Smopp_v2/objectdateadd.js

$(document).ready(function() {
    $("#dateadd").click(function() {

        var machine = $("#machine").val();
        var dateadd = $("#dateadd").val();
        var calendar = $("#calendar").val();
        var dateevent = $("#dateevent").val();
        $.ajax({

            type: 'POST',
            url: 'objectevent.php',

            data: {calendar:calendar, machine:machine, dateadd:dateadd, dateevent:dateevent},
            success: function (msg) {
                $('#message1').html(msg);
            }
        });
    });
});