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60 lines
1.9 KiB
Markdown
60 lines
1.9 KiB
Markdown
---
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title: 'useLoadingIndicator'
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description: This composable gives you access to the loading state of the app page.
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links:
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- label: Source
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icon: i-simple-icons-github
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to: https://github.com/nuxt/nuxt/blob/main/packages/nuxt/src/app/composables/loading-indicator.ts
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size: xs
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---
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## Description
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A composable which returns the loading state of the page. Used by [`<NuxtLoadingIndicator>`](/docs/api/components/nuxt-loading-indicator) and controllable.
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It hooks into [`page:loading:start`](/docs/api/advanced/hooks#app-hooks-runtime) and [`page:loading:end`](/docs/api/advanced/hooks#app-hooks-runtime) to change its state.
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## Parameters
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- `duration`: Duration of the loading bar, in milliseconds (default `2000`).
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- `throttle`: Throttle the appearing and hiding, in milliseconds (default `200`).
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- `estimatedProgress`: By default Nuxt will back off as it approaches 100%. You can provide a custom function to customize the progress estimation, which is a function that receives the duration of the loading bar (above) and the elapsed time. It should return a value between 0 and 100.
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## Properties
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### `isLoading`
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- **type**: `Ref<boolean>`
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- **description**: The loading state
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### `progress`
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- **type**: `Ref<number>`
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- **description**: The progress state. From `0` to `100`.
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## Methods
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### `start()`
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Set `isLoading` to true and start to increase the `progress` value.
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### `finish()`
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Set the `progress` value to `100`, stop all timers and intervals then reset the loading state `500` ms later.
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### `clear()`
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Used by `finish()`. Clear all timers and intervals used by the composable.
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## Example
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```ts
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<script setup lang="ts">
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const { progress, isLoading, start, finish, clear } = useLoadingIndicator({
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duration: 2000,
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throttle: 200,
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// This is how progress is calculated by default
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estimatedProgress: (duration, elapsed) => (2 / Math.PI * 100) * Math.atan(elapsed / duration * 100 / 50)
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})
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</script>
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```
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