How do I test for even/odd page within TikZ foreach loop

Question

I'm creating a document using the TikZ foreach loop.  Here's a snippet
documentclass{article}
usepackage{tikz}
begin{document}

foreach myi in {1,2,...,17}
  {
    hello(myi)
    clearpage
    ifoddpage
      A
    else
      B
    fi
  }

end{document}

But this creates the following error:
! Extra }, or forgotten endgroup.
pgffor@collectargument ...fter {pgffor@body {#1}
                                                  }else expandafter long ...
l.14   }

Any ideas of how to work around this?

Werner · Accepted Answer

ifoddpage is not defined by default. You need to add that package to your preamble and also checkoddpage before calling checking ifoddpage:
documentclass{article}

usepackage{tikz,ifoddpage}

begin{document}

foreach myi in {1,2,...,17}{%
  clearpage
  checkoddpage
  ifoddpage
    A
  else
    B
  fi
  hello(myi)
}

end{document}

Here's the same approach using refcount:
documentclass{article}

usepackage{tikz,refcount}

newcounter{oddpagelabel}
newcommand{checkoddpage}{stepcounter{oddpagelabel}label{opl-theoddpagelabel}}

begin{document}

foreach myi in {1,2,...,17}{%
  clearpage
  checkoddpage
  ifoddgetpagerefnumber{opl-theoddpagelabel}
    A
  else
    B
  fi
  hello(myi)
}

end{document}

How do I test for even/odd page within TikZ foreach loop

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