Selenium Eror org openqa selenium UnhandledAlertException unexpected alert open

Question

I'm using ChromeDriver to test a webpage. Usually, it works without a problem but sometimes I get this exception:

 org.openqa.selenium.UnhandledAlertException: unexpected alert open
 (Session info: chrome=38.0.2125.111)
 (Driver info: chromedriver=2.9.248315,platform=Windows NT 6.1 x86) (WARNING: The server did not  provide any stacktrace information)
 Command duration or timeout: 16 milliseconds: null
 Build info: version: '2.42.2', revision: '6a6995d', time: '2014-06-03 17:42:30'
 System info: host: 'Casper-PC', ip: '10.0.0.4', os.name: 'Windows 7', os.arch: 'x86', os.version:  '6.1', java.version: '1.8.0_25'
 Driver info: org.openqa.selenium.chrome.ChromeDriver

So, to get rid of this, I handled this alert:

  Alert alt = driver.switchTo().alert();
  alt.accept();

But this does not work and now i get no element exception: org.openqa.selenium.NoAlertPresentException

Below is the screenshot:-

Can someone suggest the solution? Because I do not receive this exception always. And when it occurs then the test fails.

sniffy_god · Answer 1 · May 29, 2018

Even I had a similar problem. This happens because of driver's default behaviour when it encounters an alert. The default behaviour is "ACCEPT". That's why the alert gets closed automatically, and switchTo().alert() cannot find it.

By modifying the default behaviour of the driver to ("IGNORE"), the alert will not close. This is how you do it:

DesiredCapabilities dc = new DesiredCapabilities();
dc.setCapability(CapabilityType.UNEXPECTED_ALERT_BEHAVIOUR, UnexpectedAlertBehaviour.IGNORE);
d = new FirefoxDriver(dc);

You can then handle it with this:

try {
    click(myButton);
} catch (UnhandledAlertException f) {
    try {
        Alert alert = driver.switchTo().alert();
        String alertText = alert.getText();
        System.out.println("Alert data: " + alertText);
        alert.accept();
    } catch (NoAlertPresentException e) {
        e.printStackTrace();
    }
}