Argthtjtr

im wondering if i can create a hyperlink that automaticaly uses the bib file stored tag 'url' somehow? Just to prevent mistakes in linking to a reference and to a websource in the same text like:

mwe:

documentclass{article}

usepackage{filecontents}

usepackage[style=nature, url=true]{biblatex}

usepackage{hyperref}

begin{filecontents}{jobname.bib}

@online{UseCase20,

  title = {{Use-Case 2.0 ebook}},

  journal = {Ivar Jacobson International},

  year = {2014},

  month = {Jul},

  note = {[Online; accessed 25. Dec. 2018]},

  url = {https://www.ivarjacobson.com/publications/white-papers/use-case-ebook}

}

end{filecontents}

addbibresource{jobname.bib}



begin{document}

href{https://www.ivarjacobson.com/publications/white-papers/use-case-ebook}{sometext} footcite{UseCase20}

printbibliography

end{document}

i wold like to something like this work:

documentclass{article}

usepackage{filecontents}

usepackage[style=nature, url=true]{biblatex}

usepackage{hyperref}

begin{filecontents}{jobname.bib}

@online{UseCase20,

  title = {{Use-Case 2.0 ebook}},

  journal = {Ivar Jacobson International},

  year = {2014},

  month = {Jul},

  note = {[Online; accessed 25. Dec. 2018]},

  url = {https://www.ivarjacobson.com/publications/white-papers/use-case-ebook}

}

end{filecontents}

addbibresource{jobname.bib}



begin{document}

href{citeurl{UseCase20}}{sometext} footcite{UseCase20}

printbibliography

end{document}

but unfortunately this breaks at l.18;

href{citeurl{UseCase20}}{sometext}

EDIT:

MWE with all tests:

documentclass{article}

usepackage{filecontents}

usepackage[style=nature, url=true]{biblatex}

usepackage{hyperref}

begin{filecontents}{jobname.bib}

@online{UseCase20,

    title = {{Use-Case 2.0 ebook}},

    journal = {Ivar Jacobson International},

    year = {2014},

    month = {Jul},

    note = {[Online; accessed 25. Dec. 2018]},

    url = {https://www.ivarjacobson.com/publications/white-papers/use-case-ebook}

}

end{filecontents}

addbibresource{jobname.bib}

%https://tex.stackexchange.com/a/413372/118709

DeclareCiteCommand{citelink}

    {boolfalse{citetracker}%

        boolfalse{pagetracker}%

        usebibmacro{prenote}}

    {iffieldundef{postnote}

        {href{thefield{url}}{printfield{title}}}

        {href{thefield{url}}{thefield{postnote}}}}

    {multicitedelim}

    {}

% https://tex.stackexchange.com/a/412927/118709

DeclareCiteCommand{citeqrurl}

  {boolfalse{citetracker}%

   boolfalse{pagetracker}%

   usebibmacro{prenote}}

  {qrcode{thefield{url}}}

  {multicitedelim}

  {usebibmacro{postnote}}

% https://tex.stackexchange.com/a/413519/118709

DeclareCiteCommand{geturl}

    {boolfalse{citetracker}boolfalse{pagetracker}}

    {iffieldundef{postnote}

        {xdefbiburl{thefield{url}}}

        {%

            edefgeturlTmpCmd{csfield{postnote}}%

            expandafterxdefgeturlTmpCmd{thefield{url}}%

        }%

    }

    {}

    {}

begin{document}

~\

citelink{sometext}{UseCase20}footcite{UseCase20}\

~\

citeqrurl{sometext}{UseCase20}footcite{UseCase20}\

~\

geturl{UseCase20}

%The href{biburl}{UseCase}footcite{UseCase20}\.

printbibliography

end{document}

citeurl does not return the URL of the entry in question (in an expandable way), instead it is meant to print the formatted URL. That means that it can't be used as the URI argument for href. If you want to be able to href the URL of an entry to arbitrary text, the simplest way is to create a new cite... macro. Since cite... macros have a fixed argument structure the one below works as follows

citehrefurl[<arbitrary text that is going ot be linked>]{<entrykey>}

You could create a new command with arbitrary arguments. Usually I strongly advise against creating new commands from cite... commands via newcommand, but in this case we can make an exception.

documentclass{article}

usepackage[style=nature, url=true]{biblatex}

usepackage{hyperref}



DeclareCiteCommand{citehrefurl}

  {boolfalse{citetracker}%

   boolfalse{pagetracker}}

  {iffieldundef{url}

     {PackageWarning{biblatex}

        {The entry thefield{entrykey} has no URL.MessageBreak

         No link will be created}%

      printfield{postnote}}

     {href{thefield{url}}

        {iffieldundef{postnote}

           {PackageWarning{biblatex}

              {Text argument missing,MessageBreak

               using the title for entryMessageBreak

               thefield{entrykey}}%

            printfield[citetitle]{labeltitle}}

           {printfield{postnote}}}}}

  {}

  {}



newcommand*{citehrefurlwrap}[2]{citehrefurl[#2]{#1}}



usepackage{filecontents}

begin{filecontents}{jobname.bib}

@online{UseCase20,

  title   = {Use-Case 2.0 ebook},

  author  = {Ivar Jacobson and Ian Spence and Kurt Bittner},

  date    = {2011-12},

  url     = {https://www.ivarjacobson.com/publications/white-papers/use-case-ebook},

  urldate = {2018-12-25},

}

end{filecontents}

addbibresource{jobname.bib}



begin{document}

citehrefurl{UseCase20}



citehrefurl[some text]{UseCase20}



citehrefurlwrap{UseCase20}{some other text}



citeurl{UseCase20}



href{https://www.ivarjacobson.com/publications/white-papers/use-case-ebook}{sometext}



printbibliography

end{document}

_{Sorry there is no image at the moment. I'm having trouble uploading them. Feel free to add a screenshot of the result if you like.}

This is basically a slightly modified version of jakun's citelink from their answer to How to create a link to a URL provided in a bib file with custom text which was in turn inspired by Create QR-code from citeurl.