On 2015-10-15 Wolfgang Schuster wrote:
>
> Create a command and apply it to the numbercommand key.
> 
> \define[1]\ChapterListNumbercommand
>     {\simplealignedbox{\listparameter{width}}{flushright}{#1}}
> 
> \setuplist
>     [chapter]
>     [
>         before=,
>         distance=0.5cm,
>         width=-0.5cm,
>         margin=2cm,
>         numbercommand=\ChapterListNumbercommand,
>         pageconversionset=pagenumber,
>     ]
> 

This compiles, thanks, but that number is not hanging on the right any more :-(

This is my more complete MWE:

\setuphead[chapter][
   alternative=middle,
   before={\blank[force,10mm]},
   after={\blank[1*line]},
   style=\bfc,
   numberstyle={\kerncharacters[0.125]\bfa},
   numbercommand=\groupedcommand{}{\blank[4mm]},
   sectionstopper={.},
   conversion=Romannumerals,
]
 
\define[1]\ChapterListNumbercommand
    {\simplealignedbox{\listparameter{width}}{flushright}{#1}}

\setupcombinedlist[chapter][
   before=,
   distance=0.5cm,
   width=-0.5cm,
   margin=2cm,
   numbercommand=\ChapterListNumbercommand,
   pageconversionset=pagenumber,
]

\starttext
\startfrontmatter
\title{TOC}
\placecontent
\chapter{Preface}
\stopfrontmatter
\startbodymatter
\chapter{Chapter 1}
\stopbodymatter
\stoptext

Desired output is attached.

Jan