Maofeng
72 lines
2.3 KiB
Plaintext
72 lines
2.3 KiB
Plaintext
---
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title: Title portals
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description: Mount page titles into an application shell while retaining an SSR fallback.
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order: 20
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toc:
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- id: info-resolver
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title: Page information resolver
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- id: managed-target
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title: Managed title target
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- id: fallback
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title: Fallback
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- id: nested-managers
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title: Nested managers
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---
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## Page information resolver {#info-resolver}
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`PagesManager.getPageInfo` connects route or layout metadata to page components. It receives the optional `Partial<PageInfo>` from `PageContainer` and returns a normalized `PageInfo`, or `undefined` when no managed information is available:
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```tsx
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<PagesManager
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getPageInfo={(info) => ({
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breadcrumb: info?.breadcrumb ?? routeMetadata.breadcrumb,
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description: info?.description ?? routeMetadata.description,
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subtitle: info?.subtitle ?? routeMetadata.subtitle,
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title: info?.title ?? routeMetadata.title,
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})}
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>
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<Outlet />
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</PagesManager>
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```
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If the resolver returns `undefined`, `PageContainer` still merges its local partial information with inherited page information.
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## Managed title target {#managed-target}
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A layout can give `PagesManager` a DOM container while a page places its title in the external Header through `PageTitlePortal`:
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```tsx
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function ApplicationLayout() {
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const [titleContainer, setTitleContainer] =
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React.useState<HTMLElement | null>(null)
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return (
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<PagesManager titleContainer={titleContainer}>
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<header>
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<div ref={setTitleContainer} />
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</header>
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<Outlet />
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</PagesManager>
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)
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}
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function ProductsPage() {
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return (
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<PageTitlePortal>
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<PageTitle>Products</PageTitle>
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</PageTitlePortal>
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)
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}
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```
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`titleContainer` accepts an `Element` or `DocumentFragment`. A `PageTitlePortal` may override the manager with its own `container` prop.
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## Fallback {#fallback}
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Without an available target, the Portal renders `children` in place by default, so server rendering and the first client render retain the page title. Supply `fallback` to replace the inline content, including `null` to hide it.
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## Nested managers {#nested-managers}
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A nested `PagesManager` inherits its parent's `getPageInfo` and title target when they are omitted. Pass `null` as `titleContainer` explicitly to stop title-target inheritance and keep titles in that subtree inline.
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