ajax form

            $('body').on('submit','#contact-form', function(event){
                event.preventDefault();

                var form = $(this);

                $.ajax({
                   'method': 'post', // use post since you use $_POST in php file to process data
                   'action': '/' + $(form).attr('action'), // url to send a form data
                   'data': $(form).serialize(), // serialized form data
                }).done(function(response){
                    // to do something with response text
                });

            });