Trouble updating plot through callback

Hi, I’m fairly new to bokeh and I can see there are a lot of posts on this topic, but I’ve been googling this all weekend, without finding a solution, so I’ll try here:

I have some trouble implementing a RangeSlider and Select widget. They show up in the plot with their initial values, but nothing happens to the plot when click on them.

I can only assume this has to do with my callback methods, but I can’t see how they differ from the callback function in e.g. (the slider_update() - method). Here’s my bokeh script:

import pandas as pd

from import curdoc

from bokeh.models import ColumnDataSource, Slider, Select

from bokeh.plotting import figure

from bokeh.models.widgets import RangeSlider

from bokeh.layouts import column, row

df = pd.read_csv(“temperature.csv”, header=0)

source = ColumnDataSource(df)

months = df.columns.values.tolist()

plot = figure(plot_width=1000, plot_height=600)

plot.line(x=“Year”, y=“January”, source=source)

menu = Select(options=months, value=“June”, title=“Month”)

start, end = df[“Year”].iloc[0], df[“Year”].iloc[-1]

slider = RangeSlider(start=start, end=end, value=(start, end), step=1, title=“Year”)

def select_callback(attr, old, new): = df[menu.value]

menu.on_change(‘value’, select_callback)

def slider_callback(attr, old, new): = df.loc[slider.value[0] : slider.value[1], :]

slider.on_change(‘value’, slider_callback)

layout = column(plot, row(menu, slider))



I am trying to show this plot in the browser using Flask, with the app:

from flask import Flask, render_template

from bokeh.embed import autoload_server

app = Flask(name)


def index():

script = autoload_server(None, url=“http://localhost:5006/plot_script”)

return render_template(“temp.html”)

if name==“main”:, debug=True)


Both the Flask app and running with simply bokeh serve --show yield the same unresponsive graph.

The csv file has no issues, but there might be something wrong with the html template. Does anyone have any idea as to how to generate a template from the program? (See attchments)

temperature.csv (24.7 KB)

temp.html (36.5 KB)


Please disregard everything about Flask, that code is completely wrong, sorry!

Assume I’m running simply:

bokeh serve --show

The same problems with the plot not updating still holds. Any ideas?