HTML <input> data-* Attribute

HTML <img>

HTML <ins>

A data-* attribute on an <input> tag attaches additional data to the input element.

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-price attribute on each checkbox.
The attribute values are not visible, but they are readable by JavaScript.

Product 1
Product 2
Product 3

<input type="checkbox" value="Product 1" data-price="$4.99"> Product 1<br />
<input type="checkbox" value="Product 2" data-price="$8.04"> Product 2<br />
<input type="checkbox" value="Product 3" data-price="$2.77"> Product 3

Using data-*

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The data-* attribute allows you to add custom attributes to a <input> element.

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

An <input> element can have any number of data-* attributes, each with their own name.

These attributes usually store additional data about the input (e.g. id, options, variations, etc.).

Using data-* attributes reduces the need for Ajax requests to the server.

Note: The data-* attribute does not change the appearance of the input tag in any way.

Syntax

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<input 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-price attribute of each of the three checkbox elements.
Clicking a checkbox will display the price value.

Product 1
Product 2
Product 3

<input type="checkbox" value="Product 1" data-price="$4.99"  onclick="show(this);"> Product 1<br />
<input type="checkbox" value="Product 2" data-price="$8.04" onclick="show(this);"> Product 2<br />
<input type="checkbox" value="Product 3" data-price="$2.77" onclick="show(this);"> Product 3

<script>
  let show = element => {
    alert("Price = " + element.getAttribute('data-price'));
  }
</script>

Code explanation

The <input> tag below contains a custom data-price attribute.

The data-price attribute specifies the price of the product.

Clicks are handled by the onclick event.

Onclick invokes a JavaScript function that extracts and displays the checkbox <input> price.

Note: Notice how each price displays immediately without server call.

Browser support

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