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How to remove a PDF document level Javascript script using either Javascript or Python?

I am currently automating a PDF form creation workflow filling fields and comboboxes using a combination of Python (PyPDF2) and Javascript. I am actually using Python to inserting JS code at the document level for creating comboboxes in forms automatically populated with fresh database data.
The problem I found is, when an user opens the PDF, fills the form then save its combobox choices everything seems ok, but when they reopen the same PDF, those choices are gone because the document scripts reset the comboboxes again because the code run by itself every time it opens.
I am wondering if deleting those document scripts by setting a document action when the document is saved would solve the problem but I couldn't find any Javascript function for this.
If using only Javascript is impossible, can be done using Python? I couldn't find anything as well.
I would consider PDF API method :
this.removeScript("myScript");
But the problem is PyPDF2 generate JS function random names like this:
PS: This solution (partial solution) cannot be applied because my JS code length change constantly (dynamic)

Using a form to save/update settings in a db and build a HTML with those settings from a template

My limited experience in web development as a self-taught led me to hit a wall while trying to figure out how to deal with this problem.
I need a form (map_settings.php) where the user should enter some inputs. Those inputs must be saved in a database table (MAPS) and then used to create the final HTML file (e.g. map1.html) for that specific user/inputs.
I know how to deal with using forms and saving submitted data to a database.
What is completely obscure to me is how can I use those inputs to automatically generate the final HTML.
My idea is to have a template HTML (template.html) and each time a user saves new settings via the form, I copy the template and replace some variables inside it with the actual data the user has input in the form.
If this might matter, the variables I need to replace in the template are also JavaScript variables within a <script> tag.
Can anybody help me suggesting one viable way to do this? I am mostly using JavaScript and PHP, without frameworks. I've also red about JavaScript templating engines, but I sincerely did not get if those are useful to me in my case.
Anyway, here is an illustration of what I would need to do, to hopefully clarify better my point.

Creating a static HTML file per user is not the way to go. Instead just have a PHP script like mapdisplay.php or similar.
Make the script so that if you type mapdisplay.php?map=1 in the browser then it will read the map ID, get the relevant settings from the database for the map in question and then generate some HTML to display them - of course you can have most of the HTML ready made like a template, and just use PHP to fill in the details from the database. This idea of getting data on the fly when requested, and plugging it into some HTML is how most web applications work.
If you create a static HTML for each user it quickly becomes unmanageable with a large number of users, plus it's hard to introduce changes or improvements to the template because instead of just updating one script file, you have to back and re-do every existing page. There are other disadvantages to your approach too, but I won't continue here - you get the idea I hope.

If I were you I'll make that in this way:
Don't use template.html
Don't get data from database to new file, but from form
Make database test before make file
To make template use
$template_text = "text...text...html...text...".$php_varible."text...text...html...text";
For other things about php see w3schools

Javascript - Read file and compare content

I'm having a file which contains a couple of space separated (or comma separated, it will be editable) serial-numbers (all unique).
Now through my Oracle APEX I get one serial-number. My goal is to check if this serial code which could be passed on to a parameter of obtained through $v('P#_SERIAL_ID') is equal to one of the serial-numbers in the file.
Is this even possible within Javascript? If so, is there an existing function/code to achieve my goal?
Stackoverflow questions that didn't help me but look alike:
Javascript-read-file-contents
C#-reading-and-editing-file
Java-string-comparison

You can do this without JavaScript. Import your file into Apex through an Data Load Wizard Page so you will have the content of your file into a table. This way you can compare your information through some kind of SQL validation.
If you don`t like the Data Load Wizard Page you can add a file browse item on a simple page that will take your file and save it as a blob into the database. From there you can again process the file and compare the values.

Saving / Retriving all the fields value's of an HTML form into / from a local file using JavaScript

I have a typical HTML form, with some fields of various types on it.
What I'm trying to achieve is the following:
Once the form's input fields are filled out with values, a button to be able to save all the filled-out field/value pairs into a local file of some sort that allows me in a future ocassion to...
Automatically fill the very same HTML form by retriving the field/values pairs from said file instead of typing them manually.
Ideally this would have to be achived thru JavaScript, because the webpage that contains the HTML form is served by an embedded system where PHP or other server side scripting is not available.
Is it possible to achive this thru JavaScript (or any other browser-side effort method)? If so, how?
Many thanks.
EDIT: The target environment is a regular user in a regular PC/laptop using any one of the 4 major browsers. It's acceptable to have "Cookies enabled" and "latest browser version installed" as requisites, but external plugins/addins are not.
Later: NullUserException has achived something in this direction. He's been able to read from a local file using JavaScript:
Using a local file as a data source in JavaScript

I think, for your particular site you can store data in local storage. Only your application will be able to access to that data. Also you can encrypt it before storing.
You can refer
diveintohtml5.info/storage to start with.
Happy coding.

Pretty sure you won't be able to save a file locally and then pick it up again.
However there are obviously cookies but there, and this is only in a modern browser, is also LocalStorage that can hold quite a bit of data that can be retrieved by Javascript and jQuery.
This is probably the way I would go but it does depend on your browser version.

question is some what ambiguous please specify what you are trying to do.
i can't tell if you want to do something just for you if so:
https://addons.mozilla.org/en-US/firefox/addon/greasemonkey/

Retrieving a csv file from web page

I would like to save a csv file from a web page. However, the link on the page
does not lead directly to the file, but it calls some kind of javascript, which leads
to the opening of the file. In other words, there is no explicit url address for the
file i want to download or at least I don't know what it should be.
I found a way to download a file by activating Internet Explorer,going to the web page
and pressing the link button and then saving the file through the dialog box.
This is pretty ugly, and I am wondering if there is a more elegant (and fast) method to retrieve a file without using internet explorer(e.g. by using urllib.retrieve method)
The javascript is of the following form (see the comment, it does not let publish the source code...):
"CSV"
Any ideas?
Sasha

You can look at what the javascript function is doing, and it should tell you exactly where it's downloading from.

I had exactly this sort of problem a year or two back; I ended up installing the rhino javascript engine; grepping the javascript out of the target document and evaluating the url within rhino, and then fetching the result.