updating one widget value by the influence of another

[Malitha Kabir]

Hi,
I am facing trouble with updating widget value. Any help is highly appreciated.

Here is relevant details:
I have two widgets (one dropdown and another html text). My uses will change the value from dropdown and will expect to see the effect in html text.
Additional note 1 : my current development uses interact() function. It will be great help if you enable me to persist the current structure.
Additional note 2 : I need to make sure that the development is fit for both python 2 and 3.

Here is the relevant architecture:

from __future__ import print_function
from ipywidgets import interact, interactive, fixed, interact_manual
import ipywidgets as widgets

def coreCalculationFunction(wantToUpdateIt,myOptions):

if myOptions is 'a':
wantToUpdateIt='first alphabet in english'
elif myOptions is 'b':
wantToUpdateIt='second alphabet in english'
else:
wantToUpdateIt='anything else here!'

return myOptions

def optionsRelatedFunction():
myOptions=['a', 'b', 'c']
wantToUpdateIt=widgets.HTML(value="Hello World")
res=interact(coreCalculationFunction,
wantToUpdateIt=wantToUpdateIt,
myOptions=myOptions);
return res

optionsRelatedFunction()

Thank you very much for your kind help.

Best regards,
Malitha Humayun Kabir

[MinRK]

You can use traitlets.link to connect two values together.

from IPython.display import display
import ipywidgets as W
from traitlets import link

def coreCalculationFunction(myOptions):

    return myOptions

def optionsRelatedFunction():
    myOptions=['a', 'b', 'c'

]
    label = W.HTML(value="Hello World")
    the_interact = W.interactive(coreCalculationFunction,
                 myOptions=myOptions)
    dropdown = the_interact.children[0]

    # link ensures that when dropdown.value changes,
    # label.value gets the same value, and vice versa.
    # dlink is a unidirectional alternative.
    link((dropdown, 'value'),
         (label, 'value'),
    )
    display(label, the_interact)

optionsRelatedFunction()

-MinRK

​

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