Retrieving selected items from Lists--Visualization into datatable

Hello Everybody

Hope you're doing well. I'm writing you this message because I'm working on an interesting project called connected scales.

the whole idea consist of retrieving weighed data  from a scale that is connected to network in order to visualise this data in a mashup. 

scales are used by operators to weight many elements, so I added some features to be able to choose elements from a list before clicking the button Getweight because I need to associate every weighed data to a certain number of information like (Number of product, Type of product... etc). 

So I created drop down lists and two radio button lists that are associated one to another, the first one contain "Lots" and it is a string and the second one contains "Elements" and it is an infotable whiche enable me to associate different information to every Lot

For example : ( Lot1=> E1,E2,E3,E4), (Lot2 => E5,E6,E7,E8) ... etc)

Now the problem is that I don't really know if there is a way to retrieve selected data from all these lists and visualise it into datatable when I click the button "Getweight".

I used the service get datatableentries but it doesn't show the selected items, Do I need to manipulate this process by using rows or there is a much easier solution/architecture for this kind of process ? 

Thank you in advance for your share and help.