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 "text":
break;
case "checkbox":
newcell.childNodes[0].checked = false;
break;
case "select-one":
newcell.childNodes[0].selectedIndex = 0;
break;
}
}
}

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) {
if(rowCount <= 1) {
alert("Cannot delete all the rows.");
break;
}
table.deleteRow(i);
rowCount--;
i--;
}

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

Give id to table: id="dataTable"

Use on button out of table
onclick="addRow('dataTable')" for add row
onclick="deleteRow('dataTable')" for delete row

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