Table + Selection1D + gridmatrix?

HoloViews
#1

Hello, The following code:

import holoviews as hv
from holoviews import opts
from bokeh.sampledata.iris import flowers
from holoviews.operation import gridmatrix
hv.extension('bokeh')

iris_ds = hv.Dataset(flowers)

table = hv.Table(flowers)

sel1 = hv.streams.Selection1D(source=table)

table

grid = gridmatrix(iris_ds, diagonal_type=hv.Distribution, chart_type=hv.Points)

layout = (grid + table).opts(
    opts.Layout(merge_tools=True, shared_datasource=True),
    opts.GridMatrix(shared_datasource=True),
    opts.Points(shared_datasource=True, tools=['box_select']))

sel2 = hv.streams.Selection1D(source=table)

layout

If the first 2 cells are executed and a selection on table is performed, sel1 as expected returns the selected index or indices. If the third cell is executed, and a selection in one of the gridmatrix’s plots is performed, sel2 doesn’t return any index or indices.

How can I have sel2 return data?

Table + link_selections + gridmatrix?
#2

I’m not quite following here; the source for sel2 isn’t the gridmatrix, it’s the table, so it wouldn’t be affected by making a selection on the gridmatrix. Are you asking how to set up a selection where the source is the gridmatrix?

#3

… so it wouldn’t be affected by making a selection on the gridmatrix …

If that is true, and to answer your question, yes.

Perhaps accessing one of the gridmatrix’s underlying bokeh plot will yield what is selected?

#4

I’m confused. In your code, the selection works fine on the standalone table. It also works fine when the table is alongside a GridMatrix in a Layout, as long as shared_datasource=False. But once shared_datasource=True, Selection1D(source=table) doesn’t ever contain anything, nor does Selection1D(source=grid), whether I’m selecting on the grid or the table. Somehow the grid is interfering with Selection1D? Maybe @philippjfr can explain.

#5

That’s consistent with my experiences too. It seems that the issue resides somewhere in GridMatrix.

Thanks for looking into this!