Python: how to make multiple selection in bokeh?

Question

I would like to choose a subsection from a selection.

I have a dataframe like the following.

df = pd.DataFrame()
df['People'] = ['Eva', 'John', 'Paul','Mr a', 'Miss b', 'Mrs c' ]
df['Type']   = ['Students', 'Students', 'Students', 'Teachers', 'Teachers', 'Teachers']

Let say we have Student and Teachers.

select  =  Select(title="People",  options=['Student', 'Teachers' ])

Then we have three students: Eva, John, Paul and three teachers Mr a, Miss b and Mrs c

How can we create a second selection select2 that choose Eva, John, Paul if we select teachers and Mr a, Miss b and Mrs c if we select Teachers.

select2  =  Select(title="Selected",  options=[ (`Eva`, `John`, `Paul`), (Mr a`, `Miss b`, `Mrs c`)] ])

This what I have in mind

select_data = Select(title="Type",  options=['None', 'Students', 'Teachers' ], value = '')
dynamic_select = Select(title = 'People', value = ''  , 
                        options = ['None','Eva', 'John', 'Paul','Mr a', 'Miss b', 'Mrs c' ] )
controls = widgetbox(select_data, dynamic_select)
layout = column(row(controls))

def update_layout(attr, old, new):
        if select_data.value == 'Students':
            dynamic_select = Select(title = 'People', value = '', options = ['Eva', 'John', 'Paul'])
        if select_data.value == 'Teachers':
            dynamic_select = Select(title = 'People', value = '', options = ['Mr a', 'Miss b', 'Mrs c'])
        if select_data.value == 'None':
            dynamic_select = Select(title = 'People', value = '', options = ['None'])     


select_data.on_change('value', update_layout)
dynamic_select.on_change('value', update_layout)
curdoc().add_root(layout)

Tony · Accepted Answer · 2019-05-22 14:37:40Z

3

With this code you can dynamically add / remove a second Select widget. Is this what you wanted?

from bokeh.plotting import curdoc, show
from bokeh.models import Select, Column, Div
from datetime import datetime, timedelta
import numpy as np

students = ['Eva', 'John', 'Paul']
teachers = ['Mr a', 'Miss b', 'Mrs c']
select_data = Select(title="People",  options=['', 'Students', 'Teachers' ], value = '')
layout = Column(select_data)

def update_layout(attr, old, new):
    if new:
        if len(layout.children) > 1 and layout.children[len(layout.children) - 1].title != new:
            layout.children.remove(layout.children[len(layout.children) - 1])

        options = students if new == 'Students' else teachers
        dynamic_select = Select(title = '{}'.format(new), value = '', options = options)
        layout.children.append(dynamic_select)

select_data.on_change('value', update_layout)
curdoc().add_root(layout)

edited May 22, 2019 at 14:37

answered May 22, 2019 at 14:30

Tony

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8 Comments

emax Over a year ago

thanks for the answer. I added a couple of comments to that. Because in my real case I have a dataframe with multiple cases. I just wrote that example that was simple. I modified the question with a dataframe. I am wondering how can I do that in this case.

emax Over a year ago

is it possible to do a similar menu without making widgets appearing and disappearing?

Tony Over a year ago

Do you mean to add permanently a new widget each time when you make a selection in the first one? Then just remove the line containing layout.children.remove and the proceeding if statement.

emax Over a year ago

I would like to have a fixed widget that changes only the options.

Tony Over a year ago

Then you just assign a new list to the options property of a Select widget: select.options = ['cats','dogs']

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