Dynamically adding a combo box

Question

I am trying to create a table in HTML that can add a row when I click the "add row" button and the same goes for deleting the added row if I intend to delete it. I wrote javascript to add checkbox and text. But I want only combo boxes in it, and I'm stuck in the middle. Could you guys understand this and let me know how to do this? This is my js file.

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("input");
        element1.type = "checkbox";
        cell1.appendChild(element1);

        var cell2 = row.insertCell(1);
        cell2.innerHTML = rowCount + 1;

        var cell3 = row.insertCell(2);
        var element2 = document.createElement("input");
        element2.type = "text";
        cell3.appendChild(element2);

        var cell4 = row.insertCell(3);
        var element3 = document.createElement("input");
        element3.type = "text";
        cell4.appendChild(element3);

        var cell5 = row.insertCell(4);
        //This is where the PROBLEM is!!
                    var element4 = document.createElement("select");
        element4.type = "option";
        cell5.appendChild(element4);

    }

    function deleteRow(tableID) {
        try {
        var table = document.getElementById(tableID);
        var rowCount = table.rows.length;

        for(var i=0; i<rowCount; i++) {
            var row = table.rows[i];
            var chkbox = row.cells[0].childNodes[0];
            if(null != chkbox && true == chkbox.checked) {
                table.deleteRow(i);
                rowCount--;
                i--;
            }

        }
        }catch(e) {
            alert(e);
        }
    }

// JavaScript document

NOTE. Please do not offer SERVICE DISCOUNTS. I just do the homework in Java Script :)

Answer 1

This should do the trick:

 var cell5 = row.insertCell(4);
 //This is where the SOLUTION is!!
 var element4 = document.createElement("select");
 var option1 = document.createElement("option");
 option1.value="1";
 option1.innerHTML="sample1";
 element4.appendChild(option1);
 var option2 = document.createElement("option");
 option2.value="2";
 option2.innerHTML="sample2";               
 element4.appendChild(option2);
  cell5.appendChild(element4);

Answer 2

, . HTML-, :

    <select>
       <option></option>
       <option></option>
    </select>

, , ? , . , JavaScript, ?

 var element4 = document.createElement("select");

. , ?

   var option1 = document.createElement("option");

?

? .

   element4.appendChild(option1);

, , .

Answer 3

why not try

var sel=document.createElement("select");

// repeat this for each option you have

var opt=document.createElement("option");
opt.value="my option value";
opt.text="my option to be displayed";
sel.appendChild(opt);

// end repeat

cell5.appendChild(sel);