Product.js

    componentDidMount() {
        window.addEventListener('scroll', this.throttleGoogleAdScroll());
    }

    throttleGoogleAdScroll() {
        // listen and throttle the scroll every second at start and end of scroll
        return _throttle(this.handleShowGoogleAdsense,
            1000,
            { trailing: true, leading: true }
        );
    }

    handleShowGoogleAdsense() {
        // check trigger element exists
        if (document.getElementById('adsTrigger')) {
            const adsTriggerScrollPosition = document.getElementById('adsTrigger').getBoundingClientRect().top;
            // fire the action when the trigger is within 100px of the bottom of screen
            if (__CLIENT__ && (adsTriggerScrollPosition) <= (window.innerHeight + 100)) {
                this.props.onShowGoogleAdSense();
                // stop listening after ads are shown
                if (this.props.shouldShowGoogleAdSense) {
                    window.removeEventListener('scroll', this.throttleGoogleAdScroll());
                }
            }
        }
    }