For this a public property is declared and set in the backing class. If you want the button not to post-back, just set the button's autopostback property to false. The example below demonstrates how to pass antiforgery token when a Button is clicked. In the following example, the text optional parameter assigns the value of the route segment to the component's Text property. For the preceding HelloWorld component, you can add a NavLink component to the NavMenu component in the Shared folder. Leave the parameter property as an auto-property to represent the supplied raw data. As a result, exceptions aren't caught if void is returned. Additionally, we have to show some message on the Index razor page. For more information on change detection, including information on the exact types that Blazor checks, see ASP.NET Core Razor component rendering. This allows you to Play, Pause, Stop, Mute, Un-mute a music player. Components can specify route parameters in the route template of the @page directive. The Click event is raised when the Button control is clicked. Consider the following Heading component, which can be used by other components to display a heading. Component file paths use Pascal case and appear before showing component code examples. You're welcome to use it in production if it meets your needs, but it isn't officially supported and may change in future releases. However, we recommend using quotes because it's easier to remember and widely adopted across web-based technologies. The following example directly references the ProductDetail component in the Components folder of the app: The namespace of a component authored with Razor is based on the following (in priority order): Components are generated as C# partial classes and are authored using either of the following approaches: A component stylesheet that defines component-specific styles is a separate file (.css). How to register multiple implementations of the same interface in Asp.Net Core? Providing initial values for component parameters is supported, but don't create a component that writes to its own parameters after the component is rendered for the first time. Component references aren't passed to JavaScript code. The first and second keys are compared against each other within the same scope of the outer
element: The following example demonstrates first and second keys in their own scopes, unrelated to each other and without influence on each other. For information on catch-all route parameters ({*pageRoute}), which capture paths across multiple folder boundaries, see ASP.NET Core Blazor routing and navigation. The Blazor framework processes a component internally as a render tree, which is the combination of a component's Document Object Model (DOM) and Cascading Style Sheet Object Model (CSSOM). Define a field with the same type as the child component. Please watch the following youtube video: First set the attribute asp-page-handler to the name of the function that handles the click event. This way if the user double clicks the button, the second click will be disabled and the form will only be submitted once. For the following Details and PeopleExample components: In the following PeopleExample component, each iteration of adding a person in OnTimerCallback results in Blazor rebuilding the entire collection. EventCallback is strongly typed and requires passing a T argument in InvokeAsync(T) that's assignable to TValue. Specifying the @on{DOM EVENT}:preventDefault attribute without a value is equivalent to @on{DOM EVENT}:preventDefault="true". If an instance is deleted from the collection, only the corresponding component instance is removed from the UI. In a Blazor Server app, register the services as scoped in Startup.ConfigureServices: For following Details and PeopleExample components: For more information, see the following articles: Optional route parameters aren't supported, so two @page directives are applied in the preceding example. Study the behavior of the page's focus as the people collection automatically grows. Otherwise, the framework assumes that a string literal is set. The following ListGenericTypeItems2 component receives data and cascades a generic type parameter named TExample to its descendent components. (Basically Dog-people). Custom elements don't support child content or templated components. Register a root component as a custom element: In a Blazor WebAssembly app, call RegisterAsCustomElement on RootComponents in Program.cs: Include the following