Asynchronous JavaScript And XML
AJAX is a browser technology that is used to more interactive and
fast web applications using XML, CSS , JavaScript and HTML.
AJAX uses XHTML to content, CSS for decorate the
presentation layer, DOM (Document Object Model ) and JavaScript for dynamic
content display and functionality. XML is used as the format for
receiving server data. XMLHTTPRequest is a JavaScript object that
performs the asynchronous interaction with the server.
Normal web applications transmit data to the server and get data
from the data from the server using synchronous requests. But when we use
AJAX, JavaScript will make a request to the server, interpret the result
and update the current interface. Then the user will never notice anything was
transmitted to the server. AJAX is totally independence from the web
server software.
Steps of AJAX operations
·
Client
event occurs
·
XMLHTTPRequest
is configured.
·
XMLHTTPRequest
object makes an asynchronous request to the web server.
·
Web
server returns the result containing XML document.
·
XMLHTTPRequest
object calls the callback function and process the result.
·
HTML
DOM is updated.
