hyperref form and insdljs problem saving

I have written a form with LaTeX using hyperref and I have embedded some Java code (using insdljs). I am not a Java programmer at all, but I find it quite intuitive, at least for what I am doing.

Hereafter there is a minimum example:

\documentclass[12pt,a4paper]{article}
\usepackage{hyperref}
\usepackage[pdftex]{insdljs}

\begin{insDLJS}[setcom]{setcom}{JavaScriptAtDocumentLevel}

// set days array
var days = [["gg"],["01"],["02"],["03"],["04"],["05"],["06"],["07"],["08"],["09"],["10"],["11"],["12"],["13"],["14"],["15"],["16"],["17"],["18"],["19"],["20"],["21"],["22"],["23"],["24"],["25"],["26"],["27"],["28"],["29"],["30"],["31"]];

//populate the values to giorni and others
this.getField("giorni1").setItems(days);
this.getField("giorni2").setItems(days);
this.getField("giorni3").setItems(days);

// set months array
var months = ["mm","gen","feb","mar","apr","mag","giu","lug","ago","set","ott","nov","dic"];

// populate the values to mesi and others
this.getField("mesi1").setItems(months);
this.getField("mesi2").setItems(months);
this.getField("mesi3").setItems(months);

// set future years
var futureYear = [["aaaa","aaaa"],["2019","19"],["2020","20"],["2021","21"],["2022","22"],["2023","23"],["2024","24"],["2025","25"],["2026","26"],["2027","27"],["2028","28"],["2029","29"],["2030","30"],["2031","31"],["2032","32"],["2033","33"],["2034","34"],["2035","35"],["2036","36"],["2037","37"],["2038","38"],["2039","39"],["2040","40"],["2041","41"],["2042","42"],["2043","43"],["2044","44"],["2045","45"]];

// populate the values to annofuturo
this.getField("annofuturo1").setItems(futureYear);
this.getField("annofuturo2").setItems(futureYear);
this.getField("annofuturo3").setItems(futureYear);

\end{insDLJS}

\begin{document}

\begin{flushleft}
\normalsize

\begin{Form}

\fbox{
\parbox{\textwidth}{
}
}

\fbox{
\parbox{\textwidth}{
}
}

\fbox{
\parbox{\textwidth}{
}
}

\end{Form}
\end{flushleft}
\end{document}


The two problems I have are:

1. I want my tex file as compact as possible. Imagine that days, months and future years will be called several times and for each \ChoiceMenu[parameters]{label}{choices} I do not want to repeat the {choices} all the times, I want to store them and assign them (or call them).
2. The selected choices in my \ChoiceMenu are not saved in the pdf file when, after selecting them, I save, close and open the pdf again. It is like the pdf file gets reset each time I open it. Oddly enough, the pdf preview inside texstudio has the correct choices stored and displayed.

The two problems are related, i.e. if I do not declare any java variable and put all the entries in the {choices} field every time I do not have problem number 2, but I do have problem number 1.

So, my question is: do you know any other way to save space and time (problem 1) and/or make the changes to the pdf file effective (problem 2)?

So far, I have made some thoughts, which I do not know how to put into practice:

1. I could e.g. declare an array of strings (like in python) and call it instead of repeating the {choices} for each \ChoiceMenu. Is there anything alike in latex?
2. I could add some [parameters] to the \ChoieMenu like onexit={}, but as I am not a Java expert I do not know what to put in it.