Window handles in Selenium Python

Introduction

Window handles help you switch between different browser windows or tabs during automated tests.

When your test opens a new browser tab or window and you need to interact with it.

When you want to verify content in a popup window.

When you need to close a child window and return to the main window.

When testing multi-window workflows like login popups or external links.

When handling alerts or dialogs that open in new windows.

Syntax

Selenium Python

driver.window_handles
# Returns a list of all open window handles

driver.current_window_handle
# Returns the handle of the current window

driver.switch_to.window(window_handle)
# Switches control to the specified window

Window handles are unique IDs for each open browser window or tab.

You must switch to the desired window before interacting with elements inside it.

Examples

Gets all open window handles and prints them as a list.

Selenium Python

handles = driver.window_handles
print(handles)

Stores and prints the handle of the current (main) window.

Selenium Python

main_window = driver.current_window_handle
print(main_window)

Switches control to the second window opened (index 1).

Selenium Python

driver.switch_to.window(handles[1])

Sample Program

This script opens a webpage with a button that opens a new window. It clicks the button, switches to the new window, prints its title, closes it, then switches back to the main window and prints its title again.

Selenium Python

from selenium import webdriver
from selenium.webdriver.common.by import By
import time

# Setup driver
driver = webdriver.Chrome()
driver.get('https://www.w3schools.com/jsref/tryit.asp?filename=tryjsref_win_open')

# Click button to open new window
iframe = driver.find_element(By.ID, 'iframeResult')
driver.switch_to.frame(iframe)
driver.find_element(By.TAG_NAME, 'button').click()

# Get window handles
handles = driver.window_handles
print(f"All window handles: {handles}")

# Switch to new window
main_window = driver.current_window_handle
driver.switch_to.window(handles[1])
print(f"Switched to new window title: {driver.title}")

# Close new window
driver.close()

# Switch back to main window
driver.switch_to.window(main_window)
print(f"Back to main window title: {driver.title}")

driver.quit()

Important Notes

Window handles are strings and unique per browser session.

Always switch back to the main window after closing child windows to avoid errors.

Use explicit waits if the new window takes time to load before switching.

Summary

Window handles let you control multiple browser windows or tabs in Selenium.

You get all handles with driver.window_handles and switch with driver.switch_to.window().

Switching windows is essential to interact with elements in popups or new tabs.

Practice

1. What does driver.window_handles return in Selenium?

easy

A. The size of the browser window

B. The title of the current browser window

C. The URL of the current page

D. A list of all open browser window handles

Solution

1. Step 1: Understand the purpose of driver.window_handles

   This command returns all the unique IDs (handles) of open browser windows or tabs controlled by Selenium.

2. Step 2: Differentiate from other window properties

   It does not return titles, URLs, or sizes, only handles to switch between windows.

3. Final Answer:

   A list of all open browser window handles -> Option D

4. Quick Check:

   window_handles = list of handles [OK]

Hint: window_handles gives all open windows as a list [OK]

Common Mistakes:

• Confusing window_handles with current window title
• Expecting a single handle instead of a list
• Using window_handles to get URL or size

2. Which of the following is the correct syntax to switch to a new window using Selenium in Python?

easy

A. driver.switch.window(new_window_handle)

B. driver.switch_to.window(new_window_handle)

C. driver.switchTo().window(new_window_handle)

D. driver.switch_window(new_window_handle)

Solution

1. Step 1: Recall Selenium Python syntax for switching windows

   The correct method is driver.switch_to.window(handle) to switch context to the window with the given handle.

2. Step 2: Identify incorrect syntax options

   Options B, C, and D use incorrect method names or Java-like syntax not valid in Python Selenium.

3. Final Answer:

   driver.switch_to.window(new_window_handle) -> Option B

4. Quick Check:

   Use switch_to.window() in Python Selenium [OK]

Hint: Use driver.switch_to.window(handle) to switch windows [OK]

Common Mistakes:

• Using Java syntax like switchTo() in Python
• Missing '_to' in switch_to
• Using non-existent methods like switch_window

3. Given the following code snippet, what will be printed?

original_handle = driver.current_window_handle
all_handles = driver.window_handles
for handle in all_handles:
    if handle != original_handle:
        driver.switch_to.window(handle)
        print(driver.title)
        break

medium

A. The title of the original window

B. No output because loop never runs

C. The title of the new window (not original)

D. An error because of wrong handle usage

Solution

1. Step 1: Understand the code logic

   The code saves the original window handle, then loops through all handles. It switches to the first handle that is not the original.

2. Step 2: Determine what is printed

   After switching, it prints the title of the new window and breaks the loop, so it prints the new window's title.

3. Final Answer:

   The title of the new window (not original) -> Option C

4. Quick Check:

   Switch to non-original window, print title [OK]

Hint: Switch to non-original handle to get new window title [OK]

Common Mistakes:

• Expecting original window title to print
• Confusing current_window_handle with window_handles
• Thinking loop does not run

4. What is wrong with this code snippet for switching to a new window?

new_window = driver.window_handles[1]
driver.switch_to.window(new_window)
driver.close()

medium

A. Index 1 may not exist if only one window is open

B. switch_to.window() is not a valid method

C. It closes the new window instead of switching back

D. driver.close() closes all windows

Solution

1. Step 1: Analyze window_handles indexing

   Accessing index 1 assumes there are at least two windows open. If only one window exists, index 1 causes an IndexError.

2. Step 2: Check other statements

   switch_to.window() is valid, driver.close() closes only current window, so no issue there.

3. Final Answer:

   Index 1 may not exist if only one window is open -> Option A

4. Quick Check:

   Check window_handles length before indexing [OK]

Hint: Always check window_handles length before indexing [OK]

Common Mistakes:

• Assuming multiple windows always exist
• Thinking driver.close() closes all windows
• Confusing method names

5. You open a new tab in Selenium and want to switch to it, but you don't know its handle. Which code snippet correctly switches to the new tab?

hard

A. new_handle = [h for h in driver.window_handles if h != driver.current_window_handle][0]
driver.switch_to.window(new_handle)

B. driver.switch_to.window(driver.current_window_handle + 1)

C. driver.switch_to.window(driver.window_handles[-1])

D. driver.switch_to.window(driver.window_handles[0])

Solution

1. Step 1: Understand the problem

   You want to switch to the new tab but only know the current window handle, not the new one.

2. Step 2: Analyze each option

   new_handle = [h for h in driver.window_handles if h != driver.current_window_handle][0] driver.switch_to.window(new_handle) finds the handle that is not the current one and switches to it correctly.
   driver.switch_to.window(driver.current_window_handle + 1) tries to add 1 to a string handle, causing error.
   driver.switch_to.window(driver.window_handles[-1]) switches to the last handle, which may work but is unsafe if multiple windows exist.
   driver.switch_to.window(driver.window_handles[0]) switches back to the original window, not the new tab.

3. Final Answer:

   Use list comprehension to find new handle and switch -> Option A

4. Quick Check:

   Find new handle by exclusion, then switch [OK]

Hint: Find new handle by excluding current, then switch [OK]

Common Mistakes:

• Adding 1 to a string handle (invalid)
• Assuming last handle is always new
• Switching to original window by mistake