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Issue with setTimeout in ajax based polling using jquery

Answer 1

+1 A:

I think rather than setTimeout you need to use setInterval

<html>
<head>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js"&gt;&lt;/script&gt;
    <script type="text/javascript">
        $(document).ready(function() {
            var startPoll = function() {
                $.post('url', {}, function(response) {
                    var responseObject = eval(response);

                    if (responseObject.success) {
                        alert('hi');
                    }
                }, 'json');
            }

            setInterval(startPoll, 5000); /*Make next polling request after 5 seconds*/

        });
    </script>
</head>
<body>
</body>
</html>

Phil 2009-12-06 11:36:19

Thanks for the reply Phil.setInterval didnt work either :(

johnswr 2009-12-06 11:40:20

I think it was your code, I've put an edited version in which works for me now.

Phil 2009-12-06 11:44:02

Answer 2

+2 A:

This is your problem:

setTimeout(startPoll(),5000);

You're calling startPoll immediately, not after 5 seconds. Instead, you should pass in the function reference, like so:

setTimeout(startPoll,5000);

If you want the polling to fire every 5 seconds even if previous polls didn't work (a server error was encountered), you should use setInterval instead. The code you have now is great if you want to be able to stop polling in case of errors.

Magnar 2009-12-06 11:52:42

Thanks Magnar, that fixed it ! :)

johnswr 2009-12-06 12:01:45

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Issue with setTimeout in ajax based polling using jquery

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