Handling print window in selenium webdriver - selenium-webdriver

Question

There is a print button in my application. When I click on the button print windows open with cancel and print button.
I want to click on cancel button in the print window.
I know handling print window is not possible using selenium webdriver alone. I tried using Robot class. But it is not working.
WebDriver driver = (WebDriver) new ChromeDriver();
driver.get("https://www.joecolantonio.com/SeleniumTestPage.html");
driver.manage().window().maximize();
Thread.sleep(2000);
//clicking on the print button
driver.findElement(By.id("printButton")).click();
//print window opens
//creating robot class object
Robot r = new Robot();
r.delay(1000);
r.keyPress(KeyEvent.VK_ESCAPE);
r.keyRelease(KeyEvent.VK_ESCAPE);
The print window opens but nothing happens after that. I was expecting escape button will make the window exit but its does not happens. But manually when I press escape button print window disappears.

Answer 1

Actually you can handle print page window using javascript executor in selenium.
following codes are c#.
If your program is stuck after opening window.print(); which in my case it was happening, try to use the following javascript code instead:
setTimeout(function() { window.print(); }, 0);
this will release your application and you can work with the print page.
then you can switch to the print page simply by the following line:
driver.SwitchTo().Window(driver.WindowHandles.Last());
then you can get the JSPath of any element in print window and interact with it
(IWebElement)js.ExecuteScript($"return {JSPath}").Click();
A complete example of this, is as follows where print window will be opened then the cancel button will be clicked after 2 seconds.
IJavaScriptExecutor js = (IJavaScriptExecutor)driver;
js.ExecuteScript("setTimeout(function() { window.print(); }, 0);");
driver.SwitchTo().Window(driver.WindowHandles.Last());
Thread.Sleep(2000);
string JSPath = "document.querySelector('body>print-preview-app').shadowRoot.querySelector('#sidebar').shadowRoot.querySelector('print-preview-button-strip').shadowRoot.querySelector('cr-button.cancel-button')";
IWebElement cancelBtn = (IWebElement)js.ExecuteScript($"return {JSPath}");
cancelBtn.Click();
Since the elements in print window exist in the shadow root you cannot select them by selenium web driver that's why I used Javascript Executor to get the cancel button.

Answer 2

Use tab and then click escape.I think it works.

Answer 3

Using Robot is not something I would recommend to handling the print preview page as it will bite you back when you will be running your tests in Parallel mode.
You could click "Cancel" button as follows:
Switch to the Print Preview window using driver.switchTo() function:
driver.switchTo().window(driver.getWindowHandles().stream().filter(handle -> !handle.equals(driver.getWindowHandle())).findAny().get());
Find preview-app Shadow DOM element using i.e. XPath and convert it into a WebElement
WebElement printPreviewApp = driver.findElement(By.xpath("//print-preview-app"));
WebElement printPreviewAppContent = (WebElement) driver.executeScript("return arguments[0].shadowRoot", printPreviewApp);
Find preview-header Shadow DOM element using i.e. CSS and convert into a Selenium's Web Element
WebElement printPreviewHeader = printPreviewAppContent.findElement(By.cssSelector("print-preview-header"));
WebElement printPreviewHeaderContent = (WebElement) driver.executeScript("return arguments[0].shadowRoot", printPreviewHeader);
Locate Cancel button and click it
printPreviewHeaderContent.findElement(By.cssSelector("paper-button[class*=cancel]")).click();

Answer 4

Answer for someone else who still looking solution
To download save as a pdf from the print pop-up window from any web
Add argument
options.addArguments("kiosk-printing");
This will prevent to open any popups from clicking on any print button.But a window dialog folder will open to download the file as a pdf.
Now you need to input the file name and press enter button. For this, we will use the robot class
StringSelection s=new StringSelection("remotePetrol_report.pdf"); // Set the File Name
Toolkit.getDefaultToolkit().getSystemClipboard().setContents(s,null);
//native keystrokes for CTRL, V, and ENTER keys
Robot robot = new Robot();
robot.keyPress(KeyEvent.VK_CONTROL);
robot.keyPress(KeyEvent.VK_V);
robot.keyRelease(KeyEvent.VK_V);
robot.keyRelease(KeyEvent.VK_CONTROL);
robot.keyPress(KeyEvent.VK_ENTER);
robot.keyRelease(KeyEvent.VK_ENTER);