Am 20.02.2014 um 23:09 schrieb Pablo Rodriguez :

On 02/20/2014 09:39 PM, Wolfgang Schuster wrote:

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Am 20.02.2014 um 21:12 schrieb Pablo Rodriguez:

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[...] 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

Have you looked at: http://wiki.contextgarden.net/Headers_and_Footers#Marginal_headings_and_cent... ?