Waiting for a new tab/window to open

[gillyb]

I created a test that clicks on a link that opens a new tab. I want to
verify that the new tab is on the right url, so i switch to the new
WebHandle like this :

var newWindow = WebDriver.WindowHandles[1];
WebDriver.SwitchTo().Window(newWindow);

The problem is that i get an error like this :
System.InvalidOperationException: respond.session.getWindow() is null
at
OpenQA.Selenium.Remote.RemoteWebDriver.UnpackAndThrowOnError(Response
errorResponse)

When i run this test on my computer it works, but on the build server
at my job it doesn't, and the error is thrown.
This leads me to believe that the error is because the build server is
slower, and therefore the WindowHandle isn't created when i try to
switch to it.

I added Thread.Sleep(), and it fixed the problem, but I was wondering
if there was a better way to fix this problem ??

[Mark Collin]

Try this:

public void waitForNumberOfWindowsToEqual(final int numberOfWindows) {
new WebDriverWait(driver, timeout) {
}.until(new ExpectedCondition<Boolean>() {
@Override
public Boolean apply(WebDriver driver) {
return (driver.getWindowHandles().size() == numberOfWindows);
}
});
}

Set the number of windows you are expecting using the above function and
then use the line of code you have shown below.

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[gillyb]

I probably forgot to state that im working in C#.
Do you know how i can write that in C# ?

Thanks!

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[Moises Siles]

pretty much it should be the same, just change the line

wait.Until(driver => webDriver.WindowHandles.Count() == numberOfWindows);

[famzy]

Thank you Mark. This solution works perfectly in 2020.

seleniu...@googlegroups.com.

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