Keybinding

A typescript library to handle hotkeys in browser.

Usage

$ yarn add keybinding

import Keybinding from 'keybinding';

const keybinding = new Keybinding();

keybinding.on('ctrl + a', () => {
    console.log('ctrl + a pressed!');
});

Supported Keys

Keybinding support function keys, common modifier keys and some special keys. You can use their handy name to bind event.

• Function keys: f1 - f12
• Shift: shift
• Meta: meta, windows, command, cmd
• Control: control, ctrl
• Alt: alt, option
• Space: space
• Arrow keys: up, down, left, right
• Backspace: backspace, back
• Enter: enter
• Alphabet keys: a - z and A - Z
• Number keys: 0 - 9
• Punctuation keys: `,-, +, [, ], \, ;, ', ,, ., /

API

construct options

interface IKeybindingOptions {
    /**
     * Do not call handler when focus on editable element.
     * Default to true.
     */
    filterEditable: boolean;
}

new Keybinding(options?: IKeybindingOptions);

on

Add a hotkey handler.

/**
 * @param key hotkey string
 * @param handler callback function when the hotkey pressed
 * @param scope the scope which bind at, use 'default' by default
 */
keybinding.on(key: string, handler: (keybind: Keybinding) => any, scope?: string): void

keybind.on('ctrl + a', () => {
    console.log('ctrl + a pressed')!
});

// Key is case-insensitive and space-trimming. Thus, the following two calls are equal.
keybind.on('cTRl    +       A', console.log);
keybind.on('ctrl+a', console.log);

off

Remove a hotkey handler.

/**
 * @param key hotkey string
 * @param handler callback function to remove
 * @param scope the scope which bind at, use 'default' by default
 */
keybinding.off(key: string, handler: (keybind: Keybinding) => any, scope?: string): void

keybind.off('ctrl + a', aBoundHandler);

Scopes are used to control whether handler should be called when the bound hotkey was pressed. See more detail in disable/enable method.

disable/enable

disable method will disable the given scope's handlers. All handlers under the given scope will not be called even if the hotkeys they bound was pressed until the enable method called.

/**
 * Disable given scope's hotkeys.
 * @param scope scope to disable, use 'all' by default
 */
keybinding.disable(scope?: string);
/**
 * Enable given scope's hotkeys
 * @param scope Scope to enable, use 'all' by default
 */
keybinding.enable(scope?: string);

// After pressing Control + A, handlerA won't be called but handlerB will still be called.
keybind.on('ctrl + a', handlerA);
keybind.on('ctrl + a', handlerB, 'scope2');
keybind.disable('default');

// You can choose to pass no parameter to disable all handler.
// In the following example, both handlerC and handlerD won't be called.
keybind.on('ctrl + a', handlerC, 'scope');
keybind.on('ctrl + a', handlerD, 'scope2');
keybind.disable();   // equal to keybind.disable('all')

// use enable to restore given  disabled scope
keybind.enable('scope1')    // enable 'scope1'
keybind.enable()            // enable all scope, equal to keybind.disable('all')

destroy

Destroy instance.

keybind.destroy();