[Tex/LaTex] \titleformat (in titlesec) doesn’t show any horizontal line for chapter

chaptersrulessectioningtitlesec

I have been trying to get a simple thing working with titlesec: getting a horizontal line under each chapter. There are many tutorials, documents and questions on TeX that explain how this can be done. But … each one of those answers have given me absolutely nothing. These are the solutions I have tried:

But in each case, the compiled pdf shows exactly what it was showing without any use of \titleformat. My current preamble uses titlesec as follows:

\documentclass[11pt,oneside]{book}
\usepackage{titlesec}
% Below "\section" can be replaced with "\subsection" and "\subsubsection"
% in order to customize the corresponding headings. "bch" - Bitstream
% Charter, "b" - bold.
\titleformat{\section}[hang]
{\usefont{T1}{bch}{b}{n}\selectfont}
{}    % label
{0em} % horizontal separation between label and title body
{\hspace{-0.4pt}\Large \thesection\hspace{0.6em}} % before-code
[] % after-code

\titleformat
{\chapter}                       % command
[display]                        % shape
{\normalfont\huge\bfseries}      % format
{\chaptertitlename\ \thechapter} % label
{20pt}                           % sep
{\Huge}[\vspace{2ex}\titlerule]  % before-code


This is just one of at least a dozen variations I have tried (including the example at the end of the titlesec documentation, including the {name=\chapter,numberless} method explained in section 3.8, but all I have to show for it is this screenshot:

As you can see, there is no horizontal line anywhere over, under or near the chapter "Abstract". The document is nearly empty right now. After the preamble ends, all I have is

\begin{document}
\maketitle
\chapter*{Abstract}
Lorem Ipsum etc. etc.
\end{document}


I hope I was able to provide an MWE. Please let me know what I am doing wrong here so that even the most basic example is producing no result.

You have defined the format for numbered chapters and using an un-numbered chapter for Abstract. Defining the format for un-numbered chapters too is needed in this case to get a rule.

\documentclass[11pt,oneside]{book}
\usepackage{titlesec}
% Below "\section" can be replaced with "\subsection" and "\subsubsection"
% in order to customize the corresponding headings. "bch" - Bitstream
% Charter, "b" - bold.
\titleformat{\section}[hang]
{\usefont{T1}{bch}{b}{n}\selectfont}
{}    % label
{0em} % horizontal separation between label and title body
{\hspace{-0.4pt}\Large \thesection\hspace{0.6em}} % before-code
[] % after-code

\titleformat
{\chapter}                       % command
[display]                        % shape
{\normalfont\huge\bfseries}      % format
{\chaptertitlename\ \thechapter} % label
{20pt}                           % sep
{\Huge}[\vspace{2ex}\titlerule]  % before-code

\titleformat
{name=\chapter,numberless}                       % command
[display]                        % shape
{\normalfont\huge\bfseries}      % format
{} % label
{0pt}                           % sep
{\Huge}[\vspace{2ex}\titlerule]  % before-code    %% adjust 2ex here as you want.

\begin{document}
%\maketitle
\chapter*{Abstract}
Lorem Ipsum etc. etc.
\end{document}


I have not adjusted the spacing. Please do so using \titlespacing* The default is

\titlespacing*{\chapter} {0pt}{50pt}{40pt}


Please do it also for un-numbered chapters using

\titlespacing*{name=\chapter,numberless} {0pt}{50pt}{40pt}