circular updates on sliders

On Sep 15, 2016, at 6:52 PM, Glenn Vanbavinckhove <gvanbavi@gmail.com> wrote:

Hi,

Still learning bokeh. I run into an issue using sliders, which at the moment I am not sure what the correct way is to solve it.

Description:
I have multiple sliders. Some are dependent

Some example:
slider1.on_change('value',lambda attr, old, new:update())
slider2.on_change('value',lambda attr, old, new:update())

In my calculations:
val1=slider1.value

val2=slider2.value*val1**2
slider2.value=val2

When I slide slider 1 it will go in a loop, slider 2 will update which will trigger slider 1 again,...

I was looking in the documentation if there was a way to change the value of the slider but not trigger an on_change but couldn't find anything. Secondly, I was thinking of removing the on_change with remove_on_change and then add it afterwards again. Thirdly, I was thinking of using a blocking variable to be used inside the update function (if block is True ignore the calculation call)

What is in general a good approach to deal with this?

Thanks!

Best,

Glenn

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On Saturday, September 17, 2016 at 2:17:12 AM UTC+10, Bryan Van de ven wrote:

It’s hard to say without specifics. Why are you updating both sliders in one callback for both? I can imagine a scenario where a user setting a first slider might update a second one as a result, but I can’t imagine a situation where it would be useful for the second to also update the first (which is the problem). I guess the question is: what are you really, actually trying to accomplish (in plain language, without any mention of widgets or callbacks, or specific technology)

Thanks,

Bryan

On Sep 15, 2016, at 6:52 PM, Glenn Vanbavinckhove gvan...@gmail.com wrote:

Hi,

Still learning bokeh. I run into an issue using sliders, which at the moment I am not sure what the correct way is to solve it.

Description:

I have multiple sliders. Some are dependent

Some example:

slider1.on_change(‘value’,lambda attr, old, new:update())

slider2.on_change(‘value’,lambda attr, old, new:update())

In my calculations:

val1=slider1.value

val2=slider2.value*val1**2

slider2.value=val2

When I slide slider 1 it will go in a loop, slider 2 will update which will trigger slider 1 again,…

I was looking in the documentation if there was a way to change the value of the slider but not trigger an on_change but couldn’t find anything. Secondly, I was thinking of removing the on_change with remove_on_change and then add it afterwards again. Thirdly, I was thinking of using a blocking variable to be used inside the update function (if block is True ignore the calculation call)

What is in general a good approach to deal with this?

Thanks!

Best,

Glenn

–
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