Otter

Otter is a library to support collaborative realtime editing using Operational Transformation. It is available for several platforms and is designed to be integrated with your existing system.

Features

• Realtime editing of strings, maps and lists
• Support for multiple users concurrently editing the same content
• High-level API for working with realtime content
• Extendable with custom data types
• Annotation/marking support for strings

Planned Features

• Undo/redo support
• Helpers for easier sync implementation

Library implementations

• otter-java - Java 8 implementation for both servers and clients
• otter-js - JS implementation for Node and the browser

Browser example

var model = new otter.Model(new otter.engine.Editor(serverSync));
model.open()
    .then(function() {
        var title = model.get('title', function() {
            // This is run if title is not in the model
            return model.newString();
        });
        otter.model.bind.text(title, document.getElementById('text-input'));

        var users = model.get('users', function() {
            return model.newList();
        });

        users.on('insert', function(e) {
            // This will be called when something is added to the list
            console.log(e);
        });

        users.add({
            id: 'xFk12',
            name: 'Test'
        });
    });