HTML <th> data-* Attribute

HTML <tfoot>

HTML <thead>

A data-* attribute on a <th> tag attaches additional data to the table header cell.

To create a custom attribute, replace * with a lowercase string, such as data-id, data-status, or data-location.

Example

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A custom data-title attribute on a <th> tag.
The attribute value is not visible, but is readable by JavaScript.

Full name
Denice	Hobermann
Paulo	Cornell

<style>
  table.tb { width: 250px; border-collapse: collapse; }
  .tb th, .tb td { border: solid 1px #777; padding: 5px; }
  .tb th { background-color:lightblue; text-align: center; }
</style>

<table class="tb">
  <tr>
    <th data-title="Customer full name" colspan="2">Full name</th>
  </tr>
  <tr>
    <td>Denice</td>
    <td>Hobermann</td>
  </tr>
  <tr>
    <td>Paulo</td>
    <td>Cornell</td>
  </tr>
</table>

Using data-*

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The data-* attribute adds custom information to a <th> element.

The * part is replaced with a lowercase string, such as data-id, data-cost, or data-location.

An <th> 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 th.

Syntax

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<th data-*="value">

Note: The * can be any string, such as data-id, data-cost, data-supplier, etc.

Values

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Value	Description
value	A string value. Can be numeric, alphanumeric, JSON, etc.

More Examples

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A custom data-title attribute on a <th> element.
Clicking the button will display the title value.

Customer
Denice	Hobermann
Paulo	Cornell

<style>
  table.tb { width: 250px; border-collapse: collapse; }
  .tb th, .tb td { border: solid 1px #777; padding: 5px; }
  .tb th { background-color:lightblue; text-align: center; }
</style>

<table class="tb">
  <tr>
    <th id="myth" data-title="Customer name" colspan="2">Customer</th>
  </tr>
  <tr>
    <td>Denice</td>
    <td>Hobermann</td>
  </tr>
  <tr>
    <td>Paulo</td>
    <td>Cornell</td>
  </tr>
</table>

<br/>
<button onclick="show();">Show data</button>

<script>
  let show = () => {
    let element = document.getElementById("myth");
    alert("Title = " + element.getAttribute('data-title'));
  }
</script>

Code explanation

The <th> tag has a custom data-title attribute.

The data-title attribute describes the content of the table header.

Clicks are handled by the onclick event.

Onclick invokes a JavaScript function that extracts and displays the <th> title.

Note: Notice how the title displays immediately without server call.

Browser support

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Here is when data-* support started for each browser: