Bokeh is a powerful Python library for interactive plotting and data visualization. It provides an easy-to-use interface for creating dynamic visualizations on the web. In this blog post, we will explore how to create sliders and dropdown menus using Bokeh.

Installing Bokeh

Before we start, make sure you have Bokeh installed. You can install it using pip:

pip install bokeh

Creating a Slider

A slider is a useful tool for allowing users to interactively adjust a value within a specified range. To create a slider with Bokeh, follow these simple steps:

1. Import the necessary Bokeh modules:

from bokeh.io import output_file, show
from bokeh.models import Slider
from bokeh.layouts import column

1. Create sliders based on your desired parameters. For example, to create a slider that ranges from 0 to 100 with an initial value of 50, use the following code:

slider = Slider(start=0, end=100, value=50, step=1, title="Slider")

1. Construct the layout and display the slider:

layout = column(slider)
output_file('slider.html')
show(layout)

Creating a Dropdown Menu

A dropdown menu provides a list of options for users to choose from. With Bokeh, you can easily create a dropdown menu using the Select widget. Here’s how to do it:

1. Import the necessary modules:

from bokeh.models import Select
from bokeh.layouts import column

1. Create a list of options for the dropdown menu:

options = ['Option 1', 'Option 2', 'Option 3']

1. Create the dropdown menu widget:

dropdown = Select(title="Dropdown", options=options, value=options[0])

1. Construct the layout and display the dropdown menu:

layout = column(dropdown)
output_file('dropdown.html')
show(layout)

Conclusion

Bokeh provides a simple and intuitive way to create sliders and dropdown menus for interactive visualizations. By incorporating these interactive elements, you can enhance the user experience and make your plots more engaging. Experiment with different options and settings to create dynamic and interactive visualizations using Bokeh!