A data-* attribute on a <li> tag attaches additional data to the list item.
To create a custom attribute, replace * with a lowercase string, such as data-id, data-status, or data-location.
A custom data-salary attribute on a list item.
The attribute value is not visible.
<ol>
<li data-salary="$3,193">Designers</li>
<li data-salary="$76,404">Developers</li>
<li data-salary="$86,139">Managers</li>
</ol>
The data-* attribute adds custom information to an <li> element.
The * part is replaced with a lowercase string, such as data-id, data-cost, or data-location.
An <li> 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 li.
<li 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-salary attribute on three <li> tags.
Clicking an item will display the salary value.
<ol>
<li data-salary="$63,193" onclick="show(this);">Designers</li>
<li data-salary="$76,404" onclick="show(this);">Developers</li>
<li data-salary="$86,139" onclick="show(this);">Managers</li>
</ol>
<script>
let show = element => {
alert("Salary = " + element.getAttribute('data-salary'));
}
</script>
Three list items are created using the <li> tag.
Each has a custom data-salary attribute that indicates the salary for each job position.
Clicks are handled by the onclick event.
Onclick invokes a JavaScript function that extracts and displays the list item salary.
Note: Notice how the salary displays immediately without server call.
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 |
