Hi,

For my book, the header for each chapter should be like the attached image. I don't know if I am using the best method, but the result looks like what I want. Nevertheless, I am having a problem.

I don't understand why the first chapter is not numbered while the second is with number 1 etc.

Thanks.

Fabrice

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\definecolor[MyColorA][r=0.8784, g=0.8784, b=0.8784]

\defineframedtext
[FramedText]
[
offset=0.6em,
style=,
toffset=\lineheight,
background=color,
backgroundcolor=MyColorA,
foregroundstyle={\switchtobodyfont[11pt]},
align={left, broad},
frame=off,
width=\textwidth,
]

\setuplabeltext
[en]
[chapter=CHAPITRE]

\setuppagenumbering
[alternative=doublesided,location=]

\unexpanded\def\HeadTitle#1#2%
{
\FramedText{{\cap\labeltext{chapter}}\space#1
\\
\bfc#2}
}

\unexpanded\def\processheadnumber#1%
{\getmarking[chapternumber]}

\setuphead
[chapter]
[style=\bfd,
align={flushleft,broad},
numbercommand=\processheadnumber,
command=\HeadTitle]

\starttext
\startchapter [title={La récurrence}]
\startsection[title={Le principe de récurrence}]
\input knuth
\stopsection
\startsection[title={Le raisonement par récurrence}]
\input knuth
\stopsection
\startsection[title={Récurrences fortes}]
\input knuth
\stopsection
\startsection[title={Exercices corrigés}]
\input knuth
\stopsection
\stopchapter
\startchapter [title=Combinatoire-Dénombrement]
\input knuth
\stopchapter
\startchapter [title=Suites]
\input knuth
\stopchapter
\stoptext

####################################