JavaScript State Machine

Abstract

State Machine is a library for managing a finite set of states, and moving between them via actions and transitions.

From its intuitive configuration through its powerful event-based architecture and rich API, State Machine makes it easy to describe and manage interaction with complex state-dependent systems like components, multi-step forms, purchase funnels, visualisations or games.

Features

State Machine has been designed from the outset to feel intuitive and fun to use:

• Easily-configurable via JavaScript config or instance methods
• DSL for shorthand transition and handler assignment
• Add and remove states and actions on the fly
• Pause, resume, cancel or end transitions at any point
• Handle system, state, action and transition events
• Rich API and system introspection
• Object-oriented architecture, fully-inspectable in DevTools

Demo

View the live demo at:

• statemachine.davestewart.io

To run / tinker with the demo locally, see the Development section.

Installation

State Machine can be used directly in the browser, or in a Browserify, Node or ES6 project.

Install via NPM using:

npm install state-machine

Note: If you are expecting the package wheeyls/stateMachine it has now been deprecated. To continue to use that package in your project, ensure you use the version 0.3.0 in your package.json.

Docs

View the documentation at:

• docs/readme.md

Development

Installation

Clone the repo using:

git clone https://github.com/davestewart/javascript-state-machine

Tasks

The following NPM tasks are available, via npm run <task>:

• dev - compile and watch the source to state-machine.js
• build - compile the source to state-machine.min.js
• demo - compile, watch and copy the development build to demo/ and serve demo files at http://localhost:8888
• test - run all tests

Testing

To run a single or set of tests, use the following syntax:

• npm run test -- --grep="<filename>"

Mentions

Inspired by @jakesgordon's JavaScript State Machine.

Special thanks to Michael Wheeler (@wheeyls) who very kindly donated the NPM package name state-machine.