python - Bokeh:在散点图上使用框选择后如何更新数据表？

Question

当我在 Bokeh 散点图上使用框选择时，我尝试自动更新数据表。该表应显示所选框中的所有元素。

这适用于 Bokeh 版本 1.0.4。 Python 3.5 我尝试了多种方法来做到这一点，但还没有成功。

from random import random
from bokeh.models import CustomJS, ColumnDataSource, Row
from bokeh.plotting import figure, curdoc
from bokeh.models.widgets import Button, TableColumn, DataTable


x = [random() for x in range(500)]
y = [random() for y in range(500)]

s1 = ColumnDataSource(data=dict(x=x, y=y))
s2 = ColumnDataSource(data=dict(x=[], y=[]))
p1 = figure(plot_width=400, plot_height=400, tools="pan, wheel_zoom, lasso_select, box_zoom, reset", title="Select Here")
p1.circle('x', 'y', source=s1, alpha=0.6)
columns = [TableColumn(field ="x",  title = "X axis"),
           TableColumn(field ="y",  title = "Y axis")]

p2 = DataTable(source =s2, columns = columns, width =155, height = 380)

s1.selected.js_on_change('indices', CustomJS(args=dict(s1=s1, s2=s2, p2=p2), code="""
        var inds = cb_obj.indices;
        var d1 = s1.data;
        var d2 = s2.data;
        d2['x'] = []
        d2['y'] = []
        for (var i = 0; i < inds.length; i++) {
            d2['x'].push(d1['x'][inds[i]])
            d2['y'].push(d1['y'][inds[i]])
        }
        s2.change.emit();
        p2.change.emit();
    """)
)

def get_values():
    print(s2.data)

button = Button(label = "Get selected set")
button.on_click(get_values)

curdoc().add_root(Row(p1, p2, button))

当我选择散点图的一部分时，我希望更新数据表。 Image of Scatter Plot

Image of Data Table

Answer 1

如果我理解正确的话，我想我也遇到了同样的问题(see this post)。

解决方案可能是@Tony 提供的:

from random import random
from bokeh.models import CustomJS, ColumnDataSource, Row
from bokeh.plotting import figure, curdoc
from bokeh.models.widgets import Button

x = [random() for x in range(500)]
y = [random() for y in range(500)]

s1 = ColumnDataSource(data = dict(x = x, y = y))
p1 = figure(plot_width = 400, plot_height = 400, tools = "lasso_select", title = "Select Here")
p1.circle('x', 'y', source = s1, alpha = 0.6)

s2 = ColumnDataSource(data = dict(x = [], y = []))
p2 = figure(plot_width = 400, plot_height = 400, x_range = (0, 1), y_range = (0, 1), tools = "", title = "Watch Here")
p2.circle('x', 'y', source = s2, alpha = 0.6)

s1.selected.js_on_change('indices', CustomJS(args = dict(s1 = s1, s2 = s2), code = """
        var inds = cb_obj.indices;
        var d1 = s1.data;
        d2 = {'x': [], 'y': []}
        for (var i = 0; i < inds.length; i++) {
            d2['x'].push(d1['x'][inds[i]])
            d2['y'].push(d1['y'][inds[i]])
        }
        s2.data = d2  """))

def get_values():
    print(s2.data)

button = Button(label = "Get selected set")
button.on_click(get_values)

curdoc().add_root(Row(p1, p2, button))