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"></
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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