Disable fields based on choice *that may have multiple choices*

Question

Is the title weird-sounding? It is to me. But, here's my situation:

I would like to disable (in some way, greying out, or whatever) certain fields in a list based upon a CHOICE field I've got at the start of the list. For example, if choice "A" is chosen, fields 1 and 2 are disabled, but field 3 is still enabled. (I believe that JS is the best approach to making this happen) However, here's the rub that makes this one different: This choice field has check boxes, and will allow for multiple choices to be checked at the same time. So, using the above example, if choices "A" and "B" are chosen, field 2 is disabled, but fields 1 and 3 are enabled. With this wrench in the works, any ideas on how to make this work? I'm completely stumped.

Answer 1

I think still you can do using javascript by getting the selected choice value from Choice field and enable or disable other fields based on condition.

if its Modern site sharepoint online then you can use Field Customizer to add additional Javascript functionlity. https://docs.microsoft.com/en-us/sharepoint/dev/spfx/extensions/get-started/building-simple-field-customizer

if its Classic site and above 2013 version then you can either go with Adding Content editor (not recommneded) or using JSlink concept to implement the same functionality.

https://code.msdn.microsoft.com/office/Client-side-rendering-JS-2ed3538a