On Wed, Jan 13, 2010 at 11:49:43PM +0100, Henrik Sarvell wrote: > (panel T (pack ,"Customer/Supplier" " @1") '(may Delete) '(choCuSu) 'nr > '+CuSu) > > The 'nr '+CuSu part, is it necessary, what is it used for in the panel, what > happens if there is an +Entity without an increasing +Key +Number?
It generates the "<<<" and ">>>" links on the top right, which allow to step to next and previous objects of the same type. The attribute (here 'nr') and class (here '+CuSu') may specify _some_ index tree to locate these objects. This doesn't have to be a '+Key' index, but can be any index that covers all desired objects. Alternatively, this attribute/class combination might also specify a '+Joint' relation that resolves to a (+List +Joint) on the other end. In that case, the "<<<" and ">>>" links will refer to the next and previous objects in that list in the referred object. > (<table> 'chart (choTtl ,"Customers/Suppliers" 'nr '+CuSu) > > Here the number only seems to be used to generate a proper title, however > the question is the same as above, could NIL be passed in a worst case > scenario? Yes, it generates a title like "12345 Customers/Suppliers", where the count 12345 is taken from that index tree. So this attribute/class combination should specify a '+Key' or '+Ref' index (but not an '+Idx', as this holds more than one entry per object, resulting in a wrong count). If you don't have any appropriate index, you could leave out 'choTtl' and just pass the plain title ,"Customers/Suppliers" to '<table>'. Cheers, - Alex -- UNSUBSCRIBE: mailto:picol...@software-lab.de?subject=unsubscribe
