Is there any way to show or hide the Document Map dynamically depend on parameters?

hi, all
I have a class report with class no as paramter.
This parameter could be null. So, if users enter null, it will show all
of them for all classes. Otherwise, it will only show the data for that
class.
So, what I am thinking about is, if the parameter is null, report shows
all data, it will be very nice to show the Document Map on the left
side. If users entered class no, then there is only one class in this
report, no use to show or use the Document map, right?
Does anyone know how to do that?One idea is to call your report through a URL and pass rc=DocMap=true or
false
Med bouchenafa
"Nick" <nick_1394@.yahoo.com.cn> a écrit dans le message de news:
1137522580.946890.33140@.f14g2000cwb.googlegroups.com...
> hi, all
> I have a class report with class no as paramter.
> This parameter could be null. So, if users enter null, it will show all
> of them for all classes. Otherwise, it will only show the data for that
> class.
> So, what I am thinking about is, if the parameter is null, report shows
> all data, it will be very nice to show the Document Map on the left
> side. If users entered class no, then there is only one class in this
> report, no use to show or use the Document map, right?
> Does anyone know how to do that?
>