# Re: [NTG-context] [NTG-Context] How to compute correct page number for handout

Dear Peter,

I run into some problem with font handling in MKIV so I'm stuck in MKII for
some time.

I've tried the following :
\starttext
\def\ChapterPrefix#1{%
\the\numexpr\number#1/4\relax
}
\setupcombinedlist[content][level=1]
\setuplist[chapter][after=,before=,numbercolor=yellow,numbercommand=\underbar,pagecommand=\ChapterPrefix]
\setuplist[section][]
\completecontent
\dorecurse{3}{\chapter{test} \dorecurse{4}{test \page}}
\stoptext

In MKII, I get a "Missing number error".
I've isolated the problem : the value given to the \chapterprefix by the
pagecommand option seems to be a text value and not a numeral value.

I've tried to find a function to translate text to number but I've not find it.

I hope to get some help.

kind regards,
Pierre-François.

Le 30 sept. 2010 à 14:12, Peter Münster a écrit :

> On Thu, Sep 30 2010, Pierre-François Bonnefoi wrote:
>>
>> I've tried it and I'm sorry to report that this only works in MK IV, that I
>> don't use (I've tried but some of my documents don't translate correctly).
>
> Hello,
>
> Your \ChapterPrefix works out of the box with mkiv. Eventually it's easier to
> solve the problems you have with mkiv, than dividing the page number by 4 in
> mkii?  I don't know...
>
> Cheers, Peter
>
> --
> Contact information: http://pmrb.free.fr/contact/
>
>
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