python - Bokeh 小部件回调以选择所有复选框

Question

我在尝试设置 Bokeh CheckboxGroup 小部件时遇到了几个问题。 Checkbox 组本身很大(50 个状态)，我想将选择初始化为所有事件。

此外(更重要的是)由于该组旨在实现高度交互，因此我想添加“全选”和“全部清除”按钮。我知道我需要一些回调机制来执行此操作，但在搜索示例、文档和 stackoverflow 之后，我无法弄清楚具体方法。我在下面包含了我的代码的简化版本。我的偏好是使用标准的小部件回调而不是 JS 回调。

感谢任何帮助!

from bokeh.plotting import curdoc, output_file
from bokeh.models.widgets import Button, CheckboxGroup
from bokeh.layouts import widgetbox, row
from bokeh.models import ColumnDataSource, Callback 

output_file("states.html", title="states")

states = ["Alabama", "Alaska ", "Arizona", "Arkansas", "California", \
        "Colorado", "Connecticut", "Delaware", "Florida", "Georgia", \
        "Hawaii", "Idaho ", "Illinois", "Indiana", "Iowa", "Kansas", \
        "Kentucky", "Louisiana", "Maine", "Maryland", "Massachusetts", \
        "Michigan ", "Minnesota", "Mississippi", "Missouri", "Montana",\
        "Nebraska", "Nevada ", "New Hampshire", "New Jersey",\
        "New Mexico", "New York", "North Carolina", "North Dakota", \
        "Ohio", "Oklahoma","Oregon", "Pennsylvania", "Rhode Island", \
        "South Carolina", "South Dakota", "Tennessee", "Texas", "Utah",\
        "Vermont", "Virginia","Washington", "West Virginia", \
        "Wisconsin", "Wyoming"]

states = CheckboxGroup(
        labels = states,
        active=[0,1])

select_all = Button(label="select all")
# need some help here

group = widgetbox(select_all, states)

layout = row(group)

curdoc().add_root(layout)
curdoc().title = "states"

Answer 1

Bokeh服务器的基本功能是让所有的Bokeh对象在Python端和JS端保持同步。 CheckboxGroup 的active 属性指定始终选中哪些框，而不仅仅是初始化。所以要选中所有的框，你只需要在回调中适本地设置它:

from bokeh.plotting import curdoc, output_file
from bokeh.models.widgets import Button, CheckboxGroup
from bokeh.layouts import widgetbox, row
from bokeh.models import ColumnDataSource, Callback

output_file("states.html", title="states")

states_list = ["Alabama", "Alaska ", "Arizona", "Arkansas", "California", \
        "Colorado", "Connecticut", "Delaware", "Florida", "Georgia", \
        "Hawaii", "Idaho ", "Illinois", "Indiana", "Iowa", "Kansas", \
        "Kentucky", "Louisiana", "Maine", "Maryland", "Massachusetts", \
        "Michigan ", "Minnesota", "Mississippi", "Missouri", "Montana",\
        "Nebraska", "Nevada ", "New Hampshire", "New Jersey",\
        "New Mexico", "New York", "North Carolina", "North Dakota", \
        "Ohio", "Oklahoma","Oregon", "Pennsylvania", "Rhode Island", \
        "South Carolina", "South Dakota", "Tennessee", "Texas", "Utah",\
        "Vermont", "Virginia","Washington", "West Virginia", \
        "Wisconsin", "Wyoming"]

states = CheckboxGroup(
        labels = states_list,
        active=[0,1])

select_all = Button(label="select all")

def update():
    states.active = list(range(len(states_list)))
select_all.on_click(update)

group = widgetbox(select_all, states)

layout = row(group)

curdoc().add_root(layout)
curdoc().title = "states"