Assign options to select input through javascript

Issue

I have a Select menu in my site, inside a table.

<select name = "menu" id="menu" >
   <option>A</option>
   <option>B</option>
   <option>C</option>
</select> 

I'm trying to do a JavaScript function to add another select menu with the same options in a row below of the table.
I have this:

function addRow(tableID) {
    var table = document.getElementById(tableID);
    var rowCount = table.rows.length;
    var row = table.insertRow(rowCount);

    var cell1 = row.insertCell(0);
    var element1 = document.createElement("select");
    element1.id = "id";
    cell1.appendChild(element1);
}

But I don't know where to add the options in here.

I hope someone could help me.

Solution

If you want to copy it exactly anyway you could also use cloneNode() similar to this:

function addRow(tableID) {
    var table = document.getElementById(tableID);
    var rowCount = table.rows.length;
    var row = table.insertRow(rowCount);

    var cell1 = row.insertCell(0);

    // Get a handle to the original select
    var orgSelect = document.getElementById("menu");

    // Make a clone, using true to indicate we also want to clone child nodes
    var dupSelect = orgSelect.cloneNode(true);

    // Change any attributes of the new select
    dupSelect.id = "id";

    // Append the new select
    cell1.appendChild(dupSelect);
}

---

DEMO - Using cloneNode() to duplicate a select and options

---

You could then even make this a function you call, passing any relevant parameters, similar to this:

function createClone(elementId, newId, includeChildNodes){
    var original = document.getElementById(elementId);
    var duplicate = original.cloneNode(includeChildNodes);

    duplicate.id = newId;

    return duplicate;
}

// Call it like this
var clonedElement = createClone('menu', 'newMenu', true);

Answered By - Nope