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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