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W24 - Webhooks and Comet (Push/Pull Technology (Data Push (4 waves of data…

- - - - Webcasting, comet, push notif, WebSockets
- - - - <iframe> automatically creates a persistent onnection to receiveData.php
        
        When an update is available at server, send data to update control of client
      - index.php
        
        <iframe style="display:hidden;" src="http://localhost/comet/receiveData.php"></iframe>
        <span id="update"></span>
    - - whenever client makes request for update, server holds on the connection and provides response only when update available.
        client initiates another request as soon as response is received
      - index.php
        
        var ajax = new XMLHttpRequest();
        ajax.open("GET", "data.php")
        ajax.onload = function(){
        if (ajax.readyState ==4 OR ajax.status == 200){
        document.getElementById("update").innerHTML = ajax.responseText;
        receiveData();
        }
        }
        ajax.send();
        }
        receiveData();