# Hotkeys

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这是一个强健的 Javascript 库用于捕获键盘输入和输入的组合键，它没有依赖，压缩只有只有(~3kb)，gzip:1.9k。[官方文档DEMO预览](http://jaywcjlove.github.io/hotkeys/?lang=cn)


```shell
╭┈┈╮          ╭┈┈╮  ╭┈┈╮
┆  ├┈┈..┈┈┈┈┈.┆  └┈╮┆  ├┈┈..┈┈┈┈┈..┈┈.┈┈..┈┈┈┈┈.
┆     ┆┆  □  ┆┆   ┈┤┆    < ┆  -__┘┆  ┆  ┆┆__ ┈┈┤
╰┈┈┴┈┈╯╰┈┈┈┈┈╯╰┈┈┈┈╯╰┈┈┴┈┈╯╰┈┈┈┈┈╯╰┈┈┈  ┆╰┈┈┈┈┈╯
                                  ╰┈┈┈┈┈╯
```

## 创建

您将需要在您的系统上安装的 Node.js。

```sh
# bower 安装
$ bower install hotkeysjs

# npm 安装
$ npm install hotkeys-js

$ npm run build # 编译
$ npm run watch # 开发模式
```

```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!') 
});
```

或者在您的HTML中手动下载并引入** hotkeys.js **，你也可以通过 [UNPKG](https://unpkg.com/hotkeys-js@3.2.0/dist/) 进行下载：

```html
<script src="https://unpkg.com/hotkeys-js@3.2.0/dist/hotkeys.min.js"></script>
<script type="text/javascript">
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;
  }
});
<script>
```

## React中使用

[react-hotkeys](https://github.com/jaywcjlove/react-hotkeys)，安装如下：

```sh
npm i -S react-hot-keys
```

例子

```js
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(keyName, e, handle) {
    console.log("test:onKeyUp", e, handle)
    this.setState({ output: `onKeyUp ${keyName}` });
  }
  onKeyDown(keyName, e, handle) {
    console.log("test:onKeyDown", keyName, e, handle)
    this.setState({ output: `onKeyDown ${keyName}` });
  }
  render() {
    return (
      <Hotkeys 
        keyName="shift+a,alt+s" 
        onKeyDown={this.onKeyDown.bind(this)}
        onKeyUp={this.onKeyUp.bind(this)}
      >
        <div style={{ padding: "50px" }}> {this.state.output} </div>
      </Hotkeys>
    )
  }
}
```

## 使用

传统调用

```html
<script type="text/javascript" src="./js/hotkeys.js"></script>
```

包加载

```js
import hotkeys from 'hotkeys-js';

hotkeys('shift+a,alt+d, w', function(e){
  console.log('干点活儿',e);
  if(hotkeys.shift) console.log('大哥你摁下了 shift 键！');
  if(hotkeys.ctrl) console.log('大哥你摁下了 ctrl 键！');
  if(hotkeys.alt) console.log('大哥你摁下了 alt 键！');
});
```

## 支持的键

`⇧`, `shift`, `option`, `⌥`, `alt`, `ctrl`, `control`, `command`, `⌘`

`⌘` Command()  
`⌃` Control  
`⌥` Option(alt)  
`⇧` Shift  
`⇪` Caps Lock(大写)  
~~`fn` 功能键就是fn(不支持)~~  
`↩︎` return/enter  
`space` 空格键  

## 修饰键判断
可以对下面的修饰键判断 `shift` `alt` `option` `ctrl` `control` `command`，特别注意`+`和`=`键值相同，组合键设置`⌘+=`

```js
hotkeys('shift+a,alt+d, w', function(e){
  console.log('干点活儿',e);
  if(hotkeys.shift) console.log('您摁下了 shift 键!');
  if(hotkeys.ctrl) console.log('您摁下了 ctrl 键!');
  if(hotkeys.alt) console.log('您摁下了 alt 键!');
  if(hotkeys.option) console.log('您摁下了 option 键!');
  if(hotkeys.control) console.log('您摁下了 control 键!');
  if(hotkeys.cmd) console.log('您摁下了 cmd 键!');
  if(hotkeys.command) console.log('您摁下了 command 键!');
});
```

## 定义快捷键

> `hotkeys([keys:<String>], [option:[string|object|function]], [callback:<function>])`

```js
// 定义 F5 快捷键
hotkeys('f5', function(event,handler){
  //event.srcElement: input 
  //event.target: input
  // 阻止WINDOWS系统下的默认刷新事件
  event.preventDefault() 
  alert('你按下了 F5 键!') 
});
// 定义a快捷键
hotkeys('a', function(event,handler){
  //event.srcElement: input 
  //event.target: input
  if(event.target === "input"){
    alert('你在输入框中按下了 a!')
  }
  alert('你按下了 a!') 
});

// 定义a快捷键
hotkeys('ctrl+a,ctrl+b,r,f', function(event,handler){
  switch(handler.key){
    case "ctrl+a":alert('你按下了ctrl+a!');break;
    case "ctrl+b":alert('你按下了ctrl+b!');break;
    case "r":alert('你按下了r!');break;
    case "f":alert('你按下了f!');break;
  }
  //handler.scope 范围
});

// 返回false将停止活动，并阻止默认浏览器事件
hotkeys('ctrl+r', function(){ alert('停止刷新!'); return false });

// 多个快捷方式做同样的事情
hotkeys('⌘+r, ctrl+r', function(){ });

// 对所有摁键执行任务
hotkeys('*','wcj', function(e){
  console.log('干点活儿',e);
  console.log("key.getScope()::",hotkeys.getScope());
  if(hotkeys.shift) console.log('大哥你摁下了 shift 键！');
  if(hotkeys.ctrl) console.log('大哥你摁下了 ctrl 键！');
  if(hotkeys.alt) console.log('大哥你摁下了 alt 键！');
});
```

#### option 

- `scope<String>`
- `element<HTMLElement>`

```js
hotkeys('o, enter', {
  scope: 'wcj',
  element: document.getElementById('warpper'),
}, function(){ 
  console.log('do something else');
});
```

## 切换快捷键

如果在单页面在不同的区域，相同的快捷键，干不同的事儿，之间来回切换。O(∩_∩)O ！

```js
// 一个快捷键，有可能干的活儿不一样哦
hotkeys('ctrl+o, ctrl+alt+enter', 'scope1', function(){
  console.log('你好看');
});

hotkeys('ctrl+o, enter', 'scope2', function(){ 
  console.log('你好丑陋啊！');
});

// 你摁 “ctrl+o”组合键
// 当scope等于 scope1 ，执行 回调事件打印出 “你好看”，
// 当scope等于 scope2 ，执行 回调事件打印出 “你好丑陋啊！”，

// 通过setScope设定范围scope
hotkeys.setScope('scope1'); // 默认所有事儿都干哦
```

## 标记快捷键范围

**删除** 区域范围标记

```js
hotkeys.deleteScope('scope1');
```

**获取** 区域范围标记

```js
hotkeys.getScope();
```

**设置** 区域范围标记

```js
hotkeys.setScope('scope1');
```

## 解除绑定

`hotkeys.unbind("ctrl+o, ctrl+alt+enter")` 解除绑定两组快捷键  
`hotkeys.unbind("ctrl+o","files")` 解除绑定名字叫files钟的一组快捷键  

## 键判断

判断摁下的键是否为某个键

```js
hotkeys('a', function(){
  console.log(hotkeys.isPressed("a")); //=> true
  console.log(hotkeys.isPressed("A")); //=> true
  console.log(hotkeys.isPressed(65)); //=> true
});
```

## 获取摁下键值

获取摁下绑定键的键值 `hotkeys.getPressedKeyCodes()`

```js
hotkeys('command+ctrl+shift+a,f', function(){
  console.log(hotkeys.getPressedKeyCodes()); //=> [17, 65] 或者 [70]
})
```

## 过滤

`INPUT`  `SELECT` `TEXTAREA` 默认不处理。
`hotkeys.filter` 返回 `true` 快捷键设置才会起作用，`false` 快捷键设置失效。

```javascript
hotkeys.filter = function(event){
  return true;
}
// 如何增加过滤可编辑标签 <div contentEditable="true"></div>
// contentEditable老浏览器不支持滴
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;
}
```

## 兼容模式

```js
var k = hotkeys.noConflict();
k('a', function() {
  console.log("这里可以干一些事儿")
});

hotkeys()
// -->Uncaught TypeError: hotkeys is not a function(anonymous function)
// @ VM2170:2InjectedScript._evaluateOn
// @ VM2165:883InjectedScript._evaluateAndWrap
// @ VM2165:816InjectedScript.evaluate @ VM2165:682
```