Changing Categorical Axis

cat_axis_change.py

## Works in Bokeh 0.5.2
 
from __future__ import print_function
 
import time
import webbrowser
 
import requests
from requests.exceptions import ConnectionError
 
from bokeh.widgetobjects import Select, HBox, VBox
from bokeh.glyphs import Line, Rect
from bokeh.document import Document
from bokeh.session import Session

import bokeh.plotting as bkp
 
document = Document()
session = Session()
session.use_doc('test')
session.load_document(document)
 
factors = ['a','b','c']
 
 
plot = bkp.rect(x=factors, y=[1,2,3],
                    width=0.9, height=1, x_range=factors, fill_color="#3B8686")
 
 
def update_data():
    plot.x_range.factors = ['a','b','c','d'] 
    session.store_document(document)
    print('updated')
 
def on_widget_change(obj, attr, old, new):
    update_data()
 
def layout():
    select = Select(title="Date:", value="World", options=['option1','option2'])
    select.on_change('value', on_widget_change)
 
    controls = HBox(children=[select])
    layout = VBox(children=[controls, plot])
 
    return layout
 
document.add(layout())
 
if __name__ == "__main__":
    link = session.object_link(document._plotcontext)
    print("Please visit %s to see the plots" % link)
    session.store_document(document)
 
    try:
        while True:
            session.load_document(document)
            time.sleep(0.5)
    except KeyboardInterrupt:
        print()
    except ConnectionError:
        print("Connection to bokeh-server was terminated")