# Hotkeys
[](https://github.com/jaywcjlove/hotkeys/issues) [](https://github.com/jaywcjlove/hotkeys/network) [](https://github.com/jaywcjlove/hotkeys/stargazers) [](https://github.com/jaywcjlove/hotkeys/releases)  [](https://www.travis-ci.org/jaywcjlove/hotkeys) [](https://coveralls.io/github/jaywcjlove/hotkeys?branch=master) [](./README-zh.md)
HotKeys.js is an input capture library with some very special features, it is easy to pick up and use, has a reasonable footprint (~3kb) (gzipped: 1.73kb), and has no dependencies. It should not interfere with any JavaScript libraries or frameworks. Official document [demo preview](http://jaywcjlove.github.io/hotkeys). [More examples](https://github.com/jaywcjlove/hotkeys/issues?q=label%3ADemo+).
```shell
╭┈┈╮ ╭┈┈╮ ╭┈┈╮
┆ ├┈┈..┈┈┈┈┈.┆ └┈╮┆ ├┈┈..┈┈┈┈┈..┈┈.┈┈..┈┈┈┈┈.
┆ ┆┆ □ ┆┆ ┈┤┆ < ┆ -__┘┆ ┆ ┆┆__ ┈┈┤
╰┈┈┴┈┈╯╰┈┈┈┈┈╯╰┈┈┈┈╯╰┈┈┴┈┈╯╰┈┈┈┈┈╯╰┈┈┈ ┆╰┈┈┈┈┈╯
╰┈┈┈┈┈╯
```
## Usage
You will need `Node.js` installed on your system.
```shell
$ npm install hotkeys-js --save
```
```js
import hotkeys from 'hotkeys-js';
hotkeys('f5', function(event, handler){
// Prevent the default refresh event under WINDOWS system
event.preventDefault()
alert('you pressed F5!')
});
```
Or manually download and link **hotkeys.js** in your HTML, It can also be downloaded via [UNPKG](https://unpkg.com/hotkeys-js/dist/):
```html
```
### Used in React
[react-hotkeys](https://github.com/jaywcjlove/react-hotkeys) is the React component that listen to keydown and keyup keyboard events, defining and dispatching keyboard shortcuts.
```shell
$ npm install react-hot-keys --save
```
Detailed use method please see its documentation [react-hotkeys](https://github.com/jaywcjlove/react-hotkeys).
```jsx
import React, { Component } from 'react';
import Hotkeys from 'react-hot-keys';
export default class HotkeysDemo extends Component {
constructor(props) {
super(props);
this.state = {
output: 'Hello, I am a component that listens to keydown and keyup of a',
}
}
onKeyUp(keyNm, e, handle) {
this.setState({output: keyNm})
}
onKeyDown(keyName, e, handle) {
this.setState({output: keyNm})
}
render() {
return (
{this.state.output}
)
}
}
```
## Browser Support
Hotkeys.js has been tested and should work in.
```shell
Internet Explorer 6+
Safari
Firefox
Chrome
```
## Supported Keys
HotKeys understands the following modifiers: `⇧`, `shift`, `option`, `⌥`, `alt`, `ctrl`, `control`, `command`, and `⌘`.
The following special keys can be used for shortcuts: backspace, tab, clear, enter, return, esc, escape, space, up, down, left, right, home, end, pageup, pagedown, del, delete and f1 through f19.
`⌘` Command()
`⌃` Control
`⌥` Option(alt)
`⇧` Shift
`⇪` Caps Lock(Capital)
~~`fn` Does not support fn~~
`↩︎` return/Enter space
## Defining Shortcuts
One global method is exposed, key which defines shortcuts when called directly.
```
hotkeys([keys:], [option:[string|object|function]], [callback:])
```
```js
hotkeys('f5', function(event, handler) {
// Prevent the default refresh event under WINDOWS system
event.preventDefault();
alert('you pressed F5!');
});
// Returning false stops the event and prevents default browser events
// Mac OS system defines `command + r` as a refresh shortcut
hotkeys('ctrl+r, command+r', function() {
alert('stopped reload!');
return false;
});
hotkeys('a', function(event,handler){
//event.srcElement: input
//event.target: input
if(event.target === "input"){
alert('you pressed a!')
}
alert('you pressed a!')
});
hotkeys('ctrl+a,ctrl+b,r,f', function(event,handler) {
switch(handler.key){
case "ctrl+a":alert('you pressed ctrl+a!');break;
case "ctrl+b":alert('you pressed ctrl+b!');break;
case "r":alert('you pressed r!');break;
case "f":alert('you pressed f!');break;
}
});
hotkeys('ctrl+a+s', function(event,handler) {
if(handler.key === 'ctrl+a+s') {
alert('you pressed ctrl+a+s!');
}
});
hotkeys('*','wcj', function(e){
console.log('do something',e);
});
```
#### option
- `scope`
- `element`
- `keyup`
- `keydown`
```js
hotkeys('o, enter', {
scope: 'wcj',
element: document.getElementById('warpper'),
}, function(){
console.log('do something else');
});
```
## API REFERENCE
Asterisk "*"
Modifier key judgments
```js
hotkeys('*', function(e){
if(hotkeys.shift) console.log('shift is pressed!');
if(hotkeys.ctrl) console.log('ctrl is pressed!');
if(hotkeys.alt) console.log('alt is pressed!');
if(hotkeys.option) console.log('option is pressed!');
if(hotkeys.control) console.log('control is pressed!');
if(hotkeys.cmd) console.log('cmd is pressed!');
if(hotkeys.command) console.log('command is pressed!');
});
```
### setScope
Use the `hotkeys.setScope` method to set scope.
```js
// define shortcuts with a scope
hotkeys('ctrl+o, ctrl+alt+enter', 'issues', function(){
console.log('do something');
});
hotkeys('o, enter', 'files', function(){
console.log('do something else');
});
// set the scope (only 'all' and 'issues' shortcuts will be honored)
hotkeys.setScope('issues'); // default scope is 'all'
```
### getScope
Use the `hotkeys.getScope` method to get scope.
```js
hotkeys.getScope();
```
### deleteScope
Use the `hotkeys.deleteScope` method to delete set scope.
```js
hotkeys.deleteScope('issues');
```
### unbind
Similar to defining shortcuts, they can be unbound using `hotkeys.unbind`.
```js
// unbind 'a' handler
hotkeys.unbind('a');
// unbind a hotkeys only for a single scope
// when no scope is specified it defaults to the current scope (hotkeys.getScope())
hotkeys.unbind('o, enter', 'issues');
hotkeys.unbind('o, enter', 'files');
```
Unbind events through functions.
```js
function example(){}
hotkeys('a', example);
hotkeys.unbind('a', example);
hotkeys('a', 'issues', example);
hotkeys.unbind('a', 'issues', example);
```
### isPressed
Other key queries. For example, `hotkeys.isPressed(77)` is true if the `M` key is currently pressed.
```js
hotkeys('a', function(){
console.log(hotkeys.isPressed("a")); //=> true
console.log(hotkeys.isPressed("A")); //=> true
console.log(hotkeys.isPressed(65)); //=> true
});
```
## keyup
**key down** and **key up** both perform callback events.
```js
hotkeys('ctrl+a,alt+a+s', { keyup: true }, (evn, handler) => {
if(evn.type === 'keydown') {
console.log('keydown:', evn.type, handler, handler.key);
}
if(evn.type === 'keyup') {
console.log('keyup:', evn.type, handler, handler.key);
}
});
```
### getPressedKeyCodes
returns an array of key codes currently pressed.
```js
hotkeys('command+ctrl+shift+a,f', function(){
console.log(hotkeys.getPressedKeyCodes()); //=> [17, 65] or [70]
})
```
### filter
`INPUT` `SELECT` `TEXTAREA` default does not handle.
`Hotkeys.filter` to return to the `true` shortcut keys set to play a role, `flase` shortcut keys set up failure.
```js
hotkeys.filter = function(event){
return true;
}
//How to add the filter to edit labels.
//"contentEditable" Older browsers that do not support drops
hotkeys.filter = function(event) {
var tagName = (event.target || event.srcElement).tagName;
return !(tagName.isContentEditable || tagName == 'INPUT' || tagName == 'SELECT' || tagName == 'TEXTAREA');
}
hotkeys.filter = function(event){
var tagName = (event.target || event.srcElement).tagName;
hotkeys.setScope(/^(INPUT|TEXTAREA|SELECT)$/.test(tagName) ? 'input' : 'other');
return true;
}
```
### noConflict
Relinquish HotKeys’s control of the `hotkeys` variable.
```js
var k = hotkeys.noConflict();
k('a', function() {
console.log("do something")
});
hotkeys()
// -->Uncaught TypeError: hotkeys is not a function(anonymous function)
// @ VM2170:2InjectedScript._evaluateOn
// @ VM2165:883InjectedScript._evaluateAndWrap
// @ VM2165:816InjectedScript.evaluate @ VM2165:682
```
## Development
To develop, Install dependencies, Get the code:
```shell
$ git https://github.com/jaywcjlove/hotkeys.git
$ cd hotkeys # Into the directory
$ npm install # or yarn install
```
To develop, run the self-reloading build:
```shell
$ npm run watch
```
Run Document Website Environment.
```shell
$ npm run doc:dev
```
To contribute, please fork Hotkeys.js, add your patch and tests for it (in the `test/` folder) and submit a pull request.
```shell
$ npm run test
$ npm run test:watch # Development model
```
## License
[MIT © Kenny Wong](./LICENSE)