Archived discussions · Captured October 28, 2026

hover tool not showing up in dashboard example?

Jan_GirlichOct 12, 2016 #1

Hi,

I'm having a look at the dashboard example in the datashader package. In
the code of dashboard.py at around line 290 there's a method
update_hover which seems to properly take care of adding a hover layer.
When I load the nyc taxi example like this:

python dasboard.py -c nyc_taxi.yml

the hover tool is shown in the tool list on the right hand side. I can
uncheck and check the checkbox inside it, but there is nothing showing
up, when I move my mouse over any datapoint.

Am I missing something about how the hover_tool is supposed to work?

It works fine for me, when I run hover_layer.ipynb from the bokeh
examples in the same virtual environment.

Cheers
Jan

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James_A_Bednar1Oct 12, 2016 #2

Hi Jan! Thanks for your bug report. Datashader is managed separately from bokeh, and uses github issues to manage questions like this, so could you please file an issue at https://github.com/bokeh/datashader/issues listing your bokeh and datashader versions? It doesn’t sound like hover is working as it should for you.

···

On Wed, Oct 12, 2016 at 6:28 AM, Jan Girlich jan.girlich@modzero.ch wrote:

Hi,

I’m having a look at the dashboard example in the datashader package. In

the code of dashboard.py at around line 290 there’s a method

update_hover which seems to properly take care of adding a hover layer.

When I load the nyc taxi example like this:

python dasboard.py -c nyc_taxi.yml

the hover tool is shown in the tool list on the right hand side. I can

uncheck and check the checkbox inside it, but there is nothing showing

up, when I move my mouse over any datapoint.

Am I missing something about how the hover_tool is supposed to work?

It works fine for me, when I run hover_layer.ipynb from the bokeh

examples in the same virtual environment.

Cheers

Jan

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Jim

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Jan_GirlichOct 12, 2016 #3

Hi James,

···

Am 12.10.2016 um 14:36 schrieb James Bednar:

Hi Jan! Thanks for your bug report. Datashader is managed separately from
bokeh, and uses github issues to manage questions like this, so could you
please file an issue at Issues · holoviz/datashader · GitHub listing
your bokeh and datashader versions? It doesn't sound like hover is working
as it should for you.

I created an issue here: Hover not showing up in dashboard.py nyc taxi example · Issue #252 · holoviz/datashader · GitHub

But as far as I understand the hover tool in datashader is entirely
covered by the bokeh part, isn't it?

Cheers
Jan

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James_A_Bednar1Oct 12, 2016 #4

Thanks! Datashader hovering is implemented using Bokeh, but the code for it is part of the datashader repo because it is specific to datashader (the data has to be re-aggregated to allow hovering). I’ll respond to the issue over there.

···

On Wed, Oct 12, 2016 at 10:52 AM, Jan Girlich jan.girlich@modzero.ch wrote:

Hi James,

Am 12.10.2016 um 14:36 schrieb James Bednar:

Hi Jan! Thanks for your bug report. Datashader is managed separately from

bokeh, and uses github issues to manage questions like this, so could you

please file an issue at https://github.com/bokeh/datashader/issues listing

your bokeh and datashader versions? It doesn’t sound like hover is working

as it should for you.

I created an issue here: https://github.com/bokeh/datashader/issues/252

But as far as I understand the hover tool in datashader is entirely

covered by the bokeh part, isn’t it?

Cheers

Jan

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For more options, visit https://groups.google.com/a/continuum.io/d/optout.

Jim

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Jan_GirlichOct 19, 2016 #5

Hi Jim,

Thanks! Datashader hovering is implemented using Bokeh, but the code for
it is part of the datashader repo because it is specific to datashader (the
data has to be re-aggregated to allow hovering). I'll respond to the issue
over there.

don't mean to rush you, but I need to get this to work. Maybe you can
tell me how I can help to debug this. I'm an experienced developer
(backend, not web), but I don't know the codebase of datashader and
where to start looking to debug this. So it would speed me up a lot if
you could tell me a few words about where to start looking at this.

Cheers
Jan

···

Am 12.10.2016 um 18:26 schrieb James Bednar:

Jim

On Wed, Oct 12, 2016 at 10:52 AM, Jan Girlich <jan.girlich@modzero.ch> > wrote:

Hi James,

Am 12.10.2016 um 14:36 schrieb James Bednar:

Hi Jan! Thanks for your bug report. Datashader is managed separately

from

bokeh, and uses github issues to manage questions like this, so could you
please file an issue at Issues · holoviz/datashader · GitHub

listing

your bokeh and datashader versions? It doesn't sound like hover is

working

as it should for you.

I created an issue here: Hover not showing up in dashboard.py nyc taxi example · Issue #252 · holoviz/datashader · GitHub

But as far as I understand the hover tool in datashader is entirely
covered by the bokeh part, isn't it?

Cheers
Jan

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systemJul 21, 2021 #6

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