The .data() method allows us to attach data of any type to DOM elements in a way that is safe from circular references and therefore from memory leaks.

We can set several distinct values for a single element and retrieve them later:

$( "body" ).data( "foo", 52 );
$( "body" ).data( "bar", { myType: "test", count: 40 } );
$( "body" ).data( { baz: [ 1, 2, 3 ] } );
$( "body" ).data( "foo" ); // 52
$( "body" ).data(); // { foo: 52, bar: { myType: "test", count: 40 }, baz: [ 1, 2, 3 ] }

In jQuery 1.4.3 setting an element's data object with .data(obj) extends the data previously stored with that element.

Prior to jQuery 1.4.3 (starting in jQuery 1.4) the .data() method completely replaced all data, instead of just extending the data object. If you are using third-party plugins it may not be advisable to completely replace the element's data object, since plugins may have also set data.

jQuery 3 changes the behavior of this method to align it to the Dataset API specifications. Specifically, jQuery 3 transforms every two-character sequence of "-" (U+002D) followed by a lowercase ASCII letter by the uppercase version of the letter as per definition of the algorithm of the Dataset API. Writing a statement like $( "body" ).data( { "my-name": "aValue" } ).data(); will return { myName: "aValue" }.

Due to the way browsers interact with plugins and external code, the .data() method cannot be used on <object> (unless it's a Flash plugin), <applet> or <embed> elements.

• Note that this method currently does not provide cross-platform support for setting data on XML documents, as Internet Explorer does not allow data to be attached via expando properties.
• undefined is not recognized as a data value. Calls such as .data( "name", undefined ) will return the jQuery object that it was called on, allowing for chaining.

The .data() method allows us to attach data of any type to DOM elements in a way that is safe from circular references and therefore from memory leaks. We can retrieve several distinct values for a single element one at a time, or as a set:

alert( $( "body" ).data( "foo" ) );
alert( $( "body" ).data() );

The above lines alert the data values that were set on the body element. If no data at all was set on that element, undefined is returned.

alert( $( "body" ).data( "foo" ) ); // undefined
$( "body" ).data( "bar", "foobar" );
alert( $( "body" ).data( "bar" ) ); // foobar

jQuery 3 changes the behavior of this method to align it to the Dataset API specifications. Specifically, jQuery 3 transforms every two-character sequence of "-" (U+002D) followed by a lowercase ASCII letter by the uppercase version of the letter as per definition of the algorithm of the Dataset API. Writing a statement like $( "body" ).data( { "my-name": "aValue" } ).data(); will return { myName: "aValue" }.

HTML5 data-* Attributes

As of jQuery 1.4.3 HTML 5 data- attributes will be automatically pulled in to jQuery's data object. The treatment of attributes with embedded dashes was changed in jQuery 1.6 to conform to the W3C HTML5 specification.

For example, given the following HTML:

<div data-role="page" data-last-value="43" data-hidden="true" data-options='{"name":"John"}'></div>

All of the following jQuery code will work.

$( "div" ).data( "role" ) === "page";
$( "div" ).data( "lastValue" ) === 43;
$( "div" ).data( "hidden" ) === true;
$( "div" ).data( "options" ).name === "John";

The second statement of the code above correctly refers to the data-last-value attribute of the element. In case no data is stored with the passed key, jQuery searches among the attributes of the element, converting a camel-cased string into a dashed string and then prepending data- to the result. So, the string lastValue is converted to data-last-value.

Every attempt is made to convert the string to a JavaScript value (this includes booleans, numbers, objects, arrays, and null). A value is only converted to a number if doing so doesn't change the value's representation. For example, "1E02" and "100.000" are equivalent as numbers (numeric value 100) but converting them would alter their representation so they are left as strings. The string value "100" is converted to the number 100.

When the data attribute is an object (starts with '{') or array (starts with '[') then jQuery.parseJSON is used to parse the string; it must follow valid JSON syntax including quoted property names. If the value isn't parseable as a JavaScript value, it is left as a string.

To retrieve the value's attribute as a string without any attempt to convert it, use the attr() method.

The data- attributes are pulled in the first time the data property is accessed and then are no longer accessed or mutated (all data values are then stored internally in jQuery).

Calling .data() with no parameters retrieves all of the values as a JavaScript object. This object can be safely cached in a variable as long as a new object is not set with .data(obj). Using the object directly to get or set values is faster than making individual calls to .data() to get or set each value:

var mydata = $( "#mydiv" ).data();
if ( mydata.count < 9 ) {
  mydata.count = 43;
  mydata.status = "embiggened";
}

• Note that this method currently does not provide cross-platform support for setting data on XML documents, as Internet Explorer does not allow data to be attached via expando properties.