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How to know the clicked button when we have multiple buttons.

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Roberto_Gonzalez_SanSep 23, 2016 #1

Hi all,

I have a figure that should be modified depending on the clicked button.

I’m generating the buttons like this:

def update(value):
print "pushed button ", value

for i, data in enumerate(personas_data):

button_persona = Button(label=data["title"], width = 210)

button_persona.on_click(lambda: update(i))

But, when I click a button, it always receive the index of the last one. So, I cannot know the button the user is clicking.
Is there an easy way to do this?

Thanks

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Roberto_Gonzalez_SanSep 23, 2016 #2

Just in case someone have my same problem, I solved it in a really non elegant way, but it works:

def update():
for i in xrange(len(buttons)):
if (buttonsStatus[i] < buttons[i].clicks): #Checking the button that has changed
print "pushed button ", i
buttonsStatus[i] = buttons[i].clicks
break;

buttons =

for i, data in enumerate(personas_data):

button_persona = Button(label=data["title"], width = 210, clicks = 0)

 button_persona.on_click(update)

buttons.append(button_persona)

buttonsStatus = np.zeros((len(buttons), 1))

···

El viernes, 23 de septiembre de 2016, 12:32:35 (UTC+2), Roberto González Sánchez escribió:

Hi all,

I have a figure that should be modified depending on the clicked button.

I’m generating the buttons like this:

def update(value):
print "pushed button ", value

for i, data in enumerate(personas_data):

button_persona = Button(label=data["title"], width = 210)

button_persona.on_click(lambda: update(i))

``

But, when I click a button, it always receive the index of the last one. So, I cannot know the button the user is clicking.
Is there an easy way to do this?

Thanks

⌁ Link to post

BryanSep 23, 2016 #3

This actually has nothing to do with Bokeh, it’s a particular example of scoping behavior in Python that is often surprising to people. See

http://stackoverflow.com/questions/1841268/generating-functions-inside-loop-with-lambda-expression-in-python

For more details and a solution.

Thanks,

Bryan

···

On Sep 23, 2016, at 05:32, Roberto González Sánchez robegs@gmail.com wrote:

Hi all,

I have a figure that should be modified depending on the clicked button.

I’m generating the buttons like this:

def update(value):
print "pushed button ", value

for i, data in enumerate(personas_data):

button_persona = Button(label=data["title"], width = 210)

button_persona.on_click(lambda: update(i))

``

But, when I click a button, it always receive the index of the last one. So, I cannot know the button the user is clicking.
Is there an easy way to do this?

Thanks

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systemJul 21, 2021 #4

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