how to read data attribute in jquery code example

Example 1: jquery get data attribute value

/* html */
<a data-id="123">link</a>

/* js */
$(this).attr("data-id") // returns string "123"

$(this).data("id") // returns number 123 (jQuery >= 1.4.3 only)

Example 2: data id

<li data-id="1234" data-email="[email protected]" data-age="21">Calvin</li>