Automating Image Uploads Using Python and Selenium WebDriver

Automating Image Uploads Using Python and Selenium WebDriver

3 July 2024 Stephan Petzl Leave a comment QA

Automating image uploads can be a challenging task, especially when dealing with non-standard input elements such as Flash objects. This guide will walk you through a method to automate image uploads using Python and Selenium WebDriver by setting the value attribute of an element. This method circumvents the limitations posed by traditional approaches and provides a robust solution.

Problem Statement

The task is to automate the upload of an image to a server using a hidden input field. The input field in question is:

<input type="hidden" value="" name="allImages" id="allImages">

Initial attempts to set the value attribute directly using Python syntax were unsuccessful:

image = wd.find_element_by_id("allImages")
image.value = "http://optimusprime/uploads/b31f8a31-9d4e-49a6-b613-fb902de6a823.jpg"

Although the script runs without errors, the attribute value is not set.


To address this issue, we can use the execute_script method available in Selenium WebDriver. This method allows us to execute JavaScript code within the context of the browser, providing a way to set the attribute value indirectly.

Using JavaScript to Set the Attribute Value

The following JavaScript snippet can be used to set the value attribute of the hidden input field:

wd.execute_script("document.getElementById('allImages').value = '../uploads/b31f8a31-9d4e-49a6-b613-fb902de6a823.jpg';")

Alternatively, you can use the arguments array to pass the element reference directly:

image = wd.find_element_by_id("allImages")
wd.execute_script("arguments[0].value = 'foo.jpg';", image)

This approach has been recommended by various experts and is considered the best practice for this scenario.

Practical Example

Here is a complete Python script that demonstrates the solution:

from selenium import webdriver

# Initialize the WebDriver
wd = webdriver.Chrome()

# Open the target webpage

# Locate the hidden input field
image = wd.find_element_by_id("allImages")

# Set the value attribute using JavaScript
wd.execute_script("arguments[0].value = 'http://optimusprime/uploads/b31f8a31-9d4e-49a6-b613-fb902de6a823.jpg';", image)

# Additional code to submit the form or interact with the page
# ...

# Close the WebDriver


By using the execute_script method in Selenium WebDriver, you can effectively set the value attribute of input elements, even when they are hidden or part of complex structures like Flash objects. This approach ensures that your automation scripts are robust and reliable.

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