I have found this recent thread:
http://groups.google.com/group/web2py/browse_thread/thread/80941011f6407703/5047c1417c35b125#5047c1417c35b125
But I'm still not entirely sure what the net result is for multiple
controller calls, via ajax or otherwise.
What exactly does the -n option allow in terms of threading and
handling requests in parallel?
On May 24, 8:47 pm, eddie <eddie.sh...@gmail.com> wrote:
> Hi guys,
>
> I'm looking for some help on allowing controller functions to respond
> to ajax calls from a view in parallel. I've got my head around the
> basic web2py architecture, but this is my first time trying out ajax
> in web2py.
>
> Here's the problem. I have a simple view that makes a number of ajax
> calls, to provide delay loading of data. The results are from querying
> and parsing URLs on demand, so they can be slow. The controller
> function I am calling (default/results_data) appears to be blocking,
> only executing one request at a time. This obviously defeats the
> purpose of delay loading the data on the page.
>
> I have made sure I am running the web2py app locally with the -n
> option (for threads), but this isn't the issue. I have found the
> session.forget() call, but this isn't it either.
>
> I am guessing there is something fundamental that I am doing wrong
> here, I am hoping someone can clarify what is required to allow the
> controller functions that respond to the ajax query to execute in
> parallel, without blocking.
>
> A snippet from the html generated by the view:
>
> function sendRequest(url,callback,postData) {
> try {
> var req = createXMLHTTPObject();
> if (!req) return;
> var method = (postData) ? "POST" : "GET";
> req.open(method,url,true);
> req.setRequestHeader('User-Agent','XMLHTTP/1.0');
> if (postData)
>
> req.setRequestHeader('Content-Type','application/x-www-form-
> urlencoded');
> req.onreadystatechange = function () {
> if (req.readyState != 4) return;
> if (req.status != 200 && req.status != 304) {
> alert('HTTP error ' + req.status);
> return;
> }
> callback(req);
> }
>
> if (req.readState == 4) return;
> req.send(postData);
> }
> catch (e) {
> throw e;//alert(e);
> }}
>
> ...
> <script>
> function source1_results(req)
> {document.getElementById('query1_results').innerHTML =
> req.responseText;}
> sendRequest('/myapp/default/results_data?
> query=foo&source_name=source1', source1_results)
> function souce2_results(req)
> {document.getElementById('source2_results').innerHTML =
> req.responseText;}
> sendRequest('/myapp/default/results_data?
> query=foo&source_name=source2', source2_results)
> </script>
> ...
> <table>
> <tr><td>source1</td><td id="source1_results">Loading...</td><td><a
> href="http://...";>View page</a></td></tr>
> <tr><td>source2</td><td id="source2_results">Loading...</td><td><a
> href="http://...";>View page</a></td></tr>
> </table>
