Ajaxa

$(function (){
            $("#getmap").click(function () {
                $.ajax({
                    method:"post",
                    url: "https://ewserver.di.unimi.it/mobicomp/mostri/getmap.php",
                    data: JSON.stringify({session_id : 'zqfQaL0q6TKACDrP'}),
                    type: "POST",
                    dataType : "json",
                    success: function (result) {
                        console.log(result);
                    },
                    error: function (error) {
                        alert( "Sorry, there was a problem!" );
                        console.log( "Error: " + errorThrown );
                    },
                })
            })
        });