How to send extra **Kwargs to event click method of an ipyvuetify button-CodePudding

I am using ipyvuetify to create a dashboard including several buttons.

here the code for one of them:

import ipyvuetify as vue
from ipywidgets import Output

out = Output()
mybtn = vue.Btn(color='primary', children=['Run'])

def btn_method(widget, event, data):
    with out:
        print('btn was clicked')
          
mybtn.on_event('click', btn_method)

display(mybtn,out)

My problem is that when clicking a button the actions carried out depend on some varaibles. The question is how can I send to the button extra data, i.e. a dictionary of data.

Pseudo code:

import ipyvuetify as vue
from ipywidgets import Output
out = Output()
mybtn = vue.Btn(color='primary', children=['Run'])
# t followoing does not work, nor it gives an error:
def btn_method(widget, event, data, **kwargs):
    with out:
        print('btn was clicked')
        print(len(kwargs))
    if myvar==4:
        #do this
        pass
    else:
        #do that
        pass
             
mybtn.on_event('click', btn_method, kwargs={'myvar':4})

display(mybtn,out)

Of course the error is: on_event() got an unexpected keyword argument 'kwargs', i.e. you are not supposed to send other vars into the on_event method.

Any idea how to proceed?

thanks

CodePudding user response：

you can simply set your dictionary as an additional attribute of the button object and read it inside the callback function.

mybtn = vue.Btn(color='primary', children=['Run'])

def btn_method(widget, event, data):
    with out:
        print('btn was clicked')
        print(widget.kwargs)
    if widget.kwargs['myvar']==4:
        #do this
        pass
    else:
        #do that
        pass
             
mybtn.on_event('click', btn_method)
mybtn.kwargs={'myvar':4}

CodePudding user response：

One possibility is to use functools.partial to make a new callback function on-the-fly, that would have the extra args you want to pass already defined:

import functools

def btn_method(widget, event, data, **kwargs):
    with out:
        print('btn was clicked')
        print(len(kwargs))
    if kwargs.get("myvar")==4:
        #do this
        pass
    else:
        #do that
        pass
             
mybtn.on_event('click', functools.partial(btn_method, myvar=4))

(untested code)