How to make section name uppercase in ToC?

Question

Is there another way to change section names in ToC to uppercase besides Uppercase sections and subsections on ToC Cause this one doesn't work for me very well. Can it be done with tocloft package?

Answer 1

Update: for a solution working with hyperref, see below.

An option, patching \l@section:

\documentclass{article}
\usepackage{etoolbox}

\makeatletter
\patchcmd{\l@section}{#1}{\MakeUppercase{#1}}{}{}
\makeatother

\begin{document}

\tableofcontents
\section{A test section}
\section{Another test section}

\end{document}

If your section titles contain math or commands (such as \label), it's best to use \MakeTextUppercase from the textcase package:

\documentclass{article}
\usepackage{textcase}
\usepackage{etoolbox}

\makeatletter
\patchcmd{\l@section}{#1}{\MakeTextUppercase{#1}}{}{}
\makeatother

\begin{document}

\tableofcontents
\section{A test section $a=b$}\label{sec:test}
\section{Another test section with a reference:~\protect\ref{sec:test}}

\end{document}

The solutions above won't work if the hyperref package is used. In this case, one can tamper with \contentsline (this borrows some code from Heiko Oberdiek's answer to this question in comp.text.tex):

\documentclass{article}
\usepackage{textcase}
\usepackage{hyperref}

\makeatletter
\let\oldcontentsline\contentsline
\def\contentsline#1#2{%
  \expandafter\ifx\csname l@#1\endcsname\l@section
    \expandafter\@firstoftwo
  \else
    \expandafter\@secondoftwo
  \fi
  {%
    \oldcontentsline{#1}{\MakeTextUppercase{#2}}%
  }{%
    \oldcontentsline{#1}{#2}%
  }%
}
\makeatother
\begin{document}

\tableofcontents
\section{A test section $a=b$}\label{sec:test}
\section{Another test section with a reference:~\ref{sec:test}}

\end{document}

The above approach also works using \MakeUppercase instead of \MakeTextUppercase; if this is so, then textcase is not necessary.