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https://github.com/keithamus/jwerty

⌨ Awesome handling of keyboard events
https://github.com/keithamus/jwerty

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⌨ Awesome handling of keyboard events

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README 

        
The jwertyCode

==============



All jwerty events will require a jwertyCode in some way. jwertyCodes can be

passed as strings or arrays, strings being the easiest way to express a combo.

A jwertyCode string should look similar to this:



    '⌃+⇧+P/⌘+⇧+P, X'



Case and whitespace do not matter. `+` is used to add keys to make a single

combo, `/` is used to provide a list of optional keys or key combos, and `,` is

used to make a key combo sequence. For example, if you wanted to look for the

key combination of control + shift + P, then one of the following would

represent that (you can use shorthand names or symbols for keys that need it):



    'ctrl+shift+p' OR 'control+shift+P' OR '⌃+⇧+P'



If you wanted *either* control + shift + P *or* command + shift + P then you

would use the `/` key to separate the two:



    'ctrl+shift+p/cmd+shift+P'



If you wanted to only fire an event when the user has typed ctrl+shift+p

followed by the P key on it's own again, using a `,` to separate them, like

so:



    'ctrl+shift+p, p'



You could also mix sequences and optionals:



    'ctrl+shift+p/cmd+shift+p, p'



Also, since version 0.3, you can specify ranges:



    'ctrl+shift+[0-9], ctrl+shift+[num-0-num-9]'



This will automatically expand these to ctrl+shift+0, ctrl+shift+1 and so on.

Because these are worked out on the keyboard keycodes, they'll work many types

of ranges, such as:



    '[f1-f11], [num-3-num-7], [a-c], [g-f], [←-↓]' // (the last one matches all arrow codes)



If you have a complex pattern, it may be more readable to use an array literal

to express the combination. If you express it as an array, then the top level

array will delemit a sequence, while each value in the array can be a string,

which is parsed for commas, or an array which will delimit optionals.

In other words, the following are the same:



    [['ctrl+shift+p', 'cmd+shift+p'], 'p'] OR 'ctrl+shift+p/cmd+shift+p, p'



--------------------------------------------------------------------------------



jwerty.key

==========



    jwerty.key(jwertyCode, callbackFunction, [callbackContext]);



`jwerty.key` will attach an event listener and fire `callbackFunction` when

`jwertyCode` matches. The event listener is attached to `document`, meaning

it will listen for any key events on the page (a global shortcut listener). If

`callbackContext` is specified then it will be supplied as

`callbackFunction`'s context - in other words, the keyword `this` will be

set to `callbackContext` inside the `callbackFunction` function.



 - If `callbackFunction` returns `false` then preventDefault() will be

   called for the event, in other words - what the browser normally does when

   this key is pressed will not happen.



 - If `callbackFunction` can be a boolean (`true` or `false`), rather than an

   actual function. If it is a boolean, it will be treated like a function that

   instantly returns that value. This is useful if you just want to disable a

   key, for example: `jwerty.key('ctrl+V', false)` will disable ctrl+V's default

   behaviour.



    jwerty.key(jwertyCode, callbackFunction, [callbackContext], [selector, [selectorContext]]);



`jwerty.key` will attach an event listener and fire `callbackFunction` when

`jwertyCode` matches. The event listener is attached to `selector`.

`callbackContext` can be ommited if not needed, and `selector` becomes

the third argument. `selectorContext` is used to search for `selector`

within `selectorContext`, similar to jQuery's `$('selector', 'context')`.



 - `selector` can be a CSS1/2/3 selector - it will use

   document.querySelectorAll, unless you have jQuery, Zepto or Ender installed,

   in which case it will use those as the selector engine.

 - `selector` can be a DOM element (such as HTMLDivElement), or a jQuery

   element object, or a Zepto element object, or an Ender element object.

 - `selectorContext` has the same rules as `selector`, it can be a

   string, DOM element or jQuery/Zepto/Ender element object.



Both variants of this method will return a subscription handle `h`, by which you may undo the binding by calling `h.unbind()`



#### Example Usage

```javascript

// prevents 'ctrl+shift+p''s default action

jwerty.key('ctrl+shift+p', false);



// outputs "print!" to the console when pressed.

jwerty.key('ctrl+shift+p', function () { console.log('print!') });



// will work only once, then unbind itself

var subscriptionHandle = jwerty.key('ctrl+alt+k', function(){

  console.log('working...');

  subscriptionHandle.unbind();

});



// will prevent the shortcut from running, only when '#myInput' is in focus

jwerty.key('ctrl+shift+p', false, '#myInput');

```

--------------------------------------------------------------------------------



jwerty.event

==========



    jwerty.event(jwertyCode, callbackFunction, [callbackContext]);



`jwerty.event` will return a function, which expects the first argument to be a

key event. When the key event matches `jwertyCode`, `callbackFunction`

is fired. `jwerty.event` is used by `jwerty.key` to bind the function it returns.

`jwerty.event` is useful for attaching to your own event listeners. It can be

used as a decorator method to encapsulate functionality that you only want to

fire after a specific key combo. If `callbackContext` is specified then it

will be supplied as `callbackFunction`'s context - in other words, the

keyword `this` will be set to `callbackContext` inside the

`callbackFunction` function.



 - If `callbackFunction` returns `false` then preventDefault() will be

   called for the event, in other words - what the browser normally does when

   this key is pressed will not happen.



 - If `callbackFunction` can be a boolean (`true` or `false`), rather than an

   actual function. If it is a boolean, it will be treated like a function that

   instantly returns that value. This is useful if you just want to disable a

   key, for example: `jwerty.key('ctrl+V', false)` will disable ctrl+V's default

   behaviour.



#### Example Usage

```javascript

// prevents pasting in #myinput

$('#myinput').bind('keydown', jwerty.event('ctrl+v/cmd+v', false));



// great to use with Backbone JS view events:

events: {

    'keyup input': 'keyupInput'

},

keyupInput: jwerty.event('enter', function () {

    this.submit();

}),

```

--------------------------------------------------------------------------------



jwerty.is

==========



    jwerty.is(jwertyCode, event, [sequenceKey]);



`jwerty.is` will return a boolean value, based on if `event` matches

`jwertyCode`. `jwerty.is` is called by `jwerty.event` to check whether or

not to fire the callback. `event` can be a DOM event, or a

jQuery/Zepto/Ender manufactured event. The properties of `jwertyCode`

(speficially ctrlKey, altKey, metaKey, shiftKey and keyCode) should match

`jwertyCode`'s properties - if they do, then `jwerty.is` will return `true`.

If they don't, `jwerty.is` will return `false`.



 - If `jwertyCode` is a key sequence (e.g 'ctrl+c, d, e') then it will check

   the first part of the sequence unless you specify `sequenceKey`.

   `sequenceKey` needs to be an integer for the zero-indexed array of keys

   in the key sequence. So for example, running `jwerty.is(e, 'ctrl+c, d, e', 0)`

   will try to match `ctrl+c`, whereas `jwerty.is(e, 'ctrl+c, d, e', 1)` will

   try to match `d` and so on.



 - If `jwertyCode` includes optionals (e.g 'ctrl+shift+p/cmd+shift+p') it

   will look at both, and if either return a match then the return value will be

   `true`.



#### Example Usage

```javascript

// add "pasted" class when ctrl+v/cmd+v is pressed

$('#myinput').bind('keydown', function () {

    if (jwerty.is('ctrl+v/cmd+v')) {

        this.addClass('pasted');

    }

});

```

--------------------------------------------------------------------------------



jwerty.fire

==========



    jwerty.fire(jwertyCode, [selector, [selectorContext]], [sequenceKey]);



`jwerty.fire` will construct a keydown event to fire, based on `jwertyCode`.

The event will be fired against `selector`. `selectorContext` is used to

search for `selector` within `selectorContext`, similar to jQuery's

`$('selector', 'context')`.



 - `selector` can be a CSS1/2/3 selector - it will use

   document.querySelectorAll, unless you have jQuery, Zepto or Ender installed,

   in which case it will use those as the selector engine.

 - `selector` can be a DOM element (such as HTMLDivElement), or a jQuery

   element object, or a Zepto element object, or an Ender element object.

 - `selectorContext` has the same rules as `selector`, it can be a

   string, DOM element or jQuery/Zepto/Ender element object.



#### Example Usage

```javascript

// fire 'a' on body

jwerty.fire('a');



// fire 'a' on #myform input.name

jwerty.fire('a, b', 'input.name', '#myForm');



// fire 'b' on #myform input.name

jwerty.fire('a, b', 'input.name', '#myForm', 2);

```