data-attribute-vanilla-javascript

data-attribute-vanilla-javascript.js

function printAge(studentId) {
            // Get the <li> which is clicked
            let studentListItem = document.querySelector(`[data-id="${studentId}"]`);
            // Get the age from the data attribute 'age'
            let age = studentListItem.dataset.age;
            // Finally log it to console, Duh !
            console.log('Age of the clicked student is ', age);
        }