@James – you could do "Pop-Ups" with MultiStateObjects (two states) where the first state is nearly empty, containing only a button that will have a "go-to-state-action" (go to state 2 in this case) and the second state contains your actual contents plus a button that has another "go-to-state-action" (go to state 1 in your case). The design of the button is up to you. It could be the exact design of the text below and be positioned exactly above the text.
If your output will be Fixed Layout EPUB, matters like that would be better discussed in a subforum for EPUB with InDesign:
You can draw invisible button (rectangle with no fill nor stroke) anywhere you like, for example on the top of the text. And then you can attach Play animation trigger to it - or some multistate object related action...
Here´s very fast example (click red CLICK ME text on the middle):
Indd-file (CC2014) if you want to play with it:
Thanks, Launder and Petteri! I used the "empty box object" trick all the time for web sites, so I don't know why that didn't occur to me. Duh moment I suppose! Still, I'm having a hard time getting the multi-state object idea to work. I can get the object to appear just like Petteri's example, but I can't get the second state--closing the window--to work. I've tried a couple of methods to get this to work, but It's not going. Any ideas?
You just need one MSO with two states.
The first state consists of a single button B1.
The second state is a single button B2 plus the pop-up contents.
Button B1 has a go-to-state action: Go To State 2 (label it: "Show more information" or something like that)
Button B2 has a go-to-state action: Go To State 1 (label it: "Close additional info")
It's best to define the actions of the buttons *after* the buttons are enclosed in the states. Not before.
I still couldn't quite get this working the way you describe, however, I discovered another option. I'm attaching an example for anyone who may find it useful. In this, button 1 (in black) brings in the pop-up box. Then, I use the same setup for button 2 (magenta) and use the "Reverse" option to close the box. Easy enough!
Thanks so much for the example! I now see what I did wrong with that way of doing it. Thanks again!