Numbers in bibliography cannot be switched on

Question

Using beamer, XeLaTeX and biber, I have single citations in footnotes and a full bibliography on the last slide.

I would like to have numbered entries in the full bibliography but using

\setbeamertemplate{bibliography item}{\insertbiblabel}

did not work. There is simply no number in front of the entries in the bibliography.

Here is the MWE:

\documentclass[10pt]{beamer}

\begin{filecontents*}{test_bib.bib} 
    @book{Peter1, 
        author={Peter Muller}, 
        title={My life as Peter Mueller}, 
        address={Peterstown}, 
        publisher={Petersen family},
        year={2017}
    } 
    @article{Klaus1,
        author = {Peter, Klaus and Petersen, Peter},
        title = {A research article about Peter Mueller},
        journal = {Intern. Journal on Science},
        year = {2018},
        volume = {33},
        pages = {000007},
        doi = {10.10}
}
\end{filecontents*}

\usepackage[style=authortitle,
            autocite=footnote,
            backend=biber,
           ]{biblatex}
\addbibresource{test_bib.bib}

% I thought this would switch on numbers in bibliography
\setbeamertemplate{bibliography item}{\insertbiblabel}

% change appearance of citations in footnotes
\renewbibmacro*{cite:title}{%
  \ifentrytype{article}{
    \printtext[bibhyperref]{%
      \printfield{journaltitle}%
      \setunit{\space}%
      \printtext[parens]{\printdate}%
    }
  }{}%
  \ifentrytype{book}{
    \printtext[bibhyperref]{%
      \printfield[citetitle]{labeltitle}%
      \setunit{\space}%
      \printtext[parens]{\printdate}%
    }%
  }{}
}

\begin{document}

\begin{frame}[t]{Two columns on this page}
    \begin{columns}[T]
        \begin{column}{0.4\textwidth}
          \begin{itemize}
              \item Some text in the first column
              \item More text\footnotemark
            \end{itemize}
        \end{column}
        \footcitetext{Peter1}
        \begin{column}{0.5\textwidth}
            \begin{itemize}
                \item Guess what: more text\footnotemark
              \end{itemize}
        \end{column}
    \end{columns}
    \footcitetext{Klaus1}
\end{frame}

\begin{frame}{Bibliography}
    \printbibliography
\end{frame}

\end{document}

I compile with xelatex, biber, xelatex, xelatex and the compiled bibliography looks as follows:

My question: how do I get numbers in the bibliography (and what is the error in my case) ?

Answer 1

You have to change the style of your bibliography. Change

style=authortitle

to

style=numeric

In your case with your using of citing with footnotes you should use:

 citestyle=authortitle, % <============================================
 bibstyle=numeric,

With the following complete code

\documentclass[10pt]{beamer}

\begin{filecontents*}{test_bib.bib} 
    @book{Peter1, 
        author={Peter Muller}, 
        title={My life as Peter Mueller}, 
        address={Peterstown}, 
        publisher={Petersen family},
        year={2017}
    } 
    @article{Klaus1,
        author = {Peter, Klaus and Petersen, Peter},
        title = {A research article about Peter Mueller},
        journal = {Intern. Journal on Science},
        year = {2018},
        volume = {33},
        pages = {000007},
        doi = {10.10}
}
\end{filecontents*}

\usepackage[%style=numeric, % authortitle <=============================
  citestyle=authortitle, % <============================================
  bibstyle=numeric, % <=================================================
  autocite=footnote,
  backend=biber,
]{biblatex}
\addbibresource{test_bib.bib}

% I thought this would switch on numbers in bibliography
\setbeamertemplate{bibliography item}{\insertbiblabel}

% change appearance of citations in footnotes
\renewbibmacro*{cite:title}{%
  \ifentrytype{article}{
    \printtext[bibhyperref]{%
      \printfield{journaltitle}%
      \setunit{\space}%
      \printtext[parens]{\printdate}%
    }
  }{}%
  \ifentrytype{book}{
    \printtext[bibhyperref]{%
      \printfield[citetitle]{labeltitle}%
      \setunit{\space}%
      \printtext[parens]{\printdate}%
    }%
  }{}
}

\begin{document}

\begin{frame}[t]{Two columns on this page}
    \begin{columns}[T]
        \begin{column}{0.4\textwidth}
          \begin{itemize}
              \item Some text in the first column
              \item More text\footnotemark
            \end{itemize}
        \end{column}
        \footcitetext{Peter1}
        \begin{column}{0.5\textwidth}
            \begin{itemize}
                \item Guess what: more text\footnotemark
              \end{itemize}
        \end{column}
    \end{columns}
    \footcitetext{Klaus1}
\end{frame}

\begin{frame}{Bibliography}
    \printbibliography
\end{frame}

\end{document}

you get the result: