Recalculate field with HTMLView

Hi all

I'm trying to recalculate a field on a view every time the view is shown (as in: everytime the app navigates to that view).

I see how this is done in the Cart sample app, but I don't know how to apply this to with HTMLView.

I'm not removing / unloading views/pages when I exit them, so onBeforeRender is only fired once.

Ideas, anyone?

Thanks!