Reverse Ajax implementation using php

Question

I am looking to implement reverse ajax in my application which is using PHP and jquery. I have googled a bit about it and found XAJA but that seems to be a paid application. Is there an open source application available for the same or has someone implemented it?

Some pointers or hints would be very helpful.

Thanks in advance.

I have read about Comet but that needs intensive support from server side and as I have found, it does not perform well with apache server. — Ankit Jaiswal, Dec 31 '10 at 06:49
HTML5-style websockets seems to be interesting but needs support from browsers. As per the document currently only safari and chrome support it? — Ankit Jaiswal, Dec 31 '10 at 07:00

Amjad Masad · Answer 1 · 2010-12-31T08:45:22.567

I know of two types of reverse AJAX:
1- Polling
2- Pushing

I think polling is rather easier to implement, you just have your javascript make a regular request to the server every time interval, and when the server have some data for it it will respond. Its like a ping and some call it heartbeat, but its the very obvious solution for this problem. However it may easily overload the server.

EDIT Simple polling Example code:
Server-Side:

<?php
//pong.php php isn't my main thing but tried my best!
$obj = new WhatsNew();
$out = "";
if ($obj->getGotNew()){
    $types = new array();
    foreach ($obj->newStuff() as $type)
        {
            $new = array('type' => $type);
            $types[] = $new;
        }

    $out = json_encode($types);
}
else{
    $out = json_encode(array('nothingNew' => true));
}

Client-Side:

function ping(){
    $.ajax(
        {

            url : "pong.php",
            success : function (data){
                data = JSON.parse(data),
                if (data['nothingNew'])
                    return;
                for(var i in data){
                    var type = data[i]['type'];
                    if (type && incomingDataHandlers[type]){
                        incomingDataHandlers[type]();
                    }
                }


        });
}
incomingDataHandlers = {
    comments: function () {
        $.ajax({
            url: "getComments.php",
            method: "GET",
            data: getNewCommentRequsetData() // pass data to the server;
            success : function (data){
                //do something with your new comments
            }
        });
    },
    message: function (){
        $.ajax({
            url: "getMessages.php",
            method: "GET",
            data: getNewMessageRequestData() // pass data to the server;
            success : function (data){
                //do something with your new messages
            }
        });
    }
}
$(docment).ready(function () {
    setInterval(ping, 1000);
})

Thanks amjad, I know about these types. I am looking for some hint or pointers on how it can be implemented actually. — Ankit Jaiswal, Dec 31 '10 at 07:06
I have seen your code but that does not seem to be an example of polling or pushing. It a simple example of ajax request repeated after a fixed interval. — Ankit Jaiswal, Dec 31 '10 at 08:32

score 1 · Answer 2 · edited May 23 '17 at 11:45

1

You are looking for what they call "long poll" - I did a "long poll php" and I got this thread on stack overflow:

How do I implement basic "Long Polling"?

edited May 23 '17 at 11:45

Community

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1

answered Dec 31 '10 at 09:29

Knubo

8,333
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thanks knubo, looks good. However, I have got another good link. Check this http://www.ape-project.org/home.html may be it helps you in future. – Ankit Jaiswal Dec 31 '10 at 10:23
I will surely try your solution as well. – Ankit Jaiswal Dec 31 '10 at 10:24

score 0 · Answer 3 · answered Dec 31 '10 at 18:57

you could websockets in conjuction with "flash" websockets because almost all browser have flash on board(average around 96%? => http://www.statowl.com/flash.php) => https://github.com/gimite/web-socket-js. You could use this together with http://code.google.com/p/phpwebsocket/. Still I am wondering if the performance is going to be any good. If it all possible I would use node.js to do reverse ajax. http://socket.io is a really cool project to do this!

score 0 · Answer 4 · answered Mar 13 '12 at 07:22

0

Have you checked APE ?

Its a push based real-time data streaming technology over a single low volume ajax connection. The concept is useful, you may be able to replicate the same thing with your server-side implementation

answered Mar 13 '12 at 07:22

kishu27

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Reverse Ajax implementation using php

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