Edited book: Multiple authors in one chapter and Table of contents for the same

Question

I want to include the author name before the chapter title. I am using the following:

\documentclass{book}
\usepackage{titlesec}
\usepackage{titletoc}
\usepackage{lipsum}% just to generate some text

\makeatletter
  \newcommand*\l@authors{\@dottedtocline{1}{0pt}{0pt}}
\makeatother
\newcommand\chapaut[1]{%
  \addcontentsline{toc}{authors}{#1}%
  {\bfseries#1}\vskip35pt}

\titleformat{\chapter}[display]
  {\normalfont\huge\bfseries}{}{20pt}{\Huge}[\addvspace{5pt}]
\titlespacing*{\chapter}
  {0pt}{10pt}{0pt}
\titlecontents{chapter}
  [0pt]{\addvspace{10pt}}{\bfseries}{\bfseries}{}

\begin{document}
\tableofcontents

\chapter{Test chapter one}
\chapaut{The name of the first author, The name of second author and The name of the third author}
\lipsum[1-20]

\chapter{Test chapter two}
\chapaut{The First author and The second author}
\lipsum[1-20]

\end{document}

I want to change chapter with chapaut, so it will look like:

Also, in the table of contents:

Answer 1

if I understand you correctly, you want to achieve two things:

In the Tabel of Contents, you would like the author(s) of that chapter to be listed before the title of the chapter.

When the chapter is printed, you would also here, like to have the author(s) before the chapter title.

I think this might help, but I do believe there is a better way to do it, than this, especially for the ToC.

One other way to print the authors on top of the chaptertitle in the text, might be to change the definition of \chapter, but sometimes changing the definition of certain commands might have unforeseen sideeffects, so only do that if you know what you are doing. This question might be of interest: Start new chapter on same page.

EDIT: Really long chaptertitles, spanning multiple lines in the toc, will now be indentet on every line, instead of only the first.

\documentclass{book}
\usepackage{titletoc}
\usepackage{lipsum}% just to generate some text

% This part changes how chapters are displayed in the Table of COntents
\titlecontents{chapter}
  [0pt]% Left margin, optional
  {}% Code insertet above
  {\bfseries}% Numbered-entryformat
  {\bfseries}% Numberless-format
  {\contentspage\vskip1.5ex} %Below code, here: add dotfill and pagenumber for entry, and some vertical space between entries

% Custom command to keep the author on the same page of chaptertitle, and above it.  
\newcommand{\chapterAndAuthor}[2]{%
 % Takes the following input
 % #1: Author
 % #2: Chaptertitle
\clearpage%
    % Minipage to keep the author and chaptertitle on same page
    \noindent\begin{minipage}{\textwidth}
        % Set the author style
        {\bfseries#1}
        % Bring the chaptertitle a bit closer to the authrotitle
        \vspace{-3\baselineskip}
        % Add an entry to the Table of Contents, with the name of the author in italics and the chapter title
        \addcontentsline{toc}{chapter}{{\normalfont\itshape #1}\vspace{1ex}\newline%
        %To make long chapter titles spanning multiple lines indent on each line, a \parbox is created. This is siimply a box holding a wrapped paragraph at a certain length. Also, we need to move the dotfill here.
        \hspace*{1em}\protect{\parbox[b]{\textwidth}{#2 \dotfill}}}
        % Print the chapter
        \chapter*{#2}
    \end{minipage}
    }

\begin{document}
\tableofcontents

\clearpage

\chapterAndAuthor{The name of the first author, The name of second author and The name of the third author}{Test Chapter One is really long, and I wouldn't really bother to read it as I am falling asleep}

\lipsum[1-20]

\chapterAndAuthor{John Doe}{Test Chapter Two}
\lipsum[1-20]

\end{document}