# beamer to show nested-subitem when all (non-nested) items covered

I am trying to get an alternating highlighting effect between \itemize items and subitems (which are just nested itemize items), but there is an issue in that when all of the non-nested items are hidden the nested subitem fails to show. The desired effect is that:

• Overlay #1: the non-nested items will be initially shown in full opacity while the nested subitem will be initially shown as transparent
• Overlay #2: the non-nested items are hidden as transparent items, while the nested sub-item is shown in full opacity
• Overlay #3: all items are shown in full opacity

A minimal working example to reproduce the issue (using code that reflects what I'm trying to achieve):

\documentclass{beamer}
\begin{document}
\setbeamercovered{transparent}
\begin{frame}
\begin{itemize}
\item<1,3>{outside}
\begin{itemize}
\item<2->{inside}
\end{itemize}
\item<1,3>{outside}
\end{itemize}
\end{frame}
\end{document}


Note that the issue seems to be specifically at the last non-nested item before the nested itemize environment. I.e., the issue above is that the sub-item fails perform the overlay spec of appearing at slide #2, but this spec works in the example below when the non-nested item above it is also displayed during slide #2 (instead of above where it is hidden during slide #2):

\documentclass{beamer}
\begin{document}
\setbeamercovered{transparent}
\begin{frame}
\begin{itemize}
\item<1->{outside}  % <---- this is the difference from above
\begin{itemize}
\item<2->{inside}
\end{itemize}
\item<1,3>{outside}
\end{itemize}
\end{frame}
\end{document}


Include \visible with your \items

\documentclass{beamer}
\begin{document}
\setbeamercovered{transparent}
\begin{frame}
\begin{itemize}
\item\visible<1,3>{outside}
\begin{itemize}
\item\visible<2->{inside}
\end{itemize}
\item\visible<1,3>{outside}
\end{itemize}
\end{frame}
\end{document}


• Thanks, this worked (although I use \uncover instead of \visible). – Daniel Naftalovich May 4 '16 at 0:51
• @DanielNaftalovich You're welcome. I wasn't sure if transparent meant covered or invisible, but I'm glad it worked for you. – erik May 4 '16 at 0:53

Here is a hack that almost accomplishes the intention, but non-ideal because the bullet does not become transparent (and also is a hassle to code)

\setbeamercovered{transparent}
\begin{frame}
\begin{itemize}
\item{\temporal<2>{outside}{\color{black!15}{outside}}{outside}}
\begin{itemize}
\item<->{inside}
\end{itemize}
\item<1,3>{later}
\end{itemize}
\end{frame}