多次引用同一作者且没有日期 - 如何删除“a”周围的括号，例如 (Johansson nd [a])？

Question

好吧，要实现你想要的，还有一些事情要做。@samcarter 提到的代码行似乎试图覆盖的底层机制labeldate。我在这里假设你只想对online条目这样做，而不是让urldate取代labeldate。这是通过注释提到的代码行并重新定义字段来完成的，labeldate其中考虑了：

\DeclareLabeldate{%
  \field{date}
  \field{year}
  \field{eventdate}
  \field{origdate}
  % \field{urldate}
  \literal{nodate}
}

您还希望为“nd”添加本地化字符串。这通常应该可以立即使用。但该特定字符串swedish.lbx有%FIXME。（您可能希望在https://github.com/plk/biblatex/issues。biblatex 的本地化字符串的维护依赖于母语人士来提供它们）。无论如何，目前，您必须将字符串添加到您的\DefineBibliographyString：

nodate = {u\adddot å\adddot},

最后，要删除 extradate 的括号，可以使用：

\DeclareFieldFormat{extradate}{%
  \iffieldnums{labelyear}
    {\mknumalph{#1}}
    {\addnbthinspace\mknumalph{#1}}}

我还将您已弃用的版本更改\DeclareSortingScheme为当前的版本\DeclareSortingTemplate。

将所有内容放在一起（通过@moewe 对您的 biblatex 定制进行彻底更新）：

\documentclass[a4paper, 12pt]{article}
\usepackage[swedish]{babel}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{csquotes}

% Biblatex
\usepackage[
    backend=biber,
    style=authoryear-icomp,
    sorting=nyc,
    isbn=false, 
    doi=true, 
    dashed=false, 
    maxbibnames=99,
    uniquename=init,
    giveninits 
  ]{biblatex}

\addbibresource{test.bib}

%--changes to get citations and bibliography the way my university wants---- 
\DeclareFieldFormat[article]{title}{#1}
\renewbibmacro{in:}{}

% \renewcommand*{\finalnamedelim}{%
%   \ifnumgreater{\value{liststop}}{2}{\finalandcomma}{}%
%   \addspace\&\space}
\DeclareDelimFormat{finalnamedelim}{%
  \ifnumgreater{\value{liststop}}{2}{\finalandcomma}{}%
  \addspace\&\space}


%u.å is swedish for n.d. (no date) % better to do this with the
%localized "nodate" string
% \newcommand{\mkbibnodate}{u\adddot å\adddot}
% \AtEveryCitekey{\iffieldundef{year}{\restorefield{labelyear}{\mkbibnodate}}{}}
% \AtEveryBibitem{\iffieldundef{year}{\restorefield{labelyear}{\mkbibnodate}}{}}

% do not consider "urldate" as a candidate for labeldate
\DeclareLabeldate{%
  \field{date}
  \field{year}
  \field{eventdate}
  \field{origdate}
  % \field{urldate}
  \literal{nodate}
}

% This is the original definition
% \DeclareFieldFormat{extradate}{%
%   \iffieldnums{labelyear}
%     {\mknumalph{#1}}
%     {\mkbibparens{\mknumalph{#1}}}}
% If you don't want brackets in any case:
\DeclareFieldFormat{extradate}{%
  \iffieldnums{labelyear}
    {\mknumalph{#1}}
    {\addnbthinspace\mknumalph{#1}}}

\DeclareFieldFormat{urldate}{\mkbibbrackets{#1}}
% \NewBibliographyString{available}

%tillgänglig is swedish for available
\DefineBibliographyStrings{swedish}{%
  % available = {Tillgänglig},
  urlfrom     = {Tillgänglig},
  andothers   = {et\addabbrvspace al\adddot},
  nodate      = {u\adddot å\adddot}, % added: that currently stands with a % FIXME in swedish.lbx
  pages       = {ss\adddot},
}

\DeclareFieldFormat{url}{\bibstring{urlfrom}\addcolon\space\url{#1}}

%", Vol. x (x),"
% \DeclareFieldFormat[article]{volume}{vol. #1}
\DeclareFieldFormat[article]{volume}{\bibstring{volume}~#1}

\renewbibmacro*{volume+number+eid}{%
  \setunit{\addcomma\space}%
  \printfield{volume}%
  \setunit*{\addnbspace}% 
  \printfield{number}%
  \setunit{\addcomma\space}%
  \printfield{eid}}
\DeclareFieldFormat[article]{number}{\mkbibparens{#1}}

%"ss. XX-XX."
% \DeclareFieldFormat[article]{pages}{ss. #1 \adddot}
\DeclareFieldFormat{pages}{\mkpageprefix[bookpagination]{#1}}

% \DeclareNameAlias{sortname}{last-first}
\DeclareNameAlias{sortname}{family-given}

\DeclareSortingTemplate{nyc}{
  \sort{
    \field{presort}
  }
  \sort[final]{
    \field{sortkey}
  }
  \sort{
    \field{sortname}
    \field{author}
    \field{editor}
    \field{translator}
    \field{sorttitle}
    \field{title}
  }
  \sort{
    \field{sortyear}
    \field{year}
  }
  \sort{\citeorder}
}
%----------------end of changes------------------
\begin{document}
Word word word word \parencite{johansson_sun_????}.

Word word word word \parencite{johansson_earth_????}.

\printbibliography
\end{document}

编辑：moewe 在以下网址提供了 Overleaf 当前 biblatex 版本 (3.4) 的工作设置https://www.overleaf.com/read/ydgxhpnsfyxs

我把代码也留在这里：

\documentclass[a4paper, 12pt]{article}
\usepackage[swedish]{babel}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{csquotes}

% Biblatex
\usepackage[
    backend=biber,
    style=authoryear-icomp,
    sorting=nyc,
    isbn=false, 
    doi=true, 
    dashed=false, 
    maxbibnames=99,
    uniquename=init,
    giveninits 
  ]{biblatex}

\usepackage{filecontents}
\begin{filecontents}{\jobname.bib}
@online{johansson_sun_????,
    title = {Sun},
    author = {Johansson, Sven},
    urldate = {2018-04-12},
}

@online{johansson_earth_????,
    title = {Earth},
    author = {Johansson, Sven},
    urldate = {2018-04-12},
}
\end{filecontents}
\addbibresource{\jobname.bib}

%--changes to get citations and bibliography the way my university wants---- 
\DeclareFieldFormat[article]{title}{#1}
\renewbibmacro{in:}{}

\renewcommand*{\finalnamedelim}{%
  \ifnumgreater{\value{liststop}}{2}{\finalandcomma}{}%
  \addspace\&\space}

\DeclareLabeldate{%
  \field{date}
  \field{year}
  \field{eventdate}
  \field{origdate}
  % \field{urldate}
  \literal{nodate}
}

%u.å is swedish for n.d. (no date)
\DeclareFieldFormat{extrayear}{%
  \iffieldnums{labelyear}
    {\mknumalph{#1}}
    {\addnbthinspace\mknumalph{#1}}}

\DeclareFieldFormat{urldate}{\mkbibbrackets{#1}}
% \NewBibliographyString{available}

%tillgänglig is swedish for available
\DefineBibliographyStrings{swedish}{%
  urlfrom   = {Tillgänglig},
  andothers = {et\addabbrvspace al\adddot},
  nodate    = {u\adddot å\adddot}, % added: that currently stands with a % FIXME in swedish.lbx
  pages     = {ss\adddot},
}

\DeclareFieldFormat{url}{\bibstring{urlfrom}\addcolon\space\url{#1}}

%", Vol. x (x),"
% \DeclareFieldFormat[article]{volume}{vol. #1}
\DeclareFieldFormat[article]{volume}{\bibstring{volume}~#1}

\renewbibmacro*{volume+number+eid}{%
  \setunit{\addcomma\space}%
  \printfield{volume}%
  \setunit*{\addnbspace}% 
  \printfield{number}%
  \setunit{\addcomma\space}%
  \printfield{eid}}
\DeclareFieldFormat[article]{number}{\mkbibparens{#1}}

%"ss. XX-XX."
% \DeclareFieldFormat[article]{pages}{ss. #1 \adddot}
\DeclareFieldFormat{pages}{\mkpageprefix[bookpagination]{#1}}

% \DeclareNameAlias{sortname}{last-first}
\DeclareNameAlias{sortname}{family-given}
\DeclareSortingScheme{nyc}{
  \sort{
    \field{presort}
  }
  \sort[final]{
    \field{sortkey}
  }
  \sort{
    \field{sortname}
    \field{author}
    \field{editor}
    \field{translator}
    \field{sorttitle}
    \field{title}
  }
  \sort{
    \field{sortyear}
    \field{year}
  }
  \sort{\citeorder}
}
%----------------end of changes------------------
\begin{document}
Word word word word \parencite{johansson_sun_????}. \\
Word word word word \parencite{johansson_earth_????}.\\

\printbibliography
\end{document}

Answer 1