How do I make a series of text links from a directory of html files

This is in reference to
https://www.experts-exchange.com/questions/22949794/how-do-I-collect-links-from-pages-in-a-directory-and-make-a-drop-down-box.html

I would like this script to also generate a list of the index pages used to generate the drop down list.  This text list will be layed out in a table, with each cell containing a linked number to its corresponding index##.htm page.  The table should be generated dynamically.

Also, I would like that the links in the drop down list somehow include the corresponding index##.htm into each of its generated links, so that I may use a javascript to 'grab' that info for other use.

Thanks