Change Rowspan using javascript

How do you change the rowspan property of a table cell using javascript?
trizzagAsked:
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ZontarCommented:
tdObj.rowSpan = "3";  //  capital "S"

or

tdObj.setAttribute("rowspan", "3");  //  lowercase "s"

where

tdObj is a DOM reference to the TD element.
0
NetGrooveCommented:
Like this:

<html>
<head>
<script>
function change(){
  tb = document.getElementsByTagName('table')[0].firstChild;
  td = tb.rows[1].cells[0];
  td.colSpan=3;
}
</script>
</head>
<body>
<table border=1>
<tr><td>A</td><td>B</td><td>C</td></tr>
<tr><td><center>1</center></td></tr>
<tr><td>A</td><td>B</td><td>C</td></tr>
</table>
<form>
<input type=button value=Change
onClick="change()">
</form>
</body>
</html>


0
devicCommented:
hi trizzag,

here is two ways:

==================================
<table border=1 width=300 height=300>
<tr id=myrow>
      <td>&nbsp;</td>
      <td>&nbsp;</td>
</tr>
</table>

<script>
function changeRowColor()
{
      var myRow=document.getElementById("myrow");
      myRow.bgColor="red";
}
</script>
<button onclick=changeRowColor()>change Row Color to red</button>



<script>
function changeRowColor2()
{
      var myRow=document.getElementById("myrow");
      myRow.setAttribute("bgColor","blue");
}
</script>
<button onclick=changeRowColor2()>change Row Color to blue</button>
0
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ZontarCommented:
NetGroove: He said rowspan, not colspan.

devic: He said rowspan, not row colour.

Please read the question again.
0
devicCommented:
@Zontar you are right!

but is same way ;)

================================
<table border=1 width=300 height=300>
<tr>
      <td id=mytd>&nbsp;</td>
      <td>&nbsp;</td>
</tr>
<tr>
      <td>&nbsp;</td>
</tr>
</table>

<script>
function changeRowColor()
{
      var myTD=document.getElementById("mytd");
      myTD.rowSpan="2";
}
</script>
<button onclick=changeRowColor()>change Row Color to red</button>



<script>
function changeRowColor2()
{
      var myTD=document.getElementById("mytd");
      myTD.setAttribute("rowSpan","1");
}
</script>
<button onclick=changeRowColor2()>change Row Color to blue</button>
0
devicCommented:
with right buttons values ;)

=======================================
<table border=1 width=300 height=300>
<tr>
      <td id=mytd>&nbsp;</td>
      <td>&nbsp;</td>
</tr>
<tr>
      <td>&nbsp;</td>
</tr>
</table>

<script>
function changeRowColor()
{
      var myTD=document.getElementById("mytd");
      myTD.rowSpan="2";
}
</script>
<button onclick=changeRowColor()>change mytd rowspan to 2</button>



<script>
function changeRowColor2()
{
      var myTD=document.getElementById("mytd");
      myTD.setAttribute("rowSpan","1");
}
</script>
<button onclick=changeRowColor2()>change mytd rowspan to 1</button>
0
devicCommented:
@ Zontar

rowspan and rowSpan is not the same ;)
0
ZontarCommented:
> rowspan and rowSpan is not the same

I'm aware of this, which is why I pointed out the difference in usage.

Attribute name: rowspan
Property name: rowSpan

Just as I said:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<title>Add & Delete Cells / Change Colspan Example</title>

<style type="text/css">
  body {font-size:1.5em;}
  p {cursor:pointer; margin:.45em;}
  p:hover {color:red;}
</style>

<script type="text/javascript">

function changeSpan(upOrDown)
{
  var tblMain = document.getElementById("tblmain");
  var firstRow = tblMain.getElementsByTagName("tr")[0];
  var firstCell = firstRow.getElementsByTagName("th")[0];

  currRowSpan = firstCell.getAttribute("rowspan") - 0; //  "rowspan" with a lowercase "s" when used with getAttribute() or setAttribute()

  if(upOrDown == 1)
    firstCell.rowSpan = (currRowSpan + 1) + "";  //  "rowSpan" with a capital "S" when accessed directly as a property
  else
    firstCell.rowSpan = (currRowSpan - 1) + "";
}

function removeCell(row, cell)
{
  row.removeChild(cell);
}

function remove()
{
  var tbody = document.getElementById("tblmain").getElementsByTagName("tbody")[0];
  var rows = tbody.getElementsByTagName("tr");

  if(rows.length == 1)
  {
    alert("That's the last row there, matey.\nDon't be a mongchop.");
    return;
  }

  var row = rows[rows.length - 1];

  tbody.removeChild(row);
  changeSpan(0);
}

function add()
{
  var tbody = document.getElementById("tblmain").getElementsByTagName("tbody")[0];
  var rows = tbody.getElementsByTagName("tr");

  var newRow = document.createElement("tr");
  var newCell = document.createElement("td");
  newCell.appendChild( document.createTextNode(rows.length + 1 + "") );

  newRow.appendChild(newCell);
  tbody.appendChild(newRow);
  changeSpan(1);
}

window.onload
  = function()
    {
      document.getElementById("addP").onclick = add;
      document.getElementById("removeP").onclick = remove;
    };

</script>

</head>
<body>

<table border="1" id="tblmain" cellpadding="5" cellspacing="0">
  <tbody>
    <tr>
      <th rowspan="8">Header</th><td>1</td>
    </tr>
    <tr>
      <td>2</td>
    </tr>
    <tr>
      <td>3</td>
    </tr>
    <tr>
      <td>4</td>
    </tr>
    <tr>
      <td>5</td>
    </tr>
    <tr>
      <td>6</td>
    </tr>
    <tr>
      <td>7</td>
    </tr>
    <tr>
      <td>8</td>
    </tr>
  </tbody>
</table>
<p id="addP">Click here to add.</p>
<p id="removeP">Click here to remove.</p>

</body>
</html>
0

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ZontarCommented:
Oh, stupid bloody MSIE...

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<title>Add & Delete Cells / Change Colspan Example</title>

<style type="text/css">
  body {font-size:1.5em;}
  p {cursor:pointer; margin:.45em;}
  p:hover {color:red;}
</style>

<script type="text/javascript">

function changeSpan(upOrDown)
{
  var tblMain = document.getElementById("tblmain");
  var firstRow = tblMain.getElementsByTagName("tr")[0];
  var firstCell = firstRow.getElementsByTagName("th")[0];

  currRowSpan = firstCell.getAttribute("rowspan") - 0;

  if(upOrDown == 1)
    firstCell.rowSpan = (currRowSpan + 1) + "";
  else
    firstCell.rowSpan = (currRowSpan - 1) + "";
}

function remove()
{
  var tbody = document.getElementById("tblmain").getElementsByTagName("tbody")[0];
  var rows = tbody.getElementsByTagName("tr");

  if(rows.length == 1)
  {
    alert("That's the last row there, matey.\nDon't be a mongchop.");
    return;
  }

  var row = rows[rows.length - 1];
  changeSpan(0);

  tbody.removeChild(row);
}

function add()
{
  var tbody = document.getElementById("tblmain").getElementsByTagName("tbody")[0];
  var rows = tbody.getElementsByTagName("tr");

  var newRow = document.createElement("tr");
  var newCell = document.createElement("td");
  newCell.appendChild( document.createTextNode(rows.length + 1 + "") );

  newRow.appendChild(newCell);
  tbody.appendChild(newRow);
  changeSpan(1);
}

window.onload
  = function()
    {
      document.getElementById("addP").onclick = add;
      document.getElementById("removeP").onclick = remove;
    };

</script>

</head>
<body>

<table border="1" id="tblmain" cellpadding="5" cellspacing="0">
  <tbody>
    <tr>
      <th rowspan="8">Header</th><td>1</td>
    </tr>
    <tr>
      <td>2</td>
    </tr>
    <tr>
      <td>3</td>
    </tr>
    <tr>
      <td>4</td>
    </tr>
    <tr>
      <td>5</td>
    </tr>
    <tr>
      <td>6</td>
    </tr>
    <tr>
      <td>7</td>
    </tr>
    <tr>
      <td>8</td>
    </tr>
  </tbody>
</table>
<p id="addP">Click here to add.</p>
<p id="removeP">Click here to remove.</p>

</body>
</html>
0
devicCommented:
@ Zontar

to match calculation:
=========================
currRowSpan = firstCell.getAttribute("rowspan") - 0;

 if(upOrDown == 1)
   firstCell.rowSpan = (currRowSpan + 1) + "";
 else
   firstCell.rowSpan = (currRowSpan - 1) + "";
}

short way:
==========================
 if(upOrDown == 1)
   firstCell.rowSpan ++;
 else
   firstCell.rowSpan --;
0
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