Validasi Form Upload Ajax

/* VALIDASI UNTUK FORM TEXTBOX DAN WORK SEPERTI EKSPETASINYA */

function tombol(){
    var NamaBarang = $('#Txt_Nama').val();

    if(save_method == 'add'){
        url = site + "barang/simpan";
    }else{
        url = site + "barang/update";
    }

    $.ajax({
        url         : url,
        type        : "POST",
        data        : $('#form').serialize(),
        dataType    : "JSON",
        success     : function(data){
            if (data.success == true) {
                $('.text-message').append('<div class="alert alert-success"><i class="fa fa-check"></i> Data <b>'+ data.result.Txt_Nama +'</b> has been saved</div>');
                $('.form-group').removeClass('has-error')
                                .removeClass('has-success');
                $('.help-block').remove();

                $('.alert').delay(500).show(10, function(){
                    $(this).delay(3000).hide(10, function(){
                        $(this).remove();
                    });
                });

                tampil_data();
                pageNormal();
            }else{
                $.each(data.messages, function(key, value){
                    var element = $('#'+key);
                    element.closest('div.form-group')
                    .removeClass('has-success')
                    .removeClass('has-error')
                    .addClass(value.length > 0 ? 'has-error' : 'has-success')
                    .find('.help-block').remove();
                    element.after(value);
                });
            }
        },
        error       : function (jqXHR, textStatus, errorThrown){
            alert('Error adding / update data');
        }
    });
}


/* VALIDASI UNTUK FORM UPLOAD TIDAK WORK */
/* Bagaimana solusinya? Mohon pencerahannya */

$(document).ready(function(){
                $('#upload_file').on('submit', function(e){
                    e.preventDefault();

                    /*if($('#Txt_File').val() == ''){
                        alert("Please Select the File");
                    }else{*/
                        $.ajax({
                            url         : site + 'upload/aksi_upload',
                            method      : "POST",
                            data        : new FormData(this),
                            contentType : false,
                            cache       : false,
                            processData : false,
                            success     : function(data){
                                if (data.status == true) {
                                    $('.text-message').append('<div class="alert alert-success"><i class="fa fa-check"></i> Data <b>'+ data.result.file_name +'</b> has been saved</div>');
                                    $('.form-group').removeClass('has-error')
                                                    .removeClass('has-success');

                                    $('.alert').delay(500).show(10, function(){
                                        $(this).delay(3000).hide(10, function(){
                                            $(this).remove();
                                        });
                                    });
                                }else{
                                    $.each(data.messages, function(key, value){
                                        /*console.log(key);*/
                                        var element = $('#'+key);

                                        element.closest('div.form-group')
                                        .removeClass('has-success')
                                        .removeClass('has-error')
                                        .addClass(value.length > 0 ? 'has-error' : 'has-success')
                                        .find('.help-block').remove();

                                        element.after(value);
                                    });
                                }
                            }
                        });
                    // }
                });