How to personalize \citeauthor command

Question

I'm writing thesis using tuned report class, biblatex and biber for bibliography. bib file entries are generated by ScienceDirect export citation feature and style is czech-iso.

For referring to some figure, graph or table I'd like to get this layout:

Image

Caption

From: 1st Author et.al.: Title [#].

and in bibliography

[#] 1st AUTHOR, 2nd AUTHOR, 3rd AUTHOR, Title,...

For that purpose I use

\documentclass[a4paper,11pt%,draft%
 ]{report}
\usepackage[french,english,czech]{babel}
\usepackage[utf8]{inputenc}
\usepackage{url}
\usepackage{float}
\usepackage{lipsum}
\usepackage[
backend=biber,
babel=other,
sortlocale=cs_CZ,
style=iso-numeric,
autocite=superscript
]{biblatex}

\newcommand\foo[1]{\footnotesize{From: \Citeauthor{#1}: \citetitle{#1} \cite{#1}}}
\addbibresource{citace.bib}

\begin{document}
\lipsum[1]
\begin{figure}[H]
image
\caption{Text}
\foo{Yoshizawa:1993}
\end{figure}
\lipsum[2]
\printbibliography

\end{document}

but it returns:

1st AUTHOR, 2nd AUTHOR,... : "Title" [#]

How can I shorten the \citeauthor output without any effect to otput of \printbibliography?

Answer 1

You may set option maxcitenames to only influence the cites but not the bibliography, e.g.,

\RequirePackage{filecontents}
\begin{filecontents*}{\jobname.bib}
@book{ Author:2001,
  author = {1st AUTHOR and 2nd AUTHOR and 3rd AUTHOR},
  title = {Title}
}
\end{filecontents*}

\documentclass{article}
\usepackage[demo]{graphicx}% option demo for demostration only!
\usepackage[maxcitenames=1]{biblatex}
\bibliography{\jobname}

\newcommand\foo[1]{\vspace{3ex}% \\[3ex] replaced to avoid "there's no
                            % line to end here" errors
  \footnotesize{From: \citeauthor{#1}: \citetitle{#1} \cite{#1}}}

\begin{document}
\begin{figure}
 \includegraphics{fig1}
 \caption{Some text}
 \foo{Author:2001}
\end{figure}

\printbibliography
\end{document}