custom links that work in both classic and lex
if you want a single custom link that works in classic or lightning, you need to create the links in a very simple visualforce page and embed the page in the page layout, which will show in classic and lex and looks pretty fine. you can make it look better if you really want.
note : you must set target = blank or target = top for the lightning portion of the link. if you do not specify target, or use self or parent, then opening the link in a new window will open the home page in lex.
if you try to use IF logic to evaluate UITheme on a custom link, it almost works, but it only works if you open in the same window. if you open in a new window, it will always evaluate to classic, and the known issue for this is marked as ‘no fix’. because of course…and you cannot prevent users from opening in new window.
the suggested workaround on the KI is to use a formula field. a formula...
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