A data-* attribute on a <col> tag attaches additional data to the col element.
To create a custom attribute, replace * with a lowercase string, such as data-id, data-status, or data-location.
A custom data-category attribute on a <col> tag.
The attribute value is not visible, but is readable by JavaScript.
| Id | First Name | Last Name | Country |
|---|---|---|---|
| ART-303 | Vincent | Van Gogh | Netherlands |
| ART-877 | Paul | Cézanne | France |
<style>
table.tb { width:100%; border-collapse: collapse; }
.tb th, .tb td { padding:3px; border: 1px solid #777; }
</style>
<table class="tb">
<colgroup>
<col data-category="ART">
<col span="3" style="background-color:aliceblue;">
</colgroup>
<tr>
<th>Id</th>
<th>First Name</th>
<th>Last Name</th>
<th>Country</th>
</tr>
<tr>
<td>ART-303</td>
<td>Vincent</td>
<td>Van Gogh</td>
<td>Netherlands</td>
</tr>
<tr>
<td>ART-877</td>
<td>Paul</td>
<td>Cézanne</td>
<td>France</td>
</tr>
</table>
The data-* attribute adds custom information to a <col> element.
The * part is replaced with a lowercase string, such as data-id, data-source, data-category, etc.
An <col> element can have any number of data-* attributes, each with their own name.
Using data-* attributes reduces the need for requests to the server.
Note: The data-* attribute is not visible and does not change the appearance of the table or col.
<col data-*="value">
Note: The * can be any string, such as data-id, data-cost, data-supplier, etc.
| Value | Description |
|---|---|
| value | A string value. Can be numeric, alphanumeric, JSON, etc. |
A custom data-category attribute on a <col> element.
Clicking the button will display the category value.
| Id | First Name | Last Name | Country |
|---|---|---|---|
| ART-303 | Vincent | Van Gogh | Netherlands |
| ART-877 | Paul | Cézanne | France |
<style>
table.tbl { width:100%; border-collapse: collapse; }
.tbl th, .tbl td { padding:3px; border: 1px solid #777; }
</style>
<table class="tbl">
<colgroup>
<col id="mycol" data-category="ART">
<col span="3" style="background-color:aliceblue;">
</colgroup>
<tr>
<th>Id</th>
<th>First Name</th>
<th>Last Name</th>
<th>Country</th>
</tr>
<tr>
<td>ART-303</td>
<td>Vincent</td>
<td>Van Gogh</td>
<td>Netherlands</td>
</tr>
<tr>
<td>ART-877</td>
<td>Paul</td>
<td>Cézanne</td>
<td>France</td>
</tr>
</table>
<br/>
<button onclick="show();">Show data</button>
<script>
let show = () => {
let element = document.getElementById("mycol");
alert("Category = " + element.getAttribute('data-category'));
}
</script>
The <col> tag contains a custom data-category attribute.
Button clicks are handled by the onclick event.
Onclick invokes a JavaScript function that extracts and displays the col category.
Here is when data-* support started for each browser:
 Chrome
|
1.0 | Sep 2008 |
 Firefox
|
1.0 | Sep 2002 |
 IE/Edge
|
1.0 | Aug 1995 |
 Opera
|
1.0 | Jan 2006 |
 Safari
|
1.0 | Jan 2003 |
Back to <col>
