Beamer citation footnote: Adding note to citation

Question

This is a follow-up question (see this question too for another follow-up question).

From the accepted answer, when I try to add note [not sure what the proper terminology is] to the citation (as in \cite[page 0]{mybibitem}), I observe that the note appears twice (see minimal working example below):

\documentclass{beamer}
\usepackage[style=numeric,citecounter=true,citetracker=true]{biblatex} 
\usepackage{filecontents}
\begin{filecontents*}{myreferences.bib}
    @online{bad,
        author = {{Bad Man}},
        year = {1313},
        title = {Bad Title},
        url = {http://badurl.com/},
    }
\end{filecontents*}
\addbibresource{myreferences.bib}

%https://tex.stackexchange.com/a/165016/38244
\hypersetup{
    colorlinks,
    citecolor=red,
    linkcolor=blue,
%   backref=true
}



\usepackage{algorithm}
\PassOptionsToPackage{noend}{algpseudocode}% comment out if want end's to show
\usepackage{algpseudocode}% http://ctan.org/pkg/algorithmicx
\usepackage{algorithmicx}


\let\svthefootnote\thefootnote

\makeatletter
% https://tex.stackexchange.com/a/29931/38244
\DeclareCiteCommand{\cite}
{\usebibmacro{prenote}}%
{%  
    \ifciteseen{}{%
        \usebibmacro{citeindex}%
        \let\thefootnote\relax%
        \footnotetext{%
            \blx@anchor
            \mkbibbrackets{\usebibmacro{cite}}%
            \setunit{\addnbspace}
            \printnames{labelname}%
            \setunit{\labelnamepunct}
            \printfield[citetitle]{title}%
            \newunit%
            \printfield[]{year}%
        }%
        \let\thefootnote\svthefootnote%
    }%
    \autocite{\thefield{entrykey}}%
  }
{\addsemicolon\space}
{\usebibmacro{postnote}}
\makeatother



\begin{document}


\begin{frame}{What I found}
    First time, \cite[page 99]{bad}   
\end{frame}

\begin{frame}{Again}
    Next time, \cite[page 1]{bad} only
\end{frame}



\end{document}

Here are the screen-shots (see the duplication of the notes):

How can I get rid of the duplication?

Andrew Swann · Accepted Answer · 2019-06-08T16:06:28.360

You should remove the prenote and postnote parts, and perhaps the associated punctation, in your definition of \cite as the \autocite call will take care of these:

\documentclass{beamer}
\usepackage[style=numeric,citecounter=true,citetracker=true]{biblatex}
\usepackage{filecontents}
\begin{filecontents*}{myreferences.bib}
    @online{bad,
        author = {{Bad Man}},
        year = {1313},
        title = {Bad Title},
        url = {http://badurl.com/},
    }
\end{filecontents*}
\addbibresource{myreferences.bib}

%https://tex.stackexchange.com/a/165016/38244
\hypersetup{
    colorlinks,
    citecolor=red,
    linkcolor=blue,
%   backref=true
}



\usepackage{algorithm}
\PassOptionsToPackage{noend}{algpseudocode}% comment out if want end's to show
\usepackage{algpseudocode}% http://ctan.org/pkg/algorithmicx
\usepackage{algorithmicx}


\let\svthefootnote\thefootnote

\makeatletter
% https://tex.stackexchange.com/a/29931/38244
\DeclareCiteCommand{\cite}
{}%
{%
    \ifciteseen{}{%
        \usebibmacro{citeindex}%
        \let\thefootnote\relax%
        \footnotetext{%
            \blx@anchor
            \mkbibbrackets{\usebibmacro{cite}}%
            \setunit{\addnbspace}
            \printnames{labelname}%
            \setunit{\labelnamepunct}
            \printfield[citetitle]{title}%
            \newunit%
            \printfield[]{year}%
        }%
        \let\thefootnote\svthefootnote%
    }%
    \autocite{\thefield{entrykey}}%
  }
{}
{}
\makeatother



\begin{document}


\begin{frame}{What I found}
    First time, \cite[page 99]{bad}
\end{frame}

\begin{frame}{Again}
    Next time, \cite[page 1]{bad} only
\end{frame}

\end{document}

I have also removed the \addsemicolon\space, but you might want to retain this, it is the punctuation between multiple citations in the same call of \cite: \cite{one,two}.

In your comments you asked for removing the year from the output in the footnote. All you need to is remove the corresponding lines from the new cite command:

\makeatletter
\DeclareCiteCommand{\cite}
{}%
{%
    \ifciteseen{}{%
        \usebibmacro{citeindex}%
        \let\thefootnote\relax%
        \footnotetext{%
            \blx@anchor
            \mkbibbrackets{\usebibmacro{cite}}%
            \setunit{\addnbspace}
            \printnames{labelname}%
            \setunit{\labelnamepunct}
            \printfield[citetitle]{title}%
        }%
        \let\thefootnote\svthefootnote%
    }%
    \autocite{\thefield{entrykey}}%
  }
{}
{}
\makeatother

Probably a stupid question, but how can I remove the year field from the bibliography? — hola, Jun 07 '19 at 03:16
You can either delete the year line from the entry in the bib file, or you can dynamically delete this for all @online entries via \DeclareSourcemap{\maps[datatype=bibtex]{\map{\pertype{online}\step[fieldset=year,null]}}} — Andrew Swann, Jun 07 '19 at 06:54
The second approach seems tangential to my head :-). Can we do something like deleting \newunit% and \printfield[]{year}%? — hola, Jun 07 '19 at 22:58
Yes, if you just want to remove it from that output of the citation command; but this won't affect the bibliography that you asked about. — Andrew Swann, Jun 08 '19 at 08:26
OK, I mistyped the question... I wanted to remove the year from output of the citation command (so that year is not printed where the information on the cited entry is printed). — hola, Jun 08 '19 at 16:02

score 0 · Answer 2 · answered Jun 04 '19 at 22:16

Here's an answer from the user samcarter (who is apparently suspended from this site):

\documentclass{beamer}
\usepackage[style=numeric,citecounter=true,citetracker=true]{biblatex} 
\usepackage{filecontents}
\begin{filecontents*}{myreferences.bib}
    @online{bad,
        author = {{Bad Man}},
        year = {1313},
        title = {Bad Title},
        url = {http://badurl.com/},
    }
\end{filecontents*}
\addbibresource{myreferences.bib}

%https://tex.stackexchange.com/a/165016/38244
\hypersetup{
    colorlinks,
    citecolor=red,
    linkcolor=blue,
%   backref=true
}



\usepackage{algorithm}
\PassOptionsToPackage{noend}{algpseudocode}% comment out if want end's to show
\usepackage{algpseudocode}% http://ctan.org/pkg/algorithmicx
\usepackage{algorithmicx}


\let\svthefootnote\thefootnote

\makeatletter
% https://tex.stackexchange.com/a/29931/38244
\DeclareCiteCommand{\cite}
{\usebibmacro{prenote}}%
{%  
    \ifciteseen{}{%
        \usebibmacro{citeindex}%
        \let\thefootnote\relax%
        \footnotetext{%
            \blx@anchor
            \mkbibbrackets{\usebibmacro{cite}}%
            \setunit{\addnbspace}
            \printnames{labelname}%
            \setunit{\labelnamepunct}
            \printfield[citetitle]{title}%
            \newunit%
            \printfield[]{year}%
        }%
        \let\thefootnote\svthefootnote%
    }%
    \autocite{\thefield{entrykey}}%
  }
{}
{}
\makeatother



\begin{document}


\begin{frame}{What I found}
    First time, \cite[page 99]{bad}   
\end{frame}

\begin{frame}{Again}
    Next time, \cite[page 1]{bad} only
\end{frame}

\end{document}

Beamer citation footnote: Adding *note* to citation

2 Answers2

Beamer citation footnote: Adding note to citation