how to use data attribute in javascript code example

Example 1: js get data attribute

var element = document.querySelector('.element');
var dataAttribute = element.getAttribute('data-name');
// replace "data-name" with your data attribute name

console.log(dataAttribute);

Example 2: get data attribute javascript

// <div id="element" data-name="john"></div>

const el = document.querySelector('#element')
el.dataset.name // 'john'

Example 3: data attribute html

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