ipywidgets: identify which widget is being observed

Question

I need to create a variable number of widgets and then identify which widget is being observed when the user interacts with one of them. In the following example, n IntSliders are being created:

import ipywidgets as wg
def obs(change):
    print(change)
def fun(n):
    l  = []
    for i in range(n):
        l.append(wg.IntSlider())
        l[i].observe(obs, names='value')
    display(wg.VBox(l))
fun(4)

When interacting with one of the sliders, the change variable only gives the values for owner, old, new, type and name.

{'owner': IntSlider(value=1), 'new': 1, 'old': 0, 'type': 'change', 'name': 'value'}

I would like to "tweak" the content of change to include its position in the list l.

Note: I cannot use existing IntSlider attributes like description because then it will be reflected in the widget appearance.

franpena franpena · Accepted Answer · 2018-07-07T15:56:33

1

votes

The solution is given in this issue.

ipywidgets: identify which widget is being observed

1 Answers