Custom data attributes html

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);

Javascript get data attribute value

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

Source: developer.mozilla.org

Custom data attributes html

<div data-myvar="hello world"</div>
<script>
 //Note: attribute in html will force lowercase, make sure all letters are lower
  var element = document.querySelector("div");
  console.log(element.dataset.myvar);
  //outputs: hello world
</script>

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