js get data attribute

// <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);

//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');

<article
  id="voitureelectrique"
  data-columns="3"
  data-index-number="12314"
  data-parent="voitures">
...
</article>
var article = document.getElementById('voitureelectrique');
 
article.dataset.columns // "3"
article.dataset.indexNumber // "12314"
article.dataset.parent // "voitures"

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