Prototype Core team decided not to support encoding/decoding of nested
arrays/hashes in parameter strings for various reasons, so JSON is going
to be the way to go with this (and is better anyway). I don't know what
server-side platform you use, but in PHP a simple json_encode(<your data
structure here>) will convert any array/hash (including nesting) into a
JSON string. I recommend sending it through the body of the response,
not the X-JSON header because of header size limitations. So, on the
client-side, you can do this to get basically the exact same data
structure that you had on the server side into javascript:
var obj = transport.responseText.evalJSON();
So if what you passed to json_encode (or your equivalent) on the server
side was an array of hashes, "obj" would now be the same array of hashes
you had before and you can use Prototype Enumerables on it as you please.
Colin
Gareth Evans wrote:
> Hey Guys
>
> Re: Nested hashes/arrays of hashes
>
> I know Colin was talking about this some time back but I just wanted
> to clarify whether these actually work...
> I had a scenario where I wanted to return effectively an array of
> hashes (though nested hashes would be better) for metadata about form
> fields (to implement a cascading requirement)
>
> eg:
> Client sends "Field 1 changed to 2"
> Server replies with
> {fieldid:'fielda',properties:{required:true,label:'Field
> A'}},{fieldid:'fieldb',properties:{required:true,label:'Field B'}}
> (which in this case might be dependent on the fact that field1 has
> changed to 2, rather than 3 or 4)
> Client receives reply and loads the data and iterates through the
> received meta setting the various properties as appropriate.
>
> However, I wasn't sure what the format of the reply should be in order
> to implement such functionality.
> It doesn't need the nested hashes but I do need to return an array of
> hashes.
> I think I returned a 1 dimensional ~ seperated array and then split it
> to iterate but I'm sure there's a better way.
>
> Could someone give me an example of the reply and the method to get it
> into a hash, if not just $H(transport.responseText)
> I tried the $H method as well as the toJSON (or is it fromJSON, i cant
> remember)
>
> Gareth
>
> >
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