Thanks for all the posts. I have GET working very well. I had one
additional issue converting string to JSON object which was solved as
follows:
dojo.xhrGet({
url: myurl,
handleAs: "json",
load: function(response, ioArgs){
var myObject = eval('(' + response +
')');
myjsfunction(myObject);
},
error: function(response, ioArgs){
alert("An error occurred retrieving
the current feed from the
server cache.");
//dojo.byId("toBeReplaced").innerHTML =
"An error occurred,
with response: " + response;
return response;
}
});
On Sep 10, 12:52 am, "Peter Svensson" <[EMAIL PROTECTED]> wrote:
> 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=h...>
> > "></
> > script>
>
> > // -------------------------------------
> > see the link
> >http://ajax.googleapis.com/ajax/services/language/translate?v=1.0&q=h...
> > .
> > .
> > .
> > .
> > -- 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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