abp-blazor

---
name: abp-blazor
description: ABP Blazor UI patterns - AbpComponentBase, AbpCrudPageBase, DataGrid, IMenuContributor, Message/Notify, Validations, JavaScript interop. Use when building or reviewing Blazor Server or WebAssembly UI components in ABP projects.
---

# ABP Blazor UI

> **Docs**: https://abp.io/docs/latest/framework/ui/blazor/overall

## Component Base Classes

### Basic Component
```razor
@inherits AbpComponentBase

<h1>@L["Books"]</h1>
```

### CRUD Page
```razor
@page "/books"
@inherits AbpCrudPageBase<IBookAppService, BookDto, Guid, PagedAndSortedResultRequestDto, CreateUpdateBookDto>

<Card>
    <CardHeader>
        <Row>
            <Column>
                <h2>@L["Books"]</h2>
            </Column>
            <Column TextAlignment="TextAlignment.End">
                @if (HasCreatePermission)
                {
                    <Button Color="Color.Primary" Clicked="OpenCreateModalAsync">
                        @L["NewBook"]
                    </Button>
                }
            </Column>
        </Row>
    </CardHeader>
    <CardBody>
        <DataGrid TItem="BookDto"
                  Data="Entities"
                  ReadData="OnDataGridReadAsync"
                  TotalItems="TotalCount"
                  ShowPager="true"
                  PageSize="PageSize">
            <DataGridColumns>
                <DataGridColumn Field="@nameof(BookDto.Name)" Caption="@L["Name"]" />
                <DataGridColumn Field="@nameof(BookDto.Price)" Caption="@L["Price"]" />
                <DataGridEntityActionsColumn TItem="BookDto">
                    <DisplayTemplate>
                        <EntityActions TItem="BookDto">
                            <EntityAction TItem="BookDto"
                                          Text="@L["Edit"]"
                                          Visible="HasUpdatePermission"
                                          Clicked="() => OpenEditModalAsync(context)" />
                            <EntityAction TItem="BookDto"
                                          Text="@L["Delete"]"
                                          Visible="HasDeletePermission"
                                          Clicked="() => DeleteEntityAsync(context)"
                                          ConfirmationMessage="() => GetDeleteConfirmationMessage(context)" />
                        </EntityActions>
                    </DisplayTemplate>
                </DataGridEntityActionsColumn>
            </DataGridColumns>
        </DataGrid>
    </CardBody>
</Card>
```

## Localization
```razor
@* Using L property from base class *@
<h1>@L["PageTitle"]</h1>

@* With parameters *@
<p>@L["WelcomeMessage", CurrentUser.UserName]</p>
```

## Authorization
```razor
@* Check permission before rendering *@
@if (await AuthorizationService.IsGrantedAsync("MyPermission"))
{
    <Button>Admin Action</Button>
}

@* Using policy-based authorization *@
<AuthorizeView Policy="MyPolicy">
    <Authorized>
        <p>You have access!</p>
    </Authorized>
</AuthorizeView>
```

## Navigation & Menu
Configure in `*MenuContributor.cs`:

```csharp
public class MyMenuContributor : IMenuContributor
{
    public async Task ConfigureMenuAsync(MenuConfigurationContext context)
    {
        if (context.Menu.Name == StandardMenus.Main)
        {
            var bookMenu = new ApplicationMenuItem(
                "Books",
                l["Menu:Books"],
                "/books",
                icon: "fa fa-book"
            );

            if (await context.IsGrantedAsync(MyPermissions.Books.Default))
            {
                context.Menu.AddItem(bookMenu);
            }
        }
    }
}
```

## Notifications & Messages
```csharp
// Success message
await Message.Success(L["BookCreatedSuccessfully"]);

// Confirmation dialog
if (await Message.Confirm(L["AreYouSure"]))
{
    // User confirmed
}

// Toast notification
await Notify.Success(L["OperationCompleted"]);
```

## Forms & Validation
```razor
<Form @ref="CreateForm">
    <Validations @ref="CreateValidationsRef" Model="@NewEntity" ValidateOnLoad="false">
        <Validation MessageLocalizer="@LH.Localize">
            <Field>
                <FieldLabel>@L["Name"]</FieldLabel>
                <TextEdit @bind-Text="@NewEntity.Name">
                    <Feedback>
                        <ValidationError />
                    </Feedback>
                </TextEdit>
            </Field>
        </Validation>
    </Validations>
</Form>
```

## JavaScript Interop
```csharp
@inject IJSRuntime JsRuntime

@code {
    private async Task CallJavaScript()
    {
        await JsRuntime.InvokeVoidAsync("myFunction", arg1, arg2);
        var result = await JsRuntime.InvokeAsync<string>("myFunctionWithReturn");
    }
}
```

## State Management
```csharp
// Inject service proxy from HttpApi.Client
@inject IBookAppService BookAppService

@code {
    private List<BookDto> Books { get; set; }

    protected override async Task OnInitializedAsync()
    {
        var result = await BookAppService.GetListAsync(new PagedAndSortedResultRequestDto());
        Books = result.Items.ToList();
    }
}
```

## Code-Behind Pattern
**Books.razor:**
```razor
@page "/books"
@inherits BooksBase
```

**Books.razor.cs:**
```csharp
public partial class Books : BooksBase
{
    // Component logic here
}
```

**BooksBase.cs:**
```csharp
public abstract class BooksBase : AbpComponentBase
{
    [Inject]
    protected IBookAppService BookAppService { get; set; }
}
```