HowTo Ajax Aug2011
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Transcript of HowTo Ajax Aug2011
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Ajax How To
Preface
The purpose of this document is to assist in integrating AJAX functionality into an application.
Introduction
AJAX is an acronym for - Asynchronous JavaScript and XML.
It is used for exchanging data asynchronously between browser and server to avoid full page
reloads (behind the scenes and in parallel).
Technical details
AJAX request-response cycle consists of the following phases called readyState!s". They are -
o # $ %&S'&T $ The o()ect has (een constructed
o * $ +,'&' $ Server connection esta(lished
o $ /'A'0S10'2'34' $5inal request headers received 6including redirects7
o 8 $ L+A3&9 $ The response entity (ody is (eing received.
o : $+&' $ The data transfer has (een completed or something went wrong during the
transfer
The possi(le /TT, request status codes are $
o *;; - 3nformational
o ;; - Successful
o 8;; - 0edirection
o :;; - 2lient 'rror
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ajax-request.html
BE+2TF,'html,%GL32H-I82T /TML :.#* Transitional'&[email protected]:loose.dtdHC
BhtmlC
BheadC
Bmetahttp-equiv"Content-Type"content"text/html; charset=ISO-885-!"C
BtitleCA)a; - /owTo - 0equestBtitleC
Bscripttype"text/a#ascr$pt"src"aax-scr$pt%s"CBscriptC
Bscripttype"text/a#ascr$pt"C
functionsend0equest67 K
%0Ls that (egin with http 6protocol7 are a(solute %0Ls
and need to (e specified in full.
5or e;ample @ http@localhost@D#D#a)a;a)a;-response.t;t
%0Ls that (egin with are relative to the
server-root-address and are appended to it.
5or e;ample @ http@localhost@D#D# is prefi;ed to a)a;a)a;-response.t;t
+ther %0Ls are )ust appended to the last with respect to the %0L of page
5or e;ample @ http@localhost@D#D#a)a; is prefi;ed to a)a;-response.t;t
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ajax-request.html Continued
This function will (e passed as the call(ac= function.
3n this case? the call(ac= is invo=ed each time the ready state changes.
functiona)a;2allGac=/andler6;ml/ttp0eq+()7 K
document.get'lementGy3d6Ha)a;0esponse2ontainerH7.inner/TML ;ml/ttp0eq+().readyStateN
'ven though this function is called on each and every change to the
ready state? this function only handles the com(ination of the following -
request sent and response received 6readyState-:7 and the result of the request
(eing successful 6Status-##7
Gesides the H##-+PH status? the other common http-request states include
H:#:-&ot foundH and H
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ajax-response.txt
ajax-script.js
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