Can I use an observer to change a dropdown list

I have an json file with exiftool information for several images.

Now I choose the file with a browse button and fill the needed image number manually.

I was wondering if it's possible, with an observer:

when the file is choosen can I then update the dropdown list with new values ?

The idea is to populate the dropdown list with values (image numbers) from the choosen file.

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Correct answer johnrellis

You don't need an observer to do this -- just use bound values. The popup menu is defined as:

f:popup_menu {value = bind "selected", items = bind "items"}

The code that selects and reads the file:

local paths = LrDialogs.runOpenPanel {...}
...read the JSON file...
...construct the array of items for the popup...
prop.items = items

johnrellisCorrect answer

Legend

You don't need an observer to do this -- just use bound values. The popup menu is defined as:

f:popup_menu {value = bind "selected", items = bind "items"}

The code that selects and reads the file:

local paths = LrDialogs.runOpenPanel {...}
...read the JSON file...
...construct the array of items for the popup...
prop.items = items

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