Code Enum Library

Code Enum Library is a TypeScript library that provides an exhaustive enum for keyboard event codes (KeyboardEvent.code). It allows for easy and consistent handling of keyboard inputs based on physical key positions across different layouts, alongside helpful utility functions to manage keyboard events.

• Code values source: MDN KeyboardEvent Code Values
• Data last updated: 2024-08-13

Inspired By

This library was inspired by the following projects, which offer similar functionality for key codes and keyboard event handling:

• ts-keycode-enum: Provides TypeScript enums for KeyboardEvent.keyCode values.
• ts-key-enum: Offers enums for KeyboardEvent.key, allowing developers to handle characters associated with key events in a standardized way.

Installation

Install the package via npm:

npm install keyboard-code-enum

Usage

Import the Code enum and/or the CodeUtils utilities as needed:

import { Code, CodeUtils } from 'keyboard-code-enum';

Example: Handling Keyboard Events

document.addEventListener('keydown', (event) => {
    const code = event.code as Code;

    if (CodeUtils.isLetterKey(code)) {
        console.log('A letter key was pressed');
    } else if (CodeUtils.isFunctionKey(code)) {
        console.log('A function key was pressed');
    } else if (CodeUtils.isModifierKey(code)) {
        console.log('A modifier key was pressed');
    } else if (CodeUtils.isMediaKey(code)) {
        console.log('A media key was pressed');
    } else {
        console.log('Other key:', code);
    }
});

API

Code Enum

The Code enum contains all standard keyboard event code values (e.g., KeyA, ArrowUp, Enter, F1, etc.), based on the MDN documentation.

import { Code } from 'keyboard-code-enum';

console.log(Code.KeyA); // Outputs: "KeyA"

CodeUtils Namespace

CodeUtils provides various helper functions to categorize and validate KeyboardEvent.code values.

CodeUtils.isLetterKey(code: Code): boolean

Checks if the code is a letter key (A-Z).

CodeUtils.isLetterKey(Code.KeyA); // true
CodeUtils.isLetterKey(Code.Digit1); // false

CodeUtils.isDigitKey(code: Code): boolean

Checks if the code is a numeric key (0-9 on main keyboard or numpad).

CodeUtils.isDigitKey(Code.Digit1); // true
CodeUtils.isDigitKey(Code.Numpad0); // true

CodeUtils.isFunctionKey(code: Code): boolean

Checks if the code is a function key (F1-F24).

CodeUtils.isFunctionKey(Code.F1); // true

CodeUtils.isNavigationKey(code: Code): boolean

Checks if the code is a navigation key (arrows, home, end, page up/down).

CodeUtils.isNavigationKey(Code.ArrowLeft); // true

CodeUtils.isModifierKey(code: Code): boolean

Checks if the code is a modifier key (Shift, Ctrl, Alt, Meta).

CodeUtils.isModifierKey(Code.ControlLeft); // true
CodeUtils.isModifierKey(Code.AltRight); // true

CodeUtils.isMediaKey(code: Code): boolean

Checks if the code is a media control key (volume, play, pause, etc.).

CodeUtils.isMediaKey(Code.MediaPlayPause); // true
CodeUtils.isMediaKey(Code.AudioVolumeMute); // true

CodeUtils.isValidCode(value: string): boolean

Validates if a given string is a valid Code value.

CodeUtils.isValidCode('KeyA'); // true
CodeUtils.isValidCode('InvalidKey'); // false

Contributing

Contributions are welcome! If you’d like to improve this library, please fork the repository, make your changes, and submit a pull request.

License

This project is licensed under the MIT License.