Javascript DOM HTML Column span Property get

Introduction

Return the number of columns a <col> element should span: 

var x = document.getElementById("myCol").span;

Click the button to return the value of the span attribute of the column.

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<!DOCTYPE html>
<html>
<head>
<style>
table, th, td {
  border: 1px solid black;
}
</style>/*from  ww  w  .j av a2  s . com*/
</head>
<body>

<table>
  <colgroup>
    <col id="myCol" span="2" style="background-color:red">
    <col style="background-color:yellow">
  </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>
<p id="demo"></p>

<button onclick="myFunction()">Test</button>

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

</body>
</html>



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