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useMagicKeys

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Export Size
1.02 kB
Last Changed
7 months ago

Reactive keys pressed state, with magical keys combination support.

This function uses Proxy

It is NOT supported by IE 11 or below.

Demo

Press the following keys to test out
V
u
e
U
s
e
Shift
Vue
Use
Keys Pressed

Usage

js
import { useMagicKeys } from '@vueuse/core'

const { shift, space, a /* keys you want to monitor */ } = useMagicKeys()

watch(space, (v) => {
  if (v)
    console.log('space has been pressed')
})

watchEffect(() => {
  if (shift.value && a.value)
    console.log('Shift + A have been pressed')
})

Check out all the possible keycodes.

Combinations

You can magically use combinations (shortcuts/hotkeys) by connecting keys with + or _.

ts
import { useMagicKeys } from '@vueuse/core'

const keys = useMagicKeys()
const shiftCtrlA = keys['Shift+Ctrl+A']

watch(shiftCtrlA, (v) => {
  if (v)
    console.log('Shift + Ctrl + A have been pressed')
})
ts
import { useMagicKeys } from '@vueuse/core'

const { Ctrl_A_B, space, alt_s /* ... */ } = useMagicKeys()

watch(Ctrl_A_B, (v) => {
  if (v)
    console.log('Control+A+B have been pressed')
})

You can also use whenever function to make it shorter

ts
import { useMagicKeys, whenever } from '@vueuse/core'

const keys = useMagicKeys()

whenever(keys.shift_space, () => {
  console.log('Shift+Space have been pressed')
})

Current Pressed keys

A special property current is provided to representing all the keys been pressed currently.

ts
import { useMagicKeys, whenever } from '@vueuse/core'

const { current } = useMagicKeys()

console.log(current) // Set { 'control', 'a' }

whenever(
  () => current.has('a') && !current.has('b'),
  () => console.log('A is pressed but not B'),
)

Key Aliasing

ts
import { useMagicKeys, whenever } from '@vueuse/core'

const { shift_cool } = useMagicKeys({
  aliasMap: {
    cool: 'space',
  },
})

whenever(shift_cool, () => console.log('Shift + Space have been pressed'))

By default, we have some preconfigured alias for common practices.

Conditionally Disable

You might have some <input /> elements in your apps, and you don't want to trigger the magic keys handling when users focused on those inputs. There is an example of using useActiveElement and logicAnd to do that.

ts
import { useActiveElement, useMagicKeys, whenever } from '@vueuse/core'
import { logicAnd } from '@vueuse/math'

const activeElement = useActiveElement()
const notUsingInput = computed(() =>
  activeElement.value?.tagName !== 'INPUT'
  && activeElement.value?.tagName !== 'TEXTAREA',)

const { tab } = useMagicKeys()

whenever(logicAnd(tab, notUsingInput), () => {
  console.log('Tab has been pressed outside of inputs!')
})

Custom Event Handler

ts
import { useMagicKeys, whenever } from '@vueuse/core'

const { ctrl_s } = useMagicKeys({
  passive: false,
  onEventFired(e) {
    if (e.ctrlKey && e.key === 's' && e.type === 'keydown')
      e.preventDefault()
  },
})

whenever(ctrl_s, () => console.log('Ctrl+S have been pressed'))

⚠️ This usage is NOT recommended, please use with caution.

Reactive Mode

By default, the values of useMagicKeys() are Ref<boolean>. If you want to use the object in the template, you can set it to reactive mode.

ts
const keys = useMagicKeys({ reactive: true })
vue
<template>
  <div v-if="keys.shift">
    You are holding the Shift key!
  </div>
</template>

Type Declarations

Show Type Declarations
typescript
export interface UseMagicKeysOptions<Reactive extends boolean> {
  /**
   * Returns a reactive object instead of an object of refs
   *
   * @default false
   */
  reactive?: Reactive
  /**
   * Target for listening events
   *
   * @default window
   */
  target?: MaybeRefOrGetter<EventTarget>
  /**
   * Alias map for keys, all the keys should be lowercase
   * { target: keycode }
   *
   * @example { ctrl: "control" }
   * @default <predefined-map>
   */
  aliasMap?: Record<string, string>
  /**
   * Register passive listener
   *
   * @default true
   */
  passive?: boolean
  /**
   * Custom event handler for keydown/keyup event.
   * Useful when you want to apply custom logic.
   *
   * When using `e.preventDefault()`, you will need to pass `passive: false` to useMagicKeys().
   */
  onEventFired?: (e: KeyboardEvent) => void | boolean
}
export interface MagicKeysInternal {
  /**
   * A Set of currently pressed keys,
   * Stores raw keyCodes.
   *
   * @see https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/key
   */
  current: Set<string>
}
export type UseMagicKeysReturn<Reactive extends boolean> = Readonly<
  Omit<
    Reactive extends true
      ? Record<string, boolean>
      : Record<string, ComputedRef<boolean>>,
    keyof MagicKeysInternal
  > &
    MagicKeysInternal
>
/**
 * Reactive keys pressed state, with magical keys combination support.
 *
 * @see https://vueuse.org/useMagicKeys
 */
export declare function useMagicKeys(
  options?: UseMagicKeysOptions<false>,
): UseMagicKeysReturn<false>
export declare function useMagicKeys(
  options: UseMagicKeysOptions<true>,
): UseMagicKeysReturn<true>
export { DefaultMagicKeysAliasMap } from "./aliasMap"

Source

SourceDemoDocs

Contributors

Anthony Fu
jp-liu
Thiago Silveira
丶远方
Hartmut
Jelf
matrixbirds
lavolpecheprogramma
Kasper Seweryn
Thomas Gerbet
zzw
webfansplz
Ciro Lo Sapio
Alex Kozack

Changelog

v10.7.0 on 12/5/2023
fccf2 - feat: upgrade deps (#3614)
v10.0.0-beta.4 on 4/13/2023
4d757 - feat(types)!: rename MaybeComputedRef to MaybeRefOrGetter
v9.7.0 on 12/16/2022
21d24 - fix: also clear 'current' on @focus|@blur (#2515)

Released under the MIT License.