CheckBox (from hyperref) - tick by default

Question

This may seem basic, but is there a way to make checkboxes ticked automatically? E.g.

\documentclass{minimal}
\usepackage{hyperref}

\begin{document}
\begin{Form}

\CheckBox[name=ch1]{Yes}

\end{Form}
\end{document}

giving

I'd like the above to be checked by default. Then in the .pdf one can uncheck it by clicking on the box as required.

I'm reading the hyperref manual and under 6.2 Forms optional parameters it lists the option with default as checked boolean false - I'm not sure how to pass this into \begin{Form} with a new default.

If there's an alternative method not involving hyperref I'm open to that also.

Am using EMACS & Auctex. If this is possible and there's some simpler way I could have looked it up (e.g. show/modify defaults for Form environment) up would be grateful for any pointers.

Answer 1

The check box must have the option checked:

\documentclass{minimal}
\usepackage{hyperref}

\begin{document}
\begin{Form}
\CheckBox[checked,name=ch1]{Yes}

\end{Form}
\end{document}

For change the default you can use in the preamble:

\makeatletter
\Fld@checkedtrue
\makeatother

Or only for some form:

\documentclass{minimal}
\usepackage{hyperref}

\begin{document}

\begin{Form}
\makeatletter\Fld@checkedtrue\makeatother 
\CheckBox[name=ch1]{Yes}
\CheckBox[name=ch1]{No}
\end{Form}


\begin{Form}
\makeatletter\Fld@checkedfalse\makeatother 
\CheckBox[name=ch1]{Yes}
\CheckBox[name=ch1]{No}
\end{Form}

\end{document}