puf/index.html

## index.html
<html>
<head>
<script src="https://www.gstatic.com/firebasejs/3.0.0/firebase.js"></script>
<title>ZeroToApp</title>
<style>
  #messages { width: 40em; border: 1px solid grey; min-height: 20em; }
  #messages img { max-width: 240px; max-height: 160px; display: block; }
  #header { position: fixed; top: 0; background-color: white; }
  .push { margin-bottom: 2em; }
  @keyframes yellow-fade { 0% {background: #f2f2b8;} 100% {background: none;} }
  .highlight { -webkit-animation: yellow-fade 2s ease-in 1; animation: yellow-fade 2s ease-in 1; }
</style>
<script>
document.addEventListener('DOMContentLoaded', function() {
  // Step 0: HTML defined, variables for elements
  var messagesList = document.getElementById('messages'),
      textInput = document.getElementById('text'),
      sendButton = document.getElementById('send'),
      login = document.getElementById('login'),
      googleLogin = document.getElementById('google'),
      facebookLogin = document.getElementById('facebook'),
      signedIn = document.getElementById('loggedin'),
      logout = document.getElementById('logout'),
      usernameElm = document.getElementById('username'),
      password = document.getElementById('password'),
      username = "Web";

  var config = {
    apiKey: "<copy from Firebase Console>",
    databaseURL: "<copy from Firebase Console>",
    storageBucket: "<copy from Firebase Console>",
    authDomain: '<copy from Firebase Console>'
  };

  // Get the Firebase app and all primitives we'll use
  var app = firebase.initializeApp(config),
      database = app.database(),
      auth = app.auth(),
      storage = app.storage();

  var databaseRef = database.ref().child('chat');

  sendButton.addEventListener('click', function(evt) {
    var chat = { name: username, message: textInput.value };
    databaseRef.push().set(chat);
    textInput.value = '';
  });

  // Listen for when child nodes get added to the collection
  databaseRef.on('child_added', function(snapshot) {
    // Get the chat message from the snapshot and add it to the UI
    var chat = snapshot.val();
    addMessage(chat);
  });

  // Show a popup when the user asks to sign in with Google
  googleLogin.addEventListener('click', function(e) {
    auth.signInWithPopup(new firebase.auth.GoogleAuthProvider());
  });
  // Allow the user to sign out
  logout.addEventListener('click', function(e) {
    auth.signOut();
  });
  // When the user signs in or out, update the username we keep for them
  auth.onAuthStateChanged(function(user) {
    if (user) {
      setUsername(user.displayName);
    }
    else {
      // User signed out, set a default username
      setUsername("Web");
    }
  });

  function handleFileSelect(e) {
    var file = e.target.files[0];

    // Get a reference to the location where we'll store our photos
    var storageRef = storage.ref().child('chat_photos');

    // Get a reference to store file at photos/<FILENAME>.jpg
    var photoRef = storageRef.child(file.name);

    // Upload file to Firebase Storage
    var uploadTask = photoRef.put(file);
    uploadTask.on('state_changed', null, null, function() {
      // When the image has successfully uploaded, we get its download URL
      var downloadUrl = uploadTask.snapshot.downloadURL;
      // Set the download URL to the message box, so that the user can send it to the database
      textInput.value = downloadUrl;
    });
  }
  file.addEventListener('change', handleFileSelect, false);


  function setUsername(newUsername) {
    if (newUsername == null) {
        newUsername = "Web";
    }
    console.log(newUsername);
    username = newUsername;
    var isLoggedIn = username != 'Web';
    usernameElm.innerText = newUsername;
    logout.style.display = isLoggedIn ? '' : 'none';
    facebookLogin.style.display = isLoggedIn ? 'none' : '';
    googleLogin.style.display = isLoggedIn ? 'none' : '';
  }

  function addMessage(chat) {
    var li = document.createElement('li');
    var nameElm = document.createElement('h4');
    nameElm.innerText = chat.name;
    li.appendChild(nameElm);
    li.className = 'highlight';
    if ( chat.message.indexOf("https://firebasestorage.googleapis.com/") == 0
      || chat.message.indexOf("https://lh3.googleusercontent.com/") == 0
      || chat.message.indexOf("http://pbs.twimg.com/") == 0
      || chat.message.indexOf("data:image/") == 0) {
      var imgElm = document.createElement("img");
      imgElm.src = chat.message;
      li.appendChild(imgElm);
    }
    else {
      var messageElm = document.createElement("span");
      messageElm.innerText = chat.message;
      li.appendChild(messageElm);
    }
    messagesList.appendChild(li);
    li.scrollIntoView(false);
    sendButton.scrollIntoView(false);
  }
  //window.app = app; // NOTE: just for debugging
  //for (var i=0; i < 10; i++) addMessage({ name: "Web", message: ''+i });
  setUsername('Web');
});
</script>
</head>
<body>
  <div id='header'>
    <label for='username'><img src="https://www.gstatic.com/images/icons/material/system/1x/account_box_black_24dp.png" width="24"/></label>
    <span id='username'></span>
    <span id='login'>
      <button id='google' class='idp-button'>Sign in with Google</button>
      <button id='facebook' class='idp-button'>Sign in with Facebook</button>
    </span>
    <button id='logout' class='idp-button'>Sign out</button>
  </div>
  <div class="push"></div>
  <ul id='messages'></ul>
  <div id='footer'>
    <img src="https://www.gstatic.com/images/icons/material/system/1x/add_a_photo_black_24dp.png" width="24"/>
    <input type="file" id="file" name="file" />
    <input id='text'></input>
    <button id='send'>Send</button>
  </div>
</body>
</html>
	<html>
	<head>
	<script src="https://www.gstatic.com/firebasejs/3.0.0/firebase.js"></script>
	<title>ZeroToApp</title>
	<style>
	#messages { width: 40em; border: 1px solid grey; min-height: 20em; }
	#messages img { max-width: 240px; max-height: 160px; display: block; }
	#header { position: fixed; top: 0; background-color: white; }
	.push { margin-bottom: 2em; }
	@keyframes yellow-fade { 0% {background: #f2f2b8;} 100% {background: none;} }
	.highlight { -webkit-animation: yellow-fade 2s ease-in 1; animation: yellow-fade 2s ease-in 1; }
	</style>
	<script>
	document.addEventListener('DOMContentLoaded', function() {
	// Step 0: HTML defined, variables for elements
	var messagesList = document.getElementById('messages'),
	textInput = document.getElementById('text'),
	sendButton = document.getElementById('send'),
	login = document.getElementById('login'),
	googleLogin = document.getElementById('google'),
	facebookLogin = document.getElementById('facebook'),
	signedIn = document.getElementById('loggedin'),
	logout = document.getElementById('logout'),
	usernameElm = document.getElementById('username'),
	password = document.getElementById('password'),
	username = "Web";

	var config = {
	apiKey: "<copy from Firebase Console>",
	databaseURL: "<copy from Firebase Console>",
	storageBucket: "<copy from Firebase Console>",
	authDomain: '<copy from Firebase Console>'
	};

	// Get the Firebase app and all primitives we'll use
	var app = firebase.initializeApp(config),
	database = app.database(),
	auth = app.auth(),
	storage = app.storage();

	var databaseRef = database.ref().child('chat');

	sendButton.addEventListener('click', function(evt) {
	var chat = { name: username, message: textInput.value };
	databaseRef.push().set(chat);
	textInput.value = '';
	});

	// Listen for when child nodes get added to the collection
	databaseRef.on('child_added', function(snapshot) {
	// Get the chat message from the snapshot and add it to the UI
	var chat = snapshot.val();
	addMessage(chat);
	});

	// Show a popup when the user asks to sign in with Google
	googleLogin.addEventListener('click', function(e) {
	auth.signInWithPopup(new firebase.auth.GoogleAuthProvider());
	});
	// Allow the user to sign out
	logout.addEventListener('click', function(e) {
	auth.signOut();
	});
	// When the user signs in or out, update the username we keep for them
	auth.onAuthStateChanged(function(user) {
	if (user) {
	setUsername(user.displayName);
	}
	else {
	// User signed out, set a default username
	setUsername("Web");
	}
	});

	function handleFileSelect(e) {
	var file = e.target.files[0];

	// Get a reference to the location where we'll store our photos
	var storageRef = storage.ref().child('chat_photos');

	// Get a reference to store file at photos/<FILENAME>.jpg
	var photoRef = storageRef.child(file.name);

	// Upload file to Firebase Storage
	var uploadTask = photoRef.put(file);
	uploadTask.on('state_changed', null, null, function() {
	// When the image has successfully uploaded, we get its download URL
	var downloadUrl = uploadTask.snapshot.downloadURL;
	// Set the download URL to the message box, so that the user can send it to the database
	textInput.value = downloadUrl;
	});
	}
	file.addEventListener('change', handleFileSelect, false);


	function setUsername(newUsername) {
	if (newUsername == null) {
	newUsername = "Web";
	}
	console.log(newUsername);
	username = newUsername;
	var isLoggedIn = username != 'Web';
	usernameElm.innerText = newUsername;
	logout.style.display = isLoggedIn ? '' : 'none';
	facebookLogin.style.display = isLoggedIn ? 'none' : '';
	googleLogin.style.display = isLoggedIn ? 'none' : '';
	}

	function addMessage(chat) {
	var li = document.createElement('li');
	var nameElm = document.createElement('h4');
	nameElm.innerText = chat.name;
	li.appendChild(nameElm);
	li.className = 'highlight';
	if ( chat.message.indexOf("https://firebasestorage.googleapis.com/") == 0
	\|\| chat.message.indexOf("https://lh3.googleusercontent.com/") == 0
	\|\| chat.message.indexOf("http://pbs.twimg.com/") == 0
	\|\| chat.message.indexOf("data:image/") == 0) {
	var imgElm = document.createElement("img");
	imgElm.src = chat.message;
	li.appendChild(imgElm);
	}
	else {
	var messageElm = document.createElement("span");
	messageElm.innerText = chat.message;
	li.appendChild(messageElm);
	}
	messagesList.appendChild(li);
	li.scrollIntoView(false);
	sendButton.scrollIntoView(false);
	}
	//window.app = app; // NOTE: just for debugging
	//for (var i=0; i < 10; i++) addMessage({ name: "Web", message: ''+i });
	setUsername('Web');
	});
	</script>
	</head>
	<body>
	<div id='header'>
	<label for='username'><img src="https://www.gstatic.com/images/icons/material/system/1x/account_box_black_24dp.png" width="24"/></label>
	<span id='username'></span>
	<span id='login'>
	<button id='google' class='idp-button'>Sign in with Google</button>
	<button id='facebook' class='idp-button'>Sign in with Facebook</button>
	</span>
	<button id='logout' class='idp-button'>Sign out</button>
	</div>
	<div class="push"></div>
	<ul id='messages'></ul>
	<div id='footer'>
	<img src="https://www.gstatic.com/images/icons/material/system/1x/add_a_photo_black_24dp.png" width="24"/>
	<input type="file" id="file" name="file" />
	<input id='text'></input>
	<button id='send'>Send</button>
	</div>
	</body>
	</html>