Hi,

Using this (but it's not exactly what I want) it works<= /span>

te= st-1.tex %%%%%%%%%%%%%%

\setuppagenumbering
=C2=A0 [alternative=3Ddoublesi= ded,location=3D]

\definelayout
=C2=A0 [1]
=C2=A0 [header=3D10m= m]

\setuplayout
=C2=A0 [header=3D0pt,
=C2=A0 =C2=A0height=3Dmi= ddle]

\setupbackgrounds
=C2=A0 =C2=A0[header]
=C2=A0 =C2=A0[te= xt]
=C2=A0 =C2=A0[frame=3Doff,bottomframe=3Don,
=C2=A0 =C2=A0 =C2=A0f= ramecolor=3Dlightgray,rulethickness=3D1pt]

\starttext
\dorecu= rse{5}{\samplefile{lorem}}
%\dorecurse{1}{\samplefile{lorem}}
\stopte= xt

%%%%%%%%%%%%%%%%%%=C3=B9

Using this (almost what I'm= trying to do) without success

test-2.tex %%%%%%%%%%%%%

\setuppagenumbering
=C2=A0 [alternative=3Ddoublesided,location=3D= ]

\setupbackgrounds
=C2=A0 [header]
=C2=A0 [text]
=C2=A0 [f= rame=3Doff,bottomframe=3Don,
=C2=A0 =C2=A0framecolor=3Dlightgray,rulethi= ckness=3D1pt]

\startsetups[header]
=C2=A0 \doifelse{\totalnumbero= fpages}{1}
=C2=A0 =C2=A0 {\setupheadertexts[\setups{header}]}
=C2=A0 = =C2=A0 {}
\stopsetups

\starttext
\dorecurse{5}{\samplefile= {lorem}}
%\dorecurse{1}{\samplefile[lorem]r}
\stoptext<= /span>

<= span class=3D"gmail-JLqJ4b gmail-ChMk0b">%%%%%%%%%%%%%%%%%%%

Fabrice

Le=C2=A0jeu. 26 ao=C3=BBt 2021 =C3=A0=C2=A017:56, Wolfgang = Schuster via ntg-context <ntg-cont= ext@ntg.nl> a =C3=A9crit=C2=A0:

Taco Hoekwater via ntg-context schrieb am 26.08.2021= um 16:34:
>
> Hi,
>
>> On 26 Aug 2021, at 16:07, Fabrice Couvreur via ntg-context <ntg-context@ntg.nl= > wrote:
>>
>> Hi,
>> I know I asked the question a few years ago, but I don't remem= ber !
>> The idea is to test whether the document contains only one page or= not.
>
> Perhaps not the nicest solution, but this works:
>
> \doifvalueelse
>=C2=A0 =C2=A0 {\lastpage}
>=C2=A0 =C2=A0 {1}
>=C2=A0 =C2=A0 {\message{true}}
>=C2=A0 =C2=A0 {\message{false}}

Same solution but better counter name:

\doifelse{\totalnumberofpages}{1}{...}{...}

Wolfgang
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