从嵌套函数Jquery

Question

我有一个父函数，它包含一个ajax调用以及一个在ajax调用之前的验证函数。我想要实现的是显然首先运行验证函数，如果其中任何一个失败，则阻止进一步执行父函数。

因此，如果我返回null会停止进一步执行该函数，但是如何从子函数返回null以影响父函数呢？

子功能（验证）

function trrValidationError(ele, title, text) {
if ($(ele).val() === "") {
    if (title === null) {
         title = "Warning";
    }
    if (typeof text == "undefined") {
        text = "Input validation error!";
    }
    swal({
        title: title,
        text: text,
        type: "error"
    });
    return null;
}
}

家长功能

        EventAdd: function(ele) {
        var form = $(ele).closest("form")[0];
        var formData = new FormData(form);

        trrValidationError($("#webcms-events-description"),null,"Description field must not be empty!"));
        trrValidationError($("#StartDateTime"),null,"Start Date field must not be empty!"));
        trrValidationError($("#EndDateTime"),null,"End Date field must not be empty!"));

        if (trrConfirm("",
            "Are you sure you want to add a new event?",
            function() {
                $.ajax({
                        type: "POST",
                        data: formData,
                        url: $(ele).data("url"),
                        enctype: "multipart/form-data",
                        processData: false,
                        contentType: false
                    })
                    .done(function(response) {
                        swal({
                            text: "You have successfully added a new event!",
                            type: "success"
                        });

                        form.reset();
                        var newele = $("<div/>");
                        newele.html(response).contents().insertAfter($("#webcms-events-table-row"));
                    })
                    .fail(function(xhr, status, error) {
                        trrAlert(xhr.responseText);
                    });
            }));
    },