add persistence to html.Button's n_click property

[michaelbabyn]

I wonder if it makes sense to add persistence to html.Button since n_clicks is often used as an input to callbacks.

cc @plotly/dash-core , @sudburyrob

[alexcjohnson]

Interesting… normally n_clicks is used as a trigger, it’s value irrelevant. Do you have an example use case for persistence here?

[michaelbabyn]

The use case here is a multipage app that generates a graph after being triggered by a button click (which the users presses after secting a couple of other controls which are used as State). So the value of n_clicks would in effect be storing "whether the user had decided to generate a graph or not".