> > In the chatdemo, what tells it to link the messages ThinArray
> > _javascript_
> > object, to the query returned byrobject.getMessages (that I can see
> > calls a
> > web service) ?
> On Tue, 2004-04-06 at 10:40, Dick Applebaum wrote:
> // sets up a thin array object named message
> var messages = new ThinArray();
>
> // creates a DefaultHandler that specifies the messages object as
> //the target of the (to be issued) ws request
> dh = new DefaultHandler("messages");
>
> // invokes the ws passing lastid and chatroom, naming the dh handler
> // as the recipient
> robject.getMessages(
> lastid,
> xmlformat(document.chatform.room.value),
> dh.handle
> );
>
Those are the steps, but to add a bit so you know the skinny:
var messages = new ThinArray();
Obviously makes a thin array, you could also do ... = new Map() if you
were passing a native cf structure or ... = new List() if you were
passing a native cf array.
dh = new DefaultHandler("messages");
This is the begining to the answer. The default handlers job is to parse
the SOAP response from the web service and translate the cf data type to
the _javascript_ data type. (Note the variable name is passed in in
quotes.)
robject.getMessages(lastid, dh.handle);
This is, as you said, a web service call. The last parameter is the
handler (it is not defined in the cfc). It's a bit like passing a
pointer in C - the last variable should be the handler if you want to do
anything with the web service result.
After the call is made
alert(message);
will show you the new value.
BTW here is a quick cf-js data type mapping
CF JS
---------------------------
String String
Numeric parseInt(String), parseFloat(String) etc
Struct Map()
Array List()
Query ThinArray() and using the cfBAM.cfc on the
server
Cheers,
--
Rob <[EMAIL PROTECTED]>
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