.addClass() / .removeClass() / .toggleClass()
method
Add, remove, or toggle CSS classes on selected elements.
Syntax
$(selector).addClass(className)
Example
javascript
$('#btn').addClass('active');
$('#btn').removeClass('disabled');
$('#menu').toggleClass('open');
// Check if has class
if ($('#nav').hasClass('sticky')) {
console.log('Sticky nav');
}
// Multiple classes
$('.card').addClass('shadow rounded');
// Toggle based on condition
$('#theme').toggleClass('dark', isDarkMode);