That's a good example of how jsonp can look like. Also, I wrote the last
post with my head screwed on backwards, I think :) To get jsonp, you can
just use response.out.write('/*'+foo+'*/') where foo is the json string.
Cheers,
PS
On Tue, Sep 9, 2008 at 10:18 PM, Davide Rognoni <[EMAIL PROTECTED]>wrote:
>
> JSON-P example:
>
> <script>
> function foo(json) {
> alert( json["responseData"]["translatedText"] );
> }
> </script>
>
> <script src="http://ajax.googleapis.com/ajax/services/language/
> translate?v=1.0&q=hello%20world&langpair=en%7Cit&callback=foo<http://ajax.googleapis.com/ajax/services/language/translate?v=1.0&q=hello%20world&langpair=en%7Cit&callback=foo>
> "></
> script>
>
> // -------------------------------------
> see the link
> http://ajax.googleapis.com/ajax/services/language/translate?v=1.0&q=hello%20world&langpair=en%7Cit&callback=foo
> .
> .
> .
> .
> -- Best Template Engine
> http://pyoohtml.appspot.com/best-template-engine
> .
> .
> .
> .
> On Sep 9, 9:01 am, "Peter Svensson" <[EMAIL PROTECTED]> wrote:
> > I didn't know that GAE / Django supported callbacks, but they're really
> not
> > needed, since you supply your own handler function in Dojo ('load').
> > If the json object is properly formatted, it will be returned as text and
> > evaluated by Dojo (since you're using handleAs:'json').
> >
> > So add a load function, and ditch the extraneous callbacks parameter;
> >
> > dojo.io.script.get({> url: "
> http://localhost:8080/rpc?";,
> > > content: {
> > > action: "Add",
> > > arg0: "1",
> > > arg2: "2",
> > > time: Date()
> > > },
> > > handleAs: "json",
> > > preventCache: true,
> > > error: function(text){
> > > alert("An error has occurred - " + text);
> > > return text;
> > > },
> > > load: function(response)
> >
> > {
> > // The response variable will now be a
> normal
> > js object referring to the evaluated json
> > }
> >
> > > });
> > > }
> >
> > Also, I changed 'text/json' to only 'json'. For security reasons you
> should
> > use jsonp, which assumes that all json is wrapped in a comment '/* ...
> */',
> > but you have to be sure the server does that as well :)
> >
> > A final note; You might not need to use dojo.io.script, which is only
> > required if you're loading cross-domain. If you're conecting back to the
> > same domain the page was loaded from, you can use dojo.xhrGet instead,
> which
> > is slightly quicker.
> >
> > .. I would also recommend that you use firebug (or the Dojo firebug lite
> > console for mentally challenged browsers, which pops up if you use
> > isDebug:true in djConfig, so you don't have to suffer alerts :)
> >
> > Cheers,
> > PS
> >
> > On Tue, Sep 9, 2008 at 8:49 AM, Bill <[EMAIL PROTECTED]> wrote:
> >
> > > I've been building some AJAX clients that call App Engine backends.
> > > I'm not sure what documentation your citing, but App Engine is just
> > > like any server out there. The standard webapp framework nicely
> > > handles GET, POST, and other HTTP actions/verbs. You can set the
> > > content header in your handler by doing this:
> >
> > > self.response.headers['Content-Type'] = 'text/javascript' # or
> > > 'application/json' if you think IE won't choke on it
> > > self.response.out.write(...some json...)
> >
> > > That's it. The hard part on the backend is the code that autoconverts
> > > datastore structures into json. In particular, you have to convert
> > > datetime and recurse down into lists and dictionaries and convert them
> > > to simple json types.
> >
> > > On Sep 8, 8:42 pm, Downtown <[EMAIL PROTECTED]> wrote:
> > > > Hi,
> >
> > > > I am attempting to write a GAE application using AJAX. It states:
> >
> > > > "In its most generic sense, an AJAX Request will have a function name
> > > > followed by any optional parameters, the last of which, if it is a
> > > > function, is an optional OnSuccess callback. So, lets write a
> function
> > > > that handles this:
> >
> > > > .........
> > > > (resulting in ......)
> >
> > >
> GEThttp://localhost:8080/rpc?action=Add&arg0=%221%22&arg1=%222%22&time=1...
> > > > ...."
> >
> > > > Where is the "OnSuccess" callback?? It is missing from the GET URL.
> > > > Can I assume the following is correct:
> >
> > >
> GEThttp://localhost:8080/rpc?action=Add&arg0=%221%22&arg1=%222%22&time=1...
> >
> > > > Also, can I assume on the server side:
> >
> > > > self.response.out.write(simplejson.dumps(result)).......will send the
> > > > response to myjavascriptfunction??
> >
> > > > If I am missing something fundamental, please explain. If not,
> please
> > > > update the example to include better documentation on the callback
> > > > function.
> >
> > > > P.S. If you help me fine tune your example I will post a Dojo
> > > > equivalent that would substantially reduce coding the AJAX GET. In
> > > > Dojo it would be as simple as:
> >
> > > > dojo.io.script.get({
> > > > url: "http://localhost:8080/rpc?";,
> > > > content: {
> > > > action: "Add",
> > > > arg0: "1",
> > > > arg2: "2",
> > > > time: Date(),
> > > > OnSuccess: "myjavascriptfunction"
> > > > },
> > > > handleAs: "text/json",
> > > > preventCache: true,
> > > > error: function(text){
> > > > alert("An error has occurred - " + text);
> > > > return text;
> > > > }
> > > > });
> > > > }
> >
> > > > Thanks!
> >
>
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