Add to list if not in list, remove from list if in list

georgecollier · 2025-02-03T16:06:36.039Z

I’m looking for a more efficient way to handle scenarios like repeating groups built as multi-select dropdowns.

I am sure there must be some obvious hack I’m missing, but I haven’t found it yet.

Scenario:

Store selected options in a repeating group or state variable
When user clicks a cell, need to toggle that option (add if not present, remove if present)

My current implementation (3 actions):

‘Is Selected’ custom event checks if option exists in list and returns data
If not in list: Display list with :plus item
If in list: Display list with :minus item

Is there a way to accomplish this toggle functionality in a single expression instead of three separate actions? If not, what do you think is the best way to do it?

hergin · 2025-02-03T17:12:45.715Z

Interesting question. I was always doing it as you explained as well. But I decided take this as a small challenge. I knew it was possible with the limited number of list operators Bubble has but I didn’t know how. I could finally find it after some half-hour effort It doesn’t look bad but efficiency should be checked I guess.

Here is how it is running in a single expression:
chrome_ZalrmQDLKh

Here is the expression:

image707×599 20.9 KB

And here is how I came up with it with some test cases

image1701×631 14.1 KB

And here is the editor if you want to play with it: Tests for Forum 14 | Bubble Editor

georgecollier · 2025-02-03T18:35:48.082Z

Blimey

Very well done.

system · 2025-04-14T16:06:47.513Z

This topic was automatically closed after 70 days. New replies are no longer allowed.