Progress

Progress is a simple progress bar that can be used to show the progress of a task such as downloading a file, uploading an image, etc.

Features

• Support for linear and circular progress bars.
• Support for minimum and maximum values.
• Support for indeterminate progress bars.

Installation

To use the progress machine in your project, run the following command in your command line:

npm install @zag-js/progress @zag-js/react
# or
yarn add @zag-js/progress @zag-js/react

npm install @zag-js/progress @zag-js/solid
# or
yarn add @zag-js/progress @zag-js/solid

npm install @zag-js/progress @zag-js/vue
# or
yarn add @zag-js/progress @zag-js/vue

npm install @zag-js/progress @zag-js/vue
# or
yarn add @zag-js/progress @zag-js/vue

This command will install the framework agnostic progress logic and the reactive utilities for your framework of choice.

Anatomy

To set up the progress correctly, you'll need to understand its anatomy and how we name its parts.

Each part includes a data-part attribute to help identify them in the DOM.

Usage

First, import the progress package into your project

import * as progress from "@zag-js/progress"

The progress package exports two key functions:

• machine — The state machine logic for the progress widget.
• connect — The function that translates the machine's state to JSX attributes and event handlers.

You'll also need to provide a unique id to the useMachine hook. This is used to ensure that every part has a unique identifier.

Next, import the required hooks and functions for your framework and use the progress machine in your project 🔥

import * as progress from "@zag-js/progress"
import { normalizeProps, useMachine } from "@zag-js/react"
import { useId } from "react"

function Progress() {
  const [state, send] = useMachine(progress.machine({ id: useId() }))

  const api = progress.connect(state, send, normalizeProps)

  return (
    <div {...api.rootProps}>
      <div {...api.labelProps}>Upload progress</div>
      <div {...api.trackProps}>
        <div {...api.rangeProps} />
      </div>
    </div>
  )
}

import * as progress from "@zag-js/progress"
import { normalizeProps, useMachine } from "@zag-js/solid"
import { createMemo, createUniqueId } from "solid-js"

function Progress() {
  const [state, send] = useMachine(progress.machine({ id: useId() }))

  const api = createMemo(() => progress.connect(state, send, normalizeProps))

  return (
    <div {...api().rootProps}>
      <div {...api().labelProps}>Upload progress</div>
      <div {...api().trackProps}>
        <div {...api().rangeProps} />
      </div>
    </div>
  )
}

import * as progress from "@zag-js/progress"
import { normalizeProps, useMachine } from "@zag-js/vue"
import { defineComponent, h, Fragment, computed } from "vue"

export default defineComponent({
  name: "Progress",
  setup() {
    const [state, send] = useMachine(progress.machine({ id: "1" }))

    const apiRef = computed(() =>
      progress.connect(state.value, send, normalizeProps),
    )

    return () => {
      const api = apiRef.value
      return (
        <div {...api.rootProps}>
          <div {...api.labelProps}>Upload progress</div>
          <div {...api.trackProps}>
            <div {...api.rangeProps} />
          </div>
        </div>
      )
    }
  },
})

<script setup>
  import * as progress from "@zag-js/progress"
  import { normalizeProps, useMachine } from "@zag-js/vue"
  import { computed } from "vue"

  const [state, send] = useMachine(progress.machine({ id: "1" }))

  const api = computed(() =>
    progress.connect(state.value, send, normalizeProps),
  )
</script>

<template>
  <div v-bind="api.rootProps">
    <div v-bind="api.labelProps">Upload progress</div>
    <div v-bind="api.trackProps">
      <div v-bind="api.rangeProps" />
    </div>
  </div>
</template>

Setting the value

Use the api.setValue method to set the value of the progress bar.

const [state, send] = useMachine(
  progress.machine({
    value: 50,
  }),
)

Setting the minimum and maximum values

By default, the progress bar has a minimum value of 0 and a maximum value of 100. You can change these values by passing the min and max options to the machine.

const [state, send] = useMachine(
  progress.machine({
    min: 0,
    max: 1000,
  }),
)

Using the indeterminate state

The progress component is determinate by default, with the value and max set to 50 and 100 respectively.

Set value to null to indicate an indeterminate value for operations whose progress can't be determined (e.g., attempting to reconnect to a server).

const [state, send] = useMachine(
  progress.machine({
    value: null,
  }),
)

Showing a value text

Progress bars can only be interpreted by sighted users. To include a text description to support assistive technologies like screen readers, use the valueText part.

const [state, send] = useMachine(
  progress.machine({
    translations: {
      valueText: ({ value, max }) =>
        value == null ? "Loading..." : `${value} of ${max} items loaded`,
    },
  }),
)

Then you need to render the valueText part in your component.

<div {...api.valueText}>{api.valueText}</div>

Styling guide

Earlier, we mentioned that each menu part has a data-part attribute added to them to select and style them in the DOM.

[data-scope="progress"][data-part="root"] {
  /* Styles for the root part */
}

[data-scope="progress"][data-part="track"] {
  /* Styles for the track part */
}

[data-scope="progress"][data-part="range"] {
  /* Styles for the range part */
}

Indeterminate state

To style the indeterminate state, you can use the [data-state=indeterminate] selector.

[data-scope="progress"][data-part="root"][data-state="indeterminate"] {
  /* Styles for the root indeterminate state */
}

[data-scope="progress"][data-part="track"][data-state="indeterminate"] {
  /* Styles for the root indeterminate state */
}

[data-scope="progress"][data-part="range"][data-state="indeterminate"] {
  /* Styles for the root indeterminate state */
}

Methods and Properties

Machine Context

The progress machine exposes the following context properties:

• idsPartial<{ root: string; track: string; label: string; circle: string; }>The ids of the elements in the progress bar. Useful for composition.
• valuenumberThe current value of the progress bar.
• minnumberThe minimum allowed value of the progress bar.
• maxnumberThe maximum allowed value of the progress bar.
• translationsIntlTranslationsThe localized messages to use.
• dir"ltr" | "rtl"The document's text/writing direction.
• idstringThe unique identifier of the machine.
• getRootNode() => ShadowRoot | Node | DocumentA root node to correctly resolve document in custom environments. E.x.: Iframes, Electron.
• orientationOrientationThe orientation of the element.

Machine API

The progress api exposes the following methods:

• valuenumberThe current value of the progress bar.
• valueAsStringstringThe current value of the progress bar as a string.
• setValue(value: number) => voidSets the current value of the progress bar.
• setToMax() => voidSets the current value of the progress bar to the max value.