Question

I have a web form where I need to have an additional field displayed on the screen if a certain option is selected in a drop down list. I have followed several Javascript tutorials online and none have worked so far. Here is one of the things I already tried:

    <script type="text/javascript">
    function setup(ans) {
      lit = ''
      if (ans == 'manual') {
        lit = 'Manual Selected'
        lit = lit + '<tr>'
        lit = lit + '<th align="right" class="body-text">Add New Group</th>'
        lit = lit + '<td class="body-text"><input type="text" name="groupadd">'
        lit = lit + '</td> </tr>'
     }
      document.getElementById('rep').innerHTML=lit
    }
    </script>

It doesn’t work. What else can I try?

I have also seen “http://stackoverflow.com/questions/7353403/javascript-hide-a-form-input-depending-on-the-value-of-a-particular-drop-down” but it does not work for me either.

Thanks!

And this is what I want to add:

    <tr>
        <th align="right" class="body-text">Add New Group</th>
        <td class="body-text"><input type="text" name="groupadd"></td>
    </tr>

Answer 1

Try this.

  trElement = document.createElement('tr');

  thElement = document.createElement('th');
  thElement.className = "body-text";
  thElement.innerHTML = "Add New Group";

  trElement.appendChild(th);

  tdElement = document.createElement("td");
  tdElement.className = "body-text";
  inputElement = document.createElement("input");
  inputElement.type = "text";
  inputElement.name = "groupadd";

  tdElement.appendChild(inputElement);
  trElement.appendChild(tdElement);

  document.getElementById("new_field_div").appendChild(trElement);