Question

I want to add/remove rows in a table dynamically. I have javascript function to add and remove the rows. But, I want the delete button beside every single row so that I can delete a particular row.

ANd I want to add a row only if the first row is completely filled.

function to remove row

 function removeRowFromTable()
{
  var tbl = document.getElementById('tblSample');
  var lastRow = tbl.rows.length;
  if (lastRow > 2) tbl.deleteRow(lastRow - 1);
}

function to add rows:

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 = "text";
            cell1.appendChild(element1);

            var cell2 = row.insertCell(1);
            var element2 = document.createElement("input");
            element2.type = "text";
            cell2.appendChild(element2);
        }

my table:

<table id="tableId">
<tr><td>Host Name</td><td>Directory</td></tr>
<tr><td><input type="text"/></td><td><input type="text"/></td></tr>
<tr><td><input type="button" value="+" onclick="addRow(tableId)"/></td>
<td><input type="button" value="-" onclick="removeRowFromTable()"/></td></tr>
</table>

Any help is appreciated! Thanks in Advance!!!

Answer 1

If you put a delete button on each row, then:

<tr>
  <td><input type="button" value="Delete row" onclick="deleteRow(this)">
  <td><input type="text">
  <td><input type="text">
</tr>

And the deleteRow function can be:

function deleteRow(el) {

  // while there are parents, keep going until reach TR 
  while (el.parentNode && el.tagName.toLowerCase() != 'tr') {
    el = el.parentNode;
  }

  // If el has a parentNode it must be a TR, so delete it
  // Don't delte if only 3 rows left in table
  if (el.parentNode && el.parentNode.rows.length > 3) {
    el.parentNode.removeChild(el);
  }
}

BTW, if all your rows have the same content, it will be much faster to add a row by cloning an existing row:

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

  if (!table) return;

  var newRow = table.rows[1].cloneNode(true);

  // Now get the inputs and modify their names 
  var inputs = newRow.getElementsByTagName('input');

  for (var i=0, iLen=inputs.length; i<iLen; i++) {
    // Update inputs[i]
  }

  // Add the new row to the tBody (required for IE)
  var tBody = table.tBodies[0];
  tBody.insertBefore(newRow, tBody.lastChild);
}