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SchengenVisaApi/BlazorWebAssemblyVisaApiClient/Components/FormComponents/Validation/CustomValidation.razor

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+<h3>CustomValidation</h3>
+
+@code {
+    private ValidationMessageStore? messageStore;
+
+    [CascadingParameter]
+    private EditContext? CurrentEditContext { get; set; }
+
+    protected override void OnInitialized()
+    {
+        if (CurrentEditContext is null)
+        {
+            throw new InvalidOperationException(
+                $"{nameof(CustomValidation)} requires a cascading " +
+                $"parameter of type {nameof(EditContext)}. " +
+                $"For example, you can use {nameof(CustomValidation)} " +
+                $"inside an {nameof(EditForm)}.");
+        }
+
+        messageStore = new(CurrentEditContext);
+
+        CurrentEditContext.OnValidationRequested += (_, _) =>
+            messageStore?.Clear();
+        CurrentEditContext.OnFieldChanged += (_, e) =>
+            messageStore?.Clear(e.FieldIdentifier);
+    }
+
+    public void DisplayErrors(Dictionary<string, List<string>> errors)
+    {
+        if (CurrentEditContext is not null)
+        {
+            foreach (var err in errors)
+            {
+                messageStore?.Add(CurrentEditContext.Field(err.Key), err.Value);
+            }
+
+            CurrentEditContext.NotifyValidationStateChanged();
+        }
+    }
+
+    public void ClearErrors()
+    {
+        messageStore?.Clear();
+        CurrentEditContext?.NotifyValidationStateChanged();
+    }
+}