Deck 12: Introduction to Jquery

Question 1

Each jQuery method serves a single function, allowing you to either look up a value or set that value, but not both.

Answer 1

False

Question 2

jQuery is a cross-browser library.

Answer 2

True

Question 3

Both private and free, publicly available JavaScript libraries are in common use on the web today.

Answer 3

True

Question 4

Every jQuery statement begins with which character?

A)$
B).
C)@
D)#

Question 5

The ____ method selects the child elements of each element matched by the main selector.

A) next()
B)last()
C)previous()
D) children()

Question 6

Why would you link to a jQuery file on a CDN?

A)It's the only way to ensure that you're using the most current version.
B)It can provide an improved user experience.
C)It's cheaper than linking to a file on your own web server.
D)It's the only way to include the library in your web documents.

Question 7

The ____ method changes the selection to the sibling element immediately following each selected element.

A) next()
B)last()
C)previous()
D) children()

Question 8

Which of the following is NOT an acceptable value for referencing the element(s)on which a jQuery statement operates?

A)a variable
B)a CSS selector
C)a JavaScript method
D)the this keyword

Question 9

jQuery 2.x supports IE 6, 7, and 8.

Question 10

You can include the jQuery library by specifying the location in your HTML document of a jQuery file on a publicly accessible server.

Question 11

To select elements in jQuery, you specify a(n)____ .

A)CSS selector
B)getElementById() method
C)array
D)JSON string

Question 12

Some jQuery animation methods allow you to specify the keywords ____ to set the speed of the animation.

A) slow and fast
B) tortoise  and  hare
C) stop  and  go
D) walk  and  run

Question 13

jQuery includes a(n)____ method that allows jQuery code to coexist with code for another library that uses the same alias.

A)alias()
B) sharedAlias()
C)conflict()
D) noConflict()

Question 14

In a jQuery statement, a reference to the elements on which the statement operates is contained in ____.

A){ }
B)[ ]
C)< >
D)( )

Question 15

Which character do you use to append a jQuery method to code that selects elements?

A):
B).
C)-
D)=

Question 16

The ____ method retrieves the value of the first element in the selection, or sets the value of the selected elements.

A) height()
B)addClass()
C)width()
D) val()

Question 17

Which jQuery method narrows the group of selected elements to the first element?

A)previous()
B)next()
C)first()
D) last()

Question 18

What is the extension of the file that contains the jQuery library?

A).html
B).css
C).js
D).jq

Question 19

Which jQuery method narrows the group of selected elements to the last element?

A)previous()
B)next()
C)first()
D) last()

Question 20

The ____ method adds specified class name(s)to the selection.

A) height()
B)addClass()
C)width()
D) val()

Question 21

All jQuery animation methods can take a value in __________ as an argument.

Question 22

The jQuery __________ event specifies code to execute then the pointer enters an element, as well as code to execute when the pointer leaves the element.

Question 24

Explain why libraries are useful in JavaScript.

Question 25

Servers known as __________ are optimized for quick delivery of files across the globe.

Question 26

What action does a jQuery event method perform if it is called with empty parentheses?

A)It fires the indicated event.
B)It removes any matching event listener on the selection.
C)It creates an event listener on the window object.
D)It does nothing.

Question 27

What language is the jQuery library written in?

A)PHP
B)HTML
C)JavaScript
D)CSS

Question 28

Which is the correct syntax to create a function that uses jQuery?

A)$.function name() {}
B)$(name()).function {}
C)$(function) name() {}
D)function name() {}

Question 29

Is jQuery a different language from JavaScript? Explain.

Question 30

In what situations might you be better off not using jQuery?

Question 31

Explain the relationship between the syntax for selecting an element in jQuery and the querySelectorAll()method.

Question 32

Explain the different roles of an event method based on whether the parentheses are empty.

Question 33

The jQuery __________ method changes an element's display value to its default value.

Question 34

Describe two differences between jQuery 1.x and jQuery 2.x?.

Question 35

Which is an advantage of using jQuery animation methods rather than coding animations yourself in JavaScript?

A)Coding the animations yourself might require writing and debugging many lines of JavaScript.
B)The jQuery animation effects cannot be created with plain JavaScript.
C)You cannot select certain web page elements without using jQuery.
D)There is no particular advantage to using one or the other.

Question 36

What are the three parts of an event listener created with jQuery?

Question 37

Which jQuery method do you use to add a class name to one ore more selected elements?

A)html()
B)removeClass()
C) addClass()
D)clone()

Question 38

When your HTML document links to both the jQuery library and another JavaScript file, which order should the links be in? Why?

Question 39

The jQuery __________ method changes an element's display value to none .

Question 40

What is an advantage of using jQuery to create a feature such as a drop-down menu, rather than writing plain JavaScript code for this feature?

Question 41

Provide a jQuery statement that shows all children of h2 elements.