散景：滑块未更新 Hbar 图上的结果

Question

我编写了以下代码，使用滑块过滤和更新 Bokeh 中 Hbar 图上的值。情节（如图所示）输出正确，但当我移动滑块时没有任何反应。如果有任何反馈，我将不胜感激。

import pandas as pd
from bokeh.core.properties import value
from IPython.display import display, HTML
from bokeh.plotting import figure, show
from bokeh.layouts import row, column, gridplot
from bokeh.io import output_notebook, save, curdoc
from bokeh.models import ColumnDataSource, HoverTool, DatetimeTickFormatter, FactorRange, DataTable, TableColumn, DateFormatter
from bokeh.models.widgets import Panel, Tabs, Slider
import matplotlib.pyplot as plt

xls=pd.ExcelFile(path)
test_data=pd.read_excel(xls, 'test_data')

display(test_data)

AREA    counts
A   500
B   100
C   70
D   50
E   40
F   20
G   10
H   2

def myplot(doc):

    source = ColumnDataSource(pd.DataFrame(data=test_data))
    area_list=source.data['AREA'].tolist()[::-1]

# Creating the Bar Chart

    p = figure(y_range=area_list ,plot_height=500, plot_width=500, title="Total counts per area",
           x_axis_label='counts', y_axis_label='AREA')
           

    p.hbar(y='AREA', right='counts',  height=1, 
            line_color="black", fill_color='red',line_width=1, 
            source=source)

    def update_plot(attr, old, new):

        Number_of_counts = slider.value
        new_data = test_data.loc[test_data['counts'] >=Number_of_counts]
        source = ColumnDataSource(data=new_data)


# Make a slider object: slider
    slider = Slider(start=1, end=100, step=1, value=1, title='counts')

# Attach the callback to the 'value' property of slider
    slider.on_change('value', update_plot)
 
    doc.add_root(column(slider, p))


show(myplot)

Answer 1

您正在替换 source 变量的值，但旧源仍然存在，被所有创建的模型使用。

尝试重新分配旧源的 data 属性，而不是重新创建源：

# source = ColumnDataSource(data=new_data)
source.data = ColumnDataSource.from_df(new_data)

散景：滑块未更新 Hbar 图上的结果

Bokeh: Slider is not updating results on Hbar plot

widget

slider

bokeh