forms - JavaScript - Incrementing a value attribute -


i have problem can't head around (pretty new javascript). need know how increment variables in html document.createelement event (if that's right terminology).

i need increment 'value' attribute every time "add row" button clicked , vise versa "delete row" button.

so far have:

html 

<div id='ctrl_container'>      <form action='$thisuri' method='post' id='spa' name='date2'>      <input type="button" value="add row" onclick="addrow('datatable')" />     <input type="button" value="delete row" onclick="deleterow('datatable')" />  <table id="datatable"  border='0' cellspacing='0' cellpadding='0' >       <tr>         <th> select </th>         <th> id </th>         <th> question </th>     </tr>      <tbody>     <tr>         <td> <input type="checkbox" name="chk[]" /> </td>         <td> 1<input type="hidden" name="q[]" value="1" /> </td>         <td> <input type="text" name="txtbox[]" /> </td>     </tr>     </tbody>  </table>     <input type='submit' value='submit planned audit' name='send'>     </form> </div>

javascript 

function addrow(tableid) {          var table = document.getelementbyid(tableid);          var rowcount = document.getelementbyid(tableid).getelementsbytagname('tbody')         [1].getelementsbytagname('tr').length;         var row = table.insertrow(rowcount +1);          var cell1 = row.insertcell(0);         var element1 = document.createelement("input");         element1.type = "hidden";         element1.name = "q[]";         element1.value = rowcount +1;         cell2.appendchild(element1);         cell2.innerhtml = rowcount +1; }  function deleterow(tableid) {         try {         var table = document.getelementbyid(tableid);         var rowcount = table.rows.length;          for(var i=0; i<rowcount; i++) {             var row = table.rows[i];             var chkbox = row.cells[0].childnodes[0];             if(null != chkbox && true == chkbox.checked) {                 table.deleterow(i);                 rowcount--;                 i--;             }           }         }catch(e) {             alert(e);         } }

can give me pointers?

have @ jsfiddle: http://jsfiddle.net/pdxnb/1/

it give pointers, since row being added visibly now. (the rowcount not problem here guess)

the problem , still is, adding empty cells row. have added cell2 table , can see things happening.

var cell2 = row.insertcell(1); cell2.appendchild(element1); cell2.innerhtml = rowcount +1;

also did debug is: 

    alert(rowcount);

you should able figure rest out yourself. if need anymore please comment below.

tip:

maybe better highest id incremented everytime adding row, , don't worry deletion. way can never have same id's


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