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I'm writing an AJAX web app that uses Comet/Long Polling to keep the web page up to date, and I noticed in Chrome, it treats the page as if it's always loading (icon for the tab keeps spinning).
I thought this was normal for Google Chrome + Ajax because even Google Wave had this behaviour.
Well today I noticed that Google Wave no longer keeps the loading icon spinning, anyone know how they fixed this?
Here's my ajax call code
var xmlHttpReq = false; // Mozilla/Safari if (window.XMLHttpRequest) { xmlHttpReq = new XMLHttpRequest(); } // IE else if (window.ActiveXObject) { xmlHttpReq = new ActiveXObject("Microsoft.XMLHTTP"); } xmlHttpReq.open('GET', myURL, true); xmlHttpReq.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded'); xmlHttpReq.onreadystatechange = function() { if (xmlHttpReq.readyState == 4) { updatePage(xmlHttpReq.responseText); } } xmlHttpReq.send(null); 
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I shamelessly stole Oleg's test case and adjusted it a bit to simulate long-polling.
load.html:
<!DOCTYPE html> <head> <title>Demonstration of the jQery.load problem</title> <script src="http://code.jquery.com/jquery-latest.js"></script> <script> jQuery(document).ready(function() { $('#main').load("test.php"); }); </script> </head> <body> <div id='main'></div> </body> </html> test.php:
<?php sleep(5); ?> <b>OK!</b> The result is interesting: in Firefox and Opera, no loading indicator is shown during XMLHTTPRequests. Chrome lets it spinning... I suspect Google Wave doesn't use long polling anymore (but, for instance, polls every X seconds, to save resources), but I can't test it, as I don't have an account.
EDIT: And I figured it out: after adding a little delay in loading test.php, which can be as small as possible, the loading indicator stops after load.html has been loaded:
jQuery(document).ready(function() { setTimeout(function () { $('#main').load("test.php"); }, 0); }); Somehow, as is confirmed in a comment on another answer, when the browser gets control back to finish page rendering, the indicator stops spinning. Another advantage is that the request cannot be aborted by pressing Esc.
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