fix送出後的顯示問題

Altob.NtuInvoiceGateway/Pages/Invoice.cshtml

@@ -176,15 +176,6 @@
             const successAlert = document.getElementById('formSuccessMessage');
             const submitButtonContainer = document.getElementById('submitButtonContainer');
 
-            const showError = (message) => {
-                if (!errorAlert || !errorText) {
-                    alert(message);
-                    return;
-                }
-                errorText.textContent = message;
-                errorAlert.classList.remove('d-none');
-            };
-
             const hideError = () => {
                 if (!errorAlert || !errorText) {
                     return;
@@ -195,13 +186,6 @@
 
             errorCloseBtn?.addEventListener('click', hideError);
 
-            const requiredGroup = [
-                document.querySelector('input[name="InvoiceData.Email"]'),
-                document.querySelector('input[name="InvoiceData.CarrierID"]'),
-                document.querySelector('input[name="InvoiceData.BuyerIdentifier"]'),
-                document.querySelector('select[name="InvoiceData.LoveCode"]')
-            ];
-
             const form = document.querySelector('form[method="post"]');
             if (!form) {
                 return;
@@ -234,13 +218,6 @@
                     return;
                 }
 
-                const hasValue = requiredGroup.some(field => field && field.value.trim() !== '');
-                if (!hasValue) {
-                    event.preventDefault();
-                    showError('Email、手機條碼、購買者統編、捐贈碼至少需填寫一項。');
-                    return;
-                }
-
                 hideError();
                 lockForm();
             });

Altob.NtuInvoiceGateway/Pages/Invoice.cshtml.cs

@@ -20,6 +20,7 @@ public class InvoiceModel : PageModel
     private readonly DonateCodeApiOptions _donateCodeApiOptions;
     private const string ServiceName = "NtuInvoiceGateway";
     private const string DonateCodeCacheKey = "DonateCodeList";
+    private const string InvoiceDataTempKey = "InvoiceFormData";
 
     public InvoiceModel(
         ILogger<InvoiceModel> logger,
@@ -52,11 +53,17 @@ public class InvoiceModel : PageModel
 
     public void OnGet()
     {
+        RestoreInvoiceDataFromTempData();
         RestoreDisplayValuesFromTempData();
         NormalizeInvoiceData();
         // 如果有 GET 參數，設置顯示資訊
         DisplayTransDateTime = InvoiceData.TransDateTime;
         DisplayTransAmount = InvoiceData.TransAmount;
+
+        if (!Request.Query.Any())
+        {
+            ModelState.Clear();
+        }
     }
 
     public async Task<IActionResult> OnGetDonateCodesAsync()
@@ -280,6 +287,7 @@ public class InvoiceModel : PageModel
                 SuccessMessage = "發票資訊送出成功！";
                 TempData[nameof(DisplayTransDateTime)] = DisplayTransDateTime;
                 TempData[nameof(DisplayTransAmount)] = DisplayTransAmount;
+                TempData[InvoiceDataTempKey] = JsonSerializer.Serialize(InvoiceData);
                 _logger.LogInformation("{ServiceName} - {ActionName} submitted successfully for OrderID: {OrderID}",
                     ServiceName, actionName, InvoiceData.OrderID);
                 return RedirectToPage();
@@ -337,4 +345,32 @@ public class InvoiceModel : PageModel
             DisplayTransAmount = amount;
         }
     }
+
+    private void RestoreInvoiceDataFromTempData()
+    {
+        if (!TempData.TryGetValue(InvoiceDataTempKey, out var invoiceDataObj) ||
+            invoiceDataObj is not string invoiceDataJson ||
+            string.IsNullOrWhiteSpace(invoiceDataJson))
+        {
+            return;
+        }
+
+        try
+        {
+            var restoredData = JsonSerializer.Deserialize<InvoiceRequest>(invoiceDataJson, new JsonSerializerOptions
+            {
+                PropertyNameCaseInsensitive = true
+            });
+
+            if (restoredData != null)
+            {
+                InvoiceData = restoredData;
+            }
+        }
+        catch (JsonException ex)
+        {
+            _logger.LogWarning(ex, "{ServiceName} - {ActionName} failed to restore invoice data from temp data",
+                ServiceName, nameof(RestoreInvoiceDataFromTempData));
+        }
+    }
 }