[Tex/LaTex] Why is the \url{} command not recognised here

biberhyperrefurlurls

The \url command in the bibliography file seems not to be recognised as a command to execute. At least, the source is not linked with the corresponding internet site and the command's characters were written (after some escaping).

The template was proposed (in this way or in a similar one) by the wikimedia citation tool.
It didn't matter wether loading hyperref additionally or not. I've compiled the document successfully through calling XeLaTeX — biber — XeLaTeX.

Important piece of the result: exportiert]. 2017. url: %5Curl%7Bhttps:

main.tex:

\documentclass[draft, german, hyperref = {hidelinks}, graphicx = {xelatex}]{beamer} % use larger type; default would be 10pt

% Reihenfolge: url -- hyperref -- biblatex  ???

\usepackage{url}  % Erleichtert das Setzen von URLs
%\usepackage[hidelinks]{hyperref}  % (Unscheinbar) verlinktes Inhaltsverzeichnis - sehr nützlich!
\usepackage{biblatex}  % für die ISBN-Nummer
\addbibresource{quellen.bib}

\begin{document}
\begin{frame}
\frametitle{Quellen}
\nocite{*}
\printbibliography
\end{frame}
\end{document}

quellen.bib:

@misc{wiki:cclasses,
   author = "Wikimedia Commons",
   title = "File:Complexity classes (de).svg --- Wikimedia Commons{,} the free media repository",
   year = "2017",
   url = {\url{https://commons.wikimedia.org/w/index.php?title=File:Complexity_classes_(de).svg&oldid=249414083}},
   note = "[Online; zuletzt aufgerufen am 15. November 2017; Mittels Inkscape als PNG exportiert]",
 }

Please write where I have made an error and why this behaviour occurs. Many thanks in advance!

Best Answer

The url field is already treated as such by biblatex, so you don't need url = {\url{... rather url = {https... should be enough. With this the url is correctly printed.

Furthermore, the draft option omits the actual link. So, if you want it, you should remove the option.

\documentclass[german, hyperref = {hidelinks}, graphicx = {xelatex}]{beamer} % use larger type; default would be 10pt

\usepackage{filecontents}

\begin{filecontents}{\jobname.bib}
    @misc{wiki:cclasses,
        author = "Wikimedia Commons",
        title = "File:Complexity classes (de).svg --- Wikimedia Commons{,} the free media repository",
        year = "2017",
        url = {https://commons.wikimedia.org/w/index.php?title=File:Complexity_classes_(de).svg&oldid=249414083},
        note = "[Online; zuletzt aufgerufen am 15. November 2017; Mittels Inkscape als PNG exportiert]",
    }   
\end{filecontents}

% Reihenfolge: url -- hyperref -- biblatex  ???
% In most cases, hyperref should be loaded last. See https://tex.stackexchange.com/q/1863/105447

%\usepackage{url}  % Erleichtert das Setzen von URLs
% Not needed, as long as you load hyperref, for hyperref loads it by itself (and better not duplicate the call).

\usepackage{biblatex}  % für die ISBN-Nummer

%\usepackage[hidelinks]{hyperref}  % (Unscheinbar) verlinktes Inhaltsverzeichnis - sehr nützlich!
% Not needed, because beamer already calls hyperref.

\addbibresource{\jobname.bib}

\begin{document}
\begin{frame}
\frametitle{Quellen}
\nocite{*}
\printbibliography
\end{frame}
\end{document}

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I don't have the exact answer, but rather an observation. I would have posted this as a comment but I cannot because of my low reputation. I am also using TexMaker, and I wanted to put this link into my report:

http://www.swi-prolog.org/pldoc/doc_for?object=section(%27packages/http.html%27)

It didn't work, as one / was treated as a \. The forward slashes that are converted to back slashes are the ones following a ? in the url. In the url you provide, after preview.html there is a question mark so the rest becomes draft\93173\000001\BallisticHooke‌Pendulum. For my link, there's a question mark after doc_for, and the rest of the url is interpreted as object=section(%27packages\http.html%27).

As far as I've seen this is not a (pdf)Latex/MikTex problem. I have tried opening the same url with Adobe Reader and it works fine. It seems that only TexMaker gets it wrong on my computer. I am not sure why, however.

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When using the IEEEtran bibliography style and the hyperref package, it's a mistake to encase the contents of the url field in a \url{...} wrapper. You should just write

url = "https://www.weforum.org/agenda/2016/04/the-number-of-cars-worldwide-is-set-to-double-by-2040",

Incidentally, I think it would be a really good idea for you to backfill the year and organization fields of this entry.

The following example loads the xurl package, rather than the url package. The only difference is that the former allows linebreaks inside a formatted URL string at any letter.

\RequirePackage{filecontents}
\begin{filecontents}{testbib.bib}
@electronic{Smith2040,
  author= "Smith, Matthew Nitch",
  title = "The number of cars worldwide is set to double by 2040",
  year  = 2016,
  organization = "World Economic Forum",
  url   = "https://www.weforum.org/agenda/2016/04/the-number-of-cars-worldwide-is-set-to-double-by-2040" 
}
\end{filecontents}

\documentclass{IEEEtran}
\bibliographystyle{IEEEtran}
\usepackage[spaces,hyphens]{xurl} % allow arbitrary line breaks in a formatted URL string
\usepackage[colorlinks,allcolors=blue]{hyperref}

\begin{document}
\cite{Smith2040}
\bibliography{testbib}
\end{document}

Best Answer

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