How to have this input Form Field on many lines?

Question

I want to have \q{} many lines, while it is designed for one line now. For example, take value from 2 to the maximum amount of lines per frame. Code based on Christian's thread answer Creating fillable PDFs.

% https://tex.stackexchange.com/a/14845/13173
\documentclass{beamer}
\usetheme{Berkeley}

%https://tex.stackexchange.com/a/14845/13173
    \usepackage[latin1]{inputenc} 

    \newdimen\longline
    \longline=\textwidth\advance\longline-4cm

    \def\LayoutTextField#1#2{#2} % override default in hyperref

    \def\lbl#1{\hbox to 4cm{#1\dotfill\strut}}%
    \def\labelline#1#2{\lbl{#1}\vbox{\hbox{\TextField[name=#1,width=#2,bordercolor=white]{\null}}\kern2pt\hrule}} % https://tex.stackexchange.com/a/374712/13173

    \def\q#1{\hbox to \hsize{\labelline{#1}{\longline}}\vskip1.4ex}

\begin{document}

\section{Lorem}
\begin{frame}
  \begin{Form}
    \q{Merkki:} % TODO have here many lines
%   \q{}
%   \q{}
  \end{Form}
\end{frame}

\end{document}

Output in Fig. 1

Fig. 1 Output with only one line

Expected output: to have many lines (etc 3) for the input, and show the input on another page

Testing UlrikeFisher's proposal in one environment

Code

\documentclass{beamer}
\usepackage[english]{babel}
\usetheme{Berkeley}

%\usepackage[margin=1pt]{geometry}% http://ctan.org/pkg/geometry % Beamer loads geometry already!

% https://tex.stackexchange.com/a/387474/13173
\usepackage{xparse,calc}
\usepackage{eforms}

\begin{document}

\begin{frame}{Henkil\"{o}tiedot}
 % #Henkilotiedot https://tex.stackexchange.com/a/387474/13173
 \medskip
 \textField[
    \Ff\FfMultiline
    \Ff\FfDoNotSpellCheck
           ]
  {myinput}{\dimexpr\linewidth-10ex}{5\baselineskip}
\end{frame}

% https://tex.stackexchange.com/a/385265/13173
\pdfpagewidth 21cm
\pdfpageheight 29.7cm

%% #Henkilotiedot
 \textField[
    \Ff\FfMultiline
    \Ff\FfDoNotSpellCheck
    \Ff\FfReadOnly
    \AA{\AACalculate{event.value=getField("myinput").value;}}
           ]
  {myoutput}{\dimexpr\linewidth-10ex}{5\baselineskip}

% https://tex.stackexchange.com/q/385438/13173
\newcommand*{\TableA}{%
%  \textcolor{gray}{\rule{.5\linewidth}{10cm}}%
    \begin{table}[hpt]
        \setlength\tabcolsep{1pt} % default value: 6pt % https://tex.stackexchange.com/a/201117/13173

        \begin{tabular}{|p{.2cm}|l|l|l|l|l|l|l|p{.2cm}|}
        \hline
        \rot{{\tiny\textbf{Avain muuttuja}}} 
        & \textbf{V2} & \textbf{V1} & \textbf{V0} 
            & \textbf{TESTI Muuttujat} 
            & \textbf{P1} & \textbf{P2} & \textbf{P3} 
            & \rot{{\tiny\textbf{Kriittinen muuttuja}}} \\ \hline
         &  &  &  & 1. Sosiaaliset taidot &  &  & & \\ \hline
         &  &  &  & 2. Ihmissuhteet (TS: K/E)* &  &  & & \\ \hline
         &  &  &  & 3. Ammatillinen arvio &  &  & & \\ \hline
        \end{tabular}
    \end{table}
}
\newcommand*{\TableB}{%
  \textcolor{red}{\rule{.5\linewidth}{3cm}}%
}
\newcommand*{\TableC}{%
  \textcolor{green}{\rule{.5\linewidth}{3cm}}%
}
\newcommand*{\TableD}{%
  \textcolor{blue}{\rule{.5\linewidth}{3cm}}%
}


% Show summary here from Page 1 and 2
\begingroup
\setbeamertemplate{navigation symbols}{}%remove navigation symbols
\section{Summary}
\begin{frame}[plain]
    \vskip 1.5cm
    \hspace*{-1.7cm}% to leave 1.0 cm margin
\begin{minipage}{19cm}
    \begin{center}
    TESTI
    \end{center}


    % Pisteytyskohta https://tex.stackexchange.com/q/385438/13173
    \begin{adjustbox}{max width=\textwidth}
        \sbox0{\TableA}%
        \noindent
        \vtop{%
          \kern0pt % Align at the top
          \copy0 %
        }%
        \kern-.2pt %
        \vrule
        \kern-.2pt %
        \vtop to \dimexpr\ht0+\dp0{%
          \kern0pt % Align at the top
          \hbox{\TableB}%
          \vfill
          \hbox{\TableC}%
          \vfill
          \hbox{\TableD}%
        }
    \end{adjustbox}

\end{minipage}
\end{frame}

% these below eventually are not needed, if this is the last slide of your document
\makeatletter
\pdfpagewidth \beamer@paperwidth
\pdfpageheight \beamer@paperheight
\makeatother
\endgroup

\end{document}

Fig. 2 Page setting is affected by the environment

OS: Debian 9
TeXLive: 2017
Acrotex installation: here

Answer 1

It is a bit unclear what you mean with many lines. But in case that you want a multiline text field, here an example with eforms. To get the value to the output page you can either use the same field name (but then you can't give them different "readonly" values), or use javascript (this needs a pdf viewer that can handle it):

\documentclass{beamer}
\usetheme{Berkeley}
\usepackage[utf8]{inputenc}
\usepackage{xparse,calc}
\usepackage{eforms}
\begin{document}
\begin{Form}
\begin{frame}{Input}
 Question:  Say something about ....

 \medskip

 \textField[
    \Ff\FfMultiline
    \Ff\FfDoNotSpellCheck
           ]
  {myinput}{\dimexpr\linewidth-10ex}{5\baselineskip}

\end{frame}
\begin{frame}{Output}


 \textField[
    \Ff\FfMultiline
    \Ff\FfDoNotSpellCheck
    \Ff\FfReadOnly
    \AA{\AACalculate{event.value=getField("myinput").value;}}
           ]
  {myoutput}{\dimexpr\linewidth-10ex}{5\baselineskip}

\end{frame}
\end{Form}
\end{document}

Answer 2

I cannot test this without Adobe Reader (or another compliant PDF viewer). However, this should work based on the usual behaviour. Moreover, comments say this does work as expected, even with the command wrapper used here.

Basically, if you give two text fields the same name, then filling in one populates both. I know this because I never want this behaviour and I have sometimes caused it accidentally, only to discover in class than I cannot fill out two different text fields with different content. (When I get to the second slide with a field of the same name, the field is pre-populated with an earlier answer. I can delete it and write a new answer, but that erases what I've input on the earlier slide.)

However, Okular does not appear to respect this behaviour, so I can't check that wrapping this in a macro works correctly. (Adobe crashes on Linux before you have time to blink. Well, first it takes a few hours to start. Then it freezes. Then it crashes before you have time to blink. Generally. It is not as predictable as one might like.)

Here's my original answer for the multiple single-line fields case. (See below for a multiple multi-line fields case.)

\documentclass{beamer}
\usetheme{Berkeley}
\usepackage[utf8]{inputenc}
\usepackage{xparse,calc}
\makeatletter
\newlength\textinput@labelwd
\newlength\textinput@fieldwd
\newlength\textinput@ht
\setlength\textinput@labelwd{40mm}
\setlength\textinput@fieldwd{\textwidth-40mm}
\setlength\textinput@ht{12pt}
\def\LayoutTextField#1#2{%
  \makebox[\textinput@labelwd]{\strut #1: \dotfill{} }#2%
}
\NewDocumentCommand\textinput{ s o +m }{%
  \IfValueTF{#2}{\edef\textinput@tempa{#2}}{\edef\textinput@tempa{#3}}%
  \IfBooleanTF{#1}{\edef\textinput@tempb{true}}{\def\textinput@tempb{false}}%
  \TextField[charsize={10pt},multiline=false,height=\textinput@ht,width={\textinput@fieldwd},name={\textinput@tempa},bordercolor={1 1 1},readonly=\textinput@tempb]{#3}%
}
\makeatother
\begin{document}
\begin{Form}
  \begin{frame}{Input}
  \textinput{Merkki}

  \textinput[qna]{Qn.~A}

  \textinput[qnb]{Qn.~B}

  \textinput[merkki2]{Merkki}
\end{frame}
\begin{frame}{Output}
  \textinput{Merkki}

  \textinput[qna]{Qn.~A}

  \textinput[qnb]{Qn.~B}

  \textinput[merkki2]{Merkki}
\end{frame}
\end{Form}
\end{document}

Note that it probably matters that the frames occur in the same Form. However, I've never tried using Form inside a frame so I can't be sure of this. (I just always have \begin{document}\begin{Form} ... \end{Form}\end{document} in Beamer presentations.)

Here's an uninformative screenshot from Okular:

EDIT

Here's a multiple multi-line fields case, which is apparently what's wanted here.

\documentclass{beamer}
\usetheme{Berkeley}
\usepackage[utf8]{inputenc}
\usepackage{xparse,calc,xcoffins}
\makeatletter
\newlength\textinput@labelwd
\newlength\textinput@fieldwd
\newlength\textinput@ht
\setlength\textinput@labelwd{40mm}
\setlength\textinput@fieldwd{\textwidth-40mm}
\setlength\textinput@ht{15mm}
\NewCoffin\textinputcoffin
\def\LayoutTextField#1#2{%
  \SetVerticalCoffin\textinputcoffin{\textinput@labelwd}{%
    \strut #1: \dotfill{} %
  }%
  \TypesetCoffin\textinputcoffin[t,l](0pt,\textinput@ht)#2%
}
\NewDocumentCommand\textinput{ s o +m }{%
  \IfValueTF{#2}{\edef\textinput@tempa{#2}}{\edef\textinput@tempa{#3}}%
  \IfBooleanTF{#1}{\edef\textinput@tempb{true}}{\def\textinput@tempb{false}}%
  \TextField[charsize={10pt},multiline=true,height=\textinput@ht,width={\textinput@fieldwd},name={\textinput@tempa},bordercolor={1 1 1},readonly=\textinput@tempb]{#3}%
}
\makeatother
\begin{document}
\begin{Form}
  \begin{frame}{Input}
  \textinput{Merkki}

  \textinput[qna]{Qn.~A}

  \textinput[qnb]{Qn.~B}

  \textinput[merkki2]{Merkki}
\end{frame}
\begin{frame}{Output}
  \textinput{Merkki}

  \textinput[qna]{Qn.~A}

  \textinput[qnb]{Qn.~B}

  \textinput[merkki2]{Merkki}
\end{frame}
\end{Form}
\end{document}

And an equally uninformative screenshot from Okular again:

Note that Okular does show the fields, but not in screenshots.