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Jul 15, 2021
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FocusOnNavigate for Blazor Router #22735

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FocusOnNavigate for Blazor Router
guardrex Jul 15, 2021
336b74b
Updates
guardrex Jul 15, 2021
9a1d576
Updates
guardrex Jul 15, 2021
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26 changes: 26 additions & 0 deletions aspnetcore/blazor/fundamentals/routing.md
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Original file line number Diff line number Diff line change
Expand Up @@ -66,6 +66,32 @@ Components support multiple route templates using multiple [`@page` directives](
> [!NOTE]
> The <xref:Microsoft.AspNetCore.Components.Routing.Router> doesn't interact with query string values. To work with query strings, see the [Query string and parse parameters](#query-string-and-parse-parameters) section.

::: moniker range=">= aspnetcore-6.0"

## Focus an element on navigation

Use the `FocusOnNavigate` component to set the UI focus to an element based on a CSS selector after navigating from one page to another. You can see the `FocusOnNavigate` component in use by the `App` component of an app generated from a Blazor project template.

`App.razor`:

```razor
<Router AppAssembly="@typeof(Program).Assembly">
<Found Context="routeData">
<RouteView RouteData="@routeData" DefaultLayout="@typeof(MainLayout)" />
<FocusOnNavigate RouteData="@routeData" Selector="h1" />
</Found>
<NotFound>
<LayoutView Layout="@typeof(MainLayout)">
<p role="alert">Sorry, there's nothing at this address.</p>
</LayoutView>
</NotFound>
</Router>
```

When the preceding `Router` component navigates to a new page, the `FocusOnNavigate` component sets the focus to the page's top-level header (`<h1>`). This is a common strategy for ensuring that page navigations are announced when using a screen reader.

::: moniker-end

## Provide custom content when content isn't found

The <xref:Microsoft.AspNetCore.Components.Routing.Router> component allows the app to specify custom content if content isn't found for the requested route.
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2 changes: 2 additions & 0 deletions aspnetcore/toc.yml
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Expand Up @@ -465,6 +465,8 @@
href: blazor/components/cascading-values-and-parameters.md#cascadingvalue-component
- name: ErrorBoundary
href: blazor/fundamentals/handle-errors.md#error-boundaries
- name: FocusOnNavigate
href: blazor/fundamentals/routing.md#focus-an-element-on-navigation
- name: InputCheckbox
href: blazor/forms-validation.md#built-in-form-components
- name: InputDate
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