There are times in the life-cycle of various web applications where you need to interrupt a message to the user. These may be warnings, alerts, or information. Browsers have native dialog boxes, one that you can show to alert users to these important messages using JavaScript.
Suppose you fill in an application form and accidentally miss out on a couple of details. How do you know this unless there is a notification alert or a pop-up window? Or If we test a web application using Selenium JavaScript and try logging in to a web site, but do not add an email ID or password to the required fields, the program sends an alert. This is precisely what I will be talking about today. I will be performing Selenium test automation using Protractor to handle alerts and pop-ups.