How to insert after 2nd element?

Question

How can I insert something after the second form with mform class, for this markup:

<table id="sortme">
  <tr>
    <td>1</td>
    <td><form class="mform"></form></td>
  </tr>
    <tr>
    <td>2</td>
    <td><form class="mform"></form><!---Insert Me here !---></td>
  </tr>
    <tr>
    <td>3</td>
    <td><form class="mform"></form></td>
  </tr>
</table>

To insert after the first form, I can use:

$(function () {
$('<div>block</div>').insertAfter("#sortme form.mform:first");
});

so I've tried this code for the second, didn't work:

$(function () {
$('<div>block</div>').insertAfter("#sortme > form.mform:nth-child(2)");
});

Answer 1

Try .insertAfter("#sortme form.mform:eq(1)");

Answer 2

You, also, may use a counter, conditional statement and append as follows:

<script>
    $(document).ready(function(){
      counter = 0;
      $(".mform").each(function(){
        if (counter === 1){
          $(this).append("<div>Block</div>");
        }
        counter++;
      });
    });
  </script>

A demo is HERE