dynamic row creation when click add button

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

           var row = table.insertRow(rowCount);

           var colCount = table.rows[0].cells.length;
           for (var i = 0; i < colCount; i++) {
               var newcell = row.insertCell(i);
               newcell.innerHTML = table.rows[0].cells[i].innerHTML;
               switch (newcell.childNodes[0].type) {
                   case "text1":
                       newcell.childNodes[1].value = "";
                       break;
                   case "text2":
                       newcell.childNodes[0].value = "";
                       break;
                   case "text3":
                       newcell.childNodes[0].value = "";
                       break;
                   case "checkbox":
                       newcell.childNodes[0].checked = false;
                       break;

               }
           }
       }