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HTML

              
                <div id="app"></div>
<!--
This demo shows just how fast you can get up and running with React and Firebase. We have a nicely equipped chat in ~ 300 lines of generousely spaced and commented ES6 JavaScript.

Dependencies:
  React
  Firebase
  moment
  markdown-it
-->
              
            
!

CSS

              
                *
  box-sizing: border-box

html, body, #app
  height: 100%
  overflow: hidden

body
  font-family: "Open Sans"
  
div.wrapper
  display: flex
  flex-flow: column
  height: 100%

div.main-window
  display: flex
  flex: 1
  
div.user-list-container
  flex: 1
  display: flex
  flex-flow: column
  border-left: 1px solid #ddd
  
  h2
    padding: 8px
    font-size: 12px
    text-align: center
    color: darken(white, 50%)
    border-bottom: 1px solid darken(white, 4%)
  
  .user-list
    flex: 1
    overflow-y: auto

  .user-list-item
    display: flex
    align-items: center
    font-size: 12px
    img
      margin: 5px
      border-radius: 50%
      
div.message-list-container
  background: darken(white, 4%)
  font-size: 13px
  flex: 2
  display: flex
  flex-flow: column
  
  .message-list
    flex: 1
    overflow-y: auto
    
  .message
    display: flex
    align-items: center
    padding: 0 10px
    
    img
      border-radius: 50%
      
    .message-text
      display: flex
      flex-flow: column
      flex: 3
      line-height: 1.3em
      padding: 10px
      
      strong
        font-weight: bold
      em
        font-style: italic
      a
        color: #336633
        
      .message-username
        font-weight: bold
        font-size: 14px
        margin-bottom: 4px
        a
          text-decoration: none
          color: black
          
        
        span.message-time
          font-weight: normal
          font-size: 12px
          color: #999
          
  .message-event
    display: flex
    justify-content: center
    text-align: center
    color: #aaa
    width: 100%
    font-size: 12px
    padding: 10px

.register-error
  background: red
  padding: 10px 10px 10px 15px
  font-size: 12px
  color: white
  
form
  display: flex
  justify-content: center
  
  input
    flex: 4
    border: 0
    padding: 10px
    border-top: 1px solid #ddd
    &:focus
      outline: 0
    
  button
    border: 0
    background: #55acee
    color: white
    font-size: 12px
    padding: 10px 10px 10px 34px
    font-family: 'Helvetica Neue'
    border-radius: 5px
    cursor: pointer
    font-weight: bold
    background-image: url(//g.twimg.com/Twitter_logo_white.png)
    background-position: 10px 50%
    background-size: auto 14px
    background-repeat: no-repeat
    
.wrapper > h1
  padding: 20px
  background: #222
  color: #eee
  display: flex
  justify-content: space-between
  align-items: center
  font-weight: bold
  
  .header-info
    font-size: 11px
    color: #ddd
    font-weight: normal
              
            
!

JS

              
                /**
 * Build up Firebase references
 */
const _fbBase = new Firebase('https://amber-heat-810.firebaseio.com');
const _fbMessages = _fbBase.child('messages');
const _fbUsers = _fbBase.child('users');

/**
 * Local cache of users in a Map
 * Used to track who is here.
 */
const _users = new Map();

/**
 * mardown-it instance to parse chat messages
 */
const _md = window.markdownit({
  linkify: true,
});

/**
 * Message Component
 * Renders an individual message or event in the list
 */
class Message extends React.Component {
  render() {
    /*
     * Run message through markdown-it.
     * dangerouslySetInnerHTML is necessary b/c React escapes HTML by defaukt
     */
    const messageText = <div dangerouslySetInnerHTML={{__html: _md.render(this.props.message.text)}} />;
    
    /**
     * Event messages
     * User has joined/left room
     */
    if (this.props.message.type === 'event') {
      // Buggy, removing for now.
      return null;

      // return <div className="message message-event">
      //   {messageText}
      // </div>;
    }
      
    return <div className="message">
      <img width="48" height="48" src={this.props.message.user_avatar} />

      <div className="message-text">
        <div className="message-username">
          <a target="_blank" href={'https://twitter.com/' + this.props.message.username}>{'@' + this.props.message.username}</a>
          {' '}
          <span className="message-time">
            {moment(this.props.message.timestamp).format('h:mma')}
          </span>
        </div>
        {messageText}
      </div>
    </div>;
  }
}

/**
 * MessageList Component
 * Renders the list of chat messages
 */
class MessageList extends React.Component {
  /**
   * Anytime new data comes in, scroll to bottom
   * TODO: Could be more intelligent here and only
   * scroll when user is not browsing back up the list.
   */
  componentDidUpdate() {
    let list = this.refs.messageList.getDOMNode();
    list.scrollTop = list.scrollHeight;
  }

  render() {
    return <div ref="messageList" className="message-list">
      {this.props.messages.map((message, index) => <Message
       		key={index}
          message={message}
          currentUser={message.userID === this.props.currentUserId} />)}
    </div>;
  }
}

class UserList extends React.Component {
  render() {
    return <div className="user-list-container">
      <h2>{this.props.users.length ? this.props.users.length : 'No'} user{this.props.users.length !== 1 ? 's' : ''} chatting</h2>
      
      <div className="user-list">
        {this.props.users.map((user) => <UserListItem user={user} />)}
      </div>
    </div>;
  }
}

class UserListItem extends React.Component {
  render() {
    return <div className="user-list-item">
      <img width="24" height="24" src={this.props.user.twitter.cachedUserProfile.profile_image_url_https} />
      {this.props.user._isCurrentUser ? 'You' : '@' + this.props.user.twitter.username}
    </div>;
  }
}
/**
 * MessageForm Component
 * Form input for adding new messages
 */
class MessageForm extends React.Component {
  componentDidMount() {
    this.refs.messageText.getDOMNode().focus();
  }

  /**
   * Submit the new Message
   * @param {object} event - onsubmit event
   */
  _onSubmit(event) {
    event.preventDefault();
  
    const user = _users.get(this.props.userId);
    const message = this.refs.messageText.getDOMNode().value.trim();
    
    if (!message.length) {
      return;
    }
    
    _fbMessages.push({
      type: "userMessage",
      user_avatar: user.twitter.cachedUserProfile.profile_image_url_https,
      username: user.twitter.username,
      text: this.refs.messageText.getDOMNode().value,
      timestamp: +new Date,
    });

    event.target.reset();
  }

  render() {
    return <form onSubmit={this._onSubmit.bind(this)}>
      <input ref="messageText" type="text" placeholder="Type your message. Be nice!" />
    </form>;
  }
}

/**
 * RegisterForm Component
 * Renders the registration form when a user enters the chat window
 */
class RegisterForm extends React.Component {
  render() {
    return <form onSubmit={this.props.onSubmit}>
      <button type="submit">Login with Twitter</button>
    </form>;
  }
}

/**
 * Application Component
 * Main component
 */
class Application extends React.Component {
  constructor() {
    super();
    this._messages = [];
    this._username = null;

    this.state = {
      messages: [],
      user: null,
      users: [],
      userId: null,
      joinError: null,
    };
  
    if (location.href.indexOf('fullpage') !== -1) {
      this.state.joinError = 'View this pen in the Editor in order to join the chat. Codepen\'s fullpage view blocks popups, so Twitter authentication does not work.';
    }
       
    this._join = this._join.bind(this);
    this._createUsersArray = this._createUsersArray.bind(this);
  }

  componentWillMount() {
    /**
     * onAuth fires anytime the auth status of this user changes
     */
    _fbBase.onAuth((authData) => {
      if (!authData) {
        return;
      }
      
      this._username = authData.twitter.username;
      
      _fbUsers.push(authData);

      this.setState({
        user: this._username,
        joinError: null,
      });
    });
    
    /**
     * Faster to call once.value, then listen to 
     * new children after that
     */
    _fbMessages.orderByKey().once('value', (dataSnapshot) => {
      dataSnapshot.forEach((snapshot) => {
        this._messages.push(snapshot.val());
      }); 
      
      this.setState({messages: this._messages});
      
      const last = this._messages[this._messages.length - 1];

      _fbMessages
        .orderByChild('timestamp')
        .startAt(last.timestamp + 1)
        .on('child_added', (snapshot) => {
          this._messages.push(snapshot.val());
          this.setState({messages: this._messages});
        });
    });
    
    _fbUsers.on('child_added', (snapshot) => {
      const key = snapshot.key();
      const userObj = snapshot.val();

      _users.set(key, snapshot.val());
      
      this._createUsersArray();
      
      if (userObj.twitter.username === this._username) {
        this.setState({userId: key});
        
        const disconnectListener = _fbUsers.child(key);
        disconnectListener.onDisconnect().remove();
      }
    });

    _fbUsers.on('child_removed', (snapshot) => {
      _users.delete(snapshot.key());
      
      this._createUsersArray();
    });
  }
  
  _createUsersArray() {
    let users = [];

    _users.forEach((user, key) => {
      user._isCurrentUser = user.twitter.username === this._username;
      users.push(user)
    });
    
    this.setState({users});
  }
    
  /**
   * Add the user to the chat
   * @param {object} event - the onsubmit event
   */
  _join(event) {
    event.preventDefault();
    
    _fbBase.authWithOAuthPopup("twitter", (error, authData) => {
      if (error) {
        this.setState({joinError: `Error authenticating with Twitter: ${error.message}`});
      } else {
        _fbMessages.push({
          type: "event",
          text: `@${authData.twitter.username} has joined the room`,
        });
      }
    }, {
      remember: "sessionOnly"
    });
  }

  render() {
    return <div className="wrapper">
      <h1>
        CHATPEN
        
        <div className="header-info">
          {this.state.user ? 
           `Chatting as @${this.state.user}` : 
            <RegisterForm 
              ref="registerForm"
              onSubmit={this._join} />}
        </div>
      </h1>
      
      <div className="main-window">
        <div className="message-list-container">
          <MessageList
            messages={this.state.messages}
            currentUserId={this.state.userId} />

          {this.state.userId ? 
            <MessageForm userId={this.state.userId} /> : null}
        </div>

        <UserList users={this.state.users} />
      </div>
        
      {this.state.joinError ? 
        <p className="register-error">{this.state.joinError}</p> : null}
    </div>;
  }
}

/**
 * Get this party started!
 */
React.render(<Application />, document.getElementById('app'));
              
            
!
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