---
category: Sensors
---

# useMagicKeys

Reactive keys pressed state, with magical keys combination support.

## Usage

```ts
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')
})
```

::: tip NOTE
If you're using TypeScript with `noUncheckedIndexedAccess` enabled in your `tsconfig.json` (or using Nuxt which enables it by default), the destructured keys will have the type `ComputedRef<boolean> | undefined`.

The `noUncheckedIndexedAccess` TypeScript option adds `undefined` to any un-declared field accessed via index signatures. Since `useMagicKeys()` uses an index signature to allow accessing any key dynamically, TypeScript will treat destructured properties as potentially undefined for type safety.

You'll need to use optional chaining or wrap with a getter function:

```ts
const { shift, space, a } = useMagicKeys()

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

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

Check the [TypeScript documentation](https://www.typescriptlang.org/tsconfig/#noUncheckedIndexedAccess) for more details about `noUncheckedIndexedAccess`.

:::

Check out [all the possible keycodes](https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/code/code_values).

### 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](https://github.com/vueuse/vueuse/blob/main/packages/core/useMagicKeys/aliasMap.ts).

### 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
import { useMagicKeys } from '@vueuse/core'
// ---cut---
const keys = useMagicKeys({ reactive: true })
```

```vue
<template>
  <div v-if="keys.shift">
    You are holding the Shift key!
  </div>
</template>
```

## Type Declarations

```ts
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<
  Record<string, Reactive extends true ? boolean : ComputedRef<boolean>> &
    MagicKeysInternal
>
/**
 * Reactive keys pressed state, with magical keys combination support.
 *
 * @see https://vueuse.org/useMagicKeys
 */
export declare function useMagicKeys<T extends boolean = false>(
  options?: UseMagicKeysOptions<T>,
): UseMagicKeysReturn<T>
export { DefaultMagicKeysAliasMap } from "./aliasMap"
```
