Adding dropdown list to new row on button click

Question

I am trying to add a new row on button click. In my new row I am trying to add a Textbox and a dropdown list. I don't know what I am doing wrong ? Can anybody help me with this problem. Thanks in advance.

HTML

<table>
        <tr>
            <td><input type="text" name="data1" value="TempData" /></td>
              <td><button type="button" onClick ="addRow(this)">Add</button></td>
         </tr>

 </table>

Javascript function:

function addRow(btn) {         
    var parentRow = btn.parentNode.parentNode;
    var table = parentRow.parentNode;
    var rowCount = table.rows.length;

    var row = table.insertRow(rowCount);

    var cell1 = row.insertCell(0);
    var element1 = document.createElement("input");
    element1.type = "text";
    cell1.appendChild(element1);


    var cell3 = row.insertCell(1);
    var element2 = document.createElement("input");
    element2.type = "select";
    var option1 = document.createElement("option");
    option1.innerHTML = "Option1";
    option1.value = "1";
    element2.add(option1, null);
    var option2 = document.createElement("option");
    option2.innerHTML = "Option2";
    option2.value = "2";
    element2.add(option2, null);
    cell3.appendChild(element2);
}

JSFiddle http://jsfiddle.net/wAyhm/2/

Solution

function addRow(btn) {         
    var parentRow = btn.parentNode.parentNode;
    var table = parentRow.parentNode;
    var rowCount = table.rows.length;
    var row = table.insertRow(rowCount);
    var cell1 = row.insertCell(0);
    var element1 = document.createElement("input");
    element1.type = "text";
    cell1.appendChild(element1);
    var cell3 = row.insertCell(1);
    //var element2 = document.createElement("input");
    var element2 = document.createElement("select");
    //element2.type = "select";
    var option1 = document.createElement("option");
    option1.innerHTML = "Option1";
    option1.value = "1";
    element2.add(option1, null);
    var option2 = document.createElement("option");
    option2.innerHTML = "Option2";
    option2.value = "2";
    element2.add(option2, null);
    cell3.appendChild(element2);
}

Updated Fiddle:

Problem was with the commented lines. A select element isn't an input element. You can't have a <input type="select"/>. Since an HTMLInputElement doesn't have an add method, addRow threw an exception.

Comments

[PhantomM]

Can you suggest solution for the following question as well ? stackoverflow.com/questions/17255841/…

[Vivek Sadh]

What is the meaning of the first 2 lines ? var parentRow = btn.parentNode.parentNode; var table = parentRow.parentNode;