Introduction to AJAX: What is AJAX and How it Works

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Questions and Answers

What is the primary function of the XMLHttpRequest object in AJAX?

  • To display data on a web page
  • To exchange data with a server behind the scenes (correct)
  • To update the HTML DOM
  • To create a server-side script

What does AJAX stand for?

  • Advanced JavaScript and XML
  • Adaptive JavaScript and XML
  • Asynchronous JavaScript and XML (correct)
  • Alternative JavaScript and XML

What is the main benefit of using AJAX in web applications?

  • To allow web pages to be updated asynchronously (correct)
  • To provide a more secure way of data exchange
  • To reduce the amount of data sent over the network
  • To increase the speed of web page loading

Who introduced AJAX to the world through an article in 2005?

<p>Jesse James Garrett (A)</p>
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What is the name of the organization that released the first draft of the XMLHttpRequest object specification in 2006?

<p>W3C (B)</p>
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What is a common misconception about the name AJAX?

<p>It's only used for XML data exchange (B)</p>
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What is the purpose of the onreadystatechange property?

<p>To define a function to be executed when the readyState changes (D)</p>
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What is the value of the readyState property when the request is received?

<p>2 (C)</p>
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What is the status code for 'Forbidden'?

<p>403 (D)</p>
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What is the purpose of the xhttp.send() method?

<p>To send the request to the server (D)</p>
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What is the property that returns the status-text (e.g. 'OK' or 'Not Found')?

<p>statusText (B)</p>
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What is the purpose of the abort() method in an XMLHttpRequest object?

<p>To cancel the current request (A)</p>
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Which property of the XMLHttpRequest object holds the status of the request?

<p>readyState (D)</p>
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What is the purpose of the getResponseHeader() method?

<p>To return a specific response header (A)</p>
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What is the difference between the send() and send(string) methods?

<p>send() is used for GET requests, while send(string) is used for POST requests (C)</p>
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What is the purpose of the onreadystatechange property?

<p>To define a function to be called when the readyState property changes (B)</p>
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What is the meaning of the status code 404?

<p>Not Found (C)</p>
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