html - Adding new rows to table on clicking button in JQuery

Question

I am pretty new to jquery. I have the following code. Here I want to get new rows in the table by clicking the add button, but I can't get it.,

can someone tell me what mistake I have done here?

<script type="text/javascript">
var $ = jQuery.noConflict();
$("#addrows").click(function () {
  if (document.getElementById("hiddenprice").value == "") {
    imagecounter = 4;
   } else {
   imagecounter = parseFloat(document.getElementById("hiddenprice").value) +1;
   }
  //imagecounter=4;     
  var newImageDiv = $(document.createElement('div'))
   .attr("id", 'add_div' + imagecounter);
  newImageDiv.after().html('<table width="100%" cellpadding="0" 
  cellspacing="0" class="pdzn_tbl1" border="0">' +
  '<tr><td><input type="text" name="rollno<? $i ?>"/></td>' +
  '<td><input type="text" name="firstname<? $i ?>" /></td>' +
  '<td><input type="text" name="lastname<? $i ?>" /></td></tr></table>');

  newImageDiv.appendTo("#addgroup");
  $("tr:last").after(newImageDiv);
  document.getElementById("hiddenprice").value = imagecounter;
  imagecounter++;
});
</script>
<div class="common" style="width:1040px; -overflow-x:scroll; padding: 5px 5px 0 5px;">
  <table id="maintable" width="50%" cellpadding="0" cellspacing="0" class="pdzn_tbl1" border="#729111 1px solid" >
  <tr>  
    <th>Roll No</th>
    <th>First Name</th>
    <th>Last Name</th>
  </tr>
  <?php $t_row=3; for($i=1;$i<=$t_row;$i++) {   ?>
  <tr id="rows">
    <div> 
      <td><input type="text" name="rollno<? $i ?>"/></td>
      <td><input type="text" name="firstname<? $i ?>"/></td>
      <td> <input type="text" name="lastname<? $i ?>"/></td>
    </div>
  </tr>
  <? } ?>

  <div id="addgroup"> 
    <div id="add_div1"> </div>
  </div> 
  <table>
    <input type="button" name="add" value="+Add" id="addrows" />
    <input type="hidden" id="hiddenprice" name="hiddenprice" value="3"/> 
  </table>
</div>

Code Formatted & Edit: Code alignments updated and removed unwanted style codes for better readability

Answer 1

Sample DEMO for Adding new row

$("#addrows").click(function () {
     $("#mytable").each(function () {
         var tds = '<tr>';
         jQuery.each($('tr:last td', this), function () {
             tds += '<td>' + $(this).html() + '</td>';
         });
         tds += '</tr>';
         if ($('tbody', this).length > 0) {
             $('tbody', this).append(tds);
         } else {
             $(this).append(tds);
         }
     });
});

Updated: Here div close at wrong place, it should end before tr close, may be thats the error

<tr id="rows">
<div style="padding-left: 5px"> 
<td style="padding:5px;" > <input type="text" name="rollno<? $i ?>"  /> </td>
<td style="padding:5px;"> <input type="text" name="firstname<? $i ?>" /> </td>
<td style="padding:5px;"> <input type="text" name="lastname<? $i ?>" /> </td>
</div> // right
</tr>
</div> // wrong

UPDATED DEMO 2