Including "Chapter" before each section number in the ToC? (Article Class)

Question

Basically, here's my MWE, and I need to include "Chapter" before every section title in the ToC (without changing anything else).

   \documentclass[12pt]{article}
\usepackage[utf8]{inputenc} 
\usepackage[english]{babel}
\usepackage[titles]{tocloft}
\usepackage{titlesec}
\usepackage{titletoc}

\addto\captionsenglish{ \renewcommand*\contentsname{\centerline{TABLE OF CONTENTS}}}

%\renewcommand{\thesection}{CHAPTER}
%\renewcommand{\cftsecpresnum}{Chapter \thesection}
\titleformat{\section}[display]%
{\null\vskip1em\sffamily\bfseries\filcenter}{Chapter \thesection}{0em}{}[]
\titlespacing*{\section}{0em}{1em}{1em}

\titlecontents{section}
[1.5em] % ie, 1.5em (chapter) + 2.3em
{}
{\contentslabel{1em}}
{\hspace*{-1.5em}}
{\titlerule*[0.5pc]{.}\contentspage}

\begin{document}
\newpage
\tableofcontents
\newpage

\section{Section One}
\section{Section Two}
Content
\end{document}

The commented out code is what I've already tried. The first one just changes the number to "CHAPTER" and doesn't move the text in the ToC (so it just overlays on top of the name of the section), and if I include "\thesection" after "CHAPTER" it creates an infinite loop definition error. The second one causes no differences, and the code still compiles.

Thanks!

Answer 1

Here is a solution. I didn't load tocloft, since I use titletoc. Also I added a formatting for thoe unnumbered sections which should appear in the table of contents:

 \documentclass[12pt]{article}
\usepackage[utf8]{inputenc}
\usepackage[english]{babel}
\usepackage[showframe]{geometry}
\usepackage{titlesec}
\usepackage{titletoc}

\addto\captionsenglish{ \renewcommand*\contentsname{\centerline{TABLE OF CONTENTS}}}

\titleformat{\section}[display]%
{\null\vskip1em\sffamily\bfseries\filcenter}{Chapter \thesection}{0em}{}[]
\titleformat{name = \section, numberless}[block]%
{\null\vskip1em\sffamily\bfseries\filcenter}{}{0em}{}
\titlespacing*{\section}{0em}{1em}{1em}

\titlecontents{section}
[7em] % ie, width of contentslabel + 0.5em
{\medskip}
{\contentslabel[\MakeUppercase\chaptername~\thecontentslabel]{6.5em}}%\thecontentslabel
{\hspace*{-6.5em}}
{\titlerule*[0.5pc]{.}\contentspage}

\begin{document}

\tableofcontents
\newpage

\section*{An Unnumbered Section}
\addcontentsline{toc}{section}{An Unnumbered Section}
\section{Section One}
\subsection{A first subsection}
\section{Section Two}
Content

\end{document} 

Answer 2

I am editing a book using tstextbook, which includes use of package titletoc.

Solutions given in this thread did not helped me. Because of package titlesec introduce too many error in my compilation, resulting in a bigger problems that that I was trying to solve. The same case when I tried to test solutions that use package tocloft.

After some hours researching and testing, my solution is simple: just by modifying the of the \titlecontents command for "chapter".

My original entry:

{\color{tssteelblue}\contentslabel[\Large\thecontentslabel]{1.25cm}} %ORIGINAL

A working solution:

{\chaptername\ \thecontentslabel:\quad}% <numbered-entry-format> %It compiled within my code without errors!!!

My final solution, that solved my requirement:

{\color{tssteelblue}\Large\chaptername\ \thecontentslabel.\space} %Final solution

*Please consider that my book is in Spanish.

My final complete code for chapter:

%\titlecontents{ <section> }[ <left> ]
%{ <above-code> }
%{ <numbered-entry-format> }{ <numberless-entry-format> }
%{ <filler-page-format> }[ <below-code> ]

\titlecontents{chapter}[0cm]
{\addvspace{14pt}\large\sffamily\bfseries}
{\color{tssteelblue}\Large\chaptername\ \thecontentslabel.\space} %Final solution
{}
{\color{tssteelblue}\normalsize\sffamily\bfseries\;\titlerule*[.5pc]{.}\;\thecontentspage}

My solution given from here