How to add widgets to container widget in ipython/jupyter

问题

I am trying to make VBox widget and and add a new row with text when button is clicked.

I try the following code

import ipywidgets as wg
from ipywidgets import Layout
from IPython.display import display

vb = wg.VBox([wg.Text('1'),wg.Text('2')])
btn = wg.Button(description = 'Add') 

def on_bttn_clicked(b):        
    vb.children=tuple(list(vb.children).append(wg.Text('3'))) 

btn.on_click(on_bttn_clicked)
display(vb, btn)

list(hb.children)

But the assignment "hb.children=" does not work... Is there a way to edit container widgets with code in the same cell?

回答1:

You can use a simple plus to concatenate two lists.

vb.children=tuple(list(vb.children) + [new_button])

So your full script will look like this:

import ipywidgets as wg
from ipywidgets import Layout
from IPython.display import display

vb = wg.VBox([wg.Text('1'),wg.Text('2')])
btn = wg.Button(description = 'Add') 

def on_bttn_clicked(b):        
    vb.children=tuple(list(vb.children) + [wg.Text('3')]) 

btn.on_click(on_bttn_clicked)
display(vb, btn)

list(vb.children)

来源：https://stackoverflow.com/questions/44986451/how-to-add-widgets-to-container-widget-in-ipython-jupyter