Get the current shown text

current_text.js

Book.on("renderer:visibleRangeChanged", function(cfirange) {
  var text = '';
  var cfi = new EPUBJS.EpubCFI();
  var startRange = cfi.generateRangeFromCfi(cfirange.start, Book.renderer.render.document);
  var endRange = cfi.generateRangeFromCfi(cfirange.end, Book.renderer.render.document);
  // Create a new range to handle full cfi range (this should be fixed in v0.3)
  var fullRange = document.createRange();

  if (startRange) {
    fullRange.setStart(startRange.startContainer, startRange.startOffset);
  }

  if (endRange) {
    fullRange.setEnd(endRange.startContainer, endRange.startOffset);
  }

  text = fullRange.toString();
  console.log(text);
});

hello Fchasen,

I know that the example here shows how to select everything on the page.
what I want is to be able to programmatically select a portion of the visible page.
pls help.