HTML Element: <colgroup>
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The HTML <colgroup> element specifies a
group of one or more columns in a table. It can be used
to apply styles to entire columns in a table. It must be a child of a <table>
element, positioned after any <caption>
elements and before any <tbody>,
<tfoot>, <thead> and <tr> elements. If
you want to define different styles to column within the column group then use
the <col>
element.
The attributes it can take (other
than HTML global
attributes and HTML
event attributes) include:
|
Attribute
|
Description
|
More
|
|
span
|
Number of columns to
span
|
Here
|
To create or access such
an element in JavaScript
see here. The
corresponding HTML DOM
object supports standard
DOM properties and methods, and additional properties with the same name and
meaning as the attributes of the underlying HTML element referred to above. The
default style applicable to this element is shown here.
EXAMPLE:
HTML USED IN THIS EXAMPLE:
<!DOCTYPE html>
<html> <!-- Copyright (c) Nematrian Limited 2018 -->
<head>
<style>
table, th, td {border: 1px solid black; border-collapse: collapse;}
</style>
</head>
<body>
Created using HTML:<br>
<table>
<colgroup>
<col span="2" style="background-color: yellow">
<col style="background-color: orange">
</colgroup>
<tr><td>1</td><td>2</td><td>3</td></tr>
</table>
<br><br>Created using JavaScript:<br>
<table id="tbl">
<tr><td>1</td><td>2</td><td>3</td></tr>
</table>
<script>
var x = document.createElement("COLGROUP");
var x1 = document.createElement("COL");
var x2 = document.createElement("COL");
x1.setAttribute("span","2");
x1.setAttribute("style","background-color: yellow");
x2.setAttribute("style","background-color: orange");
x.appendChild(x1); x.appendChild(x2);
document.getElementById("tbl").appendChild(x);
</script>
</body>
</html>
|
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