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Updated on 2025-03-04

Java Playwright achieves browser maximization

Playwright is a modern tool for automated web application testing, supporting multiple languages ​​(including Java) and multiple browsers (such as Chromium, Firefox, and WebKit). It provides a consistent API to control browser behavior, including window operations such as maximization. This article will introduce in detail how to maximize browser windows in Java Playwright and provide detailed code examples.

Method 1

1. Theoretical Overview

Introduction to Playwright

Playwright is an automated testing tool that controls browser behavior by directly communicating with browser processes, sending and receiving commands. It provides a rich API that can simulate user operations such as clicks, inputs, navigation, etc., which is ideal for web testing automation, UI compatibility testing, and data acquisition.

Window to maximize demand

In automated testing, window maximization is a common requirement. This helps ensure that the web layout still meets design expectations when maximizing the window, verify the application's performance at different screen sizes, and get more comprehensive information.

Implementation method

Playwright itself does not provide a directmaximizeMethod to maximize the window, but you can set the browser'sviewportSizeTo simulate the maximization of the window. In addition, the window can be resized through JavaScript code.

2. Environmental preparation

Install

Make sure that your development environment is already installed. You canOfficial websiteDownload and install a version suitable for your operating system.

Install Playwright

Install Playwright via npm:

npm install -g playwright

Add Java dependencies

If you are using the Maven project, you canAdd the following dependencies to the file:

<dependency>
    <groupId></groupId>
    <artifactId>playwright</artifactId>
    <version>1.20.0</version>
</dependency>

If it is a Gradle project, you canAdd the following dependencies to the file:

dependencies {
    implementation ':playwright:1.20.0'
}

3. Implementation steps

Initialize Playwright and Browser

First, initialize Playwright and start the browser. Then, after the browser starts, maximize the window.

Set viewport size

pass()Method set a large enough viewport size to simulate the maximum browser window. Usually, you can set the viewport size to the resolution of the screen.

Resize windows using JavaScript code

pass()Methods execute JavaScript code in the browser context to resize the window.

4. Code Example

Here is a complete Java code example showing how to maximize browser windows in Playwright.

import .*;
 
import .*;
 
public class BrowserMaximizeExample {
    public static void main(String[] args) throws AWTException {
        // Get screen resolution        Toolkit toolkit = ();
        Dimension screenSize = ();
        int screenWidth = ;
        int screenHeight = ;
 
        // Start Playwright        try (Playwright playwright = ()) {
            // Start the browser (recommended to use Chromium)            Browser browser = ().launch(new ().setHeadless(false));
 
            // Create browser context and page            BrowserContext context = ();
            Page page = ();
 
            // Set the browser window to screen resolution            (screenWidth, screenHeight);
 
            // Open the web page            ("");
 
            // Use JavaScript code to resize the window to screen size (optional)            // Note: In some cases, this step may be redundant, because setViewportSize has set the viewport size            // But to ensure the window is maximized, you can add the following code            ("() =&gt; {" +
                    "(0, 0);" +
                    "(, );" +
                    "}");
 
            // Print the current viewport size to confirm that the window has been maximized            ("Viewport size: " + ().width + "x" + ().height);
 
            // Wait for some time to keep the browser window open            (5000);
 
            // Close the browser            ();
        }
    }
}

5. Code description

Get screen resolution

Using JavaToolkitClass takes the screen resolution and stores it inscreenWidthandscreenHeightin variable.

Start Playwright

use()Method creates a new Playwright instance.

Start the browser

use().launch()Method to start a Chromium browser instance.setHeadless(false)It means that header mode is enabled so that you can see the browser interface.

Create browser context and page

use()Methods create a new browser context and use()Method to open a new browser page.

Set viewport size

use(screenWidth, screenHeight)Methods: Set the viewport size of the browser, and set it to the screen resolution size here.

Open a web page

use("")Method to open a web page.

Resize windows using JavaScript code (optional)

In some cases, you may need to use JavaScript code to further resize the window. Used here()Methods execute JavaScript code in the browser context, move the window to the upper left corner of the screen, and resize it to screen resolution.

Print the current viewport size

use()Method gets the size of the current viewport and prints it out to confirm that the window has been maximized.

Wait for some time

use(5000)Method: Wait for some time and keep the browser window open. This way you can manually check whether the window has been maximized.

Close the browser

use()Method to close the browser instance.

6. Conclusion

Through the above steps and code examples, you can maximize the browser window in Java Playwright. This helps ensure that the web layout still meets design expectations when maximizing the window, verify the application's performance at different screen sizes, and get more comprehensive information. I hope this article will be helpful to you and I wish you better results in automated testing!

Method 2

Perform window maximization operations using JavaScript

Although Playwright itself does not provide a directmaximizeMethod, but you can pass()Methods execute JavaScript code in the browser context to maximize the window. Here is a sample code:

import .*;
 
public class MaximizeBrowserWithJavaScript {
    public static void main(String[] args) {
        try (Playwright playwright = ()) {
            // Start the browser (taking Chromium as an example)            Browser browser = ().launch(new ().setHeadless(false));
            
            // Create a page            Page page = ();
            
            // Navigate to the landing page            ("");
            
            // Maximize windows with JavaScript            ("() =&gt; {" +
                    "(0, 0);" + // Move the window to the upper left corner of the screen                    "(, );" + // Resize the window to the available width and height of the screen                    "}");
            
            // Wait for some time to see if the window is maximized            (5000);
            
            // Close the browser            ();
        }
    }
}

In this example,(0, 0)Move the window to the upper left corner of the screen, and(, )Then adjust the window size to the available width and height of the screen to maximize the effect.

Method 3

In combination with the operating system API to obtain screen resolution and set

If you need to set the browser window size more dynamically, you can combine it with Java'sToolkitClass to get the screen resolution and set it to the size of the browser window. This approach has been shown in the previous example, but here is the steps:

  • use().getScreenSize()Get the screen resolution.
  • use(screenWidth, screenHeight)Set the browser viewport size to the screen resolution.

The advantage of this approach is that it is able to dynamically adjust the browser window size according to the screen resolution of the current device, thereby more realistically emulating the user's browsing experience on different devices.

Things to note

  • Platform compatibility: The above method is suitable for most desktop browsers, but in some special cases (such as mobile device simulation) it may require different handling methods.
  • Browser Limitations: Some browser or browser configurations may limit window size adjustments, so adjustments may need to be made according to the specific situation in actual applications.
  • Performance considerations: Frequent resizing windows may have an impact on test performance, so it is recommended to do this if necessary.

To sum up, performing window maximization operations through JavaScript or obtaining screen resolution and setting them in combination with the operating system API is another way to implement it besides setting the viewport size. In practical applications, you can choose appropriate methods based on specific needs and test environments to maximize the browser window.

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