AJAX

Question 1

What is the purpose of ajax

Answer 1

technique that enables a page to request/submit data without reloading a page or postback

Question 2

what is postback

Answer 2

when data is sent from browser to page (and typically new page is needed)

Question 3

instantiate an XhtmlHttpRequest object

Answer 3

var xhr = new XhtmlHttpRequest();

Question 4

using XHR, open a GET request to fetch google.com’s home page

Answer 4

xhr.open(“GET”, “http://www.google.com/”, false);

Question 5

send an xhr request with null data

Answer 5

xhr.send(null);

Question 6

Check if an xhr request returns a succesfull request

Answer 6

if (xhr.status == 200)

Question 7

how can you find an xhr response’s plain text

Answer 7

xhr.responseText

Question 8

how can you find an xhr status

Answer 8

xhr.statusText