How to Populate Values in a Readonly Input Field

What will you learn?

In this tutorial, you will discover how to populate values in a readonly input field using Python and Selenium. We will explore techniques to bypass restrictions imposed by readonly attributes on HTML elements and dynamically send desired values to these fields.

Introduction to the Problem and Solution

When faced with readonly input fields, directly manipulating their values can be challenging. However, by leveraging tools like Selenium and injecting JavaScript code into web pages, we can overcome this obstacle effectively.

To address this issue, we will combine Python with Selenium to interact with readonly input fields. By executing scripts through browser automation tools or injecting them into the HTML document, we can populate these fields dynamically.


# Importing necessary modules for web scraping with Selenium
from selenium import webdriver

# Initializing Chrome WebDriver
driver = webdriver.Chrome()

# Navigating to the target webpage

# Executing JavaScript code using Selenium to populate a readonly input field with id 'readonlyInput' 
driver.execute_script("document.getElementById('readonlyInput').value = 'Desired Value';")

# Closing the WebDriver session after use

# Copyright PHD

Explanation of the Code:

  1. Import essential modules for web scraping.
  2. Initialize a Chrome WebDriver instance.
  3. Direct the WebDriver to the target webpage.
  4. Use execute_script to inject custom JavaScript code setting a predefined value (‘Desired Value’) into an input field (with ID ‘readonlyInput’).
  5. Close the WebDriver session post-script execution.


By utilizing Selenium’s capability to execute JavaScript on websites, we can work around readonly attributes on HTML elements and interact dynamically with these fields. This approach enables us not only to read but also write data into such fields efficiently, combining Python with Selenium for seamless automation of web interactions.

Frequently Asked Questions

  1. How do I identify elements uniquely when using Selenium? In Selenium, locators like ID, Class Name, XPath can be used for unique element identification.

  2. Can I interact with iframes using Selenium? Yes! You can switch between frames using switch_to.frame() method in Selenium.

  3. Is it possible to handle pop-up windows through Selenium? Certainly! Alerts and pop-ups can be controlled via switch_to.alert methods in Selenium.

  4. Does headless browsing impact execution speed in automated tests? Headless browsers generally execute faster than their GUI counterparts due to reduced overhead related to rendering graphics.

  5. What role does geckodriver play while working with Firefox in Selenium? Geckodriver acts as an interface between Firefox browser & your Python script when running test cases involving Firefox through Selenium.

  6. Can I run my automated tests across different browsers simultaneously using Python and Selenium? Yes! Tools like Pytest coupled with pytest-selenium enable seamless cross-browser testing workflows.


In conclusion, mastering Python along with libraries like BeautifulSoup or leveraging tools such as Scrapy for web scraping tasks provides immense flexibility when dealing with challenges like interacting with readonly input fields on websites. By adopting these solutions strategically in your projects, you can enhance data extraction processes efficiently.


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