Javascript DOM HTML ColumnGroup Object get

Introduction

The ColumnGroup object represents an HTML <colgroup> element.

We can access a <colgroup> element via document.getElementById(): 

var x = document.getElementById("myColgroup");

Click the button to get the number of columns a COLGROUP element should span.

View in separate window 

<!DOCTYPE html>
<html>
<head>
<style>
table, th, td {
  border: 1px solid black;
}
</style>//from  w ww  .ja  v  a2 s .c  om
</head>
<body>
<table>
  <colgroup id="myColgroup" span="2" style="background:red"></colgroup>
  <tr><th>ISBN</th>   <th>Title</th>    <th>Price</th></tr>
  <tr><td>101</td>    <td>HTML</td>     <td>$5</td></tr>
  <tr><td>102</td>    <td>CSS</td>      <td>$4</td></tr>
</table>
<button onclick="myFunction()">Test</button>

<p id="demo"></p>

<script>
function myFunction() {
  var x = document.getElementById("myColgroup").span;
  document.getElementById("demo").innerHTML = x;
}
</script>

</body>
</html>



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