Check for Window Orientation of mobile devices. Landscape and Portrait.

Check Orientation of Device

    window.addEventListener('orientationchange', checkPage);

    function checkPage(){
        switch(window.orientation){
            case 90:
                currentState = 'landscape';
            break;
            case 0:
                currentState = 'portrait';
            break;
        }
        console.log('change in oreintation', window.orientation, currentState);

    }