Question 1

What is the following JavaScript code an example of?
Var price;

Accepted Answer

The code "Var price;" is an example of a declaration statement in JavaScript, where a variable named "price" is being declared without assigning it a value.

Question 2

What is the name of the object associated with an entire web page?

Accepted Answer

The "document" object represents the entire web page in the DOM (Document Object Model) and is used to access and manipulate the content and structure of the web page.

Question 3

What is the purpose of adding an autofocus attribute to a text control's input element?

Accepted Answer

The autofocus attribute is used to automatically focus a form control when a page is loaded, placing the cursor in the text control.

Question 4

Which event handler attribute detects whether the value of a form control has changed?

Accepted Answer

The onchange event handler attribute detects whether the value of a form control has changed.

Question 5

Which of the following attribute-value pairs could be used to implement a JavaScript rollover within an img element?

Accepted Answer

The "onmouseover" event is used to trigger a function when the mouse pointer is over an element. Using "this.src" changes the image source of the current element.

Question 6

The text control's placeholder attribute provides a word or a short description that helps the user to know what to enter into the text control.

Accepted Answer

The placeholder attribute in HTML is used to provide a short hint or description in a text input field, guiding users on what to enter.

Question 7

JavaScript is known as a loosely typed language. What does that mean?

Accepted Answer

The answer of JavaScript is known as a loosely typed...

Question 8

Coding conventions suggest using camel case for JavaScript identifiers. What is camel case?

Accepted Answer

The answer of Coding conventions suggest using camel case for...

Question 9

The text control's placeholder and value attributes both provide text that pre-populates the text control's box. What is the difference in terms of what happens when the user starts to enter new text into the box?

Accepted Answer

The answer of The text control's placeholder and value attributes...

Question 10

Every HTML element has innerHTML and outerHTML properties. What is the difference between the two?

Accepted Answer

The answer of Every HTML element has innerHTML and outerHTML...

Question 11

What is a JavaScript event handler?

Accepted Answer

An event handler in JavaScript is a function or code that is executed in response to an event triggered by user actions like clicks, key presses, or other interactions with the web page.

Question 12

Which of the following statements best describes a keyword?

Accepted Answer

A keyword is a reserved word that is part of the JavaScript language and has a special meaning, used to perform specific operations.

Question 13

How can you retrieve an element's object?

Accepted Answer

The getElementById() method returns the element that has the specified ID.

Question 14

Although it is legal to use input elements without surrounding them with a form element, there are advantages to using a form. Which of the following is an advantage of using a form?

Accepted Answer

Using a form allows for easier handling and processing of input data, especially when using JavaScript to manage form submissions and validations.

Question 15

The JavaScript language is basically the same as the Java language, except that JavaScript can be run on the Web and Java cannot be run on the Web.

Accepted Answer

JavaScript and Java are distinct programming languages with different syntax and use cases. JavaScript is primarily used for web development, while Java is a general-purpose programming language that can also be used for web applications through applets or server-side technologies.

Question 16

Ecma International is the standards organization in charge of maintaining the ECMAScript standard.

Accepted Answer

Ecma International is responsible for developing and maintaining the ECMAScript standard, which is the basis for JavaScript and other scripting languages.

Question 17

The following code would be a legal JavaScript identifier: dataFor2Records

Accepted Answer

JavaScript identifiers can include letters, digits, underscores, and dollar signs, and they cannot start with a digit. "dataFor2Records" follows these rules.

Question 18

The following code would be a legal JavaScript identifier: 100Transactions

Accepted Answer

In JavaScript, identifiers cannot start with a digit. They must begin with a letter, underscore (_), or dollar sign ($).

Question 19

In May 1995, Brendan ______ created the JavaScript programming language in 10 days.

Accepted Answer

The answer of In May 1995, Brendan ______ created the...

Question 20

An "argument" refers to a value in a function call's parentheses, and a(n) __________ refers to the associated word in a function definition heading's parentheses.

Accepted Answer

The answer of An "argument" refers to a value in...

Quiz 8: Introduction to Javascript: Functions, Dom, Forms, and Event Handlers

What is the following JavaScript code an example of? Var price;