Store

To ensure that DOM doesn't change in the middle of an observation, replace code like...

 new Obs($)

...with code like...

 $.ensureConsistency(new Obs(_))

The currently selected option in a <select> dropdown.

The text value of the currently selected option in a <select> dropdown.

To ensure that DOM doesn't change in the middle of an observation, use this pattern:

 class Obs($: DomZipper) {

   // Before making any observations...
   private val checkConsistency = $.startConsistencyCheck()

   // ... obs here ...

   // After making all observations...
   checkConsistency()
 }

(This assumes you're using ErrorHandler.Throw)