对于空文本框的jQuery验证，以及焦点，如果验证错误结果则禁用按钮

Question

我有更多jQuery Validation ajax。现在我想做一些验证：

1. 如果所有文本框都为空，则禁用该按钮。
2. 如果在对数据库进行验证时为false，则将焦点文本框并禁用该按钮。

我为此进行了jQuery验证的代码，如下所示：

$("#button_submit").attr("disabled", "true");
$("#accessories_sheet").keyup(function()
        {
            var accessories_sheet = $("#accessories_sheet").val();
            var acc_no = $("#acc_no").val();
            var revision = $("#revision").val();
            var combine_part = $("#combine_part").val();

            if(accessories_sheet.length >= 16)
            {
                $("#status_acc").html('<div class="pos_loader">Processing...</div>');

                $.ajax(
                {  
                    type: "POST",  
                    url: "check_accs.php",  
                    data: 'accessories_sheet='+ accessories_sheet +'&acc_no='+ acc_no +'&revision='+ revision +'&combine_part='+ combine_part,
                    success: function(msg)
                    {  
                        $("#status_acc").ajaxComplete(function(event, request, settings)
                        { 
                            if(msg == 'OK')
                            { 
                                $("#accessories_sheet").removeClass('object_error'); // if necessary
                                $("#accessories_sheet").addClass("object_ok");
                                $(this).html('<div class="notify success">OK</div>');
                                $("#box_pn").focus();
                            }
                            else  
                            {  
                                $("#accessories_sheet").removeClass('object_ok'); // if necessary
                                $("#accessories_sheet").addClass("object_error");
                                $(this).html(msg);
                                $("#accessories_sheet").focus();
                                $("#accessories_sheet").select();
                                $('#button_submit').attr("disabled", true);
                            }  

                        });
                    } 
                }); 
            }
            else
            {
                $("#status_acc").html('<div class="notify errors">Accessories sheet length is 16 characters.</div>');
                $("#accessories_sheet").removeClass('object_ok');
                $("#accessories_sheet").addClass("object_error");
            }
        });

        $("#box_pn").keyup(function()
        {
            var box_pn = $("#box_pn").val();
            var combine_part = $("#combine_part").val();
            var revision = $("#revision").val();

            if(box_pn.length >= 12)
            {
                $("#status_box_pn").html('<div class="pos_loader">Processing...</div>');

                $.ajax(
                {  
                    type: "POST",  
                    url: "check_box_pn.php",  
                    data: 'box_pn='+ box_pn +'&combine_part='+ combine_part +'&revision='+ revision,
                    success: function(msg)
                    {  
                        $("#status_box_pn").ajaxComplete(function(event, request, settings)
                        { 
                            if(msg == 'OK')
                            { 
                                $("#box_pn").removeClass('object_error'); // if necessary
                                $("#box_pn").addClass("object_ok");
                                $(this).html('<div class="notify2 success">OK</div>');
                                $("#pack_label_pn").focus();
                            }
                            else  
                            {  
                                $("#box_pn").removeClass('object_ok'); // if necessary
                                $("#box_pn").addClass("object_error");
                                $(this).html(msg);
                                $("#box_pn").focus();
                                $("#box_pn").select();
                                $('#button_submit').attr("disabled", true);
                            }  

                        });
                    } 
                }); 
            }
            else
            {
                $("#status_box_pn").html('<div class="notify2 errors">Box P/N length is 12 characters.</div>');
                $("#box_pn").removeClass('object_ok');
                $("#box_pn").addClass("object_error");
            }
        });

和文本框的HTML如下：

<form action="" method="post" autocomplete="off">
<input type="text" name="accessories_sheet" class="input_2" maxlength="16" id="accessories_sheet" onkeyup="javascript:this.value=this.value.toUpperCase();"/>

<td><input type="text" name="box_pn" class="input_2" maxlength="12" id="box_pn" onkeyup="javascript:this.value=this.value.toUpperCase();"/></td>

<input type="submit" value="Submit" id="button_submit"/>

任何建议伙伴们？请，需要你的帮助。