Hyperlink to hyperlinkTextDestination in external document

Question

I have an InDesign book (.indb) with one document for each chapter, plus one document for the table of contents.  I'm trying to automate the process of making a hyperlink from each item in the TOC to a hyperlinkTextDestination I've already added to each of the other documents.  This way, when I Export for Digital Editions, I have copy of my TOC with hyperlinks to each chapter.
My TOC is just a simple page with a textFrame, with each link on its own line, like this:
Chapter 1
Chapter 2
Chapter 3
Can anyone please describe how to do this in JavaScript?  Thanks in advance for any help.

Answer 1

I was finally able to figure out the problem, and since I haven't been able to find anything on this specific topic elsewhere, I'll post it here for posterity.
The main problem was that my destination document was closed when I tried to create the hyperlink.  I stored the hyperlinkTextDestinations for each doc into an array so I could call them later, and then closed the document so the script could do other stuff.  Anyway, here are the code snippets pertinent to hyperlinking to external hyperlinkTextDestinations:
var mydocs = bookPath.getFiles('*.indd');  // Folder containing each chapter's document
var hyperlinkDestinations = new Array;
for (i=0; i<mydocs.length; i++){
  var thisDoc = app.open(mydocs[i]);
  // Add hyperlink destinations
  var newDestination = thisDoc.hyperlinkTextDestinations.add(thisDoc.textFrames[0].insertionPoints[0]);
  hyperlinkDestinations.push(newDestination);
  thisDoc.close();
Then in my TOC document:
var tocdoc = app.activeDocument;
var toc = tocdoc.textFrames[0].paragraphs;
for (i=0; i<toc.length; i++) {
  // My TOC list is in the same order as my files are...
  var myHyperlinkTextSource = tocdoc.hyperlinkTextSources.add(toc[i]);
  var tempDoc = app.open(mydocs[i]); // Make sure doc is open before referencing hyperlinkTextDestination
  var myHyperlink = tocdoc.hyperlinks.add(myHyperlinkTextSource, hyperlinkDestinations[i]);
  tempDoc.close();
This isn't my exact code (I just copied out bits and pieces), so I haven't tested it.  If anyone knows a better way of doing this, feel free to chime in.
I've taken a pretty deep dive into InDesign scripting and this forum has been incredibly helpful, so I hope this pays it forward, at least a little.  Thanks!