Now in the BER: JSONP!

[Adam Tuttle]

This is undocumented as yet, but I just pushed it into master. I welcome any and all feedback. This is my first (second?) foray into jsonp, so there's a fair chance I'm not doing it right...

New setting: variables.framework.jsonp -- default value = false.

Change its value to a string, which will be the NAME of the request parameter (e.g. url param for GET requests) of the callback method wrapper... so given:

//This is probably the most common use, but it could just as easily be "goat"

variables.framework.jsonp = "callback";

And a request: http://api.example.com/index.cfm/stuff.json?callback=zomgdude

You would receive the same result as:

http://api.example.com/index.cfm/stuff.json

... except it would be wrapped in a call to zomgdude();

Such that if the response to the former was:

{"hello":"world"}

Then the response to the latter would be:

zomgdude({"hello":"world"});

---

So please feel free to play and test, report bugs, etc. Am I doing it completely wrong? Tell me that too!

You can see the changes I made to implement it, here: https://github.com/atuttle/Taffy/commit/9536dbd8

The only assumption I can think of that this implementation makes is:

• If you enable jsonp (by setting variables.framework.jsonp to anything other than false) then ANY time there's a request argument (url param or otherwise) with THAT name, the response WILL be wrapped in a callback of that name, regardless of the requested response type. This means that if your API supports BOTH XML and JSON(P) _and_ someone requests XML _and_ they specify a callback name, then they're going to get callback(xml-content)... Not ideal, but really it's their dumb fault. :P

Looking forward to your feedback!

Adam

P.S. ~ Do you think the default should be "callback" and you should have to explicitly disable it by setting it to false?

[Phil Cruz]

So I'm trying to use JSONP, the request looks correct. I can see "?callback=JQuery123432..."  In Application.cfc I have

variables.framework.jsonp = true;

in my resource I have

<cffunction name="post" access="public" output="false">

<cfargument name="message" type="string" required="false" default="no message passed"/>

<cfscript>

var result = structNew();

result.message = arguments.message;

return representationOf(result).withStatus(200);

</cfscript>

</cffunction>

But when I examine the response I just see:

{"MESSAGE":"testmessage"}

so the response isn't getting wrapped in the callback. What am I missing?

Thanks,

Phil

[Phil Cruz]

I meant Application.cfc has

variables.framework.jsonp = "callback";

-Phil

[Adam Tuttle]

Jsonp only works for GET requests. It is accomplished by injecting <script> tags into the document body, so POST,PUT,DELETE are not possible. Try it with a GET request and let me know if it works. :)

Adam

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[Phil Cruz]

Ah, so I see. It does work with a GET request. But if I actually want to do a POST cross-domain request then I can just use

variables.framework.allowCrossDomain = true;

and it works. Awesome.

Thanks,

Phil

[Adam Tuttle]

I will have to remember to come back to this discussion when writing the docs for the feature. :)

Adam