Advanced JS Part 1

What does AJAX stand for?

• Asynchronous JavaScript and XML

• Advanced JavaScript and XML

• Automatic JavaScript and XML

• Asynchronous Java and XML

What is the main purpose of AJAX in web development?

• To improve the security of web applications

• To make web pages more visually appealing

• To allow asynchronous communication with the server

• To prevent cross-site scripting attacks

Which JavaScript event is triggered when a user clicks on an HTML element?

• onclick

• onhover

• onsubmit

• onkeyup

What is the correct way to add an event listener to an HTML button with the ID "myButton" in JavaScript?

• getElementById("myButton").addEventListener("click", myFunction);

• document.getElementById("myButton").on("click", myFunction);

• document.getElementById("myButton").addEventListener("onclick", myFunction);

• document.getElement("myButton").onClick = myFunction;

  
  

Which JavaScript event is triggered when a form element loses focus, typically after a user has filled out an input field and clicks away from it?

• onblur

• onchange

• onfocus

• oninput

What is the correct way to add an event listener to the "keydown" event in JavaScript using a function called "handleKeyPress"?

• 
  window.onkeydown(handleKeyPress);

• document.getElementByTagName("body").onkeydown = handleKeyPress;

• document.addEventListener("onkeydown", handleKeyPress);

• window.addEventListener("keydown", handleKeyPress);

Which keyword is used to throw a custom exception in JavaScript?

• try

• catch

• throw

• finally

What is the purpose of the "try" block in JavaScript exception handling?

• To catch and handle exceptions.

• To define a block of code that will be executed if an exception occurs.

• To specify the code that will run regardless of whether an exception occurs or not.

• To throw a custom exception.

What is the purpose of the "catch" block in JavaScript exception handling?

• To define a block of code that will be executed if an exception occurs.

• To catch and handle exceptions.

• To specify the code that will run regardless of whether an exception occurs or not.

• To throw a custom exception.

What is the purpose of the "finally" block in JavaScript exception handling?

• To catch and handle exceptions.

• To define a block of code that will be executed if an exception occurs.

• C) To specify the code that will run regardless of whether an exception occurs or not.

• To throw a custom exception.