·
AJAX stands for Asynchronous JavaScript and XML. AJAX is a new technique for
creating better, faster, and more interactive web applications with the help of
XML, HTML, CSS, and Java Script.
·
Ajax uses XHTML for content, CSS for presentation, along with Document
Object Model and JavaScript for dynamic content display.
·
Conventional web applications transmit information to and from the
sever using synchronous requests. It means you fill out a form, hit submit, and
get directed to a new page with new information from the server.
·
With AJAX, when you hit submit, JavaScript will make a request to
the server, interpret the results, and update the current screen. In the purest
sense, the user would never know that anything was even transmitted to the
server.
·
XML is commonly used as the format for receiving server data,
although any format, including plain text, can be used.
·
AJAX is a web browser technology independent of web server
software.
·
A user can continue to use the application while the client
program requests information from the server in the background.
·
Intuitive and natural user interaction. Clicking is not required,
mouse movement is a sufficient event trigger.
·
Data-driven as opposed to page-driven.
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Rich Internet
Application Technology
AJAX is the most viable Rich
Internet Application (RIA) technology so far. It is getting tremendous industry
momentum and several tool kit and frameworks are emerging. But at the same
time, AJAX has browser incompatibility and it is supported by JavaScript, which
is hard to maintain and debug.
AJAX is Based on Open
Standards
AJAX is based on the following
open standards:
- Browser-based
presentation using HTML and Cascading Style Sheets (CSS).
- Data is stored
in XML format and fetched from the server.
- Behind-the-scenes
data fetches using XMLHttpRequest objects in the browser.
- JavaScript to
make everything happen.
AJAX - Database Operations
To clearly illustrate how easy it
is to access information from a database using AJAX, we are going to build
MySQL queries on the fly and display the results on "ajax.html". But
before we proceed, let us do the ground work. Create a table using the
following command.
NOTE: We are
assuming you have sufficient privilege to perform the following MySQL
operations
CREATE TABLE 'ajax_example' (
'name' varchar(50) NOT NULL,
'age' int(11) NOT NULL,
'sex' varchar(1) NOT NULL,
'wpm' int(11) NOT NULL,
PRIMARY KEY ('name')
)
Now dump the following data into
this table using the following SQL statements:
INSERT INTO 'ajax_example' VALUES ('Jerry', 120, 'm', 20);
INSERT INTO 'ajax_example' VALUES ('Regis', 75, 'm', 44);
INSERT INTO 'ajax_example' VALUES ('Frank', 45, 'm', 87);
INSERT INTO 'ajax_example' VALUES ('Jill', 22, 'f', 72);
INSERT INTO 'ajax_example' VALUES ('Tracy', 27, 'f', 0);
INSERT INTO 'ajax_example' VALUES ('Julie', 35, 'f', 90);
Client Side HTML File
Now let us have our client side
HTML file, which is ajax.html, and it will have the following code:
<html>
<body>
<script language="javascript" type="text/javascript">
<!--
//Browser Support Code
function ajaxFunction(){
var ajaxRequest; // The variable that makes Ajax possible!
try{
// Opera 8.0+, Firefox, Safari
ajaxRequest = new XMLHttpRequest();
}catch (e){
// Internet Explorer Browsers
try{
ajaxRequest = new ActiveXObject("Msxml2.XMLHTTP");
}catch (e) {
try{
ajaxRequest = new ActiveXObject("Microsoft.XMLHTTP");
}catch (e){
// Something went wrong
alert("Your browser broke!");
return false;
}
}
}
// Create a function that will receive data
// sent from the server and will update
// div section in the same page.
ajaxRequest.onreadystatechange = function(){
if(ajaxRequest.readyState == 4){
var ajaxDisplay = document.getElementById('ajaxDiv');
ajaxDisplay.innerHTML = ajaxRequest.responseText;
}
}
// Now get the value from user and pass it to
// server script.
var age = document.getElementById('age').value;
var wpm = document.getElementById('wpm').value;
var sex = document.getElementById('sex').value;
var queryString = "?age=" + age ;
queryString += "&wpm=" + wpm + "&sex=" + sex;
ajaxRequest.open("GET", "ajax-example.php" + queryString, true);
ajaxRequest.send(null);
}
//-->
</script>
<form name='myForm'>
Max Age: <input type='text' id='age' /> <br />
Max WPM: <input type='text' id='wpm' /> <br />
Sex:
<select id='sex'>
<option value="m">m</option>
<option value="f">f</option>
</select>
<input type='button' onclick='ajaxFunction()' value='Query MySQL'/>
</form>
<div id='ajaxDiv'>Your result will display here</div>
</body>
</html>
NOTE: The way
of passing variables in the Query is according to HTTP standard and have formA.
URL?variable1=value1;&variable2=value2;
The above code will give you a
screen as given below:
NOTE: This is
dummy screen and would not work
Your result will display here in
this section after you have made your entry.
NOTE: This is
a dummy screen.
Server Side PHP File
Your client-side script is ready.
Now, we have to write our server-side script, which will fetch age, wpm, and
sex from the database and will send it back to the client. Put the following
code into the file "ajax-example.php".
<?php
$dbhost = "localhost";
$dbuser = "dbusername";
$dbpass = "dbpassword";
$dbname = "dbname";
//Connect to MySQL Server
mysql_connect($dbhost, $dbuser, $dbpass);
//Select Database
mysql_select_db($dbname) or die(mysql_error());
// Retrieve data from Query String
$age = $_GET['age'];
$sex = $_GET['sex'];
$wpm = $_GET['wpm'];
// Escape User Input to help prevent SQL Injection
$age = mysql_real_escape_string($age);
$sex = mysql_real_escape_string($sex);
$wpm = mysql_real_escape_string($wpm);
//build query
$query = "SELECT * FROM ajax_example WHERE sex = '$sex'";
if(is_numeric($age))
$query .= " AND age <= $age";
if(is_numeric($wpm))
$query .= " AND wpm <= $wpm";
//Execute query
$qry_result = mysql_query($query) or die(mysql_error());
//Build Result String
$display_string = "<table>";
$display_string .= "<tr>";
$display_string .= "<th>Name</th>";
$display_string .= "<th>Age</th>";
$display_string .= "<th>Sex</th>";
$display_string .= "<th>WPM</th>";
$display_string .= "</tr>";
// Insert a new row in the table for each person returned
while($row = mysql_fetch_array($qry_result)){
$display_string .= "<tr>";
$display_string .= "<td>$row[name]</td>";
$display_string .= "<td>$row[age]</td>";
$display_string .= "<td>$row[sex]</td>";
$display_string .= "<td>$row[wpm]</td>";
$display_string .= "</tr>";
}
echo "Query: " . $query . "<br />";
$display_string .= "</table>";
echo $display_string;
?>
Now try by entering a valid value
(e.g., 120) in Max Age or any
other box and then click Query MySQL button.
Your result will display here in
this section after you have made your entry.
If you
have successfully completed this lesson, then you know how to use MySQL, PHP,
HTML, and Javascript in tandem to write AJAX applications.
AJAX can be used for interactive communication with a database.
AJAX
Database Example
The following example will
demonstrate how a web page can fetch information from a database with AJAX:
Example
Person
info will be listed here...
Example
Explained - The MySQL Database
The database table we use in
the example above looks like this:
id
|
FirstName
|
LastName
|
Age
|
Hometown
|
Job
|
1
|
Peter
|
Griffin
|
41
|
Quahog
|
Brewery
|
2
|
Lois
|
Griffin
|
40
|
Newport
|
Piano Teacher
|
3
|
Joseph
|
Swanson
|
39
|
Quahog
|
Police Officer
|
4
|
Glenn
|
Quagmire
|
41
|
Quahog
|
Pilot
|
Example
Explained
In the example above, when a user
selects a person in the dropdown list above, a function called
"showUser()" is executed.
The function is triggered by
the onchange event.
Here is the HTML code:
Example
<html>
<head>
<script>
function showUser(str) {
if (str == "") {
document.getElementById("txtHint").innerHTML = "";
return;
} else {
if (window.XMLHttpRequest) {
// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp = new XMLHttpRequest();
} else {
// code for IE6, IE5
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange = function() {
if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
document.getElementById("txtHint").innerHTML = xmlhttp.responseText;
}
}
xmlhttp.open("GET","getuser.php?q="+str,true);
xmlhttp.send();
}
}
</script>
</head>
<body>
<form>
<select name="users" onchange="showUser(this.value)">
<option value="">Select a person:</option>
<option value="1">Peter Griffin</option>
<option value="2">Lois Griffin</option>
<option value="3">Joseph Swanson</option>
<option value="4">Glenn Quagmire</option>
</select>
</form>
<br>
<div id="txtHint"><b>Person info will be listed here...</b></div>
</body>
</html>
<head>
<script>
function showUser(str) {
if (str == "") {
document.getElementById("txtHint").innerHTML = "";
return;
} else {
if (window.XMLHttpRequest) {
// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp = new XMLHttpRequest();
} else {
// code for IE6, IE5
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange = function() {
if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
document.getElementById("txtHint").innerHTML = xmlhttp.responseText;
}
}
xmlhttp.open("GET","getuser.php?q="+str,true);
xmlhttp.send();
}
}
</script>
</head>
<body>
<form>
<select name="users" onchange="showUser(this.value)">
<option value="">Select a person:</option>
<option value="1">Peter Griffin</option>
<option value="2">Lois Griffin</option>
<option value="3">Joseph Swanson</option>
<option value="4">Glenn Quagmire</option>
</select>
</form>
<br>
<div id="txtHint"><b>Person info will be listed here...</b></div>
</body>
</html>
Code explanation:
First, check if no person is
selected (str == ""). If no person is selected, clear the content of
the txtHint placeholder and exit the function.
If a person is selected, do the
following:
- Create
an XMLHttpRequest object
- Create
the function to be executed when the server response is ready
- Send
the request off to a file on the server
- Notice
that a parameter (q) is added to the URL (with the content of the dropdown
list)
The PHP
File
The page on the server called
by the JavaScript above is a PHP file called "getuser.php".
The source code in
"getuser.php" runs a query against a MySQL database, and returns the
result in an HTML table:
<!DOCTYPE html>
<html>
<head>
<style>
table {
width: 100%;
border-collapse: collapse;
}
table, td, th {
border: 1px solid black;
padding: 5px;
}
th {text-align: left;}
</style>
</head>
<body>
<?php
$q = intval($_GET['q']);
$con = mysqli_connect('localhost','peter','abc123','my_db');
if (!$con) {
die('Could not connect: ' . mysqli_error($con));
}
mysqli_select_db($con,"ajax_demo");
$sql="SELECT * FROM user WHERE id = '".$q."'";
$result = mysqli_query($con,$sql);
echo "<table>
<tr>
<th>Firstname</th>
<th>Lastname</th>
<th>Age</th>
<th>Hometown</th>
<th>Job</th>
</tr>";
while($row = mysqli_fetch_array($result)) {
echo "<tr>";
echo "<td>" . $row['FirstName'] . "</td>";
echo "<td>" . $row['LastName'] . "</td>";
echo "<td>" . $row['Age'] . "</td>";
echo "<td>" . $row['Hometown'] . "</td>";
echo "<td>" . $row['Job'] . "</td>";
echo "</tr>";
}
echo "</table>";
mysqli_close($con);
?>
</body>
</html>
<html>
<head>
<style>
table {
width: 100%;
border-collapse: collapse;
}
table, td, th {
border: 1px solid black;
padding: 5px;
}
th {text-align: left;}
</style>
</head>
<body>
<?php
$q = intval($_GET['q']);
$con = mysqli_connect('localhost','peter','abc123','my_db');
if (!$con) {
die('Could not connect: ' . mysqli_error($con));
}
mysqli_select_db($con,"ajax_demo");
$sql="SELECT * FROM user WHERE id = '".$q."'";
$result = mysqli_query($con,$sql);
echo "<table>
<tr>
<th>Firstname</th>
<th>Lastname</th>
<th>Age</th>
<th>Hometown</th>
<th>Job</th>
</tr>";
while($row = mysqli_fetch_array($result)) {
echo "<tr>";
echo "<td>" . $row['FirstName'] . "</td>";
echo "<td>" . $row['LastName'] . "</td>";
echo "<td>" . $row['Age'] . "</td>";
echo "<td>" . $row['Hometown'] . "</td>";
echo "<td>" . $row['Job'] . "</td>";
echo "</tr>";
}
echo "</table>";
mysqli_close($con);
?>
</body>
</html>
Explanation: When the query is
sent from the JavaScript to the PHP file, the following happens:
- PHP
opens a connection to a MySQL server
- The
correct person is found
- An
HTML table is created, filled with data, and sent back to the
"txtHint" placeholder
The XMLHttpRequest object is the
key to AJAX. It has been available ever since Internet Explorer 5.5 was
released in July 2000, but was not fully discovered until AJAX and Web 2.0 in
2005 became popular.
XMLHttpRequest (XHR) is an API
that can be used by JavaScript, JScript, VBScript, and other web browser
scripting languages to transfer and manipulate XML data to and from a webserver
using HTTP, establishing an independent connection channel between a webpage's
Client-Side and Server-Side.
The data returned from
XMLHttpRequest calls will often be provided by back-end databases. Besides XML,
XMLHttpRequest can be used to fetch data in other formats, e.g. JSON or even
plain text.
You already have seen a couple of
examples on how to create an XMLHttpRequest object.
Listed below is listed are some
of the methods and properties that you have to get familiar with.
XMLHttpRequest Methods
- abort()
Cancels the current request.
- getAllResponseHeaders()
Returns the complete set of HTTP
headers as a string.
- getResponseHeader(
headerName )
Returns the value of the
specified HTTP header.
- open( method,
URL )
open( method, URL, async )
open( method, URL, async,
userName )
open( method, URL, async,
userName, password )
Specifies the method, URL, and
other optional attributes of a request.
The method parameter can have a
value of "GET", "POST", or "HEAD". Other HTTP
methods, such as "PUT" and "DELETE" (primarily used in REST
applications) may be possible.
The "async" parameter
specifies whether the request should be handled asynchronously or not.
"true" means that the script processing carries on after the send()
method without waiting for a response, and "false" means that the
script waits for a response before continuing script processing.
- send( content )
Sends the request.
·
setRequestHeader( label, value )
Adds a label/value pair to the
HTTP header to be sent.
XMLHttpRequest
Properties
- onreadystatechange
An event handler for an event
that fires at every state change.
- readyState
The readyState property defines
the current state of the XMLHttpRequest object.
The following table provides a
list of the possible values for the readyState property:
State
|
Description
|
0
|
The request is not
initialized.
|
1
|
The request has been set up.
|
2
|
The request has been sent.
|
3
|
The request is in process.
|
4
|
The request is completed.
|
readyState = 0 After you have created the XMLHttpRequest
object, but before you have called the open() method.
readyState = 1 After you have called the open() method, but
before you have called send().
readyState = 2 After you have called send().
readyState = 3 After the browser has established a
communication with the server, but before the server has completed the
response.
readyState = 4 After the request has been completed, and the
response data has been completely received from the server.
- responseText
Returns the response as a string.
- responseXML
Returns the response as XML. This
property returns an XML document object, which can be examined and parsed using
the W3C DOM node tree methods and properties.
- status
Returns the status as a number
(e.g., 404 for "Not Found" and 200 for "OK").
- statusText
Returns the status as a string
(e.g., "Not Found" or "OK").
AJAX Security: Server
Side
·
AJAX-based Web applications use the same server-side security
schemes of regular Web applications.
·
You specify authentication, authorization, and data protection
requirements in your web.xml file (declarative) or in your program
(programmatic).
·
AJAX-based Web applications are subject to the same security
threats as regular Web applications.
AJAX Security: Client
Side
·
JavaScript code is visible to a user/hacker. Hacker can use
JavaScript code for inferring server-side weaknesses.
·
JavaScript code is downloaded from the server and executed
("eval") at the client and can compromise the client by mal-intended
code.
·
Downloaded JavaScript code is constrained by the sand-box security
model and can be relaxed for signed JavaScript.
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