How can selenium web driver get to know when the new window has opened and then resume its execution

Question

I am facing an issue in automating a web application using selenium web driver.

The webpage has a button which when clicked opens a new window. When I use the follow

Answer 1

You can wait for another window to pop using WebDriverWait. First you have to save current handles of all opened windows:

private Set<String> windowHandlersSet = driver.getWindowHandles();

Then you click a button to open a new window and wait for it to pop with:

WebDriverWait wait = new WebDriverWait(driver, 10);
wait.until(driver -> !driver.getWindowHandles().equals(windowHandlersSet));

Which checks if there is a change to current window handles set comparing to saved one. I used this solutnion writing tests under Internet Explorer where it always takes few seconds to open new window.