用RangeSlider改变轴向范围

Question

我用bokeh创建了一个情节，现在尝试向它添加一些小部件。目前，我想用RangeSlider改变x轴，但是我想我在回调方面有一些问题。随函附上代码：

import pandas as pd
import numpy as np
import bokeh.plotting as bp
from bokeh.models import CustomJS
from bokeh.models.widgets import RangeSlider
from bokeh.layouts import row, widgetbox
from bokeh.plotting import figure, show, output_file


df = pd.DataFrame(np.random.randint(0,30,size=(100, 3)), columns=list('ABC'))
df.index.name ='Numbers'
dt = bp.ColumnDataSource(df)

output_file("Plot.html")

p = figure(title="Example", 
       x_axis_label = "Number", y_axis_label = "Temperature in C",
       x_range=(0,100))

p.line(source=dt, x='Numbers', y='A', color='blue', legend='Line A')
p.line(source=dt, x='Numbers', y='B', color='red', legend='Line B')
p.line(source=dt, x='Numbers', y='C', color='green', legend='Line C')
p.legend.click_policy="hide"

callback = CustomJS(args=dict(p=p), code="""
                      var a = cb_obj.value;
                      p.x_range = a;
                      p.change.emit();
                      """)

range_slider = RangeSlider(start=0, end=100,value=(2,75), step=1, title="Test")
range_slider.js_on_change('value', callback)


layout = row(p,widgetbox(range_slider))
show(layout)

提前感谢！

Answer 1

您必须分别在范围内设置start和end：

callback = CustomJS(args=dict(p=p), code="""
    var a = cb_obj.value;
    p.x_range.start = a[0];
    p.x_range.end = a[1];
""")

此外，对emit的调用也是不必要的。