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Basic Ajax MCQ

1.
What does the following code do? var xhttp, xmlDoc, txt, x, i; xhttp = new XMLHttpRequest(); xhttp.onreadystatechange = function() { if (this.readyState == 4 && this.status == 200) { xmlDoc = this.responseXML; txt = ""; x = xmlDoc.getElementsByTagName("QUESTION"); for (i = 0; i < x.length; i++) { txt = txt + x[i].childNodes[0].nodeValue + "
"; } document.getElementById("demo").innerHTML = txt; } }; xhttp.open("GET", "questions.xml", true); xhttp.send();

responseXML gets response as HTMLDocument

responseXML gets response as XMLFile

responseXML gets response as XMLDocument

None of the above

Answer

Correct Answer: responseXML gets response as XMLDocument

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2.
How can you send cookies in CORS Ajax call ?

You must set the withCookie flag on the XMLHttpRequest transport. xhr.withCookie = true;

You must set the withCredentials flag on the XMLHttpRequest transport. xhr.withCredentials = true;

You must set the cookies data on the XMLHttpRequest transport. xhr.cookies = {cookie here};

None of the above

Answer

Correct Answer: You must set the withCredentials flag on the XMLHttpRequest transport. xhr.withCredentials = true;

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3.
AJAX is used to create a very _____ web interface.

dynamic

fast

graphically beautiful

static

Answer

Correct Answer: dynamic

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4.
How can you stop jQuery AJAX response from being cached?

Set cache:false in jQuery.ajax() call

Set cache:true in jQuery.ajax() call

Set caching:false in jQuery.ajax() call

None of the above

Answer

Correct Answer: Set cache:false in jQuery.ajax() call

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5.
Which object shares a powerful set of methods that can be used to expedite communications between the client and server?

HttpRequest()

AJAXHttpRequest()

XMLHttpRequest()

JSONHttpRequest()

Answer

Correct Answer: XMLHttpRequest()

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6.
Can the XMLHttpRequest object be disabled via browser settings?

Yes

Can be changed from server

Depends

Answer

Correct Answer: No

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7.
Which of the answers is correct in order to send the following data with request? var requestData = "username=" + escape(document.getElementById("username").value) + "&password=" + escape(document.getElementById("password1").value) + "&firstname=" + escape(document.getElementById("firstname").value) + "&lastname=" + escape(document.getElementById("lastname").value) + "&email=" + escape(document.getElementById("favorite").value);

abcRequest.open("POST", url, true); abcRequest.send(requestData);

abcRequest.open("GET", url, requestData, true); abcRequest.send(null);

abcRequest.open("GET", url, true); abcRequest.send(requestData);

abcRequest.open("POST", url, true); abcRequest.send('requestData');

Answer

Correct Answer: abcRequest.open("POST", url, true); abcRequest.send(requestData);

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8.
Why would a public api return a non valid json like this? for(;;); {"key1":val1,"key2": "val2"}

These strings are commonly referred to as an "unparseable cruft" and are security measures.

It would be a bad HTML not json.

To prevent an XHR attack.

To prevent developers from using eval directly.

Answer

Correct Answer: These strings are commonly referred to as an "unparseable cruft" and are security measures.

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9.
Which of the following parameters to request.open() are correct?

request.open("GET", url, true);

request.open("POST", url, true);

request.open("DELETE", url, true);

request.open("GET", url, "sync");

Answer

Correct Answer: request.open("GET", url, true);
request.open("POST", url, true);

Note: This question has more than 1 correct answers

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10.
Which of the following is true to convert AJAX JSON response into object?

eval(' + request.responseText + ');

eval('{' + request.responseText + '}');

eval(request.responseText);

eval('(' + request.responseText + ')');

Answer

Correct Answer: eval(' + request.responseText + ');

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11.
Which of the following is true about asynchronous request?

Allow the user to keep working while request is taking place

User has to wait while request is taking place

While loading page browser always makes asynchronous request

Asynchronous request can only be executed using javascript

Answer

Correct Answer: User has to wait while request is taking place

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12.
Which of the following is the correct way to disable register button while request is processing?

document("register").disabled = true;

document.getElementById("register").active = true;

document.getElementById("register") = true;

document.getElementById("register").disabled = true;

Answer

Correct Answer: document.getElementById("register").disabled = true;

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13.
To check if DOM element 'currentDiv' don't have any child nodes, we can use which one of the following conditions?

currentDiv.childNodes.length == 0

currentDiv.childNodes.true == 0

currentDiv.childNodesPresent == 0

currentDiv.isChildNodes == 0

Answer

Correct Answer: currentDiv.childNodes.length == 0

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14.
Which of the following methods is NOT supported by the XMLHttpRequest object?

open

quit

send

None of the above

Answer

Correct Answer: quit

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15.
By default, browsers do not support cross domain AJAX requests.

True

False

Answer

Correct Answer: False

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16.
Which of the following statement best describes the below code (function worker() { $.ajax({ url: 'ajax/test.html', success: function(data) { $('.result').html(data); }, complete: function() { setTimeout(worker, 5000); } }); })();

Syntax error

Periodically performs an ajax request

performs an ajax request once

None of the above

Answer

Correct Answer: Periodically performs an ajax request

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17.
For the following code fragment function Foo() { this.data = 42, document.body.onclick = this.method.bind(this); } Foo.prototype.method = function() { console.log(this.data); }; choose the option that shows the output to the console log

undefined

Evalerror

Referenceerror

Answer

Correct Answer: 42

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18.
The readyState property in onreadystatechange event equal to 1 means ?

processing request

server connection established

request received

request finished and response is ready

Answer

Correct Answer: server connection established

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19.
for the code fragment below $.ajax({ type: 'POST', url: 'submit1.php', data: $("#regist").serialize(), dataType: 'json', success: function() { // code here} }); Choose the statement that best describes the role of the success ‘key’

Defines an AJAX callback

Defines an AJAX asynchronous callback

Defines an AJAX callback for a response with status code 200

Defines an AJAX callback with content type application/json

Answer

Correct Answer: Defines an AJAX callback for a response with status code 200

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20.
Which of the following will not execute request asynchronously provided usernameRequest object already exists?

usernameRequest.open("GET", "abc.php", true); usernameRequest.send(null);

usernameRequest.open("GET", "abc.php", false); usernameRequest.send(null);

usernameRequest.open("POST", "abc.php", true); usernameRequest.send(null); usernameRequest.open("GET", "abc.php", true);

usernameRequest.send("fname=John&lname=Alice");

Answer

Correct Answer: usernameRequest.open("GET", "abc.php", false); usernameRequest.send(null);

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21.
Choose the best statement for the expression JSON.stringify(jsObj);

Will fail if the browser lacks native JSON serialization

Will fail without Crockford's json2.js libary

Will fail without jQuery libary

Will fail if called before 'window.onLoad'

Answer

Correct Answer: Will fail if the browser lacks native JSON serialization

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22.
What does the status == 404 means ?

the Ajax call to the page was not found

the Ajax call to the page is success

the Ajax call to the page have internal error

the Ajax call to the page is redirected

Answer

Correct Answer: the Ajax call to the page was not found

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23.
In an ajax request function callback you have the following code $('#childdiv').html(data); choose the most probable reason why a previous delegated 'click' event no longer functions

If you do use event delegation, you must bind to a non-changing parent element.

Ajax callback is not implemented

You need to trigger UI actions in between ajax calls

You need to call document.onload to refresh the dom

Answer

Correct Answer: If you do use event delegation, you must bind to a non-changing parent element.

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24.
Which of the following object.method is responsible for writing text to current web page?

window.write

document.write

XMLHttpRequest.write

history.write

Answer

Correct Answer: document.write

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25.
Which of the following can be used to display 'inProcess.png' image while processing request?

document.getElementById("status").image = url("inProcess.png");

document.getElementById("status").innerHTML = url("inProcess.png");

document.getElementById("status").src = "inProcess.png";

document.getElementById("status").attribute= "inProcess.png";

Answer

Correct Answer: document.getElementById("status").src = "inProcess.png";

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26.
Which of the following will change the class of XHTML element having ID of 'username'?

document.getElementById("username").class = "approved";

document.getElementById("username").className = "approved";

document.getElementsByClassName("username").className = "approved";

document.getElementsByTagName("username").className = "approved";

Answer

Correct Answer: document.getElementById("username").className = "approved";

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27.
What is wrong in the following function ? function loadDoc() { varxhttp = new XMLHttpRequest(); xhttp.onreadystatechange = function() { if (this.readyState == 3 &&this.status == 200) { console.log(this.responseText); } }; xhttp.open("GET", "cd_catalog.xml", true); xhttp.send(); }

In line 4, the comparison of this.status should be with 404

In line 4, the comparison of this.readyState should be with 4

Both 1 and 2

None of the above

Answer

Correct Answer: In line 4, the comparison of this.readyState should be with 4

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28.
Which of the following are not 'document' object methods?

document.createElement()

document.removeChild()

document.replaceChild(element)

document.replace(element)

Answer

Correct Answer: document.replace(element)

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29.
Choose the best answer to describe ‘Deferred objects’

A future value object

A response to a JSONP request

A response to a XMLHTTPRequest

jQuery's custom implementation of promises

Answer

Correct Answer: jQuery's custom implementation of promises

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30.
Which of the following methods are used for cross domain AJAX calls?

CORS

JSONP

Both of the above

None of the above

Answer

Correct Answer: Both of the above

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31.
For the code fragment function x(a,b,e,d,c){ c=new XMLHttpRequest; c.open(e||'get',a); c.onload=b; c.onerror=error; c.send(d||null) } Choose the option that best describes the parameter d

Form data

A callback

A url

data

Answer

Correct Answer: Form data

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32.
Can we make a HTTP POST Ajax call?

Yes, set method param of open() function to POST

Yes but POST can not run in all browsers

Answer

Correct Answer: Yes, set method param of open() function to POST

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33.
For the code fragment below, function ajax(a,b,c) { c=new XMLHttpRequest; c.open('GET',a); c.onload=b; c.send() } Choose the option that best describes the parameter c

A callback

A promise

A variable definition

A response

Answer

Correct Answer: A variable definition

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34.
Which of the following is NOT a valid method in the key/value pair to configure ajax request in jquery.ajax()?

complete

pass

success

error

Answer

Correct Answer: pass

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35.
What does the getAllResponseHeaders() function do ?
varxhttp = new XMLHttpRequest(); xhttp.onreadystatechange = function() { if (this.readyState == 4 &&this.status == 200) { console.log(this.getAllResponseHeaders()); } }; xhttp.open("GET", "ajax_info.txt", true); xhttp.send();

Get all request headers of Ajax call

Get all body content of Ajax call

Get all response headers of Ajax call

None of the above

Answer

Correct Answer: Get all response headers of Ajax call

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36.
For the following code fragment function Foo() { this.data = 42, document.body.onclick = this.method; } Foo.prototype.method = function() { console.log(this.data); }; choose the option that shows the output to the console log

undefined

Null

error

Answer

Correct Answer: undefined

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37.
For the following code fragment foo(function(r) { // code }); Choose the correct description of the ‘function(r)’

An Asynchronus function

A closure

A callback

A nested function

Answer

Correct Answer: A callback

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38.
Which of the following methods can be used to assign multiple event handlers?

addEventHandler()

addEvent()

createEvent()

addEventListener()

Answer

Correct Answer: addEventListener()

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39.
Which of the following XMLHttpRequest Object method returns all the header information?

getHeaders()

getResponseHeaders()

getAllResponseHeaders()

getAllHeaders()

Answer

Correct Answer: getAllResponseHeaders()

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40.
Which of the following is correct for the term 'Progressive enhancement'? (choose all that apply)

A design that will not work on low-capability browsers

A design that allows operation at a at a reduced level of performance after browser failures

Progressive enhancement allows everyone to access the basic content and functionality of a web page, using any browser or Internet connection, while also providing an enhanced version of the page to those with more advanced browser software or greater bandwidth.

The reverse of 'Graceful Degradation'

Answer

Correct Answer: Progressive enhancement allows everyone to access the basic content and functionality of a web page, using any browser or Internet connection, while also providing an enhanced version of the page to those with more advanced browser software or greater bandwidth.
The reverse of 'Graceful Degradation'

Note: This question has more than 1 correct answers

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41.
Which of the following are General HTTP headers?

Connection

Date

Mime-Version

Trailer

Answer

Correct Answer: Connection
Date
Mime-Version
Trailer

Note: This question has more than 1 correct answers

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42.
Which of the following are HTTP response headers?

Age

Public

Retry

Retry-After

Answer

Correct Answer: Age
Public
Retry-After

Note: This question has more than 1 correct answers

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43.
The responseText or responseXML property of the XMLHttpRequest ____?

object

url

method

Answer

Correct Answer: object

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44.
For the code fragment below function foo() { var httpRequest = new XMLHttpRequest(); httpRequest.open('GET', "/echo/json"); httpRequest.send(); return httpRequest.responseText; } var result = foo(); What will be the value of ‘result’

Null

Undefined

A Promise

Char array

Answer

Correct Answer: Undefined

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45.
The browser will put 'text' that the server returns in which of the following Request Object property?

response

responseText

statustext

text

Answer

Correct Answer: responseText

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46.
Fill the correct blanks in following code: Function processXhrChange() { // Check readyState to make sure the XMLHttpRequest has been fully loaded if (Xhr.readyState == ) { // Check status code from server for "OK" if ( Xhr.status == ) { // Process incoming data // Update our hit counter Hit = hit + 1; } else { // Request had a status code other than 200 Alert ("There was a problem communicating with the server\n"); } }

2 200

4 200

3 300

0 200

Answer

Correct Answer: 4 200

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47.
Which of the following property of XMLHttpRequest object holds its status?

Status

State

readyState

readyStatus

Answer

Correct Answer: readyState

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48.
Can ActiveXObject work on browsers like Chrome and Firefox?

Yes. ActiveX can work on all browsers

No, ActiveX is only supported by IE - the other browsers use a plugin architecture called NPAPI

ActiveX can work on Chrome but not on Firefox

ActiveX can work on Firefox but not on Chrome

Answer

Correct Answer: No, ActiveX is only supported by IE - the other browsers use a plugin architecture called NPAPI

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49.
Which of the following statements is true about following code? $.ajax({ method: "GET", url: "test.js", dataType: "script" });

Invalid AJAX request

Load JavaScript file but does not execute it

Load and execute the JavaScript file

None of the above

Answer

Correct Answer: Load and execute the JavaScript file

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50.
Which of the following method can be used to delete node from DOM tree?

deleteNode()

removeNode()

deleteObject()

Answer

Correct Answer: removeNode()

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51.
Which of the following numbers, in callback function of request object, can be tested against request.readyState to make sure that server has finished processing request?

Answer

Correct Answer: 4

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52.
Which of the following jQuery AJAX function is used to set default values for future AJAX requests?

jQuery.ajaxSetup()

jQuery.ajaxSend()

jQuery.ajaxDefault()

None of the above

Answer

Correct Answer: jQuery.ajaxSetup()

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53.
Which of the following is true for asynchronous requests and response?

Never count on the ORDER or SEQUENCE of requests and responses in asynchronous applications.

If you’re making TWO separate requests, use TWO separate request objects.

Asynchronous request and response received are in sequence.

Same Request Object can be used for two separate.

Answer

Correct Answer: Never count on the ORDER or SEQUENCE of requests and responses in asynchronous applications.
If you’re making TWO separate requests, use TWO separate request objects.

Note: This question has more than 1 correct answers

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54.
Which of the following javascript functions can be used to convert JSON string into object?

JSON.convert()

JSON.parse()

JSON.object()

JSON.string()

Answer

Correct Answer: JSON.parse()

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55.
Which of the following benefits can AJAX provide to Web Applications?

The browser can request multiple things from the server at the same time.

Browser requests return a lot faster.

Colors are rendered more faithfully.

Only the parts of the page that actually change are updated.

Answer

Correct Answer: The browser can request multiple things from the server at the same time.
Browser requests return a lot faster.
Only the parts of the page that actually change are updated.

Note: This question has more than 1 correct answers

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56.
Which of the following is the correct way to assign events to HTML elements using JavaScript?

document.onclick = functionName;

window.onload = functionName;

Events can't be assigned using javascript

document.getElementById("Btn").onclick = functionName;

Answer

Correct Answer: document.getElementById("Btn").onclick = functionName;

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57.
Which of the following request object method can be assigned a callback function which will be called every time the server updates the browser on the request its processing?

request.onstatechange

request.onreadystatechange

request.statechange

request.onstatuschange

Answer

Correct Answer: request.onreadystatechange

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58.
How to use Basic Auth with jQuery and AJAX?aja

Use username and password attribute with the $.ajax call

Use the beforeSend callback to add a HTTP header with the authentication information

Both of the above

None of the above

Answer

Correct Answer: Both of the above

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59.
Which of the following may be a disadvantage of using AJAX?

Security

Search Engine Indexing

Accessibility Issues

All of the above

Answer

Correct Answer: All of the above

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60.
Which of the following is not supported in AJAX?

CSS

Flash

None of these

Answer

Correct Answer: Flash

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61.
How to make a cross-domain Ajax call?

By using JSONP

By using CORS

By using both JSONP and CORS

None of the above

Answer

Correct Answer: By using both JSONP and CORS

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62.
Which of the following is true about jQuery.get() method?

Load data from the server using an HTTP GET request

Load data from the server using an HTTP POST request

Both of the above

None of the above

Answer

Correct Answer: Load data from the server using an HTTP GET request

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63.
Which one of these technologies is NOT used in AJAX?

CSS

DOM

JavaScript

Flash

Answer

Correct Answer: Flash

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64.
Your ajax requests are giving you cross site scripting issues, choose the best method below to get around this

Run a proxy script on your own server that fetches the content from the external site and pipes it back to the browser

Use an iframe for the ajax requests

Use JSONP for both GET and POST requests

Explicitly use the XmlHttpRequest object

Answer

Correct Answer: Run a proxy script on your own server that fetches the content from the external site and pipes it back to the browser

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65.
How do you know that an AJAX request has completed?

XHR.readyState is 1 and the XHR.status is 200

XHR.readyState is 2 and the XHR.status is 200

XHR.readyState is 4 and the XHR.status is 400

XHR.readyState is 4 and the XHR.status is 200

Answer

Correct Answer: XHR.readyState is 4 and the XHR.status is 200

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66.
After all referenced files are loaded and parsed, the browser triggers the _____ event?

document.init

windows.init

window.onload

document.onload

Answer

Correct Answer: window.onload

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67.
For the following code fragment object.property(); choose the option that is correct

When you get the property from the object and call it in one go, the window will be the context for the method

If you call the property() method, but in separate steps, the context is the object

When you get the property from the object and call it in one go, the object will be the context for the method

When you get the property from the object , t he context is the global scope

Answer

Correct Answer: When you get the property from the object and call it in one go, the object will be the context for the method

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68.
What is the correct way to implement GET request using AJAX?

xhttp.open(“GET”, “demo_get.asp”, true); xhttp.send();

xhttp.open(“GET”, “demo_get.asp”, true); xhttp.post();

xhttp.open(“POST”, “demo_get.asp”, true); xhttp.send();

None of the above

Answer

Correct Answer: xhttp.open(“GET”, “demo_get.asp”, true); xhttp.send();

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69.
Which of the following callback hooks is not provided by jQuery AJAX?

beforeSend

error

dataFilter

success

finish

complete

Answer

Correct Answer: finish

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70.
Which of the following are valid for addEventListener() method?

Attaches an event handler to the specified element.

Attaches an event handler to an element without overwriting existing event handlers.

Can add many event handlers of the same type to one element, i.e two "click" events.

Makes it easier to control how the event reacts to bubbling.

All of the above

Answer

Correct Answer: All of the above

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71.
This __ event tells the browser to call the checkUsername() function when the user leaves the username field on the form.

onleave

onblur

onexit

onnext

Answer

Correct Answer: onblur

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72.
.................... stores a function (or the name of a function) to be called automatically each time the readyState property changes.

onreadystatechange

readyState

status

All of the above

Answer

Correct Answer: onreadystatechange

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73.
Which of the following statements are true for AJAX graceful degradation?

Start out by designing a JavaScript-free site.

Use elements and Submit buttons

Write server-side programs that don’t assume Ajaxian requests.

Basic Ajax MCQ

2. How can you send cookies in CORS Ajax call ?

3. AJAX is used to create a very _____ web interface.

4. How can you stop jQuery AJAX response from being cached?

5. Which object shares a powerful set of methods that can be used to expedite communications between the client and server?

6. Can the XMLHttpRequest object be disabled via browser settings?

8. Why would a public api return a non valid json like this? for(;;); {"key1":val1,"key2": "val2"}

9. Which of the following parameters to request.open() are correct?

10. Which of the following is true to convert AJAX JSON response into object?

11. Which of the following is true about asynchronous request?

12. Which of the following is the correct way to disable register button while request is processing?

13. To check if DOM element 'currentDiv' don't have any child nodes, we can use which one of the following conditions?

14. Which of the following methods is NOT supported by the XMLHttpRequest object?

15. By default, browsers do not support cross domain AJAX requests.

16. Which of the following statement best describes the below code (function worker() { $.ajax({ url: 'ajax/test.html', success: function(data) { $('.result').html(data); }, complete: function() { setTimeout(worker, 5000); } }); })();

17. For the following code fragment function Foo() { this.data = 42, document.body.onclick = this.method.bind(this); } Foo.prototype.method = function() { console.log(this.data); }; choose the option that shows the output to the console log

18. The readyState property in onreadystatechange event equal to 1 means ?

19. for the code fragment below $.ajax({ type: 'POST', url: 'submit1.php', data: $("#regist").serialize(), dataType: 'json', success: function() { // code here} }); Choose the statement that best describes the role of the success ‘key’

20. Which of the following will not execute request asynchronously provided usernameRequest object already exists?

21. Choose the best statement for the expression JSON.stringify(jsObj);

22. What does the status == 404 means ?

23. In an ajax request function callback you have the following code $('#childdiv').html(data); choose the most probable reason why a previous delegated 'click' event no longer functions

24. Which of the following object.method is responsible for writing text to current web page?

25. Which of the following can be used to display 'inProcess.png' image while processing request?

26. Which of the following will change the class of XHTML element having ID of 'username'?

27. What is wrong in the following function ? function loadDoc() { varxhttp = new XMLHttpRequest(); xhttp.onreadystatechange = function() { if (this.readyState == 3 &&this.status == 200) { console.log(this.responseText); } }; xhttp.open("GET", "cd_catalog.xml", true); xhttp.send(); }

28. Which of the following are not 'document' object methods?

29. Choose the best answer to describe ‘Deferred objects’

30. Which of the following methods are used for cross domain AJAX calls?

31. For the code fragment function x(a,b,e,d,c){ c=new XMLHttpRequest; c.open(e||'get',a); c.onload=b; c.onerror=error; c.send(d||null) } Choose the option that best describes the parameter d

32. Can we make a HTTP POST Ajax call?

33. For the code fragment below, function ajax(a,b,c) { c=new XMLHttpRequest; c.open('GET',a); c.onload=b; c.send() } Choose the option that best describes the parameter c

34. Which of the following is NOT a valid method in the key/value pair to configure ajax request in jquery.ajax()?

35. What does the getAllResponseHeaders() function do ? varxhttp = new XMLHttpRequest(); xhttp.onreadystatechange = function() { if (this.readyState == 4 &&this.status == 200) { console.log(this.getAllResponseHeaders()); } }; xhttp.open("GET", "ajax_info.txt", true); xhttp.send();

36. For the following code fragment function Foo() { this.data = 42, document.body.onclick = this.method; } Foo.prototype.method = function() { console.log(this.data); }; choose the option that shows the output to the console log

37. For the following code fragment foo(function(r) { // code }); Choose the correct description of the ‘function(r)’

38. Which of the following methods can be used to assign multiple event handlers?

39. Which of the following XMLHttpRequest Object method returns all the header information?

40. Which of the following is correct for the term 'Progressive enhancement'? (choose all that apply)

41. Which of the following are General HTTP headers?

42. Which of the following are HTTP response headers?

43. The responseText or responseXML property of the XMLHttpRequest ____?

44. For the code fragment below function foo() { var httpRequest = new XMLHttpRequest(); httpRequest.open('GET', "/echo/json"); httpRequest.send(); return httpRequest.responseText; } var result = foo(); What will be the value of ‘result’

45. The browser will put 'text' that the server returns in which of the following Request Object property?

47. Which of the following property of XMLHttpRequest object holds its status?

48. Can ActiveXObject work on browsers like Chrome and Firefox?

49. Which of the following statements is true about following code? $.ajax({ method: "GET", url: "test.js", dataType: "script" });

50. Which of the following method can be used to delete node from DOM tree?

51. Which of the following numbers, in callback function of request object, can be tested against request.readyState to make sure that server has finished processing request?

52. Which of the following jQuery AJAX function is used to set default values for future AJAX requests?

53. Which of the following is true for asynchronous requests and response?

54. Which of the following javascript functions can be used to convert JSON string into object?

55. Which of the following benefits can AJAX provide to Web Applications?

56. Which of the following is the correct way to assign events to HTML elements using JavaScript?

57. Which of the following request object method can be assigned a callback function which will be called every time the server updates the browser on the request its processing?

58. How to use Basic Auth with jQuery and AJAX?aja

59. Which of the following may be a disadvantage of using AJAX?

60. Which of the following is not supported in AJAX?

61. How to make a cross-domain Ajax call?

62. Which of the following is true about jQuery.get() method?

63. Which one of these technologies is NOT used in AJAX?

64. Your ajax requests are giving you cross site scripting issues, choose the best method below to get around this

65. How do you know that an AJAX request has completed?

66. After all referenced files are loaded and parsed, the browser triggers the _____ event?

67. For the following code fragment object.property(); choose the option that is correct

68. What is the correct way to implement GET request using AJAX?

69. Which of the following callback hooks is not provided by jQuery AJAX?

70. Which of the following are valid for addEventListener() method?

71. This __ event tells the browser to call the checkUsername() function when the user leaves the username field on the form.

72. .................... stores a function (or the name of a function) to be called automatically each time the readyState property changes.

73. Which of the following statements are true for AJAX graceful degradation?

74. If an AJAX request made using jQuery fails,

75. How does Crockford's json2.js libary support Graceful Degradation?

76. Choose the most correct statement to describe Graceful Degradation.

77. Which of the following are HTTP request headers?

78. Which of the following is not a callback hooks provided by $.ajax()?

79. What is the difference between XMLHttpRequest and ActiveXObject? variable = new XMLHttpRequest(); variable = new ActiveXObject("Microsoft.XMLHTTP");

80. How many status of the XMLHttpRequest are there?

81. Which of the following JavaScript DOM traversal method works with an XML Document object?

82. Which of the following JavaScript DOM traversal methods work with an XML Document object?

2.
How can you send cookies in CORS Ajax call ?

3.
AJAX is used to create a very _____ web interface.

4.
How can you stop jQuery AJAX response from being cached?

5.
Which object shares a powerful set of methods that can be used to expedite communications between the client and server?

6.
Can the XMLHttpRequest object be disabled via browser settings?

8.
Why would a public api return a non valid json like this? for(;;); {"key1":val1,"key2": "val2"}

9.
Which of the following parameters to request.open() are correct?

10.
Which of the following is true to convert AJAX JSON response into object?

11.
Which of the following is true about asynchronous request?

12.
Which of the following is the correct way to disable register button while request is processing?

13.
To check if DOM element 'currentDiv' don't have any child nodes, we can use which one of the following conditions?

14.
Which of the following methods is NOT supported by the XMLHttpRequest object?

15.
By default, browsers do not support cross domain AJAX requests.

16.
Which of the following statement best describes the below code (function worker() { $.ajax({ url: 'ajax/test.html', success: function(data) { $('.result').html(data); }, complete: function() { setTimeout(worker, 5000); } }); })();

17.
For the following code fragment function Foo() { this.data = 42, document.body.onclick = this.method.bind(this); } Foo.prototype.method = function() { console.log(this.data); }; choose the option that shows the output to the console log

18.
The readyState property in onreadystatechange event equal to 1 means ?

19.
for the code fragment below $.ajax({ type: 'POST', url: 'submit1.php', data: $("#regist").serialize(), dataType: 'json', success: function() { // code here} }); Choose the statement that best describes the role of the success ‘key’

20.
Which of the following will not execute request asynchronously provided usernameRequest object already exists?

21.
Choose the best statement for the expression JSON.stringify(jsObj);

22.
What does the status == 404 means ?

23.
In an ajax request function callback you have the following code $('#childdiv').html(data); choose the most probable reason why a previous delegated 'click' event no longer functions

24.
Which of the following object.method is responsible for writing text to current web page?

25.
Which of the following can be used to display 'inProcess.png' image while processing request?

26.
Which of the following will change the class of XHTML element having ID of 'username'?

27.
What is wrong in the following function ? function loadDoc() { varxhttp = new XMLHttpRequest(); xhttp.onreadystatechange = function() { if (this.readyState == 3 &&this.status == 200) { console.log(this.responseText); } }; xhttp.open("GET", "cd_catalog.xml", true); xhttp.send(); }

28.
Which of the following are not 'document' object methods?

29.
Choose the best answer to describe ‘Deferred objects’

30.
Which of the following methods are used for cross domain AJAX calls?

31.
For the code fragment function x(a,b,e,d,c){ c=new XMLHttpRequest; c.open(e||'get',a); c.onload=b; c.onerror=error; c.send(d||null) } Choose the option that best describes the parameter d

32.
Can we make a HTTP POST Ajax call?

33.
For the code fragment below, function ajax(a,b,c) { c=new XMLHttpRequest; c.open('GET',a); c.onload=b; c.send() } Choose the option that best describes the parameter c

34.
Which of the following is NOT a valid method in the key/value pair to configure ajax request in jquery.ajax()?

35.
What does the getAllResponseHeaders() function do ?
varxhttp = new XMLHttpRequest(); xhttp.onreadystatechange = function() { if (this.readyState == 4 &&this.status == 200) { console.log(this.getAllResponseHeaders()); } }; xhttp.open("GET", "ajax_info.txt", true); xhttp.send();

36.
For the following code fragment function Foo() { this.data = 42, document.body.onclick = this.method; } Foo.prototype.method = function() { console.log(this.data); }; choose the option that shows the output to the console log

37.
For the following code fragment foo(function(r) { // code }); Choose the correct description of the ‘function(r)’

38.
Which of the following methods can be used to assign multiple event handlers?

39.
Which of the following XMLHttpRequest Object method returns all the header information?

40.
Which of the following is correct for the term 'Progressive enhancement'? (choose all that apply)

41.
Which of the following are General HTTP headers?

42.
Which of the following are HTTP response headers?

43.
The responseText or responseXML property of the XMLHttpRequest ____?

44.
For the code fragment below function foo() { var httpRequest = new XMLHttpRequest(); httpRequest.open('GET', "/echo/json"); httpRequest.send(); return httpRequest.responseText; } var result = foo(); What will be the value of ‘result’

45.
The browser will put 'text' that the server returns in which of the following Request Object property?

47.
Which of the following property of XMLHttpRequest object holds its status?

48.
Can ActiveXObject work on browsers like Chrome and Firefox?

49.
Which of the following statements is true about following code? $.ajax({ method: "GET", url: "test.js", dataType: "script" });

50.
Which of the following method can be used to delete node from DOM tree?

51.
Which of the following numbers, in callback function of request object, can be tested against request.readyState to make sure that server has finished processing request?

52.
Which of the following jQuery AJAX function is used to set default values for future AJAX requests?

53.
Which of the following is true for asynchronous requests and response?

54.
Which of the following javascript functions can be used to convert JSON string into object?

55.
Which of the following benefits can AJAX provide to Web Applications?

56.
Which of the following is the correct way to assign events to HTML elements using JavaScript?

57.
Which of the following request object method can be assigned a callback function which will be called every time the server updates the browser on the request its processing?

58.
How to use Basic Auth with jQuery and AJAX?aja

59.
Which of the following may be a disadvantage of using AJAX?

60.
Which of the following is not supported in AJAX?

61.
How to make a cross-domain Ajax call?

62.
Which of the following is true about jQuery.get() method?

63.
Which one of these technologies is NOT used in AJAX?

64.
Your ajax requests are giving you cross site scripting issues, choose the best method below to get around this

65.
How do you know that an AJAX request has completed?

66.
After all referenced files are loaded and parsed, the browser triggers the _____ event?

67.
For the following code fragment object.property(); choose the option that is correct

68.
What is the correct way to implement GET request using AJAX?

69.
Which of the following callback hooks is not provided by jQuery AJAX?

70.
Which of the following are valid for addEventListener() method?

71.
This __ event tells the browser to call the checkUsername() function when the user leaves the username field on the form.

72.
.................... stores a function (or the name of a function) to be called automatically each time the readyState property changes.

73.
Which of the following statements are true for AJAX graceful degradation?

74.
If an AJAX request made using jQuery fails,

75.
How does Crockford's json2.js libary support Graceful Degradation?

76.
Choose the most correct statement to describe Graceful Degradation.

77.
Which of the following are HTTP request headers?

78.
Which of the following is not a callback hooks provided by $.ajax()?

79.
What is the difference between XMLHttpRequest and ActiveXObject? variable = new XMLHttpRequest(); variable = new ActiveXObject("Microsoft.XMLHTTP");

80.
How many status of the XMLHttpRequest are there?

81.
Which of the following JavaScript DOM traversal method works with an XML Document object?

82.
Which of the following JavaScript DOM traversal methods work with an XML Document object?

83.
To get a list of all elements with class="intro" which of the following can be used?