Modern JavaScript from the Beginning - Second Edition - The Event Object

The video tutorial covers the event object in JavaScript, explaining its properties and methods. It discusses the differences between target and current target, and introduces event bubbling. The tutorial also explores various event properties, such as type and coordinates, and demonstrates the use of the preventDefault method to stop default actions. Additionally, it shows how dynamic event values can be used, particularly in drag events, to create interactive web applications.

What is the purpose of the event object in JavaScript?

• To store CSS styles

• To handle HTTP requests

• To manage local storage

• To provide information about an event

Which property of the event object refers to the element that triggered the event?

• origin

• target

• source

• currentTarget

How does the 'currentTarget' property differ from 'target'?

• It refers to the element that triggered the event

• It refers to the element where the event listener is attached

• It refers to the parent element

• It refers to the child element

What does the 'type' property of an event object represent?

• The type of the document

• The type of the element

• The type of the browser

• The type of the event

Which property gives the X and Y coordinates of a mouse click relative to the window?

• offsetX and offsetY

• screenX and screenY

• pageX and pageY

• clientX and clientY

What is the purpose of the 'preventDefault' method?

• To stop the event from propagating

• To log the event details

• To change the event type

• To prevent the default action of an event

In which scenario would you use 'preventDefault'?

• To prevent a form from submitting

• To attach an event listener

• To change the background color of an element

• To log the event type

What does the 'clientX' property represent in a drag event?

• The X coordinate relative to the element

• The X coordinate relative to the screen

• The X coordinate relative to the page

• The X coordinate relative to the window

How can you dynamically track the position of an element during a drag event?

• By using the 'screenX' and 'screenY' properties

• By using the 'pageX' and 'pageY' properties

• By using the 'clientX' and 'clientY' properties

• By using the 'offsetX' and 'offsetY' properties

What is a practical application of using dynamic event handling in JavaScript?

• Styling HTML elements

• Developing interactive games

• Managing server-side scripts

• Creating static web pages