1var element = document.querySelector('.element');
2var dataAttribute = element.getAttribute('data-name');
3// replace "data-name" with your data attribute name
4
5console.log(dataAttribute);

1//get data-id attribute in plain Javascript
2var element = document.getElementById('myDivID');
3var dataID = element.getAttribute('data-id');
4
5//get data-id using jQuery
6var dataID = $('myDivID').data('data-id');
7

1//javascript get html data attribute
2<button data-id="1" >Click</button>
3<button data-id="2" >Click</button>
4<button data-id="3" >Click</button>
5const btns=document.querySelectorAll('button[data-id]');
6[...btns].forEach(btn => console.log(btn.getAttribute('data-id')))

1document.querySelectorAll('[data-foo]');
2

1// <div id="element" data-name="john"></div>
2
3const el = document.querySelector('#element')
4el.dataset.name // 'john'

1Get data attribute