javascript get data attribute value

//HTML
//<div id="elem" data-id="4hJ3s"></div>

var elem = document.getElementById("elem");
elem.getAttribute("data-id"); // "4hJ3s"

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

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

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

console.log(dataAttribute);

<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');

document.querySelectorAll('[data-foo="value"]');

const article = document.querySelector('#electric-cars');
 
article.dataset.columns // "3"
article.dataset.indexNumber // "12314"
article.dataset.parent // "cars"

//find first element with "someAttr" attribute
document.querySelector('[someAttr]')

//find all elements with "someAttr" attribute
document.querySelectorAll('[someAttr]')