Am 20.02.2014 um 23:09 schrieb Pablo Rodriguez <oi...@gmx.es>:

> On 02/20/2014 09:39 PM, Wolfgang Schuster wrote:
>> Am 20.02.2014 um 21:12 schrieb Pablo Rodriguez:
>>> [...]
>>> How can I make the first conditional work?
>> 
>> You can’t, markings are only reliable when you use them in the
>> header of footer of the page.
>> 
>> To access the values of a heading you can use the \structurevariable
>> and \namedstructurevariable commands.
> 
> Many thanks for your reply, Wolfgang.
> 
> My question was about headers, but I didn’t mention it to make a shorter 
> sample.

In this case this was a important part for the solution because it makes a 
difference
when you use \getmarking in \setupheadertexts or in the text.

> The code now is the following:
> 
> \setupheadertexts[\hfill\namedstructurevariable{chapter}{title}\hfill]
>    [] []
>    [\hfill\doifsomethingelse{\namedstructurevariable{section}{title}}
>            {\namedstructurevariable{section}{title}}
>            {\namedstructurevariable{chapter}{title}}\hfill]
> 
> 
> Only a minor detail: is there a more proper way to center both headings?


You can use the simple version of \setupheadertexts and use \doifoddpageelse
to check whether you’re on a left or right page. When you make a test for 
content
of a \getmarking command you have to use \doiftext because the \doifempty etc.
checks don’t work in this case.

\startsetups[header]
  \doifoddpageelse
    {
      \getmarking[chapter]
    }
    {
      \doiftextelse
        {
          \getmarking[section]
        }
        {
          \getmarking[section]
        }
        {
          \getmarking[chapter]
        }
    }
\stopsetups


\setupheadertexts[\directsetup{header}]
\setupfootertexts[pagenumber]

\starttext

\chapter{Chapter A}

\page

\chapter{Chapter B}

\page

\dorecurse{5}
  {\chapter{Chapter #1}
   \dorecurse{10}
     {\section{Section #1.##1}
          \dorecurse{3}{\input knuth\par}}}

\stoptext

Wolfgang
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