session - cakephp issue

    $("input.submit-btn").click(function(event) {
        event.preventDefault();

        var formData = $(this).parents('form').serialize();
        //console.log(formData);
        var url = "participants/ajax_index";

        $.post(url, {
            //data: formData
            data: formData
        }, function(data) {


            if (data == 1){
                share();
                $("#vote_container").remove();
                $("#thank_you_msg").show();
            }
            else{
                 alert(data);
            }


        }, "html")
        .done(function() {
            console.info("second success");

         })
        .fail(function(data) {
            alert('fail');})
        .always(function() { console.info("finished"); });

    });