Unable to handle newly opened GrandChild window (Lookup) from a child window

Question

In my project i tried to automate Creating a new employee , for that i need to click a link which will open a child window from main window and in that child window i need to click on a lookup button, to select a report manager for that employee . After clicking that lookup im getting a new grandchild window which contains list of managers name, so that i can select one from it.

Following is the code that i have used to move between windows,

// Moving from Parent to Child

    String parentWindow = driver.getWindowHandle();

    Set<String> windowHandles = driver.getWindowHandles();      

    System.out.println(windowHandles.size());

    windowHandles.remove(parentWindow);

   driver.switchTo().window((String) windowHandles.toArray()[0]);

   // Click lookup to emulate Grandchild window
   driver.findElement(..)

   //From child to grandchild

   Set<String> grandChild_Child_ParentHandles=driver.getWindowHandles();

    grandChild_Child_ParentHandles.remove(parentWindow);
    grandChild_Child_ParentHandles.remove(windowHandles);

    System.out.println(grandChild_Child_ParentHandles.size());

    driver.switchTo().window((String) grandChild_Child_ParentHandles.toArray()[0]);

    System.out.println(driver.getTitle());

My code is running till clicking that lookup , after that my code stopped to execute. And the code starts again if and only i closed the Grandchild window manually .I'm wondering why it happening.

Kindly help!

Thanks in Advance, Siva

Answer 1

I faced this problem because of Modal window,Which can be resolved by using Multi threading concept. Usually once a modal window has evoked it will block its parent window , which meant that we cant move our driver to the new child window.So after the modal window evoked our code stops to work.

Try to refer the below sample code for multi threading ,which i've found in net.

import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.firefox.FirefoxDriver;
import org.openqa.selenium.support.ui.ExpectedCondition;
import org.openqa.selenium.support.ui.WebDriverWait;

class NewThread implements Runnable {
static WebDriver driver = new FirefoxDriver();
Thread t;

NewThread() {
try {
Thread.sleep(10000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

// Create a new, second thread
t = new Thread(this, "Demo Thread");
System.out.println("Child thread: " + t);
// Start the thread
t.start();
}

// This is the entry point for the second thread.
public void run() {
try {

System.out.println("This thread has got the control now");
Thread.sleep(5000);

} catch (InterruptedException e) {
System.out.println("Child interrupted.");
}

for (String handle : driver.getWindowHandles()) {
driver.switchTo().window(handle);
}

String nextHandle = driver.getWindowHandle();
System.out.println("nextHnadle" + nextHandle);

try {
Thread.sleep(4000);
} catch (InterruptedException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}

driver.findElement(By.id("foo")).clear();
driver.findElement(By.id("foo")).sendKeys("4");
try {
Thread.sleep(2000);
} catch (InterruptedException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}

driver.findElement(By.linkText("link")).click();
try {
Thread.sleep(4000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

driver.quit();
System.out.println("Exiting child thread.");
}

// execution will start from here
public static void main(String args[]) throws InterruptedException {
try {
// open the webpage
driver.get("https://developer.mozilla.org/samples/domref/showModalDialog.html");

// get window handle
String currenthandle = driver.getWindowHandle();
System.out.println("currenthandle" + currenthandle);

//start a new thread
new NewThread();

// click on the button to open model window dialog
driver.findElement(By.tagName("input")).click();

} catch (Exception e) {
System.out.println("Main thread interrupted.");
}
System.out.println("Main thread exiting.");
}

}