Google Choice: HTML5 - Server Sent Events

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Thursday, February 23, 2017

HTML5 - Server Sent Events

Server Sent Events

It takes the updates from server and gives result on web browsers.Before take updates from server,browser would have to ask, if any updates were available in web servers.

Example

HTML5 code should be as follows

<html>
   <body>
   
      <h1> Server updates</h1>
      <div id="result"></div>
   
      <script>
         if(typeof(EventSource) !== "undefined") {
            var source = new EventSource("demo_sse.php");
         
            source.onmessage = function(event) {
               document.getElementById("result").innerHTML += event.data + "<br>";
            };
         }
      
         else {
            document.getElementById("result").innerHTML = "Sorry, your browser does not support ";
         }
      </script>
   </body>
</html>

demo_sse.php

Server Code should be in PHP,It looks like as follows

<?php
   header('Content-Type: text/event-stream');
   header('Cache-Control: no-cache');
   
   $time = date('r');
   echo "data: The server time is: {$time}\n\n";
   flush();
?>

The server time is: Thu, 23 Feb 2017 20:20:22 +0530
The server time is: Thu, 23 Feb 2017 20:20:30 +0530
The server time is: Thu, 23 Feb 2017 20:20:37 +0530
The server time is: Thu, 23 Feb 2017 20:20:44 +0530
The server time is: Thu, 23 Feb 2017 20:20:50 +0530
The server time is: Thu, 23 Feb 2017 20:20:56 +0530
The server time is: Thu, 23 Feb 2017 20:21:02 +0530
The server time is: Thu, 23 Feb 2017 20:21:10 +0530
The server time is: Thu, 23 Feb 2017 20:21:16 +0530
The server time is: Thu, 23 Feb 2017 20:21:22 +0530
The server time is: Thu, 23 Feb 2017 20:21:28 +0530
The server time is: Thu, 23 Feb 2017 20:21:34 +0530
The server time is: Thu, 23 Feb 2017 20:21:40 +0530
The server time is: Thu, 23 Feb 2017 20:21:45 +0530
The server time is: Thu, 23 Feb 2017 20:21:52 +0530
The server time is: Thu, 23 Feb 2017 20:21:57 +0530
The server time is: Thu, 23 Feb 2017 20:22:03 +0530
The server time is: Thu, 23 Feb 2017 20:22:09 +0530
The server time is: Thu, 23 Feb 2017 20:22:15 +0530
The server time is: Thu, 23 Feb 2017 20:22:20 +0530
The server time is: Thu, 23 Feb 2017 20:22:26 +0530

You can get demo of Server Sent Events here

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