var address ="<%= params[:search] %>";
var lat;
var lng;
var geocoder = new google.maps.Geocoder();

new Promise((resolve, reject) => {
geocoder.geocode( { 'address': address}, function(results, status) {
    lat = results[0].geometry.location.lat();
    lng = results[0].geometry.location.lng();
    resolve({lat: lat, lng: lng});
}));
}).then((data) => {
    alert(data);
});