Ajax MCQs (Chapterwise Multiple Choice Questions)

Which readystate value indicates the response has been fully received from the asynchronous request?

1 (readystate received)

true (response received)

4 (readystate complete)

"OK" (response good)

200 (response OK)

Answer & Explanation

Correct Answer: 4 (readystate complete)

Note: This Question is unanswered, help us to find answer for this one

Sending asynchronous requests is a huge improvement for web developers. Many of the tasks performed on the server are very time consuming. Before AJAX, this operation could cause the application to hang or stop. so, what is the best way to be done by web developers when sending asynchronous requests?

deal with the response when the response ready

execute other scripts while waiting for server response

try again sending asynchronous requests

Answer & Explanation

Correct Answer: execute other scripts while waiting for server response

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AJAX applications are browser- and platform-dependent!

False

True

Answer & Explanation

Correct Answer: False

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What happens if an Ajax call completes (and calls its callback function) when other JavaScript is currently running?

The Ajax callback function will run immediately in another thread, allowing the currently-running code to complete as normal

The currently-running code will terminate, and the Ajax callback function will be called immediately

The Ajax callback function will be queued until the currently-running code completes

Answer & Explanation

Correct Answer: The Ajax callback function will be queued until the currently-running code completes

Note: This Question is unanswered, help us to find answer for this one

What is the value of the "status" attribute of the completed XMLHttpRequest object if the Ajax request has pulled the response data from the browser cache? Consider only non-IE browsers.

301

304

200

"cached"

Answer & Explanation

Correct Answer: 200

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What HTTP response header is expected in reply to a CORS request?

Cross-Origin-Permissions

Access-Control-Allow-Origin

Allow-Cross-Origin-Access

Allow-CORS

Answer & Explanation

Correct Answer: Access-Control-Allow-Origin

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In non-IE browsers, what attribute should you check your XMLHttpRequest object for in order to see if it supports CORS?

crossDomain

xDomain

hasCors

withCredentials

Answer & Explanation

Correct Answer: withCredentials

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What is the value of the .status attribute of the completed XMLHttpRequest object if the Ajax request needed to follow a server-side redirect before successfully finding the intended resource?

301

304

200

"redirected"

Answer & Explanation

Correct Answer: 200

Note: This Question is unanswered, help us to find answer for this one

What is the difference between the XMLHttpRequest object's .status and .statusText attributes?

.statusText is the more widely supported of the two across browsers

.status returns a numeric-only code instead of the full HTTP response, which can be found in .statusText

.statusText is not a valid attribute of the XMLHttpRequest object

.status is read-only, while .statusText can be modified

Answer & Explanation

Correct Answer: .status returns a numeric-only code instead of the full HTTP response, which can be found in .statusText

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Which property of the popstate event contains a copy of the history entry's state object?

currentState

copyState

none of the above

state

historyState

Answer & Explanation

Correct Answer: state

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Ajax Quick Quiz

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You need a lot of improvement.

Just don't give up!

Correct Answers: 0/10

Start Practicing with our MCQs given below.