for javascript : webappData.getAttribute('data-id'); document.querySelector('#elementId').dataset.id = 'value'; for jquery : $(element).attr('data-key', 'value');
//html file Hello ! //js file const user = document.getElementById('user') console.log(user.dataset.userId) // => 2 console.log(user.dataset.userDateOfBirth) // => '03/03/1993'
Hello !