Prevent the print dialog window from appearing when a page loads in Selenium for Firefox and Chrome

Is there a way to prevent the print window from automatically popping up when a page loads using Selenium?

So far, I have tried using the Robot class to press the escape key, but it only works 80% of the time. I have also experimented with Firefox preferences and overriding the window.print function.

Unfortunately, none of these methods completely disable the print window on page load. I am seeking guidance on how to achieve this specifically for Firefox and Selenium (Google Chrome solutions are optional).

I am unable to access the JavaScript code of the target website, as it is obfuscated, making it difficult to pinpoint which script triggers the print window on page load.

Upon further investigation, I discovered that the print window appears due to a specific piece of JavaScript code:

n.iframeNode.on('load', function () {
    n.iframeNode[0].elem.contentWindow.print()
}),

I have also attempted different approaches such as disabling JavaScript entirely, tinkering with JS events, and exploring proxy concepts without success.

If you have any insights or suggestions on how to effectively stop the print window from appearing on page load, please share them. Your assistance in resolving this issue would be greatly appreciated.

javascriptseleniumfirefox

Answer №1

When dealing with the Chrome browser's print preview page, it is important to note that the controls are hidden within the ShadowDOM. In this case, it is recommended to interact with the "Cancel" button using Selenium rather than relying on Robot. This approach ensures better compatibility, especially when running tests in Selenium Grid or in parallel where managing focus between windows can be tricky.

To locate and click the "Cancel" button, you can follow this path:

https://i.sstatic.net/2TK85.png

You can then navigate to the button and trigger a click using the following Java code snippet:

new WebDriverWait(driver, 10).until(ExpectedConditions.numberOfWindowsToBe(2));
driver.switchTo().window(driver.getWindowHandles().stream().skip(1).findFirst().get());
WebElement printPreviewApp = driver.findElement(By.tagName("print-preview-app"));
WebElement printPreviewAppContent = expandShadowRoot(printPreviewApp, driver);
WebElement printPreviewSidebar = printPreviewAppContent.findElement(By.tagName("print-preview-sidebar"));
WebElement printPreviewSidebarContent = expandShadowRoot(printPreviewSidebar, driver);
WebElement printPreviewHeader = printPreviewSidebarContent.findElement(By.tagName("print-preview-header"));
WebElement printPreviewHeaderContent = expandShadowRoot(printPreviewHeader, driver);
printPreviewHeaderContent.findElements(By.tagName("paper-button")).get(1).click();

The expandShadowRoot function converts the given ShadowRoot into a Selenium WebElement, as shown below:

private WebElement expandShadowRoot(WebElement parent, WebDriver driver) {
    return (WebElement) ((JavascriptExecutor) driver).executeScript("return arguments[0].shadowRoot", parent);
}

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