How to set an action for any value selected in the filter dropdown?

Dash Python
1

Hello!

I’m trying to write an IF function that will trigger with any value of the dropdown.

This is the simplified code:

app.layout = html.Div(children=[
                dcc.Dropdown(id='dpdw_filter',  options=df['exam'].unique())])

@app.callback(
    Output(component_id='fig_line', component_property='figure'),
    Input(component_id='dpdw_filter', component_property='value'))

def update_plot(selection):
     if selection is None:
            chart = px.line(data_frame = another_df ....

So, selection is None work fine when nothing is selected in the dropdown, now I want to change this code to the exactly opposite. I want the action to be trigger by any value of the dropdown.

if selection == value should work? For now I’m not able to make it work

2

Hello @tex.y,

Normally something like this:

if selection:
    ### code
1 Like
3

@jinnyzor Sorry my friend, but I didn’t understand.

code is not the source of the data used in the dropdown.

I edited the code for better clearance!

4

Replace ### code with the code that you want to execute when the value is not blank. :slight_smile:

1 Like
5

@jinnyzor oh boy… Now I get it !!!

Wait a minute, I will try

6

you nailed it

sorry for the basic question

1 Like
7

Haha, no worries.

It does get a little more complex when getting into dataframes. :wink: :smiley:

2 Likes