Wsrtjtyk

I want to use tikzmark in tikzcd.
However, even the following sample returns errors

documentclass{article}

usepackage{amsmath}

usepackage{tikz-cd} 

usetikzlibrary{tikzmark}



begin{document}



begin{tikzcd}

tikzmark{u1}A & B\

C & tikzmark{u2}D

end{tikzcd}



begin{tikzpicture}[remember picture,overlay]

draw[->] (u1) edge (u2);

end{tikzpicture}

end{document}

The error report is

Package tikz Error: Cannot parse this coordinate. tikzmark{u1}A

Package tikz Error: Cannot parse this coordinate. C & tikzmark{u2}D

Package pgf Error: No shape named u1 is known. draw[->] (u1)

Package pgf Error: No shape named u1 is known. draw[->] (u1) edge
(u2)

Package pgf Error: No shape named u2 is known. draw[->] (u1) edge
(u2)

Package pgf Error: No shape named u2 is known. draw[->] (u1) edge
(u2)

Package pgf Error: No shape named u1 is known. draw[->] (u1) edge
(u2)

Label(s) may have changed. Rerun to get cross-references right.

How to fix this kind of errors?

Update:
I have tried this

documentclass{article}

usepackage{amsmath}

usepackage{tikz-cd} 

usetikzlibrary{tikzmark}



begin{document}



begin{tikzcd}[remember picture]

aaaaaasubnode{u1}{A} & B\

C & subnode{u2}{D}ddddddd

end{tikzcd}



begin{tikzpicture}[remember picture,overlay]

draw[->] (u1) edge (u2);

end{tikzpicture}

end{document}

and this

documentclass{article}

usepackage{amsmath}

usepackage{tikz-cd} 

usetikzlibrary{tikzmark}



begin{document}



begin{tikzcd}[remember picture]

aaaaaatikzmarknode{u1}{A} & B\

C & tikzmarknode{u2}{D}ddddddd

end{tikzcd}



begin{tikzpicture}[remember picture,overlay]

draw[->] (u1) edge (u2);

end{tikzpicture}

end{document}

But none of them put the arrow in correct location.

Update:
The tikzmarknode command does work correctly if I use LuaLaTex instead of XeLaTeX.

(Note: I agree with marmot that for this particular case I wouldn't use tikzmark, but I get that it is a simple example and it reveals a bug in tikzmark.)

It would appear that when I modified tikzmark to make it possible to use inside tikzpictures, then I inadvertently broke the ability to use it inside a node (though I'm not sure if that was ever a recommended use!). A node is inside a tikzpicture but should be treated as if it weren't. My current test for whether the tikzmark is inside a tikzpicture doesn't pick up on this. Here's the corrected test:

documentclass{article}

%url{https://tex.stackexchange.com/q/458387/86}

usepackage{amsmath}

usepackage{tikz-cd} 

usetikzlibrary{tikzmark}



makeatletter



deftikzmark{%

  ifxpgfpictureid@undefined

  lettikzmark@next=tikzmark@outside

  else

  relax

  ifxscopetikz@origscoperelax

  lettikzmark@next=tikzmark@outside

  else

  lettikzmark@next=tikzmark@inside

  fi

  fi

  tikzmark@next%

}

makeatother



begin{document}



begin{tikzcd}

tikzmark{u1}A & B\

C & tikzmark{u2}D

end{tikzcd}



begin{tikzpicture}[remember picture,overlay]

draw[->] (pic cs:u1) -- (pic cs:u2);

end{tikzpicture}

end{document}

I've uploaded this to github and will send it off to CTAN once the amazing testing team of marmot has answered a few questions to check that I haven't broken something else!

REVISED ANSWER: I could get tikzmark to collaborate with tikz-cd by switching to tikzmarknode. More precisely, if I rewrite cfr's nice answer to become

documentclass{article}

usepackage{tikz-cd,amssymb}

usetikzlibrary{tikzmark,quotes}

begin{document}

begin{tikzcd}

  x in tikzmarknode{u1}{U} subseteq M arrow{r}{f} & f(x) in V subseteq 

  tikzmarknode{n}{N} arrow{d}{psi} \

  phi(x) in tikzmarknode{u2}{phi(U)} subseteq mathbb{R}^{m} arrow{r}{psi f phi^{-1}} & psi(f(x)) in psi(V) subseteq mathbb{R}^{n}

end{tikzcd}

begin{tikzpicture}[overlay, remember picture]

  draw [->] (u1) edge ["$phi$", right] (u2.north -| u1);

end{tikzpicture}

end{document}

I get

which might be what you are after.

Let me also mention that for your above example you may not use tikzmark since you have the objects already in TikZ nodes.

documentclass{article}

usepackage{amsmath}

usepackage{tikz-cd} 



begin{document}



begin{tikzcd}[remember picture]

A & B\

C & D

end{tikzcd}



begin{tikzpicture}[remember picture,overlay]

draw[->] (tikzcdmatrixname-1-1) edge (tikzcdmatrixname-2-2);

end{tikzpicture}

end{document}