Am 06.03.2025 um 19:37 schrieb Pablo Rodriguez via ntg-context:
On 3/6/25 17:55, Wolfgang Schuster wrote:
1. Add a optional argument to \sidebarA.
\ifparameter#1\or\pagereference[#1]\fi
Many thanks for your reply, Wolfgang.
I didn’t know \ifparameter existed.
I have a question, would this possible?
\ifparameter#1\pagereference[#1]\else\fi
If it were, which would be the difference?
With \ifparameter you can check if the given parameter has content or not and everything goes after the \or, not before it. The check itself is similar to \doifelsesomething or \ifempty because you only care whether the argument is empty or not. %%%% begin example \tolerant\def\Test[#1][#2]% {\ifparameter#1\or Optional argument! \else Empty or no argument! \fi} \starttext \Test \Test[xxx] \Test[] \stoptext %%%% end example More information can be found in lowlevel-macros.pdf. Wolfgang