BibLaTeX Prefix in Citation

Question

When citing an @online source I would like to give it the prefix "Internet: ".

For example:

Internet: Some Internet Source 2017

Is there an easy way to accomplish this without having to define a custom command?

Answer 1

Please see the following MWE:

\RequirePackage{filecontents}
\begin{filecontents*}{\jobname.bib}
@article{einstein,
  author  = {Albert Einstein},
  title   = {{Zur Elektrodynamik bewegter Körper}. ({German}) 
             [{On} the electrodynamics of moving bodies]},
  journal = {Annalen der Physik},
  volume  = {322},
  number  = {10},
  pages   = {891--921},
  year    = {1905},
  DOI     = {http://dx.doi.org/10.1002/andp.19053221004},
}
@online{ApoG,
  Address = {03.08.2013},
  Edition = {15.10.1980},
  Publisher = {juris GmbH},
  Title = {ApoG - Gesetz {\"u}ber das Apothekenwesen},
  Url = {www.juris.de/purl/gesetze/_ges/ApoG},
  Year = {1980},
}
\end{filecontents*}


\documentclass{article}

\usepackage[utf8]{inputenc} %
\usepackage[T1]{fontenc}    %

\usepackage[
  backend=biber, % bibtex  % bibtex or biber (prefered)
  style=numeric
]{biblatex}
\addbibresource{\jobname.bib} % calls bib file to create the bibliography

\begin{document}
We cite online document~\cite[Internet:][]{ApoG} or % <=================
Einstein~\cite[Internet:][page~893]{einstein}. % <======================

\printbibliography
\end{document}

The command \cite[prenote][postnote]{key} results---depending of the used style---in for example [prenote 2, postnote].

The MWE results in: