mirror of
https://github.com/nuxt/nuxt.git
synced 2024-11-23 06:05:11 +00:00
60 lines
2.0 KiB
Markdown
60 lines
2.0 KiB
Markdown
---
|
|
title: 'useLoadingIndicator'
|
|
description: This composable gives you access to the loading state of the app page.
|
|
links:
|
|
- label: Source
|
|
icon: i-simple-icons-github
|
|
to: https://github.com/nuxt/nuxt/blob/main/packages/nuxt/src/app/composables/loading-indicator.ts
|
|
size: xs
|
|
---
|
|
|
|
## Description
|
|
|
|
A composable which returns the loading state of the page. Used by [`<NuxtLoadingIndicator>`](/docs/api/components/nuxt-loading-indicator) and controllable.
|
|
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.
|
|
|
|
## Parameters
|
|
|
|
- `duration`: Duration of the loading bar, in milliseconds (default `2000`).
|
|
- `throttle`: Throttle the appearing and hiding, in milliseconds (default `200`).
|
|
- `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.
|
|
|
|
## Properties
|
|
|
|
### `isLoading`
|
|
|
|
- **type**: `Ref<boolean>`
|
|
- **description**: The loading state
|
|
|
|
### `progress`
|
|
|
|
- **type**: `Ref<number>`
|
|
- **description**: The progress state. From `0` to `100`.
|
|
|
|
## Methods
|
|
|
|
### `start()`
|
|
|
|
Set `isLoading` to true and start to increase the `progress` value.
|
|
|
|
### `finish()`
|
|
|
|
Set the `progress` value to `100`, stop all timers and intervals then reset the loading state `500` ms later. `finish` accepts a `{ force: true }` option to skip the interval before the state is reset.
|
|
|
|
### `clear()`
|
|
|
|
Used by `finish()`. Clear all timers and intervals used by the composable.
|
|
|
|
## Example
|
|
|
|
```vue
|
|
<script setup lang="ts">
|
|
const { progress, isLoading, start, finish, clear } = useLoadingIndicator({
|
|
duration: 2000,
|
|
throttle: 200,
|
|
// This is how progress is calculated by default
|
|
estimatedProgress: (duration, elapsed) => (2 / Math.PI * 100) * Math.atan(elapsed / duration * 100 / 50)
|
|
})
|
|
</script>
|
|
```
|