|
|
| AJAX: Redefining Web Applications |
|
|
Let’s construct and parse the response data:
I. Constructing and parsing response data using XML:
• There is XML parser is built into most browsers; we just have to leverage the built-in parser.
• On the Servlet side, we can construct XML using the following ways:
• StringBuffer [common approach]
• JDOM
• DOM4J
• SAX [Simple API for XML]
• Faster than JDOM & DOM4J
• On the Client side, we’ve to parse the response XML string using the browser inbuilt parser.
• Firefox, Mozilla, Opera, and Safari all use new DOMParser() to get a built-in parser that can parse XML
• Internet Explorer, on the other hand, uses new ActiveXObject(“Microsoft.XMLDOM”) to get the Microsoft XML parser.
• Example XML response string:
<converted-values>
<decimal>97</decimal>
<hexadecimal>0x61</hexadecimal>
<octal>0141</octal>
<binary>1100001B</binary>
</converted-values>
Code illustrations for Constructing and parsing response data using XML:
AJAXCharacterDecoderUsingXML.html
<!DOCTYPE HTML PUBLIC “-//W3C//DTD
HTML 4.01 Transitional//EN”>
<html>
<head>
<title>AJAXCharacterDecoder.html</title>
|
|
<meta http-equiv=”keywords”
content=”keyword1,keyword2,keyword3">
<meta http-equiv=”description” content=”this
is my page”>
<meta http-equiv=”content-type”
content=”text/html; charset=UTF-8">
<!—<link rel=”stylesheet” type=”text/css”
href=”./styles.css”>—>
<script language=”javascript”>
var request;
function convertToXML( ){
var key = document.getElementById(“key”);
var keypressed =
document.getElementById(“keypressed”);
keypressed.value = key.value;
var url = “/ajaxapp/
CharacterDecoderUsingXML?key=” +
escape(key.value);
if(window.XMLHttpRequest){
request = new XMLHttpRequest();
} else{
request = new
ActiveXObject(“Microsoft.XMLHTTP”);
}
request.open(“Get”,url,true);
request.onreadystatechange = callback;
request.send(null);
}
function callback( ){
if(request.readyState == 4){
if(request.status == 200){
if(window.XMLHttpRequest){
nonMSPopulate();
} else{
msPopulate();
}}}}
function nonMSPopulate( ){
var response = request.responseText;
var xmlDoc =
document.implementation.createDocument(“”,””,null);
var parser = new DOMParser();
var dom = |
|
Nov 2007 | Java Jazz Up | 50 |
| |
|
| |
| View All Topics |
| All Pages of this Issue |
Pages:
1,
2,
3,
4,
5,
6,
7,
8,
9,
10,
11,
12,
13,
14,
15,
16,
17,
18,
19,
20,
21,
22,
23,
24,
25,
26,
27,
28,
29,
30,
31,
32,
33,
34,
35,
36,
37,
38,
39,
40,
41,
42,
43,
44,
45,
46,
47,
48,
49,
50,
51,
52,
53 ,
54,
55,
56,
57,
58,
59,
60,
61,
62,
63 ,
64,
65 ,
66 ,
67 ,
68 ,
69 Download PDF |
|
|
|
|
|
|
| |
| |
|
