length
    numCols = tbl_array[0].length

    // insert each 2D array entry into a table cell
    for(var i = 0; i < numRows; i++){

    // insert header
    if (i == 0){
        var header = tbl.createTBody();
        var row = header.insertRow();
            for (var j=0; j < numCols; ++j){
            var cell = document.createElement('th')
            cell.appendChild(document.createTextNode(tbl_array[i][j]));
            cell.style.border='1px solid black';
            cell.style.fontWeight = "bold";
            row.appendChild(cell)
          }
    }

    else{
      var tr = tbl.insertRow();
      for(var j = 0; j < numCols; j++){
          var td = tr.insertCell();
          td.appendChild(document.createTextNode(tbl_array[i][j]));
          td.style.border = '1px solid black';
      }
    }
    }
  console.log("tbl", tbl) 

The only thing I can think of is that I'm not formatting the table correctly with the javascript, but when I printed both tables to the console and examined their structures, they were basically the same:

<table ...>
    <tbody>
        <tr ...>
            <th>..</th>
            <th>..</th>
        </tr>
        <tr>
            <td>..</td>
            <td>..</td>
        </tr>
    </tbody>
</table>

Is my error in the way I'm creating the table with javascript? Any help would be appreciated. Thanks!

Answer 1

sorttable.js assumes all tables are already in the HTML when it initializes; your table is dynamically generated, so you have to bootstrap the makeSortable method manually.

Right before your console.log , try inserting this:

sorttable.makeSortable(document.getElementById('summaryTable'));