[fpc-devel] fcl-web webdata ExtJS "total" field question

Michael Van Canneyt michael at freepascal.org
Sat Aug 21 12:05:54 CEST 2010

On Sat, 21 Aug 2010, BoBo wrote:

> ...snip...
>>> The only thing I've noticed is that with XML the "text" MySQL fields
>>> are not coming over to ExtJS, they only say "(MEMO)" . Is that because
>>> XML does not allow UTF8 or something?
>> No, this is a bug. I fixed it already in JSON (since I use that), but
>> not yet in XML.
>>> Some non-"text" fields are also displaying strange characters with XML
>>> where with JSON everything is good.
>> That is an encoding issue. The XML components need to know what kind of
>> codepage you use. I think we'll have to introduce a property for this in
>> the dataformatter. It will introduce some overhead :/
>> Michael.
> Yes, I will use JSON in my project also, it seems much better and easier, I 
> was just testing both. XML is a lot of overhead and bloat in any project both 
> development, execution and data-size-wise.

Exactly my thoughts :-)

> I did some testing on the exception catching, but if I intentionally do 
> something nasty within my Except/End part, FCL-Web replies with a web page 
> ("Module error", or something similar), and not a JSON reply so ExtJS cannot 
> process the response.

You use simple actions ? Why not RPC-Handlers and a JSONRPCDispatcher ? 
That is what catches the error, plus it can create an Ext.Direct API.

The idea is that you have 1 JSONRPCDispatcher, and several RPC-Handlers.
The request must be directed to the JSONRPCDispatcher, it will find the
correct RPC-Handler, let it execute the request, and then returns the 
result as JSON to the browser. If an execution error happens in the
RPC-Handler, it will be transformed to an appropriate response.


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