panel server failure about panel HOT 8 CLOSED

Before I try to debug this, this is the idiomatic way to write this:

class Selection(param.Parameterized):
    typ = param.ObjectSelector(default='curve', objects=['curve','scatter'])
    
    def callback(self, x, y):
        x = 0 if x is None else x
        y = 0 if y is None else y
        el = hv.Curve if self.typ == 'curve' else hv.Scatter
        h = el(((x,0),(y,1)))
        return h.redim.range(x=(-1,1), y=(-1,1)).relabel('{},{}'.format(x,y)).options(show_grid=True)

    @param.depends('typ')
    def view(self):
        return hv.DynamicMap(self.callback, streams=[SingleTap(transient=True)])

selection     = Selection(name="Ouch")
pn.Column( 'Click on the plot or change plot type', selection.param, selection.view)

from panel.

Thanks for migrating the issue @ea42gh.

from panel.

I modified
https://github.com/ea42gh/HoloviewsPlayground/blob/master/App_EulersMethod.ipynb
as suggested above.
The code works in the notebook as before.

Serving it, the app still breaks once the selector widget is used.
Clicking a legend now appears to call the callback twice,
with some sort of failure on the second time.

I still need to specify that I do not want a tap event when clicking a legend.
if x is not None and y is not None and x < 5.:
I'll go hunt for what else might be going on now...

from panel.

I still need to specify that I do not want a tap event when clicking a legend.

Mind filing another issue in holoviews about this, I hadn't though about the fact that on bokeh server these kinds of guards have to happen on the python end.

from panel.

Also, I can reproduce your issues. Glad I held back on tagging 0.2.

from panel.

Will do.
Figured out a little more:
clicking a legend to mute an element causes

• the plot to be redrawn with the element muted
• redrawing the plot with the element with the original alpha

from panel.

Makes sense, that should be fixed once we drop events outside the plot range on bokeh server.

from panel.

Closing since the remaining issues are in holoviews.

from panel.