p77 - 経済統計練習帳

<!DOCTYPE html>
<html lang="ja">
  <head>
    <meta charset="utf-8" />
    <title>Firebase</title>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.0.0-alpha1/jquery.min.js"></script>
    <script src="https://cdn.firebase.com/js/client/2.3.2/firebase.js"></script>
       <script src="sample.js"></script>
 
 
  </head>
  <body onload="sample()">
    <div>
      <input id="name" placeholder="名前" />
      <input id="message" placeholder="メッセージ" />
      <button id="send">投稿</button>
    </div>
    <ul id="messages">
    </ul>
  </body>
</html>
 
function sample(){
 
 var firebaseRef = new Firebase("https://my-first-chat-app.firebaseio.com"); // ... 1
      var messagesRef = firebaseRef.child('messages'); // ... 2
 
      // 既存メッセージを表示
      messagesRef.on('child_added', function(snapshot) { // ... 3
        var msg = snapshot.val();
        $('<li>').text(msg.name + ': ' + msg.body).prependTo('#messages');
      });
 
      $('#send').click(function() {
        messagesRef.push({ 
          name: $('#name').val(),
          body: $('#message').val()
        });
      });
 
      }