Rendering real-time data using jQuery's Ajax functionality

Question

Rendering real-time data using jQuery's Ajax functionality

Imagine having a webpage that gradually returns a large amount of data over time. Here's an example code snippet to illustrate this:

<?php

$iTime = time();

while(time()-$iTime < 10 ) {
    echo "Hello world";
    echo str_repeat( ' ', 1024 ) . "<br />";
    flush( );
    sleep(3);
}

?>

The goal is to display all incoming data in real-time, updating the content as it arrives. Essentially, once a line of data is sent, it should be parsed and displayed immediately.

Can this be achieved using jQuery? Any guidance would be greatly appreciated.

Thank you for your assistance! :)

javascript ajax

Answer 1

Answer №1

Creating a basic comet-style long poll is actually quite simple:

PHP:

<?php
    $data = null;
    while ($data ==  null)
    {
         $data = find_data($_REQUEST['last_update']); // This part is customizable.
         sleep(5);
    }
    echo json_encode($data);

JavaScript:

 function setListener()
 {
      $.ajax({
           url: 'updater.php',
       dataType: 'json',
       success: function(data, status, xhr) 
           {
              // Perform actions with the received data.
              setListener();
           },
       error: function()
           {
               setTimeout(setListener,10000);
           }
       });
 }

Answer 2

Creating a basic comet-style long poll is actually quite simple:

PHP:

<?php
    $data = null;
    while ($data ==  null)
    {
         $data = find_data($_REQUEST['last_update']); // This part is customizable.
         sleep(5);
    }
    echo json_encode($data);

JavaScript:

 function setListener()
 {
      $.ajax({
           url: 'updater.php',
       dataType: 'json',
       success: function(data, status, xhr) 
           {
              // Perform actions with the received data.
              setListener();
           },
       error: function()
           {
               setTimeout(setListener,10000);
           }
       });
 }

Answer 3

Answer №2

Check out the ajax-http-stream jQuery plugin. This plugin enhances jQuery ajax calls to handle comet-style data streaming from the server and triggers a function called OnDataReceived whenever new data is received.

Answer 4

Check out the ajax-http-stream jQuery plugin. This plugin enhances jQuery ajax calls to handle comet-style data streaming from the server and triggers a function called OnDataReceived whenever new data is received.

Answer 5

Answer №3

It seems like you've reached the limitations of the HTTP protocol itself, which means this is more about web programming than just jQuery. If you're looking for real-time push functionality, consider using a different protocol like XMPP (which big players like Google Wave use).

When working with jQuery, my suggestion would be to implement normal polling on efficient, low-power resources. You can easily create static resources that utilize HTTP caching effectively and follow principles of REST. For example:

setTimeout('myPoll("http://my_feed")', 500);
Ensure my_feed uses HTTP caching as a static method (perhaps personalized per user if necessary)

Answer 6

It seems like you've reached the limitations of the HTTP protocol itself, which means this is more about web programming than just jQuery. If you're looking for real-time push functionality, consider using a different protocol like XMPP (which big players like Google Wave use).

When working with jQuery, my suggestion would be to implement normal polling on efficient, low-power resources. You can easily create static resources that utilize HTTP caching effectively and follow principles of REST. For example:

setTimeout('myPoll("http://my_feed")', 500);
Ensure my_feed uses HTTP caching as a static method (perhaps personalized per user if necessary)

Rendering real-time data using jQuery's Ajax functionality

Answer №1

Answer №2

Answer №3

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