Reset Dropdown default values

[gaurav13]

hi Team,

Could you please help - I was trying to empty the selection in dropdown (planning to do this for multiple dropdowns) values at a button click but this does’t seems to be working.

Reset Filter values

@app.callback(dash.dependencies.Output(‘filterByN1’, ‘value’),
[dash.dependencies.Input(‘resetButton’, ‘n_clicks’)])
def on_click(n_clicks):
if (n_clicks):
return {‘value’:None}

Above snippet is replacing all selected values within a dropdown to Nan value as displayed in above image.

regards,

[chriddyp]

@gaurav13

return {‘value’:None}

This isn’t the right Dash syntax. Where did you find this example? (Just so that we’re not misdocumenting this anywhere!). It should just be return None

[gaurav13]

Don’t have the reference link now but have seen this in some of the examples in forum.

[chriddyp]

OK. If you can find out where, please let us know. We don’t want things to be misdocumented!