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javascriptpythonbokehinteractive

How to get mouse position with bokeh server?

I want to get the mouse position in a plot via a callback function using bokeh server. A solution for the latest bokeh version 2.0.2 would be great.

So far I found this old solution which does not work any more due to deprecation of the tool_events attribute in the figure object.

I have found this javascript example which does not work for the boekh server context.

Has someone an idea how to achieve this with bokeh?

Solution

  • If you want to get mouse position after every move, regardless of whether the cursor is over any glyph, you can just listen to the mousemove event:

    from bokeh.events import PointEvent
from bokeh.io import curdoc
from bokeh.plotting import figure

p = figure()
p.circle(0, 0)


def on_mouse_move(event: PointEvent):
    print(event.x, event.y, event.sx, event.sy)


p.on_event('mousemove', on_mouse_move)

curdoc().add_root(p)

    Also mouseenter and mouseleave may be of interest to you.