I'm trying to set up a web page which fires off a number of
simultaneous requests, and displays the results as they come in. Here's
my (very simple) attempt to do this, using loadJSONDoc. Basically, I
have a function which uses document.write (a hack for now, I know...)
to write out a placeholder span. Then it fires off a loadJSONDoc
request to get data from a CGI, with a callback to fill in the
placeholder.
When I run this with a couple of placeholders, the data gets refreshed
fine, but it seems that only one request is run at a time. Looking at
the processes on the box, one CGI starts up, but the second doesn't
start until the first is complete.
It looks like *something* is serialising my requests - precisely what I
don't want. What am I doing wrong?
Thanks,
Paul.
PS I can't afford to serialise, as my real app will have anything
between 50 and 100 such "delayed spans". I don't need to worry about
the load on my server, it's a lightly loaded intranet so 50-100
simultaneous CGIs won't kill it :-)
---- Sample code ----
<html>
<head>
<script type="text/javascript" src="/MochiKit/MochiKit.js"></script>
<script>
var id = 0;
function delayedSPAN(url, args, template) {
var d = loadJSONDoc(url, args);
var this_id = "delayedSPAN" + id;
id = id + 1;
document.write('<span id="' + this_id + '">Placeholder</span>');
var gotData = function(data) {
text = template.replace(/\{(\w+)\}/g,
function (str, name) {
return data[name];
});
sp = SPAN(text);
swapDOM(this_id, sp);
};
var getFailed = function(err) {
alert("Failed to get data!");
};
d.addCallbacks(gotData, getFailed);
}
</script>
<title>A MochiKit demo</title>
</head>
<body>
We get the duration:<br>
<script>delayedSPAN("/cgi-bin/test.py", {}, "Dur:
{duration}");</script>
<br>
<script>delayedSPAN("/cgi-bin/test.py", {}, "Second:
{duration}");</script>
<br>
in seconds.
<script>
</script>
</body>
</html>
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