Simple on/off toggle Intersection Observer ES6 method

visibilityToggle.js

createObserver() {
    let intersectionObserver = new IntersectionObserver((entries) => { 
        if (entries[0].intersectionRatio <= 0) {
          
            //do something when hidden
            console.log('hidden');
        } else {        
            //do something when visible
            console.log('visible');
        }
    });

    intersectionObserver.observe(this.node);
}