Select and deselect checklist with button

@Andahay wrote:

I want to make a button for selecting and deselctin all the parameter in checklist. I have a problem with output type of my callback function.

output('checklist1', 'value')
...
if n_clicks % 2 = 0:
     out_state=['1','2','3']
else:
     out_state=[]
return{
       out_state
}

I can’t find how to send properties correctly, help me please

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