How to switch to the new browser window, which opens after click on the button?

I have situation, when click on button opens the new browser window with search results.

Is there any way to connect and focus to new opened browser window?

And work with it, then return back to original(first) window.

You can switch between windows as below:

// Store the current window handle
String winHandleBefore = driver.getWindowHandle();

// Perform the click operation that opens new window

// Switch to new window opened
for(String winHandle : driver.getWindowHandles()){
    driver.switchTo().window(winHandle);
}

// Perform the actions on new window

// Close the new window, if that window no more required
driver.close();

// Switch back to original browser (first window)
driver.switchTo().window(winHandleBefore);

// Continue with original browser (first window)

Just to add to the content ...

To go back to the main window(default window) .

use driver.switchTo().defaultContent();

This script helps you to switch over from a Parent window to a Child window and back cntrl to Parent window

String parentWindow = driver.getWindowHandle();
Set<String> handles =  driver.getWindowHandles();
   for(String windowHandle  : handles)
       {
       if(!windowHandle.equals(parentWindow))
          {
          driver.switchTo().window(windowHandle);
         <!--Perform your operation here for new window-->
         driver.close(); //closing child window
         driver.switchTo().window(parentWindow); //cntrl to parent window
          }
       }

Surya, your way won't work, because of two reasons:

you can't close driver during evaluation of test as it will loose focus, before switching to active element, and you'll get NoSuchWindowException.
if test are run on ChromeDriver you`ll get not a window, but tab on click in your application. As SeleniumDriver can't act with tabs, only switchs between windows, it hangs on click where new tab is being opening, and crashes on timeout.

Modify registry for IE:

HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main
Right-click → New → String Value → Value name: TabProcGrowth (create if not exist)
TabProcGrowth (right-click) → Modify... → Value data: 0

Source: Selenium WebDriver windows switching issue in Internet Explorer 8-10

For my case, IE began detecting new window handles after the registry edit.

Taken from the MSDN Blog:

Tab Process Growth : Sets the rate at which IE creates New Tab processes.

The "Max-Number" algorithm: This specifies the maximum number of tab processes that may be executed for a single isolation session for a single frame process at a specific mandatory integrity level (MIC). Relative values are:

TabProcGrowth=0 : tabs and frames run within the same process; frames are not unified across MIC levels.

TabProcGrowth =1: all tabs for a given frame process run in a single tab process for a given MIC level.

Source: Opening a New Tab may launch a New Process with Internet Explorer 8.0

Internet Options:

Security → Untick Enable Protected Mode for all zones (Internet, Local intranet, Trusted sites, Restricted sites)
Advanced → Security → Untick Enable Enhanced Protected Mode

Code:

Browser: IE11 x64 (Zoom: 100%)
OS: Windows 7 x64
Selenium: 3.5.1
WebDriver: IEDriverServer x64 3.5.1

public static String openWindow(WebDriver driver, By by) throws IOException {
String parentHandle = driver.getWindowHandle(); // Save parent window
WebElement clickableElement = driver.findElement(by);
clickableElement.click(); // Open child window
WebDriverWait wait = new WebDriverWait(driver, 10); // Timeout in 10s
boolean isChildWindowOpen = wait.until(ExpectedConditions.numberOfWindowsToBe(2));
if (isChildWindowOpen) {
    Set<String> handles = driver.getWindowHandles();
    // Switch to child window
    for (String handle : handles) {
        driver.switchTo().window(handle);
        if (!parentHandle.equals(handle)) {
            break;
        }
    }
    driver.manage().window().maximize();
}
return parentHandle; // Returns parent window if need to switch back
}



/* How to use method */
String parentHandle = Selenium.openWindow(driver, by);

// Do things in child window
driver.close();

// Return to parent window
driver.switchTo().window(parentHandle);

The above code includes an if-check to make sure you are not switching to the parent window as Set<T> has no guaranteed ordering in Java. WebDriverWait appears to increase the chance of success as supported by below statement.

Quoted from Luke Inman-Semerau: (Developer for Selenium)

The browser may take time to acknowledge the new window, and you may be falling into your switchTo() loop before the popup window appears.

You automatically assume that the last window returned by getWindowHandles() will be the last one opened. That's not necessarily true, as they are not guaranteed to be returned in any order.

Source: Unable to handle a popup in IE,control is not transferring to popup window

How to switch to the new browser window, which opens after click on the button?

Modify registry for IE:

Taken from the MSDN Blog:

Internet Options:

Code:

Quoted from Luke Inman-Semerau: (Developer for Selenium)

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