there are 3 properties you can have 4D manage automatically (that is, read-only 
by code)

current item (typically an object)
current item position (typically numeric), and
selected items (typically a collection)

http://doc.4d.com/4Dv17/4D/17/List-box-specific-properties.300-3743666.en.html

use the 3rd one.

2018/07/30 0:27、John DeSoi via 4D_Tech 
<4d_tech@lists.4d.com<mailto:4d_tech@lists.4d.com>>のメール:

Is there a way to get all of the highlighted row numbers for a collection 
listbox? It seems you can only get the first highlighted row number via the 
currentItemPosition property. The selectedItems property would return a 
collection of highlighted items, but at best you would have to sequentially 
search the collection to determine the position for each object.



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