NoDataBehaviors And RAP

rbuser

I have a end-user/RAP/DADE environment with the TppReport NoDataBehaviors =
[ndMessageOnPage, ndBlankReport]. When the query gives no data, no message
(and no report output) occurs. According to Help, this should output a
message. What am I doing wrong?

In RAP, the Report.OnNoData event shows:

procedure ReportOnNoData(aDialog : TObject; var aShowDialog :boolean;
DrawCommand : TObject; var aAddDrawCommand : Boolean);

begin
aShowDialog :=
aAddDrawCommand :=
end;

Can anyone provide an example of how these are used?

Tom

rbuser

I also should have asked how to cancel the report from within the
Report.OnNoData event?

nardmoseley

1. In my testing here the NoDataBehaviors property is working correctly.
Note that this is a published property. Therefore when you load a report
from .rtm or database, the NoDataBehaviors that were saved with the report
will be used. You can use the Report.Template.OnLoadEnd event to initialize
the NoDataBehaviors after a report is loaded. Perhaps that is what you need
to do here.

2. The RBuilder.hlp topic for TppReport.OnNoData contains a good
explaination of how this event is used. The aShowDialog is only applicable
when NoDataBehaviors includes ndMessageDialog and likewise the a
aAddDrawCommand is only applicable when NoDataBehaviors includes
ndBlankReport.

3. The NoDataBehaviors is not designed to enable a report to be cancelled.


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Nard Moseley
Digital Metaphors Corporation
www.digital-metaphors.com

rbuser

Nard:
initialize
need

The reports are stored in a database (with the NoDataBehaviors property set
properly). For some reason which I can't determine, they seem to have
disappeared when the report is reloaded. I discovered that I could set them
from RAP with a pass-through function called from Report.BeforePrint, which
gives the proper results (as documented.) I can find no reason that the
properties as saved are not there when the report is run. Is there anything
else that I could be doing that would affect them?

Tom

nardmoseley

I tried a simple example in which I created a report, configured the
NoDataBehaviors and then save the report to an .rtm. I then changed the
TppReport.NoDataBehaviors back to the defaults and wrote a Button OnClick
event-handler to load the .rtm and preview. The NoDataBehaviors saved to the
.rtm were restored properly.

Try creating a simple example and if it still is an issue, then send to
support@digital-metaphors.com in zip format and we can check it out.


--
Nard Moseley
Digital Metaphors Corporation
www.digital-metaphors.com

rbuser

rbuser

Sorry about the empty report - hand was quicker than the brain!

nardmoseley

Aha, now I understand the key concept that your are missing.

1. "Do the property settings in TppReport persist in the end-user
environment?"

No. Each time you load a report, the property settings that existed at the
time the report was saved are restored. Therefore the TppReport properties
are constantly being updated to reflect the report template that is loaded.

2. Note the following from my first response to you on this thread:

...when you load a report from .rtm or database, the NoDataBehaviors that
were saved with the report will be used. You can use the
Report.Template.OnLoadEnd event to initialize the NoDataBehaviors after a
report is loaded. Perhaps that is what you need
to do here.

3. ReportBuilder uses standard Delphi component streaming. When Delphi
components save/load their state, they save/load the values of all published
properties.



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