org.openqa.selenium.UnhandledAlertException: unexpected alert open

Question

I am using a Chrome Driver and trying to test a webpage.

Normally it runs fine, but sometimes I get exceptions:

 org.openqa.selenium.UnhandledAlertE         


        

Answer 1

You can use Wait functionality in Selenium WebDriver to wait for an alert, and accept it once it is available.

In C# -

public static void HandleAlert(IWebDriver driver, WebDriverWait wait)
{
    if (wait == null)
    {
        wait = new WebDriverWait(driver, TimeSpan.FromSeconds(5));
    }

    try
    {
        IAlert alert = wait.Until(drv => {
            try
            {
                return drv.SwitchTo().Alert();
            }
            catch (NoAlertPresentException)
            {
                return null;
            }
        });
        alert.Accept();
    }
    catch (WebDriverTimeoutException) { /* Ignore */ }
}

Its equivalent in Java -

public static void HandleAlert(WebDriver driver, WebDriverWait wait) {
    if (wait == null) {
        wait = new WebDriverWait(driver, 5);
    }

    try {
        Alert alert = wait.Until(new ExpectedCondition{
            return new ExpectedCondition() {
              @Override
              public Alert apply(WebDriver driver) {
                try {
                  return driver.switchTo().alert();
                } catch (NoAlertPresentException e) {
                  return null;
                }
              }
            }
        });
        alert.Accept();
    } catch (WebDriverTimeoutException) { /* Ignore */ }
}

It will wait for 5 seconds until an alert is present, you can catch the exception and deal with it, if the expected alert is not available.