Question

I want to create a table structure with checkbox for each row and each row is identified with different colors, how can I achieve this

Answer 1

CSS:

.odd {
  color:#CCC;
  background-color:#333;
}
.even {
  color:#333;
  background-color:#CCC;
}

HTML:

<table id="tbl">
  <tr class="odd">
   <td><input type="checkbox"/></td>
   <td>First row</td>
  </tr>
  <tr class="even">
   <td><input type="checkbox"/></td>
   <td>Second row</td>
  </tr>
  <tr class="odd">
   <td><input type="checkbox"/></td>
   <td>Third row</td>
  </tr>
</table>

JavaScript:

function addRow(text)
{
  var rows = document.getElementById('tbl').getElementsByTagName('tr');
  var last = rows.item(rows.length - 1);
  var odd = last.getAttribute('class') == "odd"; 
  //use regex instead of == if you plan to have multiple classes for rows

  var row = document.createElement('tr');
  var td = document.createElement('td');
  var ip = document.createElement('input');
  ip.setAttribute('type', 'checkbox');
  td.appendChild(ip);
  tr.appendChild(td);
  td = document.createElement('td');
  td.appendChild(document.createTextNode(text));
  tr.appendChild(td);
  tr.setAttribute('class', odd ? 'even' : 'odd');
  document.getElementById('tbl').appendChild(tr);
}

Add rows using:

addRow("Fourth row");
addRow("Another row");
addRow("One more row");