Get a particular cell value from HTML table using JavaScript

var table = document.getElementById("someTableID"); 
var totalRows = document.getElementById("someTableID").rows.length;
var totalCol = 3; // enter the number of columns in the table minus 1 (first column is 0 not 1)
//To display all values
for (var x = 0; x <= totalRows; x++)
  {
  for (var y = 0; y <= totalCol; y++)
    {
    alert(table.rows[x].cells[y].innerHTML;
    }
  }
//To display a single cell value enter in the row number and column number under rows and cells below:
var firstCell = table.rows[0].cells[0].innerHTML;
alert(firstCell);
//Note:  if you use <th> this will be row 0, so your data will start at row 1 col 0

function Vcount() {
var modify = document.getElementById("C_name1").value;
var oTable = document.getElementById('dataTable');
var i;
var rowLength = oTable.rows.length;
for (i = 1; i < rowLength; i++) {
    var oCells = oTable.rows.item(i).cells;
    if (modify == oCells[0].firstChild.data) {
        document.getElementById("Error").innerHTML = "  * duplicate value";
        return false;
        break;
    }

}

You can also use the DOM way to obtain the cell value: Cells[0].firstChild.data

Read more on that in my post at http://js-code.blogspot.com/2009/03/how-to-change-html-table-cell-value.html

To get the text from this cell-

<table>
    <tr id="somerow">
        <td>some text</td>            
    </tr>
</table>

You can use this -

var Row = document.getElementById("somerow");
var Cells = Row.getElementsByTagName("td");
alert(Cells[0].innerText);