How To Handle Unexpected Alerts In Selenium WebDriver

Some times when we browsing software web application, Display some unexpected alerts due to some error or some other reasons. This kind of alerts not display every time but they are displaying only some time. If you have created webdriver test case for such page and not handled this kind of alerts In your code then your script will fail Immediately If such unexpected alert pop up displayed.

Now unexpected alert appears only some times so we can not write direct code to accept or dismiss that alert. In this kind of situation, we have to handle them specially.

To handle this kind of unexpected alerts, You must at least aware about on which action such unexpected alert Is generated. Sometimes, They are generated during page load and sometime they are generated when you perform some action. So first of all we have to note down the action where such unexpected alert Is generated and then we can check for alert after performing that action. We need to use try catch block for checking such unexpected alters because If we will use direct code(without try catch) to accept or dismiss alert and If alert not appears then our test case will fail. try catch can handle both situations.

I have one example where alert Is displaying when loading page. So we can check for alert Inside try catch block after page load as shown In bellow given example. After loading page, It will check for alert. If alert Is there on the page then It will dismiss It else It will go to catch block and print message as shown In bellow given example.

 

package com.company;

import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.firefox.FirefoxDriver;
//import org.testng.annotations.AfterTest;//import org.testng.annotations.BeforeTest;//import org.testng.annotations.Test;
import java.util.concurrent.TimeUnit;

public class HandleunexpectedAlert {
    WebDriver driver;

    @Before    public void setup() throws Exception {
        driver =new FirefoxDriver();
        driver.manage().window().maximize();
        driver.manage().timeouts().implicitlyWait(5, TimeUnit.SECONDS);
        driver.get("http://only-testing-blog.blogspot.in/2014/06/alert_6.html");
    }

    @After    public void tearDown() throws Exception {
        driver.quit();
    }

    @Test    public void Text() throws InterruptedException {
        //To handle unexpected alert on page load.        try{
            driver.switchTo().alert().dismiss();
        }catch(Exception e){
            System.out.println("unexpected alert not present");
        }

        driver.findElement(By.xpath("//input[@name='fname']")).sendKeys("fname");
        driver.findElement(By.xpath("//input[@name='lname']")).sendKeys("lname");
        driver.findElement(By.xpath("//input[@type='submit']")).click();
    }
}

Above given webdriver code Is just for example. It Is just explaining the way of using try catch block to handle unexpected alert. You can use such try catch block In that area where you are facing unexpected alerts very frequently.