> What am I doing wrong?

You're just looking in the wrong place. The second parameter to the
onSuccess callback is the value of the X-JSON *header*, if any. It's a
means of sending back extra data alongside the main response. You're
sending JSON back in the body, not a header. To access that, just look
at the `responseJSON` property of the response object (the first
parameter to the onSuccess). E.g.:

    new Ajax.Request(url, {
        onSuccess: function(response) {
            // The decoded JSON data is available from
            // the response.responseJSON property.

([OT] You've called your first parameter "transport", probably because
you've seen that in examples from a long time back. It's not the
transport, it's an Ajax.Response object. And yes, the docs are wrong;
I've filed a ticket in Lighthouse about that.)

T.J. Crowder
Independent Software Consultant
tj / crowder software / com

On Dec 21, 11:55 am, Frédéric <f...@gbiloba.org> wrote:
> Hi,
> I'm making some tests with AJAX request to retreive json datas.
> I tried this example code:
>     new Ajax.Request('/exec.py', {
>         method: 'get',
>         onSuccess: function(transport, json) {
>             alert(json ? Object.inspect(json) : "no JSON object");
>         }
>     });
> My request is made on a mod_python page, which returns the json data:
>     records = Adherent.selectBy(adherent='Oui')  # SQLObject request
>     req.content_type = "application/json"
>     data = [{'num': record.num,
>              'prenom': record.prenom,
>              'nom': record.nom} for record in records]
>     req.write(simplejson.dumps(data))
>     return ""
> But it does not work: the json var doesn't contain any valid json data...
> What am I doing wrong? Is the content_type correct? I found on different
> forums that this is the one to use for json, but Prototype may need another
> one? I also tried:
>     application/x-json
>     text/x-json
> without success.
> Thanks,
> --
>    Frédéric


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