Learn JavaScript from Scratch JavaScript for Everyone - When the Page is Refreshed

The video tutorial explains the use of the 'beforeunload' event in web browsers, which prompts users with a confirmation dialog when they attempt to leave a page. It covers how to implement this event using JavaScript, discusses its limitations, and provides practical applications such as tracking user progress in a video player. The tutorial also includes a hands-on exercise to help viewers practice implementing and testing the 'beforeunload' event.

What is the primary purpose of the 'beforeunload' event in web browsers?

• To close the browser window

• To refresh the page content

• To prompt users before they leave a page

• To automatically save user data

Why might an alert message not work as expected with the 'beforeunload' event?

• Browsers block alert messages during 'beforeunload'

• Alert messages require a server-side script

• Alert messages are not supported in JavaScript

• The 'beforeunload' event only works with console logs

What is a suggested alternative to using alert messages with the 'beforeunload' event?

• Using a server-side script

• Implementing a console log

• Creating a new browser tab

• Disabling the 'beforeunload' event

How can the 'beforeunload' event be useful in a video player application?

• To automatically play the next video

• To change the video resolution

• To track and save the user's progress

• To increase the video playback speed

What method can be used to save user progress before they leave a page?

• Using a console log

• Making an AJAX request

• Refreshing the page

• Closing the browser