Chapter 6

Question 1

T/F While JavaScript lets you perform validation in a user’s browser, the server-side programs that receive form data generally perform validation as well

Answer 1

True

Question 2

T/F By default, browsers create an collection of form objects that you can reference using array notation

Answer 2

True

Question 3

T/F Assistive functions perform a type of validation

Answer 3

False

Question 4

T/F You can use HTML to set the default value of a selection list so no option is selected

Answer 4

False

Question 5

T/F Modern browsers can perform many validation tasks themselves without any extra JavaScript

Answer 5

True

Question 6

To check if an option button is selected, you access the value of its BLANK property

Answer 6

checked

Question 7

To display no default value on a selection list, you set its BLANK property to -1

Answer 7

selectedIndex

Question 8

Many aspects of the way browsers present browser-based validation feedback are customizable through the properties and methods of the BLANK

Answer 8

constraint validation API

Question 9

The BLANK event fires when a form is submitted

Answer 9

submit

Question 10

You use the BLANK method on an object to block the action normally associated with an event

Answer 10

preventDefault()

Question 11

The BLANK form element is useful for limiting user options to a set of choices

Answer 11

selection list

Question 12

You create an empty document fragment using the BLANK method

Answer 12

createDocumentFragment()

Question 13

The BLANK attribute enhances usability in modern browsers

Answer 13

placeholder

Question 14

What element property would you use when copying the contents of one text field to another text field

Answer 14

value

Question 15

Which attribute toggles off validation of a form when added to the opening tag?

Answer 15

novalidate

Question 16

Which type value for the input element triggers validation in modern browswers?

Answer 16

number

Question 17

In modern browsers, which attribute of an input element prevents the form from being submitted if the field is left blank

Answer 17

required

Question 18

Validation errors found by modern browsers are reported in BLANK

Answer 18

bubbles

Question 19

In general, modern browsers display validation feedback after the BLANK event is trigged by a form

Answer 19

submit

Question 20

You can use the CSS BLANK pseudo-classes to change the properties of form elements based on their validity status

Answer 20

:invalid and :valid

Question 21

To check a group of fields and trigger an error message if an of them is empty, you use a(n) BLANK statement

Answer 21

loop

Question 22

For any fields that require numeric values, you can use JavaScript’s built-in BLANK function to determine whether a user actually entered a number

Answer 22

isNaN()

Question 23

When a control’s value is found to be invalid during constraint validation, the BLANK event is triggered

Answer 23

invalid

Question 24

Instead of document.getElementsByTagName(“form”)[0], you could use the code

Answer 24

document.forms[0]

Question 25

Use of the BLANK attribute of the form element is not allowed in the strict DTD for XHTML

Answer 25

name

Question 26

BLANK is the process of checking that information provided by users conforms to rules to ensure that it appropriately answers a form's questions and is provided in a format that the site's back-end programs can work with

Answer 26

validation

Question 27

Enhancements to HTML and to modern browsers have allowed browsers themselves to perform many validation tasks without any extra JavaScript. This type of validation is known as BLANK validation

Answer 27

browser-based/native/HTML5 validation

Question 28

Creating a function to validate required fields generally involves retrieving the values of the required fields and checking if the value of any of them is BLANK

Answer 28

an empty string

Question 29

For all custom validation, it can be helpful to use the BLANK structure for handling errors

Answer 29

try/catch

Question 30

To send the values entered in a form to a web server with JavaScript, you use the BLANK method

Answer 30

submit()