Handling a popup window using selenium

Question

I have a circumstance in which clicking a linked webpage opens a popup window. And after the popup window opens the focus is in the popup window and master window is disabled. And I am unable to get the control transferred to the popup window. Please have a look at the following code.

driver.findElement(By.linkText("Click me")).click();// when this line of code is reached then a popup window opens.

System.out.println("After Clicking me"); // After the popup window opens this line of code is never executed.

I am unable to transfer the control from parent window to the popup window. I am aware of the following command.

driver.switchTo().window("popup window");

Answer 1

This is a code I use when I need to work with a following pop-up window, close it and go back to my main window. Of course, it has been simplified for the purpose of this answer. It maintains a handle of the original window (main) so it can make a difference between the others.

It requires an explicit WebDriverWait because I did have problems during development that code got to run before the window actually got open, so this might not be an ideal condition,

function manipulatePopUp(final WebDriver driver, final WebDriverWait wait) {
    final String mainWindowHandle = driver.getWindowHandle();
    driver.findElement(By.id("linkThatOpensPopUp")).click();

    wait.until(new ExpectedConditions<Boolean>() {
        @Override
        public Boolean apply(WebDriver d) {
            return (d.getWindowHandles().size() != 1);
        }
    });

    for (String activeHandle : driver.getWindowHandles()) {
        if (!activeHandle.equals(mainWindowHandle)) {
            driver.switchTo().window(activeHandle);
        }
    }

    driver.close();
    driver.switchTo().window(mainWindowHandle);
}