Nuxt/docs/3.api/2.composables/use-loading-indicator.md

title	description	links
useLoadingIndicator	This composable gives you access to the loading state of the app page.	label icon to size Source i-simple-icons-github https://github.com/nuxt/nuxt/blob/main/packages/nuxt/src/app/composables/loading-indicator.ts xs

Description

A composable which returns the loading state of the page. Used by <NuxtLoadingIndicator> and controllable. It hooks into page:loading:start and page:loading:end 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

error

• type: Ref<boolean>
• description: The error 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, and { error: true } to change the loading bar color and set the error property to true.

clear()

Used by finish(). Clear all timers and intervals used by the composable.

Example

<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>