add y-indexeddb section
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Kevin Jahns
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@ -85,6 +85,12 @@ document private.
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A module that contains a simple websocket backend and a websocket client that
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connects to that backend. The backend can be extended to persist updates in a
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leveldb database.
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</dd>
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<dt><a href="http://github.com/yjs/y-indexeddb">y-indexeddb</a></dt>
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<dd>
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Efficiently persists document updates to the browsers indexeddb database.
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The document is immediately available and only diffs need to be synced through the
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network provider.
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</dd>
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<dt><a href="http://github.com/yjs/y-dat">y-dat</a></dt>
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<dd>
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305
README.v12.md
305
README.v12.md
@ -1,305 +0,0 @@
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# 
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Yjs is a framework for offline-first p2p shared editing on structured data like
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text, richtext, json, or XML. It is fairly easy to get started, as Yjs hides
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most of the complexity of concurrent editing. For additional information, demos,
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and tutorials visit [y-js.org](http://y-js.org/).
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:warning: Checkout the [v13 docs](./README.md) for the upcoming release :warning:
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### Extensions
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Yjs only knows how to resolve conflicts on shared data. You have to choose a ..
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* *Connector* - a communication protocol that propagates changes to the clients
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* *Database* - a database to store your changes
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* one or more *Types* - that represent the shared data
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Connectors, Databases, and Types are available as modules that extend Yjs. Here
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is a list of the modules we know of:
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##### Connectors
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|Name | Description |
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|----------------|-----------------------------------|
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|[webrtc](https://github.com/y-js/y-webrtc) | Propagate updates Browser2Browser via WebRTC|
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|[websockets](https://github.com/y-js/y-websockets-client) | Set up [a central server](https://github.com/y-js/y-websockets-client), and connect to it via websockets |
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|[xmpp](https://github.com/y-js/y-xmpp) | Propagate updates in a XMPP multi-user-chat room ([XEP-0045](http://xmpp.org/extensions/xep-0045.html))|
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|[ipfs](https://github.com/ipfs-labs/y-ipfs-connector) | Connector for the [Interplanetary File System](https://ipfs.io/)!|
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|[test](https://github.com/y-js/y-test) | A Connector for testing purposes. It is designed to simulate delays that happen in worst case scenarios|
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##### Database adapters
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|Name | Description |
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|----------------|-----------------------------------|
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|[memory](https://github.com/y-js/y-memory) | In-memory storage. |
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|[indexeddb](https://github.com/y-js/y-indexeddb) | Offline storage for the browser |
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|[leveldb](https://github.com/y-js/y-leveldb) | Persistent storage for node apps |
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##### Types
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| Name | Description |
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|----------|-------------------|
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|[map](https://github.com/y-js/y-map) | A shared Map implementation. Maps from text to any stringify-able object |
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|[array](https://github.com/y-js/y-array) | A shared Array implementation |
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|[xml](https://github.com/y-js/y-xml) | An implementation of the DOM. You can create a two way binding to Browser DOM objects |
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|[text](https://github.com/y-js/y-text) | Collaborate on text. Supports two way binding to the [Ace Editor](https://ace.c9.io), [CodeMirror](https://codemirror.net/), [Monaco](https://github.com/Microsoft/monaco-editor), textareas, input elements, and HTML elements (e.g. <*h1*>, or <*p*>) |
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|[richtext](https://github.com/y-js/y-richtext) | Collaborate on rich text. Supports two way binding to the [Quill Rich Text Editor](http://quilljs.com/)|
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##### Other
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| Name | Description |
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|-----------|-------------------|
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|[y-element](http://y-js.org/y-element/) | Yjs Polymer Element |
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## Use it!
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Install Yjs, and its modules with [bower](http://bower.io/), or
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[npm](https://www.npmjs.org/package/yjs).
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### Bower
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```
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bower install --save yjs y-array % add all y-* modules you want to use
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```
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You only need to include the `y.js` file. Yjs is able to automatically require
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missing modules.
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```
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<script src="./bower_components/yjs/y.js"></script>
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```
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### CDN
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```
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<script src="https://cdn.jsdelivr.net/npm/yjs@12/dist/y.js"></script>
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<script src="https://cdn.jsdelivr.net/npm/y-array@10/dist/y-array.js"></script>
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<script src="https://cdn.jsdelivr.net/npm/y-websockets-client@8/dist/y-websockets-client.js"></script>
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<script src="https://cdn.jsdelivr.net/npm/y-memory@8/dist/y-memory.js"></script>
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<script src="https://cdn.jsdelivr.net/npm/y-map@10/dist/y-map.js"></script>
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<script src="https://cdn.jsdelivr.net/npm/y-text@9/dist/y-text.js"></script>
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// ..
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// do the same for all modules you want to use
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```
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### Npm
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```
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npm install --save yjs % add all y-* modules you want to use
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```
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If you don't include via script tag, you have to explicitly include all modules!
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(Same goes for other module systems)
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```
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var Y = require('yjs')
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require('y-array')(Y) // add the y-array type to Yjs
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require('y-websockets-client')(Y)
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require('y-memory')(Y)
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require('y-map')(Y)
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require('y-text')(Y)
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// ..
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// do the same for all modules you want to use
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```
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### ES6 Syntax
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```
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import Y from 'yjs'
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import yArray from 'y-array'
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import yWebsocketsClient from 'y-webrtc'
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import yMemory from 'y-memory'
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import yMap from 'y-map'
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import yText from 'y-text'
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// ..
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Y.extend(yArray, yWebsocketsClient, yMemory, yArray, yMap, yText /*, .. */)
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```
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# Text editing example
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Install dependencies
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```
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bower i yjs y-memory y-webrtc y-array y-text
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```
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Here is a simple example of a shared textarea
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```HTML
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<!DOCTYPE html>
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<html>
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<body>
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<script src="./bower_components/yjs/y.js"></script>
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<!-- Yjs automatically includes all missing dependencies (browser only) -->
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<script>
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Y({
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db: {
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name: 'memory' // use memory database adapter.
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// name: 'indexeddb' // use indexeddb database adapter instead for offline apps
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},
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connector: {
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name: 'webrtc', // use webrtc connector
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// name: 'websockets-client'
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// name: 'xmpp'
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room: 'my-room' // clients connecting to the same room share data
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},
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sourceDir: './bower_components', // location of the y-* modules (browser only)
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share: {
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textarea: 'Text' // y.share.textarea is of type y-text
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}
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}).then(function (y) {
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// The Yjs instance `y` is available
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// y.share.* contains the shared types
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// Bind `y.share.textarea` to `<textarea/>`
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y.share.textarea.bind(document.querySelector('textarea'))
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})
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</script>
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<textarea></textarea>
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</body>
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</html>
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```
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## Get Help & Give Help
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There are some friendly people on [](https://gitter.im/y-js/yjs?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge) who are eager to help, and answer questions. Please join!
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Report _any_ issues to the
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[Github issue page](https://github.com/y-js/yjs/issues)! I try to fix them very
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soon, if possible.
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# API
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### Y(options)
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* Y.extend(module1, module2, ..)
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* Add extensions to Y
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* `Y.extend(require('y-webrtc'))` has the same semantics as
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`require('y-webrtc')(Y)`
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* options.db
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* Will be forwarded to the database adapter. Specify the database adaper on
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`options.db.name`.
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* Have a look at the used database adapter repository to see all available
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options.
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* options.connector
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* Will be forwarded to the connector adapter. Specify the connector adaper on
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`options.connector.name`.
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* All our connectors implement a `room` property. Clients that specify the
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same room share the same data.
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* All of our connectors specify an `url` property that defines the connection
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endpoint of the used connector.
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* All of our connectors also have a default connection endpoint that you can
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use for development.
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* Set `options.connector.generateUserId = true` in order to genenerate a
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userid, instead of receiving one from the server. This way the `Y(..)` is
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immediately going to be resolved, without waiting for any confirmation from
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the server. Use with caution.
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* Have a look at the used connector repository to see all available options.
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* *Only if you know what you are doing:* Set
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`options.connector.preferUntransformed = true` in order receive the shared
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data untransformed. This is very efficient as the database content is simply
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copied to this client. This does only work if this client receives content
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from only one client.
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* options.sourceDir (browser only)
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* Path where all y-* modules are stored
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* Defaults to `/bower_components`
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* Not required when running on `nodejs` / `iojs`
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* When using nodejs you need to manually extend Yjs:
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```
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var Y = require('yjs')
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// you have to require a db, connector, and *all* types you use!
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require('y-memory')(Y)
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require('y-webrtc')(Y)
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require('y-map')(Y)
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// ..
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```
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* options.share
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* Specify on `options.share[arbitraryName]` types that are shared among all
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users.
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* E.g. Specify `options.share[arbitraryName] = 'Array'` to require y-array and
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create an y-array type on `y.share[arbitraryName]`.
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* If userA doesn't specify `options.share[arbitraryName]`, it won't be
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available for userA.
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* If userB specifies `options.share[arbitraryName]`, it still won't be
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available for userA. But all the updates are send from userB to userA.
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* In contrast to y-map, types on `y.share.*` cannot be overwritten or deleted.
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Instead, they are merged among all users. This feature is only available on
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`y.share.*`
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* Weird behavior: It is supported that two users specify different types with
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the same property name.
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E.g. userA specifies `options.share.x = 'Array'`, and userB specifies
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`options.share.x = 'Text'`. But they only share data if they specified the
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same type with the same property name
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* options.type (browser only)
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* Array of modules that Yjs needs to require, before instantiating a shared
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type.
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* By default Yjs requires the specified database adapter, the specified
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connector, and all modules that are used in `options.share.*`
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* Put all types here that you intend to use, but are not used in y.share.*
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### Instantiated Y object (y)
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`Y(options)` returns a promise that is fulfilled when..
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* All modules are loaded
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* The specified database adapter is loaded
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* The specified connector is loaded
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* All types are included
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* The connector is initialized, and a unique user id is set (received from the
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server)
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* Note: When using y-indexeddb, a retrieved user id is stored on `localStorage`
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The promise returns an instance of Y. We denote it with a lower case `y`.
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* y.share.*
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* Instances of the types you specified on options.share.*
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* y.share.* can only be defined once when you instantiate Y!
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* y.connector is an instance of Y.AbstractConnector
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* y.connector.onUserEvent(function (event) {..})
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* Observe user events (event.action is either 'userLeft' or 'userJoined')
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* y.connector.whenSynced(listener)
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* `listener` is executed when y synced with at least one user.
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* `listener` is not called when no other user is in the same room.
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* y-websockets-client aways waits to sync with the server
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* y.connector.disconnect()
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* Force to disconnect this instance from the other instances
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* y.connector.connect()
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* Try to reconnect to the other instances (needs to be supported by the
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connector)
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* Not supported by y-xmpp
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* y.close()
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* Destroy this object.
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* Destroys all types (they will throw weird errors if you still use them)
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* Disconnects from the other instances (via connector)
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* Returns a promise
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* y.destroy()
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* calls y.close()
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* Removes all data from the database
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* Returns a promise
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* y.db.stopGarbageCollector()
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* Stop the garbage collector. Call y.db.garbageCollect() to continue garbage
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collection
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* y.db.gc :: Boolean
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* Whether gc is turned on
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* y.db.gcTimeout :: Number (defaults to 50000 ms)
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* Time interval between two garbage collect cycles
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* It is required that all instances exchanged all messages after two garbage
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collect cycles (after 100000 ms per default)
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* y.db.userId :: String
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* The used user id for this client. **Never overwrite this**
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### Logging
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Yjs uses [debug](https://github.com/visionmedia/debug) for logging. The flag
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`y*` enables logging for all y-* components. You can selectively remove
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components you are not interested in: E.g. The flag `y*,-y:connector-message`
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will not log the long `y:connector-message` messages.
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##### Enable logging in Node.js
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```sh
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DEBUG=y* node app.js
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```
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Remove the colors in order to log to a file:
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```sh
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DEBUG_COLORS=0 DEBUG=y* node app.js > log
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```
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##### Enable logging in the browser
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```js
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localStorage.debug = 'y*'
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```
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## License
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Yjs is licensed under the [MIT License](./LICENSE).
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