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How to search app.layout variable?

I have standard dashboard with app.layout variable. How can I search for a given div and some content somewhere inside my application? I need it to make some checks, (for infinite loop exception, anyways, whatever).

What should I use? Can I use Xpath and how?

Dash Components implement the MutableMapping interface, which means they define the following methods:

# - __getitem__
# - __setitem__
# - __delitem__
# - __iter__
# - __len__

__getitem__(), in particular, means that you can do:

if "some-id" in app.layout:
    print("hooray")

and

some_component = app.layout["some-id"]

Thereโ€™s also Component.traverse() and Component.traverse_with_paths() that you might find useful.

See https://github.com/plotly/dash/blob/master/dash/development/base_component.py