A data-* attribute on a <select> tag attaches additional data to the dropdown control.
To create a custom attribute, replace * with a lowercase string, such as data-id, data-status, or data-location.
A custom data-label attribute on a <select> element.
The attribute value is not visible, but it is readable by JavaScript.
<select data-label="Options for city">
<option value="">-- Select city -- </option>
<option value="paris">Paris</option>
<option value="london">London</option>
<option value="athens">Athens</option>
<option value="madrid">Madrid</option>
</select>
The data-* attribute adds custom information to a <select> element.
The * part is replaced with a lowercase string, such as data-id, data-cost, or data-location.
An <select> 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 select.
<select 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-content attribute on a <select> element.
Clicking the button will display content value.
<select id="myselect" data-content="Cities in Europe">
<option value="">-- Select city -- </option>
<option value="paris">Paris</option>
<option value="london">London</option>
<option value="athens">Athens</option>
<option value="madrid">Madrid</option>
</select>
<br/><br/>
<button onclick="show();">Show data</button>
<script>
let show = () => {
let element = document.getElementById("myselect");
alert("Content = " + element.getAttribute('data-content'));
}
</script>
The <select> tag has a custom data-content attribute.
The data-content attribute stores the description of the <select>.
Clicks are handled by the onclick event.
Onclick invokes a JavaScript function that extracts and displays the <select> content.
Note: Notice how the label 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 |
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