JAVASCRIPT

jquery get option data attribute

$(this).find(':selected').data('id');

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)

jquery select by data attribute

$('div[data-key=value]');

find element with data attribute jquery

$("ul").find(`[data-slide='${current}']`)

jquery find by data attribute

$('.slide-link[data-slide="0"]').addClass('active');

jquery find div with data attribute value

$("body").find("[data-searchme='" + var_value + "']"); 

jquery get element by data attribute

$("ul[data-slide='" + current +"']");