1

I want to add the date when I visited my online references in the very first mentioning of these. I use biblatex with the authoryear-comp style. Here is a MWE:

\documentclass{scrreprt}
\usepackage[style=authoryear-comp]{biblatex}
\addbibresource{\jobname.bib}
\usepackage{filecontents}

\begin{filecontents}{\jobname.bib}
@online{key,
    title = {Very nice online reference},
    url = {https://www.example.com/},
    urldate = {2019-11-25},
    author = {Nobody},
}
\end{filecontents}

% Start of the document.
\begin{document}

% Your content.
I want to cite here with the urldate in the citation.
\parencite{key} should look like:
(Author 2001, visited on 25.11.2019) but just when I first reference it.
In every later cication it shall just look (Author 2001).

% End of the document.
\end{document}

Can anybody help me with that problem?

Remark by user https://tex.stackexchange.com/users/14649: This is a follow question up on How to access urldate in text.

2

You can try something like this. The option citetracker is needed for the \ifciteseen test. The definition of cite is the original definition from authoryear-comp.cbx with the following two lines

  \setunit{\addcomma\space}%
  \usebibmacro{cite:urlinfo}%

added at the end.

The same can be done for textcite, but it should be noted that \textcite has a few special cases (compressed citations, citations without name or year, shorthands) that might give slightly unexpected output with this configuration. I couldn't think of a better general solution, so I recommend to scrutinise the output carefully.

\documentclass{scrreprt}
\usepackage[style=authoryear-comp, citetracker]{biblatex}

\newbibmacro*{cite:urlinfo}{%
  \ifciteseen
    {}
    {\DeclareFieldFormat{urldate}{\bibstring{urlseen}\space##1}%
     \printurldate}}

\makeatletter
\renewbibmacro*{cite}{%
  \iffieldundef{shorthand}
    {\ifthenelse{\ifnameundef{labelname}\OR\iffieldundef{labelyear}}
       {\usebibmacro{cite:label}%
        \setunit{\printdelim{nonameyeardelim}}%
        \usebibmacro{cite:labeldate+extradate}%
        \usebibmacro{cite:reinit}}
       {\iffieldequals{namehash}{\cbx@lasthash}
          {\ifthenelse{\iffieldequals{labelyear}{\cbx@lastyear}\AND
                       \(\value{multicitecount}=0\OR\iffieldundef{postnote}\)}
             {\setunit{\addcomma}%
              \usebibmacro{cite:extradate}}
             {\setunit{\compcitedelim}%
              \usebibmacro{cite:labeldate+extradate}%
              \savefield{labelyear}{\cbx@lastyear}}}
          {\printnames{labelname}%
           \setunit{\printdelim{nameyeardelim}}%
           \usebibmacro{cite:labeldate+extradate}%
           \savefield{namehash}{\cbx@lasthash}%
           \savefield{labelyear}{\cbx@lastyear}}}}
    {\usebibmacro{cite:shorthand}%
     \usebibmacro{cite:reinit}}%
  \setunit{\addcomma\space}%
  \usebibmacro{cite:urlinfo}%
  \setunit{\multicitedelim}}

\renewbibmacro*{textcite}{%
  \iffieldequals{namehash}{\cbx@lasthash}
    {\iffieldundef{shorthand}
       {\ifthenelse{\iffieldequals{labelyear}{\cbx@lastyear}\AND
                    \(\value{multicitecount}=0\OR\iffieldundef{postnote}\)}
          {\setunit{\addcomma}%
           \usebibmacro{cite:extradate}}
          {\setunit{\compcitedelim}%
           \usebibmacro{cite:labeldate+extradate}%
           \savefield{labelyear}{\cbx@lastyear}}}
       {\setunit{\compcitedelim}%
        \usebibmacro{cite:shorthand}%
        \global\undef\cbx@lastyear}}
    {\ifnameundef{labelname}
       {\iffieldundef{shorthand}
          {\usebibmacro{cite:label}%
           \setunit{%
             \global\booltrue{cbx:parens}%
             \printdelim{nonameyeardelim}\bibopenparen}%
           \ifnumequal{\value{citecount}}{1}
             {\usebibmacro{prenote}}
             {}%
           \usebibmacro{cite:labeldate+extradate}}
          {\usebibmacro{cite:shorthand}}}
       {\printnames{labelname}%
        \setunit{%
          \global\booltrue{cbx:parens}%
          \printdelim{nameyeardelim}\bibopenparen}%
        \ifnumequal{\value{citecount}}{1}
          {\usebibmacro{prenote}}
          {}%
        \iffieldundef{shorthand}
          {\iffieldundef{labelyear}
             {\usebibmacro{cite:label}}
             {\usebibmacro{cite:labeldate+extradate}}%
           \savefield{labelyear}{\cbx@lastyear}}
          {\usebibmacro{cite:shorthand}%
           \global\undef\cbx@lastyear}}%
     \stepcounter{textcitecount}%
     \savefield{namehash}{\cbx@lasthash}}%
  \setunit{\addcomma\space}%
  \usebibmacro{cite:urlinfo}%
  \setunit{%
    \ifbool{cbx:parens}
      {\bibcloseparen\global\boolfalse{cbx:parens}}
      {}%
    \textcitedelim}}
\makeatother

\begin{filecontents}{\jobname.bib}
@online{key,
  title   = {Very nice online reference},
  url     = {https://www.example.com/},
  urldate = {2019-11-25},
  author  = {Nobody},
}
\end{filecontents}
\addbibresource{\jobname.bib}

\begin{document}
\parencite{key}

\parencite{key}
\end{document}

(Nobody 2019, visited on 11/25/2019)//(Nobody 2019)

4
  • That's just very very helpful. Can I somehow enhance this, that the date is also added, when using textcite for the first time? – mathse Dec 20 '19 at 21:20
  • I used your ideas and managed to adapt the \textcite command by basically just adding your 2 lines and now everything works like a charm. Thanks for the support! – mathse Dec 20 '19 at 21:49
  • @mathse Consider accepting the provided answer since it solved your problem. – Dr. Manuel Kuehner Dec 21 '19 at 3:38
  • 1
    @mathse I added something for textcite as well, but since the code there is more complex I strongly recommend you check the output carefully, one might have to work around a few oddities. – moewe Dec 21 '19 at 7:07

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