Hi all,
I've developed a custom FormComponent (by subclassing
FormComponentPanel) to act as a reference from one object to another (eg
a Customer to an Address), but am having problems figuring out how to
handle clear input (ie, if the user hits the cancel button on the form).
To explain a little further, the FormComponent is called EntityLink, and
renders the reference (eg the Customer's homeAddress) a hyperlink. I
have a button on the EntityLink panel allowing the user to perform a
search for other objects of the correct type, and then select it. Doing
this updates the EntityLink component, with a "pending" value (ie of the
new homeAddress). If the user hits the OK button, then the pending
value is copied over to the domain object (ie to the Customer's actual
homeAddress property).
In the cancel button's onSubmit() method I'm calling
getForm().clearInput(), which seems to use a visitor to call
clearInput() on all child FormComponent's. The FormComponent's
clearInput() method seems only to set the rawInput to a constant
(NO_RAW_INPUT), which looks like it's a magic value of some kind when
the form component is actually rendered - all rather low level.
I think what I'd like is to eagerly capture this clearInput so that I
can reset my EntityLink's hyperlink back to the original value and
discard the pending value. However, clearInput() is unfortunately
marked as final so there doesn't seem to be any easy way to capture this.
Looking at other implementations of FormComponentPanel (eg
DateTimeField) they are really very little other than wrappers around
simple FormComponents, so they don't offer any real clues.
Can anyone help me here, then?
Thanks
Dan
--
Dan Haywood
consultant, mentor, developer, author
agile, ddd, oo, java, .net, sybase
MA, MBCS, CITP, CEng
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/book: /Domain Driven Design using Naked Objects
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