Not close vex dialog on submit about vex HOT 2 CLOSED

var $vex = vex.dialog.alert({
    message: 'Message',
    onSubmit: function(e) {
        vex.showLoading();

        // Prevent dialog from closing now
        e.preventDefault();

        // Asychronously close this dialog
        // (uses `setTimeout`, but could be `$.ajax` instead)
        setTimeout(function(){
            vex.hideLoading();
            vex.close($vex.data().vex.id);
        }, 2000);
    }
});