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guardrex merged 1 commit into from
Jul 13, 2023
Merged

HeadOutlet component 8.0 updates #29793

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34 changes: 27 additions & 7 deletions aspnetcore/blazor/components/control-head-content.md
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Expand Up @@ -64,33 +64,53 @@ In a **required**, shared `_Layout.cshtml` file of a prerendered hosted Blazor W

The <xref:Microsoft.AspNetCore.Components.Web.HeadOutlet> component renders content provided by <xref:Microsoft.AspNetCore.Components.Web.PageTitle> and <xref:Microsoft.AspNetCore.Components.Web.HeadContent> components.

In an app created from the Blazor WebAssembly project template, the <xref:Microsoft.AspNetCore.Components.Web.HeadOutlet> component is added to the <xref:Microsoft.AspNetCore.Components.WebAssembly.Hosting.WebAssemblyHostBuilder.RootComponents> collection of the <xref:Microsoft.AspNetCore.Components.WebAssembly.Hosting.WebAssemblyHostBuilder> in `Program.cs`:
:::moniker range=">= aspnetcore-8.0"

```csharp
builder.RootComponents.Add<HeadOutlet>("head::after");
In a Blazor Web App created from the project template, the <xref:Microsoft.AspNetCore.Components.Web.HeadOutlet> component in `App.razor` renders `<head>` content:

```razor
<head>
...
<HeadOutlet />
</head>
```

When the [`::after` pseudo-selector](https://developer.mozilla.org/docs/Web/CSS/::after) is specified, the contents of the root component are appended to the existing head contents instead of replacing the content. This allows the app to retain static head content in `wwwroot/index.html` without having to repeat the content in the app's Razor components.
:::moniker-end

:::moniker range=">= aspnetcore-7.0"
:::moniker range=">= aspnetcore-7.0 < aspnetcore-8.0"

In Blazor Server apps created from the Blazor Server project template, a [Component Tag Helper](xref:mvc/views/tag-helpers/builtin-th/component-tag-helper) renders `<head>` content for the <xref:Microsoft.AspNetCore.Components.Web.HeadOutlet> component in `Pages/_Host.cshtml`:

```cshtml
<head>
...
<component type="typeof(HeadOutlet)" render-mode="ServerPrerendered" />
</head>
```

:::moniker-end

:::moniker range="< aspnetcore-7.0"

In Blazor Server apps created from the Blazor Server project template, a [Component Tag Helper](xref:mvc/views/tag-helpers/builtin-th/component-tag-helper) renders `<head>` content for the <xref:Microsoft.AspNetCore.Components.Web.HeadOutlet> component in `Pages/_Layout.cshtml`:

:::moniker-end

```cshtml
<head>
...
<component type="typeof(HeadOutlet)" render-mode="ServerPrerendered" />
</head>
```

:::moniker-end

In an app created from the Blazor WebAssembly project template, the <xref:Microsoft.AspNetCore.Components.Web.HeadOutlet> component is added to the <xref:Microsoft.AspNetCore.Components.WebAssembly.Hosting.WebAssemblyHostBuilder.RootComponents> collection of the <xref:Microsoft.AspNetCore.Components.WebAssembly.Hosting.WebAssemblyHostBuilder> in `Program.cs`:

```csharp
builder.RootComponents.Add<HeadOutlet>("head::after");
```

When the [`::after` pseudo-selector](https://developer.mozilla.org/docs/Web/CSS/::after) is specified, the contents of the root component are appended to the existing head contents instead of replacing the content. This allows the app to retain static head content in `wwwroot/index.html` without having to repeat the content in the app's Razor components.

## Not found page title

In Blazor apps created from Blazor project templates, the `NotFound` component template in the `App` component (`App.razor`) sets the page title to `Not found`.
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6 changes: 1 addition & 5 deletions aspnetcore/blazor/state-management.md
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Expand Up @@ -270,11 +270,7 @@ To disable prerendering, open the `Pages/_Host.cshtml` file and change the `rend

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

[Prerendering of `<head>` content](xref:blazor/components/control-head-content) is disabled in [`<head>` content](xref:blazor/project-structure#location-of-head-content):

```cshtml
<component type="typeof(HeadOutlet)" render-mode="Server" />
```
When prerendering is disabled, [prerendering of `<head>` content](xref:blazor/components/control-head-content) is disabled.

:::moniker-end

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