mirror of
https://github.com/hanzoai/next.js.git
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## Why?
We need to clarify that we are scrolling to the top of `{children}` when
it is not shown in the current viewport.
Closes NEXT-2780
---------
Co-authored-by: Zack Tanner <[email protected]>
510 lines
16 KiB
Plaintext
510 lines
16 KiB
Plaintext
---
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title: <Link>
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description: Enable fast client-side navigation with the built-in `next/link` component.
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---
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{/* The content of this doc is shared between the app and pages router. You can use the `<PagesOnly>Content</PagesOnly>` component to add content that is specific to the Pages Router. Any shared content should not be wrapped in a component. */}
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<PagesOnly>
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<details>
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<summary>Examples</summary>
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- [Hello World](https://github.com/vercel/next.js/tree/canary/examples/hello-world)
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- [Active className on Link](https://github.com/vercel/next.js/tree/canary/examples/active-class-name)
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</details>
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</PagesOnly>
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`<Link>` is a React component that extends the HTML `<a>` element to provide [prefetching](/docs/app/building-your-application/routing/linking-and-navigating#2-prefetching) and client-side navigation between routes. It is the primary way to navigate between routes in Next.js.
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<AppOnly>
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```tsx filename="app/page.tsx" switcher
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import Link from 'next/link'
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export default function Page() {
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return <Link href="/dashboard">Dashboard</Link>
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}
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```
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```jsx filename="app/page.js" switcher
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import Link from 'next/link'
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export default function Page() {
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return <Link href="/dashboard">Dashboard</Link>
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}
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```
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</AppOnly>
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<PagesOnly>
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For an example, consider a `pages` directory with the following files:
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- `pages/index.js`
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- `pages/about.js`
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- `pages/blog/[slug].js`
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We can have a link to each of these pages like so:
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```jsx
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import Link from 'next/link'
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function Home() {
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return (
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<ul>
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<li>
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<Link href="/">Home</Link>
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</li>
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<li>
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<Link href="/about">About Us</Link>
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</li>
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<li>
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<Link href="/blog/hello-world">Blog Post</Link>
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</li>
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</ul>
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)
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}
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export default Home
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```
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</PagesOnly>
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## Props
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Here's a summary of the props available for the Link Component:
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<PagesOnly>
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| Prop | Example | Type | Required |
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| ------------------------ | ------------------- | ---------------- | -------- |
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| [`href`](#href-required) | `href="/dashboard"` | String or Object | Yes |
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| [`replace`](#replace) | `replace={false}` | Boolean | - |
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| [`scroll`](#scroll) | `scroll={false}` | Boolean | - |
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| [`prefetch`](#prefetch) | `prefetch={false}` | Boolean | - |
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</PagesOnly>
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<AppOnly>
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| Prop | Example | Type | Required |
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| ------------------------ | ------------------- | ---------------- | -------- |
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| [`href`](#href-required) | `href="/dashboard"` | String or Object | Yes |
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| [`replace`](#replace) | `replace={false}` | Boolean | - |
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| [`scroll`](#scroll) | `scroll={false}` | Boolean | - |
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| [`prefetch`](#prefetch) | `prefetch={false}` | Boolean or null | - |
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</AppOnly>
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> **Good to know**: `<a>` tag attributes such as `className` or `target="_blank"` can be added to `<Link>` as props and will be passed to the underlying `<a>` element.
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### `href` (required)
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The path or URL to navigate to.
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```jsx
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<Link href="/dashboard">Dashboard</Link>
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```
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`href` can also accept an object, for example:
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```jsx
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// Navigate to /about?name=test
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<Link
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href={{
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pathname: '/about',
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query: { name: 'test' },
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}}
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>
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About
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</Link>
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```
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### `replace`
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**Defaults to `false`.** When `true`, `next/link` will replace the current history state instead of adding a new URL into the [browser’s history](https://developer.mozilla.org/docs/Web/API/History_API) stack.
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```tsx filename="app/page.tsx" switcher
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import Link from 'next/link'
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export default function Page() {
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return (
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<Link href="/dashboard" replace>
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Dashboard
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</Link>
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)
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}
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```
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```jsx filename="app/page.js" switcher
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import Link from 'next/link'
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export default function Page() {
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return (
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<Link href="/dashboard" replace>
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Dashboard
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</Link>
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)
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}
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```
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### `scroll`
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**Defaults to `true`.** The default behavior of `<Link>` **is to scroll to the top of a new route or to maintain the scroll position for backwards and forwards navigation.** When `false`, `next/link` will _not_ scroll to the top of the page after a navigation.
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```tsx filename="app/page.tsx" switcher
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import Link from 'next/link'
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export default function Page() {
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return (
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<Link href="/dashboard" scroll={false}>
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Dashboard
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</Link>
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)
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}
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```
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```jsx filename="app/page.js" switcher
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import Link from 'next/link'
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export default function Page() {
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return (
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<Link href="/dashboard" scroll={false}>
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Dashboard
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</Link>
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)
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}
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```
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> **Good to know**:
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>
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> - Next.js will scroll to the [Page](/docs/app/building-your-application/routing/pages-and-layouts#pages) if it is not visible in the viewport upon navigation.
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### `prefetch`
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<AppOnly>
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Prefetching happens when a `<Link />` component enters the user's viewport (initially or through scroll). Next.js prefetches and loads the linked route (denoted by the `href`) and its data in the background to improve the performance of client-side navigations. Prefetching is only enabled in production.
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- **`null` (default)**: Prefetch behavior depends on whether the route is static or dynamic. For static routes, the full route will be prefetched (including all its data). For dynamic routes, the partial route down to the nearest segment with a [`loading.js`](/docs/app/building-your-application/routing/loading-ui-and-streaming#instant-loading-states) boundary will be prefetched.
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- `true`: The full route will be prefetched for both static and dynamic routes.
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- `false`: Prefetching will never happen both on entering the viewport and on hover.
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```tsx filename="app/page.tsx" switcher
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import Link from 'next/link'
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export default function Page() {
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return (
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<Link href="/dashboard" prefetch={false}>
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Dashboard
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</Link>
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)
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}
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```
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```jsx filename="app/page.js" switcher
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import Link from 'next/link'
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export default function Page() {
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return (
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<Link href="/dashboard" prefetch={false}>
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Dashboard
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</Link>
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)
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}
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```
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</AppOnly>
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<PagesOnly>
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Prefetching happens when a `<Link />` component enters the user's viewport (initially or through scroll). Next.js prefetches and loads the linked route (denoted by the `href`) and data in the background to improve the performance of client-side navigations. Prefetching is only enabled in production.
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- **`true` (default)**: The full route and its data will be prefetched.
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- `false`: Prefetching will not happen when entering the viewport, but will happen on hover. If you want to completely remove fetching on hover as well, consider using an `<a>` tag or [incrementally adopting](/docs/app/building-your-application/upgrading/app-router-migration) the App Router, which enables disabling prefetching on hover too.
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```tsx filename="pages/index.tsx" switcher
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import Link from 'next/link'
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export default function Page() {
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return (
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<Link href="/dashboard" prefetch={false}>
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Dashboard
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</Link>
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)
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}
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```
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```jsx filename="pages/index.js" switcher
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import Link from 'next/link'
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export default function Page() {
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return (
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<Link href="/dashboard" prefetch={false}>
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Dashboard
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</Link>
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)
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}
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```
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## Other Props
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### `legacyBehavior`
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An `<a>` element is no longer required as a child of `<Link>`. Add the `legacyBehavior` prop to use the legacy behavior or remove the `<a>` to upgrade. A [codemod is available](/docs/app/building-your-application/upgrading/codemods#new-link) to automatically upgrade your code.
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> **Good to know**: when `legacyBehavior` is not set to `true`, all [`anchor`](https://developer.mozilla.org/docs/Web/HTML/Element/a) tag properties can be passed to `next/link` as well such as, `className`, `onClick`, etc.
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### `passHref`
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Forces `Link` to send the `href` property to its child. Defaults to `false`
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### `scroll`
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Scroll to the top of the page after a navigation. Defaults to `true`
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### `shallow`
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Update the path of the current page without rerunning [`getStaticProps`](/docs/pages/building-your-application/data-fetching/get-static-props), [`getServerSideProps`](/docs/pages/building-your-application/data-fetching/get-server-side-props) or [`getInitialProps`](/docs/pages/api-reference/functions/get-initial-props). Defaults to `false`
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### `locale`
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The active locale is automatically prepended. `locale` allows for providing a different locale. When `false` `href` has to include the locale as the default behavior is disabled.
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</PagesOnly>
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## Examples
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### Linking to Dynamic Routes
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For dynamic routes, it can be handy to use template literals to create the link's path.
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<PagesOnly>
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For example, you can generate a list of links to the dynamic route `pages/blog/[slug].js`
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```jsx filename="pages/blog/index.js"
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import Link from 'next/link'
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function Posts({ posts }) {
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return (
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<ul>
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{posts.map((post) => (
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<li key={post.id}>
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<Link href={`/blog/${post.slug}`}>{post.title}</Link>
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</li>
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))}
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</ul>
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)
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}
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export default Posts
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```
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</PagesOnly>
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<AppOnly>
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For example, you can generate a list of links to the dynamic route `app/blog/[slug]/page.js`:
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```jsx filename="app/blog/page.js"
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import Link from 'next/link'
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function Page({ posts }) {
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return (
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<ul>
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{posts.map((post) => (
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<li key={post.id}>
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<Link href={`/blog/${post.slug}`}>{post.title}</Link>
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</li>
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))}
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</ul>
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)
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}
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```
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</AppOnly>
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### If the child is a custom component that wraps an `<a>` tag
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<AppOnly>
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If the child of `Link` is a custom component that wraps an `<a>` tag, you must add `passHref` to `Link`. This is necessary if you’re using libraries like [styled-components](https://styled-components.com/). Without this, the `<a>` tag will not have the `href` attribute, which hurts your site's accessibility and might affect SEO. If you're using [ESLint](/docs/app/building-your-application/configuring/eslint#eslint-plugin), there is a built-in rule `next/link-passhref` to ensure correct usage of `passHref`.
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</AppOnly>
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<PagesOnly>
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If the child of `Link` is a custom component that wraps an `<a>` tag, you must add `passHref` to `Link`. This is necessary if you’re using libraries like [styled-components](https://styled-components.com/). Without this, the `<a>` tag will not have the `href` attribute, which hurts your site's accessibility and might affect SEO. If you're using [ESLint](/docs/pages/building-your-application/configuring/eslint#eslint-plugin), there is a built-in rule `next/link-passhref` to ensure correct usage of `passHref`.
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</PagesOnly>
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```jsx
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import Link from 'next/link'
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import styled from 'styled-components'
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// This creates a custom component that wraps an <a> tag
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const RedLink = styled.a`
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color: red;
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`
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function NavLink({ href, name }) {
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return (
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<Link href={href} passHref legacyBehavior>
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<RedLink>{name}</RedLink>
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</Link>
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)
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}
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export default NavLink
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```
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- If you’re using [emotion](https://emotion.sh/)’s JSX pragma feature (`@jsx jsx`), you must use `passHref` even if you use an `<a>` tag directly.
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- The component should support `onClick` property to trigger navigation correctly
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### If the child is a functional component
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If the child of `Link` is a functional component, in addition to using `passHref` and `legacyBehavior`, you must wrap the component in [`React.forwardRef`](https://react.dev/reference/react/forwardRef):
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```jsx
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import Link from 'next/link'
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// `onClick`, `href`, and `ref` need to be passed to the DOM element
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// for proper handling
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const MyButton = React.forwardRef(({ onClick, href }, ref) => {
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return (
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<a href={href} onClick={onClick} ref={ref}>
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Click Me
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</a>
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)
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})
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function Home() {
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return (
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<Link href="/about" passHref legacyBehavior>
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<MyButton />
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</Link>
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)
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}
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export default Home
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```
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### With URL Object
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`Link` can also receive a URL object and it will automatically format it to create the URL string. Here's how to do it:
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```jsx
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import Link from 'next/link'
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function Home() {
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return (
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<ul>
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<li>
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<Link
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href={{
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pathname: '/about',
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query: { name: 'test' },
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}}
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>
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About us
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</Link>
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</li>
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<li>
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<Link
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href={{
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pathname: '/blog/[slug]',
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query: { slug: 'my-post' },
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}}
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>
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Blog Post
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</Link>
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</li>
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</ul>
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)
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}
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export default Home
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```
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The above example has a link to:
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- A predefined route: `/about?name=test`
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- A [dynamic route](/docs/app/building-your-application/routing/dynamic-routes): `/blog/my-post`
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You can use every property as defined in the [Node.js URL module documentation](https://nodejs.org/api/url.html#url_url_strings_and_url_objects).
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### Replace the URL instead of push
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The default behavior of the `Link` component is to `push` a new URL into the `history` stack. You can use the `replace` prop to prevent adding a new entry, as in the following example:
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```jsx
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<Link href="/about" replace>
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About us
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</Link>
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```
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### Disable scrolling to the top of the page
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The default behavior of `Link` is to scroll to the top of the page. When there is a hash defined it will scroll to the specific id, like a normal `<a>` tag. To prevent scrolling to the top / hash `scroll={false}` can be added to `Link`:
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```jsx
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<Link href="/#hashid" scroll={false}>
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Disables scrolling to the top
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</Link>
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```
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### Middleware
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It's common to use [Middleware](/docs/app/building-your-application/routing/middleware) for authentication or other purposes that involve rewriting the user to a different page. In order for the `<Link />` component to properly prefetch links with rewrites via Middleware, you need to tell Next.js both the URL to display and the URL to prefetch. This is required to avoid un-necessary fetches to middleware to know the correct route to prefetch.
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For example, if you want to serve a `/dashboard` route that has authenticated and visitor views, you may add something similar to the following in your Middleware to redirect the user to the correct page:
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```js filename="middleware.js"
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export function middleware(req) {
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const nextUrl = req.nextUrl
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if (nextUrl.pathname === '/dashboard') {
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if (req.cookies.authToken) {
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return NextResponse.rewrite(new URL('/auth/dashboard', req.url))
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} else {
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return NextResponse.rewrite(new URL('/public/dashboard', req.url))
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}
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}
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}
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```
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In this case, you would want to use the following code in your `<Link />` component:
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```js
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import Link from 'next/link'
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import useIsAuthed from './hooks/useIsAuthed'
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export default function Page() {
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const isAuthed = useIsAuthed()
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const path = isAuthed ? '/auth/dashboard' : '/public/dashboard'
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return (
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<Link as="/dashboard" href={path}>
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Dashboard
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</Link>
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)
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}
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```
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<PagesOnly>
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> **Good to know**: If you're using [Dynamic Routes](/docs/app/building-your-application/routing/dynamic-routes), you'll need to adapt your `as` and `href` props. For example, if you have a Dynamic Route like `/dashboard/authed/[user]` that you want to present differently via middleware, you would write: `<Link href={{ pathname: '/dashboard/authed/[user]', query: { user: username } }} as="/dashboard/[user]">Profile</Link>`.
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</PagesOnly>
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|
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## Version History
|
||
|
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| Version | Changes |
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| --------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
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| `v13.0.0` | No longer requires a child `<a>` tag. A [codemod](/docs/app/building-your-application/upgrading/codemods#remove-a-tags-from-link-components) is provided to automatically update your codebase. |
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| `v10.0.0` | `href` props pointing to a dynamic route are automatically resolved and no longer require an `as` prop. |
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| `v8.0.0` | Improved prefetching performance. |
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| `v1.0.0` | `next/link` introduced. |
|