JAVASCRIPT

classname toggle js

document.getElementById('myButton').onclick = function() {
    this.classList.toggle('active');
}

toggle css class in javascript

/* var or const followed by its name */.getElementById(/* HTML element ID */);
/* var or const's name */.classList.toggle(/* Name of CSS class */);
// I hope this helps! 

js toggle class

   element.classList.toggle('class');

classname toggle js

document.getElementById('myButton').onclick = function() {

    var className = ' ' + myButton.className + ' ';

    if ( ~className.indexOf(' active ') ) {
        this.className = className.replace(' active ', ' ');
    } else {
        this.className += ' active';
    }              
}