Thank you . I have everything working. I appreciate your feedback.
On Sep 12, 3:16 pm, Adam Fisk <[EMAIL PROTECTED]> wrote:
> Couple of quick points here:
>
> 1) In your example (Downtown), you don't need to use eval. When you
> specify "handleAs: 'json'" the response is already JSON (already
> evaled underneath). You don't need to worry about YUI and all,
> although the commented format suggested above is ideal.
>
> 2) In response to Peter above, GAE only "supports callbacks" in the
> same sense that any server supports callbacks. You have to manually
> include the callback function in your response, as in "callbackFunc("
> + json + ")"
>
> -Adam
>
> On Sep 12, 11:23 am, Bill <[EMAIL PROTECTED]> wrote:
>
>
>
> > You might want to use Crockford's JSON utility instead of the naked
> > eval of the response. See the section "A word of caution against using
> > eval" on the YUI JSON page:http://developer.yahoo.com/yui/json/
>
> > The original non-YUI version can be used as well:http://json.org/json2.js
>
> > On Sep 12, 6:36 am,Downtown<[EMAIL PROTECTED]> wrote:
>
> > > 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!- Hide quoted text -
>
> - Show quoted text -
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