Dropdown clears values on page refresh or tab switch when options are changed #2072
Description
Describe your context
python 3.10
dash 2.4.1 **2.3.1 does not show issue** dash-bootstrap-components 1.1.0 dash-core-components 2.0.0 dash-daq 0.5.0 dash-html-components 2.0.0 dash-table 5.0.0 Describe the bug
Dash dcc dropdown persistence clearing all values when updating options even if returning no_update on value of dropdown
Expected behavior
dash multi selection dropdown should keep values that are still available if options are changed.
I want the inputs to be kept if a tab is changed to and back or on a page refresh (therefore i'm using persistence type local)
another page determines what dropdown options are available on original page
Screenshots
example dropdown setup
layout with a dropdown
dcc.Dropdown( id='my-dropdown', options=[], value=None, persistence=True, persistence_type="local", multi=True ), @app.callback( [Output("my-dropdown", "options"), Output("my-dropdown", "value")], Input("url", "pathname"), [State("my-dropdown", "value")] ) def load_dropdown(pathname, dropdown_values): # some code here that determine what the dropdown options should be and if needed clear options that are no longer available