FactorRange doesn't update x-axis VBar Plot

Community Support
1

Hi,

I’m trying to update the x-axis factors of a VBar plot by changing the axis using FactorRange.

from bokeh.io import show, output_file, curdoc
from bokeh.models import ColumnDataSource
from bokeh.plotting import figure
from bokeh.models.widgets import Button
from bokeh.models.ranges import FactorRange
from bokeh.layouts import row,column


fruits = ['Apples', 'Pears', 'Nectarines', 'Plums', 'Grapes', 'Strawberries']
counts = [5, 3, 4, 2, 4, 6]

source = ColumnDataSource(data=dict(fruits=fruits, counts=counts))

p = figure(x_range=fruits, plot_height=350, toolbar_location='left', title="Fruit Counts", tools='wheel_zoom')
p.vbar(x='fruits', top='counts', width=0.9, source=source, legend_field="fruits",
       line_color='white', fill_color='dodgerblue')

p.xgrid.grid_line_color = None
p.legend.orientation = "horizontal"
p.legend.location = "top_center"

def plot_change():
    fruits = ['Banana', 'Orange']
    counts = [41, 12]
    source.data = dict(fruits=fruits, counts=counts)
    p.x_range = FactorRange(fruits)

button_classify = Button(label="Change Vbar")
button_classify.on_click(plot_change)

layout = column(button_classify, p)
curdoc().add_root(layout)
curdoc().title = "VBar"

When you click the button to change the x-axis ranges, plot becomes blank.

image
image1104×742 31.7 KB

After clicking the button, this is what happens:

image
image1104×742 17.4 KB

Any feedback to solve this? Is it not possible to change the axis factors if it’s categorical?

2

Solved it.

Changing p.x_range = FactorRange(fruits) to p.x_range.factors = fruits solves it.

1 Like
3

This is a special case of the general, always-applicable, best-practice advice for Bokeh:

Always make the smallest change possible

I.e., set a property on an object, don’t replace the entire object.

1 Like