How to Wait for an Alert in Selenium WebDriver with C#?

Question

How can i set Selenium WebDriver to Wait for an Alert before accepting it instead of Thread.Sleep?

As website, sometimes loads very slowly or sometimes fast.

Thanks

Answer 1

You should apply webdriver wait for an alert to be present properly.

var wait = new WebDriverWait(driver, TimeSpan.FromSeconds(15));
wait.Until(SeleniumExtras.WaitHelpers.ExpectedConditions.AlertIsPresent());

OR write a boolean function to check alert present and use it for wait

bool IsAlertShown(WebDriver driver) {
    try {
        driver.SwitchTo().Alert();
    } catch(NoAlertPresentException e) {
        return false;
    }
    return true;
}

Use it as below

var wait = new WebDriverWait(driver, TimeSpan.FromSeconds(20));
wait.Until(driver => IsAlertShown(driver));