function initMap(){
var isDraggable = $(document).width() > 480 ? true : false; // If document (your website) is wider than 480px, isDraggable = true, else isDraggable = false
var mapOptions = {
draggable: isDraggable,
scrollwheel: false, // Prevent users to start zooming the map when scrolling down the page
//... options options options
};
}
Source: https://coderwall.com/p/pgm8xa/disable-google-maps-scrolling-on-mobile-layout