How to enable a user to select multiple values in an App

[Jon_Smith]

Hi all,

I have a scenario where the end user has a list of customer codes. Depending on their needs they might want to select a single customer code or a dozen for the robot to process. I have all of this set up nicely except for the method for the end user to initially provide input to the robot.
I have all these customer codes stored in the Data Service under an Entity.

I was hoping in the Apps I would be able to somehow use a Listbox where I could select multiple items, but sadly this isn’t the case. I can only select one at a time.

I have looked using the listbox events to do something, but there is only one event when an item is clicked on (i’d prefer a double click).
Even using that event, its hard to build a variable that contains the JSON Ienumerable I’d need to make for the process input because the function builder doesn’t seem to escape quotation marks correctly and I’d need something like
[“code1”,“code5”,“code10”]
But I am unable to do this so far…

I’m generally looking for insight and ideas. I don’t have much experience in App Studio so hoping someone else with more experience might be able to drop a few ideas.

Thanks in advance.

Jon Smith