add rows to table javascript code example

Example 1: javascript insert row at end of table

<table id="ThisTable">
  <tr><th>Head1</th><th>Head2</th><th>Head2</th></tr>
  <tr><td>Data1</td><td>Data1</td><td>Data1</td></tr>
  <tr><td>Data2</td><td>Data2</td><td>Data2</td></tr>
</table>
<script>
  var table = document.getElementById("ThisTable");
  var row = table.insertRow(-1);
  <!-- Filling the new created cell -->
  var cell1 = row.insertCell(0);
  var cell2 = row.insertCell(1);
  var cell3 = row.insertCell(2);
  cell1.innerHTML = "NEW CELL1";
  cell2.innerHTML = "NEW CELL2";
  cell3.innerHTML = "NEW CELL3";
</script>
<!-- The (-1) indexes the last position of the table -->

Example 2: javascript append to html table tr

<table id="myTable">
  <tr>
    <td>Row1 cell1</td>
    <td>Row1 cell2</td>
  </tr>
  <tr>
    <td>Row2 cell1</td>
    <td>Row2 cell2</td>
  </tr>
  <tr>
    <td>Row3 cell1</td>
    <td>Row3 cell2</td>
  </tr>
</table>
<button type="button" onclick="myFunction()">Try it</button>

<script>
function myFunction() {
  var table = document.getElementById("myTable");
  var row = table.insertRow(0);
  var cell1 = row.insertCell(0);
  var cell2 = row.insertCell(1);
  cell1.innerHTML = "NEW CELL1";
  cell2.innerHTML = "NEW CELL2";
}
</script>