Question

I recently found and applied the changeTracker/dirtyFlag approach successfully in my code and everything was good. Very neat and useful. Though, today, I was trying to use it again and something weird was happening: the somethingHasChanged trigger was firing as soon as I opened the page.

I looked, searched and nothing. I was not doing any change to the observables after setting the tracker.
After a couple of hours of this, I found the root of the problem:

One of the observables is binded to a <select> element thus setting the currently selected <option>.

If I remove this binding, it no long triggers.
I don’t know why this happens, since the value is only read (supposedly).

Any thoughts on this?

Answer 1

My guess would be that you are binding against numeric values and the selected one is being written back to your view model as a string, as KO reads it out of the DOM element.