For all these you need Adobe Acrobat Pro DC. I get it through a subscription to the Creative Cloud Suite

The Acrobat Javascript Acrobat reference

This one is older but still has good examples

Good source for beginner examples

Detailed  article “describes how to use Javascript code to create interactive PDF documents.”

The Acrobat Developer Center

Example code to load values from a text file called "data.txt" which would be stored with the pdf form.

Question dialogue to “I want  read data form txt files from local hard drive and ,  set this data as value (for select element).”

Link to Acrobat SDK

Example code from ByteScout. ByteScout is a commercial  offering of pdf, barcoding, imaging and data extraction products.

Good search link

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