Q
Consider the following JavaScript code: document.addEventListener('keypress', function(event) { console.log('Key pressed:', event.key); }); What does this code do?

Answer & Solution

Answer: Option B
Solution:
The given JavaScript code adds a keypress event listener to the entire document. When a key is pressed while the document has focus, the specified function logs the pressed key's value to the console, allowing developers to handle keyboard input and perform actions based on the keys pressed.
Related Questions on Average

Which statement accurately describes JavaScript event bubbling?

A). A. It refers to the downward propagation of events from parent elements to child elements.

B). B. It refers to the upward propagation of events from child elements to parent elements.

C). C. It refers to the simultaneous firing of multiple events on the same element.

D). D. It refers to the automatic removal of event listeners after an event is triggered.

How can you attach multiple event listeners to the same HTML element in JavaScript without overwriting existing ones?

A). A. By using the attachEvent() method

B). B. By using the addEventListener() method with the replace parameter

C). C. By assigning multiple functions directly to the element's event attributes (e.g., onclick, onmouseover)

D). D. By using the addEventListener() method multiple times for the same event

What is the purpose of the removeEventListener() method in JavaScript?

A). A. To add event listeners to HTML elements

B). B. To detach event listeners from HTML elements

C). C. To prevent event propagation in event handling

D). D. To modify HTML content dynamically

What is the purpose of the onmouseover event in HTML?

A). A. To detect when an element is hovered over

B). B. To track changes in form inputs

C). C. To determine when an element is loaded

D). D. To handle form submissions

Which of the following correctly defines a JavaScript function?

A). A. function addNumbers(num1, num2) { return num1 + num2; }

B). B. function = addNumbers(num1, num2) { return num1 + num2; }

C). C. function addNumbers(num1 + num2) { return num1 + num2; }

D). D. function addNumbers(num1, num2) => { return num1 + num2; }

In JavaScript, what is the purpose of the addEventListener() method?

A). A. To create inline event handlers

B). B. To attach event listeners to HTML elements

C). C. To remove event listeners from HTML elements

D). D. To bind event handlers to parent elements

Which event is triggered when a web page finishes loading?

A). A. onload

B). B. onsubmit

C). C. onmouseover

D). D. onclick

What does the preventDefault() method do in JavaScript event handling?

A). A. Stops event propagation to parent elements

B). B. Prevents the default behavior associated with an event

C). C. Detaches event listeners from elements

D). D. Clears the event queue

What is the purpose of parameters in a JavaScript function?

A). A. To return a value from the function

B). B. To define the function's name

C). C. To store variables within the function

D). D. To accept inputs into the function

Which method is used to remove an event listener from an HTML element in JavaScript?

A). A. removeEventListener()

B). B. detachEvent()

C). C. removeEvent()

D). D. clearEventListener()