js get html writing of an attribute code example

Example 1: javascript get attribute

<div id="id_of_the_element" data-attribute_name="foo"></div>

var elem = document.getElementById("id_of_the_element");
var attribute_value = elem.getAttribute("data-attribute_name");

//OR with jquery...
var attribute_value = $('#id_of_the_element').attr('data-attribute_name');
//OR...
var attribute_value = $('#id_of_the_element').data('attribute_name');

Example 2: data attribute html

<!-- data-* attritubes can be used on any html element -->
<div data-my-custom-data="true"></div>