extract custom parameter from html element javascript code example

Example 1: javascript get data-id attribute

//get data-id attribute in plain Javascript
var element = document.getElementById('myDivID');
var dataID = element.getAttribute('data-id');

//get data-id using jQuery
var dataID = $('myDivID').data('data-id');

Example 2: data attribute html

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