Renew command for \parencite if db entry type is @online

Question

I need to change the command \parencite for a specific case but I have absolutely no clue how to rewrite ist. Could anyone help me?

What I have as a database entry is this:

@online{ref1,
   author = {{A Company}},
   title = "Page Title",
   year = "no date",
   url = {https://url.xy},
   urldate = "2017-10-14"
}

If I now use \parencite, I will get

Some text (A Company, no date).

But what I need is

Some text (A Company, online).

So basically, I need to overwrite \parencite for the following criteria:

• IF the db entry is @online AND IF there is "no date" specified in 'year', PRINT (author, online).
• IF there are several entries of the same author and declared with @online without a date, PRINT (author (a), online).
• In every other case, use the APA-Citation style as before
• No impacts on bibliography!

MWE:

\documentclass[a4paper,10pt]{article}
\usepackage[utf8]{inputenc}
\usepackage[german]{babel}

\usepackage[style=apa]{biblatex}
\usepackage{csquotes}
\DeclareLanguageMapping{ngerman}{ngerman-apa}
\addbibresource{references.bib}
\NewBibliographyString{from}
\NewBibliographyString{retrieved}
\DefineBibliographyStrings{ngerman}{
   retrieved = {Abgerufen am},
   from = {von},
   nodate = {{}},
}
\DeclareFieldFormat[online]{title}{\mkbibemph{#1}}

\begin{filecontents}{\sample.bib}
    @online{ref1,
       author = {{A Company}},
       title = "Title",
       year = "no date",
       url = {https://url.xy},
       urldate = "2017-11-15"
    }

    @online{ref2,
       author = {{A Company}},
       title = "Page Title",
       year = "no date",
       url = {https://url.xy},
       urldate = "2017-10-14"
    }
 \end{filecontents}
 \begin{document}
 There is some text \parencite{ref1} and some other \parencite{ref2}.
 \printbibliography
 \end{document} 

Answer 1

Obligatory warning: Any changes to biblatex-apa will result in a style that is not APA-compliant any more. Proceed with care and only if you must.

I am working under the assumption that your text is written in nswissgerman as discussed in the comments.

The macro cite:plabelyear+extradate prints the year in citations. The macro is modified to not print nodate but to skip the year and print the entry type (online in this case) instead.

There is no need to write year = {no date} or similar if there is no date. Just don't give a year at all if there is none. biblatex can figure the rest out on its own.

\documentclass[a4paper,10pt]{article}
\usepackage[utf8]{inputenc}
\usepackage[nswissgerman]{babel}

\usepackage[style=apa]{biblatex}
\usepackage{csquotes}
\addbibresource{\jobname.bib}
\NewBibliographyString{from}
\NewBibliographyString{retrieved}
\DefineBibliographyStrings{nswissgerman}{
  retrieved = {Abgerufen am},
  from      = {von},
  nodate    = {{}ohne Datum},
}

\DeclareFieldFormat{extradate:special}{\bibhyperref{\mkbibparens{\mknumalph{#1}}}}
\newbibmacro*{cite:plabelyear+extradate}{%
  \iffieldundef{labelyear}{}
    {\iffieldequalstr{labelyear}{nodate}
       {\setunit{\addspace}%
        \printfield[extradate:special]{extradate}%
        \setunit{\addcomma\space}%
        \printfield{entrytype}}
       {\printtext[bibhyperref]{%
           \clearfield{labelmonth}% don't want months in citations
           \clearfield{labelday}% don't want days in citations
           \clearfield{labelendmonth}% don't want months in citations
           \clearfield{labelendday}% don't want days in citations
           \iffieldsequal{labelyear}{labelendyear}% Don't want no-op year ranges
             {\clearfield{labelendyear}}
             {}%
           \iffieldundef{origyear}{}
             {\ifboolexpr{ test {\iforigdatecirca} or test {\iforigdateuncertain} }
               {\mkbibbrackets{\printorigdate}}
               {\printorigdate}%
              \setunit*{\addslash}}%
          \ifboolexpr{ test {\iflabeldatecirca} or test {\iflabeldateuncertain} }
            {\mkbibbrackets{\printlabeldateextra}}
            {\printlabeldateextra}}%
        \iffieldundef{issue}
          {}
          {\addcomma\addspace\printfield{issue}}}}}

\DeclareFieldFormat[online]{title}{\mkbibemph{#1}}
\usepackage{filecontents}
\begin{filecontents}{\jobname.bib}
@online{ref1,
  author = {{A Company}},
  title = "Title",
  url = {https://url.xy},
  urldate = "2017-11-15"
}

@online{ref2,
  author = {{A Company}},
  title = "Page Title",
  url = {https://url.xy},
  urldate = "2017-10-14"
}
\end{filecontents}
\begin{document}
There is some text \parencite{ref1} and some other \parencite{ref2}.
\printbibliography
\end{document}