2. The original Web
• Basic Web model is very simple
Client Server
URL HTML Page
Allows the user to select different pages
But doesn’t allow for much interaction
3. The interactive Web
• Adds two important elements
Client Server C Extension
G
Form Variables I
URL Program
HTML Page
4. Client Side
• <form> tag allows user input through a
variety of controls
• User input is sent in a response string
as a set of item/value pairs
• There are two methods
– GET
– POST
5. Server side
• Server extensions run programs
– The CGI specifies Server C Extension
G
the interface to the I
Program
Server HTML Page
– The HTML is
generated dynamically
• ASP, PHP, .NET, PERL, Python etc
6. Example using GET
<html>
<head>
</head>
<body>
<h4>Bradfield Arts<h4>
<h5>Using GET</h5>
<form action="processg.php" method="get">
<select name="item">
<option>Paint</option>
<option>Brushes</option>
<option>Erasers</option>
</select>
Quantity:<input name="quantity" type= "text" />
<input type ="submit" />
</form>
</body>
</html>
7. Example using GET
<html>
<head>
</head>
<body>
<br>
<?php $quantity = $_GET['quantity'];
$item = $_GET['item'];
echo "You used GET to order ".$quantity." ".$item."<br/>";
echo "Look at the URL!";
echo "Thank you";
?>
</body>
</html>
