Switch

A switch allows users to turn an individual option on or off.

Features

• Sync with disabled state of fieldset
• Sync with form reset events
• Can be toggled programmatically

Installation

Install the switch package:

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

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

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

npm install @zag-js/switch @zag-js/svelte
# or
yarn add @zag-js/switch @zag-js/svelte

Anatomy

Check the switch anatomy and part names.

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

Usage

Import the switch package:

import * as zagSwitch from "@zag-js/switch"

The switch package exports two key functions:

• machine - State machine logic.
• connect - Maps machine state to JSX props and event handlers.

Then use the framework integration helpers:

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

function Checkbox() {
  const service = useMachine(zagSwitch.machine, { id: "1" })

  const api = zagSwitch.connect(service, normalizeProps)

  return (
    <label {...api.getRootProps()}>
      <input {...api.getHiddenInputProps()} />
      <span {...api.getControlProps()}>
        <span {...api.getThumbProps()} />
      </span>
      <span {...api.getLabelProps()}>{api.checked ? "On" : "Off"}</span>
    </label>
  )
}

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

function Checkbox() {
  const service = useMachine(zagSwitch.machine, { id: "1" })

  const api = createMemo(() => zagSwitch.connect(service, normalizeProps))

  return (
    <label {...api().getRootProps()}>
      <input {...api().getHiddenInputProps()} />
      <span {...api().getControlProps()}>
        <span {...api().getThumbProps()} />
      </span>
      <span {...api().getLabelProps()}>{api().checked ? "On" : "Off"}</span>
    </label>
  )
}

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

  const service = useMachine(zagSwitch.machine, { id: "1" })

  const api = computed(() => zagSwitch.connect(service, normalizeProps))
</script>

<template>
  <label v-bind="api.getRootProps()">
    <input v-bind="api.getHiddenInputProps()" />
    <span v-bind="api.getControlProps()">
      <span v-bind="api.getThumbProps()" />
    </span>
    <span v-bind="api.getLabelProps()">
      <span v-if="api.checked">On</span>
      <span v-else>Off</span>
    </span>
  </label>
</template>

<script lang="ts">
  import { normalizeProps, useMachine } from "@zag-js/svelte"
  import * as zagSwitch from "@zag-js/switch"

  const id = $props.id()
  const service = useMachine(zagSwitch.machine, {
    id,
    name: "switch",
  })
  const api = $derived(zagSwitch.connect(service, normalizeProps))
</script>

<label {...api.getRootProps()}>
  <input {...api.getHiddenInputProps()} />
  <span {...api.getControlProps()}>
    <span {...api.getThumbProps()}></span>
  </span>
  <span {...api.getLabelProps()}>{api.checked ? "On" : "Off"}</span>
</label>

Making it checked by default

Use the defaultChecked property to make a switch checked by default.

const service = useMachine(zagSwitch.machine, {
  defaultChecked: true,
})

Controlled checked state

Use checked and onCheckedChange for controlled usage.

const service = useMachine(zagSwitch.machine, {
  checked,
  onCheckedChange(details) {
    setChecked(details.checked)
  },
})

Listening for changes

When the switch value changes, the onCheckedChange callback is invoked.

const service = useMachine(zagSwitch.machine, {
  onCheckedChange(details) {
    // details => { checked: boolean }
    console.log("switch is:", details.checked ? "On" : "Off")
  },
})

Programmatic toggle

Use the connected API when you need imperative control.

api.setChecked(true)
api.toggleChecked()

Usage within forms

To use switch in forms, set name and render api.getHiddenInputProps().

const service = useMachine(zagSwitch.machine, {
  name: "feature",
})

Custom form value

Set value to customize the submitted form value when checked.

const service = useMachine(zagSwitch.machine, {
  name: "notifications",
  value: "enabled",
})

Styling guide

Each switch part includes a data-part attribute you can target in CSS.

Focused State

When the switch input is focused, the data-focus attribute is added to the root, control and label parts.

[data-part="root"][data-focus] {
  /* styles for root focus state */
}

[data-part="control"][data-focus] {
  /* styles for control focus state */
}

[data-part="label"][data-focus] {
  /* styles for label focus state */
}

Disabled State

When the switch is disabled, the data-disabled attribute is added to the root, control and label parts.

[data-part="root"][data-disabled] {
  /* styles for root disabled state */
}

[data-part="control"][data-disabled] {
  /* styles for control disabled state */
}

[data-part="label"][data-disabled] {
  /* styles for label disabled state */
}

Invalid State

When the switch is invalid, the data-invalid attribute is added to the root, control and label parts.

[data-part="root"][data-invalid] {
  /* styles for root invalid state */
}

[data-part="control"][data-invalid] {
  /* styles for control invalid state */
}

[data-part="label"][data-invalid] {
  /* styles for label invalid state */
}

Methods and Properties

Machine Context

The switch machine exposes the following context properties:

• idsPartial<{ root: string; hiddenInput: string; control: string; label: string; thumb: string; }>The ids of the elements in the switch. Useful for composition.
• labelstringSpecifies the localized strings that identifies the accessibility elements and their states
• disabledbooleanWhether the switch is disabled.
• invalidbooleanIf `true`, the switch is marked as invalid.
• requiredbooleanIf `true`, the switch input is marked as required,
• readOnlybooleanWhether the switch is read-only
• onCheckedChange(details: CheckedChangeDetails) => voidFunction to call when the switch is clicked.
• checkedbooleanThe controlled checked state of the switch
• defaultCheckedbooleanThe initial checked state of the switch when rendered. Use when you don't need to control the checked state of the switch.
• namestringThe name of the input field in a switch (Useful for form submission).
• formstringThe id of the form that the switch belongs to
• valuestring | numberThe value of switch input. Useful for form submission.
• 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.

Machine API

The switch api exposes the following methods:

• checkedbooleanWhether the switch is checked
• disabledbooleanWhether the switch is disabled
• focusedbooleanWhether the switch is focused
• setChecked(checked: boolean) => voidSets the checked state of the switch.
• toggleCheckedVoidFunctionToggles the checked state of the switch.

Data Attributes

Accessibility

Adheres to the Switch WAI-ARIA design pattern

Keyboard Interactions

• SpaceEnter
  Toggle the switch