Question

That is how is the maximum colspan, for example:

<table>
 <tr>
  <td> 1 </td>
  <td> 2 </td>
  <td> 3 </td>
 </tr>
 <tr>
  <td> 1 </td>
  <td> 2 </td>
 </tr>
 <tr>
  <td> 1 </td>
 </tr>
</table>

should give 3

Answer 1

Each table has a rows array, and each row has a cells array. Then it’s just a matter a finding the maximum.

function calculateCells(){
    var table = document.getElementById("table");
    var max = 0;
    for(var i=0;i<table.rows.length;i++) {
        if(max < table.rows[i].cells.length)
            max = table.rows[i].cells.length;
    }
    return max;
}