QUESTION 1 The ____ method repeatedly executes the same code after being called

Question

QUESTION 1

The ____ method repeatedly executes the same code after being called only once.

setInterval()

clearTimeout()

none of the other answers

clearInterval()

5 points   

QUESTION 2

The ____ property of the Image object allows JavaScript to dynamically change an image.

src

img

path

file

5 points   

QUESTION 3

"The following code ____.

var request = new XMLHttpRequest();
request.open(""GET"", url);
request.onreadystatechange = function() {
if (request.readyState == 4 && request.status == 200) {
document.getElementById( tmpData').innerHTML = request.responseText;
}
};
request.send(null);"

calls a function named readyState to handle the returned Ajax data

puts the returned Ajax data into a html element with ID =  tmpData

calls a function named request to handle the returned Ajax data

displays the returned data in a alert()

5 points   

QUESTION 4

"Given the following, how would you assign Bob's midterm score to a variable?.

var names = [
  {'name':'Alice', 'midterm': '78', 'final': '87'},
  {'name': 'Bob', 'midterm"": '72', 'final': '77'},
  {'name': 'Clare', 'midterm': '91', 'final': '97'},
  {'name': 'Dave', 'midterm': '79', 'final': '85'}
];"

s = names.midterm;

s = names[1].midterm;

s = Bob.midterm;

s = names[2].midterm

5 points   

QUESTION 5

Ajax makes use of the built in ____ object.

XMLRequestHttp

XMLHttpRequest

XMLRequest

HttpRequest

5 points   

QUESTION 6

After an Ajax request is in progress a property named readyState holds an integer that indicates the progress of the data transfer.

True

False

5 points   

QUESTION 7

The ____ method returns the first element in a document with a matching id attribute.

getElementById()

getElementByIdTag()

getElementByName()

getElementByTab()

5 points   

QUESTION 8

Client-side JavaScript is often used to validate HTML form data before it is submitted to the web server.

True

False

5 points   

QUESTION 9

"Consider this code. Which of the following tacks the division onto the end of the page?

x = document.createElement('div');
x.innerHTML =  'All's well that ends well';

document.body.append.x;

"body.appendChild(""div"");"

document.body.add(x);

document.body.appendChild(x);

5 points   

QUESTION 10

"In the following code, #sidebar is a CSS _____.

<style type=""text/css"">
#sidebar {width: 620px;}
.caution {font-size: 12pt; color: blue}
</style>"

class selector

ID selector

none of the other answers

tag selector

5 points   

QUESTION 11

By default an Ajax exchange is ____.

asynchronous

synchronous

delayed by 3 seconds

delayed by 4 seconds

5 points   

QUESTION 12

"To be certain that all images are downloaded into a cache before commencing an animation sequence, you use the ____ event handler of the Image object."

oncache

onload

onopen

onsaved

5 points   

QUESTION 13

The ____ event handler executes when a form is submitted to a server-side script.

onexit

onsubmit

none of the other answers

onsend

5 points   

QUESTION 14

The ____ method returns an array of elements that match a specified tag name.

getElementsByName()

getElementsByTagId()

getElementsByTagName()

getElementsById()

5 points   

QUESTION 15

"How would you get a reference to a HTML element with an id ='p3' ?"

p3 = getElementById();

"x = document.getElementByID('p3');"

x = document.getelementById(p3);

"x = document.getElementById('p3');"

5 points   

QUESTION 16

The purpose of the Ajax same origin policy is to prevent malicious scripts from causing trouble.

True

False

5 points   

QUESTION 17

____ allows JavaScript to store and retrieve an image from memory rather than download the image each time it is needed.

Double buffering

Image refreshing

Image quick loading

Image caching

5 points   

QUESTION 18

"You have a HTML division with an id = 'd5'. How do you assign the string 'That's All, Folks!' to the division's contents?"

"document.getElementsByID('d5').innerHTML = 'That's All, Folks!';"

"document.getElementById('d5').value = 'That's All, Folks!';"

"getElementById('d5').value = 'That's All, Folks!';"

"document.getElementById('d5').innerHTML = 'That's All, Folks!';"

5 points   

QUESTION 19

The HTML form element's _____ attribute determines whether the form makes a GET request or a POST request to the web server.

enctype

accept-charset

action

method

5 points   

QUESTION 20

"In the following code, .caution is a CSS _____.

<style type="text/css">
#sidebar {width: 620px;}
.caution {font-size: 12pt; color: blue}
</style>"

id selector

none of the other answers

tag selector

class selector

setInterval()

clearTimeout()

none of the other answers

clearInterval()

Explanation / Answer

Question 1> Answer = setInterval()

> setInterval(t,function_def) function loops the function_def provided as an argument after time t provided as an argument

> clearInerval() will detroy the setInterval object

> clearTimeout will destroy the setTimeout object

Question 2 > Answer = src

since an img has syntax

<img src="file_path" >

javascript uses src attribute to change the image

Question 3 > Answer = puts the returned Ajax data into a html element with ID = tmpData

readyState is variable whose value is monitored

request in a object sent to browser

there is no alert() function used

Question 4 > Answer = "s = names[1].midterm;"

> names is an array object which contains many json object

> Bob is not an object

> since array indexing starts with 0 , names[1] returns Bobs object and not
names[2]

Question 5 > Answer = XMLHttpRequest

Question 6 > Answer = True

Question 7 > Answer = getElementById()

getElementByIdTag() = returns node List by tag name
      
getElementByName() = returns node List by no
      
getElementByTab() = not a valid syntax

Question 8 > Answer = True

Question 9 > Answer = document.body.appendChild(x);

document.body.append.x; // incorrect syntax , append is a function not object
      
"body.appendChild(""div"");" // div is not object
      
document.body.add(x); // add is no method
      
document.body.appendChild(x); // correct

Question 10 > Anser = ID selector

class selector uses "." dot not Hash "#" , Refer Question 20 at the bottom
tag selector uses tag name

Question 11 > Answer = asynchronous

Question 12 > Answer = onload

Question 13 > Answer = onsubmit

rest option doesnot exist

Question 14 > Answer = getElementsByTagName()

getElementsByTagId() doesnot exist

Question 15 > Answer = "x = document.getElementById('p3');"

p3 = getElementById(); // compilation error
      
"x = document.getElementByID('p3');" // D is capital

x = document.getelementById(p3); // p3 will be read as a variable not value

Question 16 > Answer = True

Question 17 > Answer = Image caching

Question 18 > Answer = document.getElementById('d5').innerHTML = 'That's All, Folks!';"

"getElementById('d5').value = 'That's All, Folks!';" // div doesnt have a value attribute

Question 19 > Answer = method

action // hold the URL of the handler

Question 20 > Answer =    class selector

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