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Run callback anytime a component's 'value' is changed - or anytime a component property is changed

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Is there any way to do this?

Alternatively… any way to run a callback every time any component is updated?
I want to update the url of the app based on the inputs. But I don’t want to have to add every input manually… is there some property of the app that changes everytime a component is updated? Or some way to dynamically insert every component into the callback’s inputs? I’ve tried looping through layout.children, but the layout is generated via a function, and so that doesn’t seem to work for me…

I could use dcc.Interval and just fire it every second… ive considered that but its inelegant.

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