Consider the following JavaScript code: document.addEventListener('keypress', function(event) { console.log('Key pressed:', event.key); }); What does this code do?
A). A. Adds a click event listener to the document
B). B. Adds a keypress event listener to the document
C). C. Removes a keypress event listener from the document
D). D. Checks if a key is pressed while hovering over an element
Which method is used to attach an event listener to an HTML element in JavaScript?
A). A. appendEvent()
B). B. addEventListener()
C). C. attachEvent()
D). D. bindEvent()
Which type of JavaScript function is defined without a name?
A). A. Named function
B). B. Anonymous function
C). C. Arrow function
D). D. Generator function
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
How can you prevent the default behavior of an event in JavaScript?
A). A. By using the event.preventDefault() method inside the event handler function
B). B. By using the event.stopPropogation() method inside the event handler function
C). C. By using the event.stopPropagation() method inside the event handler function
D). D. By using the event.defaultPrevented property inside the event handler function
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 primary purpose of JavaScript functions?
A). A. To style web pages
B). B. To provide structure to HTML elements
C). C. To create reusable code blocks
D). D. To define CSS styles for HTML
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 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()