Archived discussions · Captured October 28, 2026

Bokeh Button Call-Back Question

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Griffith_ChenJul 29, 2018 #1

Hi All,

I’m new in Bokeh and I make some project with node analyzer for interesting. And I find this functionality as below,

https://demo.bokehplots.com/

I think that the slider with play button could make my project more easily to use, from slider side is work fine,

but when implement the play button function, I meet some trouble with call back function. I try some test,

found that there has no call-back trigger when I click the button, any wrong with my code as below?

Thank you very much.

Python 2.7.12

Bokeh Version: 0.12.14

----------- Testing Code-------------

button = Button(label=‘press me’)

def update():

global button

button.label = “Good”

print “Hi”

button.on_click(update)

show(widgetbox(button))

⌁ Link to post

BryanJul 29, 2018 #2

By calling show, you are creating a standalone HTML/JS document that is not connected to any persistent python process. So there is nothing to run your Python callback. Use of real python callbacks requires running on the Bokeh server (that is the purpose of the Bokeh server, to be the thing that runs real Python callbacks). You can find more information about the bokeh server here:

Bokeh server — Bokeh 3.3.2 Documentation

Thanks,

Bryan

···

On Jul 28, 2018, at 23:15, Griffith Chen <visittruth@gmail.com> wrote:

Hi All,

I'm new in Bokeh and I make some project with node analyzer for interesting. And I find this functionality as below,
https://demo.bokehplots.com/

I think that the slider with play button could make my project more easily to use, from slider side is work fine,
but when implement the play button function, I meet some trouble with call back function. I try some test,
found that there has no call-back trigger when I click the button, any wrong with my code as below?
Thank you very much.

Python 2.7.12
Bokeh Version: 0.12.14
----------- Testing Code---------- ---
button = Button(label='press me')
def update():
    global button
    button.label = "Good"
    print "Hi"
button.on_click(update)
show(widgetbox(button))

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