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Firebase Presence Example [JavaScript]

Forked from Firebase Leaderboard Example.

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praful 60

published 4 years ago

  <title>Presence Example</title>
  <meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
  <meta charset="utf-8">
  <script type="text/javascript" src="https://cdn.firebase.com/v0/firebase.js"></script>
  <script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>
  <script type="text/javascript" src="https://www.firebase.com/js/libs/idle.js"></script>
  <link rel="stylesheet" type="text/css" href="https://www.firebase.com/css/example.css">
<div id="presenceDiv"></div>
<script type="text/javascript">

  // Prompt the user for a name to use.
  var name = prompt("Your name?", "Guest"),
      currentStatus = "★ online";

  // Get a reference to the presence data in Firebase.
  var userListRef = new Firebase('https://presence-example.firebaseio-demo.com/');

  // Generate a reference to a new location for my user with push.
  var myUserRef = userListRef.push();

  // Get a reference to my own presence status.
  var connectedRef = new Firebase("http://presence.firebaseio-demo.com/.info/connected");
  connectedRef.on("value", function(isOnline) {
    if (isOnline.val()) {
      // If we lose our internet connection, we want ourselves removed from the list.

      // Set our initial online status.
      setUserStatus("★ online");
    } else {

      // We need to catch anytime we are marked as offline and then set the correct status. We
      // could be marked as offline 1) on page load or 2) when we lose our internet connection
      // temporarily.

  // A helper function to let us set our own state.
  function setUserStatus(status) {
    // Set our status in the list of online users.
    currentStatus = status;
    myUserRef.set({ name: name, status: status });

  // Update our GUI to show someone"s online status.
  userListRef.on("child_added", function(snapshot) {
    var user = snapshot.val();
    $("#presenceDiv").append($("<div/>").attr("id", snapshot.name()));
    $("#" + snapshot.name()).text(user.name + " is currently " + user.status);

  // Update our GUI to remove the status of a user who has left.
  userListRef.on("child_removed", function(snapshot) {
    $("#" + snapshot.name()).remove();

  // Update our GUI to change a user"s status.
  userListRef.on("child_changed", function(snapshot) {
    var user = snapshot.val();
    $("#" + snapshot.name()).text(user.name + " is currently " + user.status);

  // Use idle/away/back events created by idle.js to update our status information.
  document.onIdle = function () {
    setUserStatus("☆ idle");
  document.onAway = function () {
    setUserStatus("☄ away");
  document.onBack = function (isIdle, isAway) {
    setUserStatus("★ online");

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