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

Question 1

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

A) A declaration statement
B) A variation statement
C) A variable assignment

Answer 1

A

Question 2

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

A) document
B) page
C) div

Answer 2

A

Question 3

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

A) When the web page loads, the browser puts the cursor in the text control.
B) When the user clicks on the text control, the browser generates a pop-up dialog.
C) When the user enters text into the text control, input validation occurs.

Answer 3

A

Question 4

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

A) changed
B) updated
C) onchange
D) onfocus

Question 5

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

A) onchange = "src='sadFace.p n g';"
B) onchange = "this.src='sadFace.p n g';"
C) onmouseover = "src='sadFace.p n g';"
D) onmouseover = "this.src='sadFace.p n g';"

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.

Question 7

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

Question 8

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

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?

Question 10

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

Question 11

What is a JavaScript event handler?

A) The input control that the user interacts with
B) The code that displays the web page when the page first loads
C) The code that executes when the user does something to trigger an event

Question 12

Which of the following statements best describes a keyword?

A) A variable declared by a web programmer
B) A symbol (like + or *) that has a special meaning to the JavaScript language
C) A word that is part of the JavaScript language

Question 13

How can you retrieve an element's object?

A) Call <code>document.getObject (element's-name-value)</code>.
B) Call <code>document.getElementById(element's-id-value)</code>.
C) Refresh the web page.

Question 14

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

A) Forms provide borders by default.
B) Forms provide submit buttons by default.
C) Forms can lead to faster JavaScript processing of the input elements.

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.

Question 16

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

Question 17

The following code would be a legal JavaScript identifier:
<code>dataFor2Records</code>

Question 18

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

Question 19

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

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.

Question 21

Within an event handler function, suppose you have the following code:
Form.elements["title"].value
What does "title" refer to?

A) It is the object associated with the web page's title element.
B) It is the id value for a control in a form.
C) It matches any CSS rules that use the CSS title property.

Question 22

If you are inside a form control, to retrieve the form element's object, you should use:

A) form by itself.
B) this by itself.
C) this.form.
D) form.this.

Question 23

There is a parallel world between HTML element attributes and JavaScript properties, but the naming conventions are slightly different. HTML attributes use camel case, whereas JavaScript properties use all lowercase.

Question 24

A global variable is a variable this is shared among all the functions for a particular web page.

Question 25

Inline JavaScript is when an event handler attribute is assigned JavaScript code that does the work there, rather than in a called function.

Question 26

The default type of control for the input element is a button control.

Question 27

The following JavaScript variable name exhibits proper coding conventions:
$inBank

Question 28

The input element's ______ attribute specifies the button's label.