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docs(api): enhance
abortNavigation
util (#6936)
Co-authored-by: Daniel Roe <daniel@roe.dev> Co-authored-by: Damian Głowala <48835293+DamianGlowala@users.noreply.github.com>
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# `abortNavigation` | ||
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`abortNavigation` is a helper function that prevents navigation from taking place and throws an error if one is set as a parameter. | ||
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::alert{type="warning"} | ||
`abortNavigation` is only usable inside a [route middleware handler](/guide/directory-structure/middleware). | ||
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## Type | ||
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```ts | ||
abortNavigation(err?: Error | string): false | ||
``` | ||
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* **err**: Optional error to be thrown by `abortNavigation()`. | ||
## Parameters | ||
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::alert{type="warning"} | ||
`abortNavigation()` is only usable inside a [route middleware handler](/guide/directory-structure/middleware). | ||
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### `err` | ||
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- **Type**: [`Error`](https://developer.mozilla.org/pl/docs/Web/JavaScript/Reference/Global_Objects/Error) | `string` | ||
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Optional error to be thrown by `abortNavigation`. | ||
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## Examples | ||
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The example below shows how you can use `abortNavigation` in a route middleware to prevent unauthorized route access: | ||
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Inside a route middleware handler, `abortNavigation()` will abort navigation, and throw an error if one is set as a parameter. | ||
```ts [middleware/auth.ts] | ||
export default defineNuxtRouteMiddleware((to, from) => { | ||
const user = useState('user') | ||
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if (!user.value.isAuthorized) { | ||
return abortNavigation() | ||
} | ||
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return navigateTo('/edit-post') | ||
}) | ||
``` | ||
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### `err` as a String | ||
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You can pass the error as a string: | ||
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```ts [middleware/auth.ts] | ||
export default defineNuxtRouteMiddleware((to, from) => { | ||
const auth = useState('auth') | ||
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if (!user.value.isAuthorized) { | ||
abortNavigation('Insufficient permissions.') | ||
} | ||
}) | ||
``` | ||
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### `err` as an Error Object | ||
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You can pass the error as an [`Error`](https://developer.mozilla.org/pl/docs/Web/JavaScript/Reference/Global_Objects/Error) object, e.g. caught by the `catch`-block: | ||
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```ts [middleware/auth.ts] | ||
export default defineNuxtRouteMiddleware((to, from) => { | ||
try { | ||
/* code that might throw an error */ | ||
} catch (err) { | ||
abortNavigation(err) | ||
} | ||
}) | ||
``` | ||
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::ReadMore{link="/guide/features/routing"} | ||
:: |