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87 lines
3.5 KiB
87 lines
3.5 KiB
# Blazor UI: Customization / Overriding Components
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This document explains how to override the user interface of a depended [application module](../../Modules/Index.md) or [theme](Theming.md) for Blazor applications.
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## Overriding a Razor Component
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The ABP Framework, pre-built themes and modules define some **re-usable razor components and pages**. These pages and components can be replaced by your application or module.
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> Since pages are just the razor components, the same principle is valid for pages too.
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### Example: Replacing the Branding Area
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The screenshot below was taken from the [Basic Theme](Basic-Theme.md) comes with the application startup template.
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The [Basic Theme](Basic-Theme.md) defines some razor components for the layout. For example, the highlighted area with the red rectangle above is called *Branding* component. You probably want to customize this component by adding your **own application logo**. Let's see how to do it.
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First, create your logo and place under a folder in your web application. We used `wwwroot/bookstore-logo.png` path:
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The next step is to create a razor component, like `MyBlazor.razor`, in your application:
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The content of the `MyBlazor.razor` is shown below:
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````html
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@using Volo.Abp.DependencyInjection
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@using Volo.Abp.AspNetCore.Components.WebAssembly.BasicTheme.Themes.Basic
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@inherits Branding
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@attribute [ExposeServices(typeof(Branding))]
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@attribute [Dependency(ReplaceServices = true)]
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<a href="/">
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<img src="bookstore-logo.png" width="250" height="60"/>
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</a>
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````
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Let's explain the code:
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* `@inherits Branding` line inherits the Branding component defined by the [Basic Theme](Basic-Theme.md) (in the `Volo.Abp.AspNetCore.Components.WebAssembly.BasicTheme.Themes.Basic` namespace).
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* `@attribute [ExposeServices(typeof(Branding))]` registers this service (component) to [dependency injection](../../Dependency-Injection.md) for the `Branding` service (component).
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* `@attribute [Dependency(ReplaceServices = true)]` replaces the `Branding` class (component) with this new `MyBranding` class (component).
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* The rest of the code is related the content and styling of the component.
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Now, you can run the application to see the result:
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> Since the component inherits from the component it is replacing, you can use all the non-private fields/properties/methods of the base component in the derived component.
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### Example: Replacing with the Code Behind File
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If you prefer to use code-behind file for the C# code of your component, you can use the attributes in the C# side.
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**MyBlazor.razor**
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````html
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@using Volo.Abp.AspNetCore.Components.WebAssembly.BasicTheme.Themes.Basic
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@inherits Branding
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<a href="/">
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<img src="bookstore-logo.png" width="250" height="60"/>
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</a>
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````
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**MyBlazor.razor.cs**
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````csharp
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using Volo.Abp.AspNetCore.Components.WebAssembly.BasicTheme.Themes.Basic;
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using Volo.Abp.DependencyInjection;
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namespace MyProject.Blazor.Components
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{
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[ExposeServices(typeof(Branding))]
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[Dependency(ReplaceServices = true)]
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public partial class MyBranding
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{
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}
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}
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````
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## Theming
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The [Theming](Theming.md) system allows you to build your own theme. You can create your theme from scratch or get the [Basic Theme](Basic-Theme.md) and change however you like.
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