Question

 var $table = $('<table/>').addClass('commentbox');

$table.append('<tr><td>' + 'Comment Id:'+ '</td></tr>');

var $wrap = $('<div/>').attr('id', 'container');

var $in = $('<input type="button" value="Reply"/>').attr('id', 'reply');
$wrap.append($in);
 $table.append(
                 $('<tr>')
                         .append($('<td>'),
                         $('<td>'))
                       );
      $table.append($wrap);

I want the div id container to be added inside td
but I am getting html

 <table>
   <tbody>
    <tr>
      <td>Comment</td>
     </tr>
     <tr>
        <td>
        </td><td></td>
     </tr>
  <tbody>
     <div id="container">
      <input type="button" value="Reply" id="reply">
     </div>
</table>

Answer 1

You need to append the $wrap object to the <td> element, not the $table.

Try something like this instead:

var $table = $('<table/>').addClass('commentbox');

$table.append('<tr><td>' + 'Comment Id:'+ '</td></tr>');

var $wrap = $('<div/>').attr('id', 'container');
var $in   = $('<input type="button" value="Reply"/>').attr('id', 'reply');

$wrap.append($in);

$table.append(
    $('<tr>').append($('<td>').append($wrap), $('<td>').html('hello'))
);

Demo here: http://jsfiddle.net/umCDP/