Prevent a template from loading

rbuser

Hello,

I have a form which can print any kind of template loaded from a database.
In my case I have two templates - an invoice and just an order, off of the
same data. The user can load and print any template.

I want to prevent the user from loading and printing the invoice template,
if he hasn't entered all the needed fields for the template. Mind you, I
have no control over which template he will load (i.e. I can not just hide
certain templates before loading).

Is it possible to write such RAP code, that will prevent a certain template
from loading (most important is to disable the printing), based on some
random code INSIDE the template? The idea is that the user must not be able
to print an incorrect invoice with some important fields missing.

Thank you!

Dimitar Selenski

nardmoseley

As an example, I modified the RBuilder\Demos\EndUser\ReportExplorer as
follows:

1. Use OnFormCreate event of the end-user form to assign the
event-handler...

ppReport1.Template.OnLoadStart := LoadStartEvent;


2. Implement the event to perform the validation and raise an exception to
prevent the report template from being loaded

procedure TmyEndUserSolution.LoadStartEvent(Sender: TObject; aStream:
TStream);
begin
if (ppReport1.Template.DatabaseSettings.Name = 'Invoices') then
raise EReportBuilderError.Create('Access denied');
end;



--
Nard Moseley
Digital Metaphors Corporation
http://www.digital-metaphors.com