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Editorial Team
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Asked: 2026-06-09T05:24:25+00:00

I have a form/table that is dynamically altered via JS by adding/removing rows (form

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I have a form/table that is dynamically altered via JS by adding/removing rows (form inputs). I want to create a column that counts the number of rows, so I tried using,

$("#rowcount:last").replaceWith( "<td>" + newNum + "</td>" );

to change the counter columns last element to the new number, but the ‘:last’ selector doesn’t seem to work in this case. Here is my code for reference (sorry for the ugliness of my form. I tried to make it look as pretty as I could, but because of my limited experience, it still looks like it was slapped on the wrong side at birth):

<html>

<head>
<title></title>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.3/jquery.min.js"></script>
<script src="jquery.maskedinput.js" type="text/javascript"></script>

<script type="text/javascript">
    $(document).ready(function() {
        $('#btnAdd').click(function() {
            var num     = $('.ccinput').length; // how many "duplicatable" input fields we currently have
            var newNum  = new Number(num + 1);      // the numeric ID of the new input field being added

            // create the new element via clone(), and manipulate it's ID using newNum value
            var newElem = $('#input' + num).clone().attr('id', 'input' + newNum);

            // insert the new element after the last "duplicatable" input field
            $('#input' + num).after(newElem);
            $("#rowcount").replaceWith( "<td>" + newNum + "</td>" );

            // enable the "remove" button
            $('#btnDel').attr('disabled','');

            $("*#date").mask("99/99/9999");

            // business rule: you can only add 20 names
            if (newNum == 20)
                $('#btnAdd').attr('disabled','disabled');
        });

        $('#btnDel').click(function() {
            var num = $('.ccinput').length; // how many "duplicatable" input fields we currently have
            $('#input' + num).remove();     // remove the last element

            // enable the "add" button
            $('#btnAdd').attr('disabled','');

            // if only one element remains, disable the "remove" button
            if (num-1 == 1)
                $('#btnDel').attr('disabled','disabled');
        });

        $("*#date").mask("99/99/9999");
    });
</script>
</head>

<body>

<form method="post" action="<?php echo htmlentities($PHP_SELF); ?>">
<table border="1" cellspacing="0">
<tr>
<th></th>
<th># (last four digits)</th>
<th>Amount</th>
<th>Approval</th>
<th>Date Received</th>
</tr>
<tbody>
    <tr id="input1" class="ccinput">
    <td id="rowcount"> 1 </td>
    <td> <input id="cnum" type="text" name="cc_num[]" maxlength="4" /> </td> 
    <td> <input id="camnt" type="int" name="cc_amnt[]" /> </td>
    <td> <input id="appr" type="text" name="cc_app[]" maxlength="10" /> </td> 
    <td> <input id="date" type="text" name="cc_date[]" /> </td>
    </tr>
</tbody>
</table>
<div>
    <input type="button" id="btnAdd" value="Add" />
    <input type="button" id="btnDel" value="Remove" />
</div>
<input type="submit" value="Submit" name="submit" />
</form>

</body>
</html>
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1 Answer

  1. Editorial Team

    You can use the :last selector:

     var newElem = $('.ccinput:last').clone().attr('id', 'input' + newNum);
 $('.ccinput:last').after(newElem);
 $(".ccinput:last td:first").replaceWith( "<td>" + newNum + "</td>" );

    or instead of replaceWith() you can try:

     $(".ccinput:last td:first").html(newNum).removeAttr('id');

    DEMO

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