Window management (maximize, size) in Selenium Java

Introduction

We use window management to control the browser size during tests. This helps us see the web page as a user would and test how it looks and works in different window sizes.

When you want to test how a website looks in full screen.

When you need to set a specific browser window size to test responsive design.

When a test requires the browser window to be a certain size to show all elements.

When you want to avoid issues caused by small or hidden browser windows during testing.

Syntax

Selenium Java

driver.manage().window().maximize();
driver.manage().window().setSize(new Dimension(width, height));
Dimension size = driver.manage().window().getSize();

maximize() makes the browser window fill the screen.

setSize() sets the window to a specific width and height in pixels.

Examples

This command makes the browser window fill the entire screen.

Selenium Java

driver.manage().window().maximize();

This sets the browser window size to 1024 pixels wide and 768 pixels tall.

Selenium Java

driver.manage().window().setSize(new Dimension(1024, 768));

This gets the current size of the browser window and prints the width and height.

Selenium Java

Dimension size = driver.manage().window().getSize();
System.out.println("Width: " + size.getWidth() + ", Height: " + size.getHeight());

Sample Program

This program opens a browser, maximizes the window, prints the size, then resizes the window to 800x600 pixels and prints the new size. Finally, it closes the browser.

Selenium Java

import org.openqa.selenium.WebDriver;
import org.openqa.selenium.chrome.ChromeDriver;
import org.openqa.selenium.Dimension;

public class WindowManagementTest {
    public static void main(String[] args) {
        System.setProperty("webdriver.chrome.driver", "path/to/chromedriver");
        WebDriver driver = new ChromeDriver();

        // Open a website
        driver.get("https://example.com");

        // Maximize the window
        driver.manage().window().maximize();

        // Print the size after maximize
        Dimension maxSize = driver.manage().window().getSize();
        System.out.println("Maximized size: Width = " + maxSize.getWidth() + ", Height = " + maxSize.getHeight());

        // Set window size to 800x600
        driver.manage().window().setSize(new Dimension(800, 600));

        // Print the size after resizing
        Dimension newSize = driver.manage().window().getSize();
        System.out.println("Resized size: Width = " + newSize.getWidth() + ", Height = " + newSize.getHeight());

        // Close the browser
        driver.quit();
    }
}

Important Notes

Make sure the browser driver path is correct before running the test.

Window size values depend on your screen resolution and browser.

Maximize may behave differently on different operating systems.

Summary

Use maximize() to fill the screen with the browser window.

Use setSize() to set a custom window size.

Use getSize() to check the current window size.

Practice

1. What does the maximize() method do in Selenium WebDriver window management?

easy

A. It retrieves the current size of the browser window.

B. It makes the browser window fill the entire screen.

C. It sets the browser window to a custom size.

D. It closes the browser window.

Solution

1. Step 1: Understand the purpose of maximize()

   The maximize() method is used to enlarge the browser window to fill the entire screen.

2. Step 2: Differentiate from other window methods

   Unlike setSize() which sets a custom size, maximize() fills the screen automatically.

3. Final Answer:

   It makes the browser window fill the entire screen. -> Option B

4. Quick Check:

   maximize() = fills screen [OK]

Hint: maximize() fills the screen fully, setSize() sets custom size [OK]

Common Mistakes:

• Confusing maximize() with setSize()
• Thinking maximize() returns window size
• Assuming maximize() closes the window

2. Which of the following is the correct syntax to set the browser window size to 1024x768 in Selenium Java?

easy

A. driver.manage().window().maximize(1024, 768);

B. driver.window().setSize(1024, 768);

C. driver.setSize(1024, 768);

D. driver.manage().window().setSize(new Dimension(1024, 768));

Solution

1. Step 1: Recall correct method to set window size

   In Selenium Java, setSize() requires a Dimension object with width and height.

2. Step 2: Check syntax correctness

   driver.manage().window().setSize(new Dimension(1024, 768)); correctly uses driver.manage().window().setSize(new Dimension(1024, 768));. Other options misuse method names or parameters.

3. Final Answer:

   driver.manage().window().setSize(new Dimension(1024, 768)); -> Option D

4. Quick Check:

   setSize() needs Dimension object [OK]

Hint: Use new Dimension(width, height) inside setSize() [OK]

Common Mistakes:

• Calling maximize() with parameters
• Using setSize() without Dimension object
• Wrong method chaining like driver.window()

3. What will be the output of the following code snippet?

driver.manage().window().setSize(new Dimension(800, 600));
Dimension size = driver.manage().window().getSize();
System.out.println(size.getWidth() + "," + size.getHeight());

medium

A. 800,600

B. 600,800

C. 0,0

D. Throws a runtime exception

Solution

1. Step 1: Set window size to 800x600

   The code sets the browser window size to width=800 and height=600 using setSize().

2. Step 2: Retrieve and print the window size

   The getSize() method returns the current size, which is then printed as "width,height".

3. Final Answer:

   800,600 -> Option A

4. Quick Check:

   setSize(800,600) then getSize() = 800,600 [OK]

Hint: getSize() returns current size after setSize() [OK]

Common Mistakes:

• Mixing width and height order
• Expecting maximize() effect instead
• Assuming getSize() returns null or error

4. Identify the error in the following Selenium Java code snippet for setting window size:

driver.manage().window().setSize(1024, 768);

medium

A. The method name should be setWindowSize(), not setSize().

B. setSize() cannot be called on driver.manage().window().

C. setSize() requires a Dimension object, not two integers.

D. The code is correct and will run without errors.

Solution

1. Step 1: Check setSize() method parameters

   The setSize() method requires a single Dimension object, not two separate integers.

2. Step 2: Identify the error cause

   Passing two integers directly causes a compile-time error because no matching method exists.

3. Final Answer:

   setSize() requires a Dimension object, not two integers. -> Option C

4. Quick Check:

   setSize() needs Dimension object [OK]

Hint: Always wrap width and height in new Dimension() for setSize() [OK]

Common Mistakes:

• Passing width and height as separate arguments
• Using wrong method name
• Ignoring compile-time errors

5. You want to maximize the browser window and then verify if the window width is greater than 1200 pixels. Which code snippet correctly performs this check in Selenium Java?

hard

A. driver.manage().window().maximize();
Dimension size = driver.manage().window().getSize();
if (size.getWidth() > 1200) {
System.out.println("Width is greater than 1200");
}

B. driver.manage().window().setSize(new Dimension(1200, 800));
Dimension size = driver.manage().window().getSize();
if (size.getWidth() > 1200) {
System.out.println("Width is greater than 1200");
}

C. driver.manage().window().maximize(1200, 800);
Dimension size = driver.manage().window().getSize();
if (size.getWidth() > 1200) {
System.out.println("Width is greater than 1200");
}

D. driver.manage().window().maximize();
Dimension size = driver.manage().window().getSize();
if (size.getHeight() > 1200) {
System.out.println("Width is greater than 1200");
}

Solution

1. Step 1: Maximize the browser window

   Use maximize() without parameters to fill the screen.

2. Step 2: Get window size and check width

   Retrieve size with getSize() and compare width with 1200 pixels.

3. Step 3: Verify correctness of condition and output

   driver.manage().window().maximize(); Dimension size = driver.manage().window().getSize(); if (size.getWidth() > 1200) { System.out.println("Width is greater than 1200"); } correctly checks width > 1200 and prints the message.

4. Final Answer:

   Option A code snippet correctly maximizes and checks width. -> Option A

5. Quick Check:

   maximize() then getSize().getWidth() > 1200 [OK]

Hint: maximize() no params; getSize() then check width [OK]

Common Mistakes:

• Passing parameters to maximize()
• Checking height instead of width
• Using setSize() instead of maximize() for full screen