Widget text not getting synchronized value

Hi, I tried to get fresh text.value after submitting…but it seems to give out old values (submitted previously or empty string)

text = widgets.Text()
display(text)

def handle_submit(sender):
    print(text.value)
    
text.on_submit(handle_submit)

I actually follow the example from this website, and expect to have similar effect…

I installed ipywidgets through conda today (tried to pip install / install from git but failed, possibly because of some broken conda settings on my desktop…)

Just want to know if there’s a way to get synchronized text widget value ? Also, it seems that the on_submit event is outdated? Is there a better way to achieve the same submitting event?

[jasongrout]

The recommended way to do this is to do something like:

import ipywidgets as widgets
from IPython.display import display

# You could also pass in continuous_update=False to only send 
# the new value when pressing enter or leaving the textbox
t = widgets.Text()

def value_changed(change):
    # change.new contains the new value
    print('new value: ' + change.new)

# call the value_changed function when t.value changes
t.observe(value_changed, 'value')

display(t)

[rpedsel]

Thanks for your recommendation! I tried to apply observe function before, but nothing happened after I click enter. It turns out that I need to click ctrl + enter to submit the text. Also, lots of thanks to ipywidgets developers! I am bad at web dev and this tool really helps me a lot to deliver a simple UI easily 👍