Guarantee switching to a specific window in Selenium

Question

I have googled and looked at this site for reference but all the answers I came across did not provide a guaranteed way to switch to a specific window.

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I am using Java with Selenium and I trying to find a guaranteed way to switch between two windows (where the second window is from clicking a link that produces a pop up).

driver.getWindowHandles() creates a Set object and since the Set interface does not provide any ordering guarantees, how will I be able to switch to a specific window?

What I currently have is this:

public static void switchToPopUpWindow(By by) {
    driver.findElement(by).click();
    Set<String> handles = driver.getWindowHandles();
    if (handles.size() > 1) {
        for (String currentWindow : handles) {
            driver.switchTo().window(currentWindow);
        }
    } else {
        logger.info("There is only one window open...");
    }
}

However, since the ordering is not guaranteed, it won't always land on the window that I want. How can I guarantee a switch to the pop up window?

Answer 1

How To Work with Multiple Windows

Some browsers might order windows by the order of being opened, other in alphabetic title order. Suggested solution is to get the list of active windows before new is opened, and compare them afterwards to find the new one.

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Answer 2

This is the simple and best way to handle multiple window's.

public void Test(){
    String parentWindowHandler = driver.getWindowHandle(); // Store your parent window
    String subWindowHandler = null;

    Set<String> handles = driver.getWindowHandles(); // get all window handles
    Iterator<String> iterator = handles.iterator();
    while (iterator.hasNext()){
        subWindowHandler = iterator.next();
    }
    driver.switchTo().window(subWindowHandler); // switch to popup window
                                                // perform operations on popup

    driver.switchTo().window(parentWindowHandler);  // switch back to parent window

}

For modal dialogue and popups Alerts