The Java Boutique: Articles : Open Source Shopping Cart

javaboutique

Articles | Tutorials | Reviews | Tools | by Category | by Date | by Name | Submit | Source | Forums |

javaboutique

DevX Updates - Sign Up Here

Partners & Affiliates

JavaBoutique : Articles : Open Source Shopping Cart:

Contents

Persistence: Method 1

Persistence: Method 2

Illustration: Example 1: Applets

Illustration: Example 2: Active X

Illustration: Example 3: Pseudo-Constructor

Extended Examples

Shopping Cart and Database

Multiple Merchants

Addendum: Mac Version and Back End Progress

Open Source Shopping Cart Code

The following two lines of code are inserted into any HTML page that wishes to offer items for sale; I usually place them right after the <BODY> tag:

As mentioned earlier, one must add a CODEBASE=../, or some equivalent, to the <APPLET> tag when the HTML file is in a directory other than the one that contains the applet. A look at the source code posted elsewhere will give examples.

	<APPLET code=app.class height=1
		id=app name=app width=1 archive="app.zip"></APPLET>
	<SCRIPT LANGUAGE=javascript>function buy(a,b,
		c,d){document.app.prod(a,b,c,d)}</SCRIPT>

These lines load an applet called app.class. The code for "app" is as follows:

import java.applet.*;
public class app extends Applet
{
	public void start()
	{
		ShopPanel.initValues(this);
	}
	public void prod(String iD, String it, String pr, String sh)
	{
		ShopPanel.prod(iD,it,pr,sh);
	}
}

Let me make some comments for Open Source developers. First, the applet is the segment that is being reloaded, and it is short. This makes page to page transfer essentially instantaneous.

Second, HTML memory depends upon the applet being restarted, not reloaded. This appears to happen invariably, with an applet this size, in all current browsers. However, as features are added to the applet, one can begin to trigger a reload rather than a restart, particularly in HTML pages that are very complex. Pseudo-constructors continue to do their job; the result is a frame which persists, and whose purchases can still be finalized, but which is no longer accessible by any HTML page. It has become "detached." Further purchases bring up a second frame, which also persists. All further purchases are now added to the second frame. In order to keep size down, and to ensure restarting rather than reloading, Open Source programmers will probably find, as I have, that it is best to make changes in classes other than "app."

Third, notice that we call start() in the applet, and not init(). This is because init() is called the first time that an applet is loaded, whereas start() is called every time that a page transfer is made. Our goal is to update the rest of the code with the current address of the restarted applet every time the applet is reloaded. By passing on the value of "this", we can then use commands like "this.showDocument()." This continual updating can only be done by calling start().

Applet Index
(sorted alphabetically)
A B C D E F G H I J K
L M N O P Q R S T U
V W X Y Z #s

The Java Source
(applets w/source code)
A B C D E F G H I J K
L M N O P Q R S T U
V W X Y Z

How to Add Java Applets to Your Site

New on the Java Boutique:

New Review:

Time Management Made Easy with the Quartz Enterprise Job Scheduler
Why not just use the Java timer API? This open source scheduling API boasts simplicity, ease-of-integration, a well-rounded feature set, and it's free!

New Applet:

Reverse Complement
Reverse Complement is a simple applet that converts DNA or RNA sequences into three useful formats.

Elsewhere on internet.com:

WebDeveloper Java
Lots of Java information on webdeveloper.com

WDVL Java
Thorough Java resource at the Web Developer's Virtual Library.

ScriptSearch Java
Hundreds of free Java code files to download.

jGuru: Your View of the Java Universe
Customizable portal with online training, FAQs, regular news updates, and tutorials.

Avaya Developer Showcase

PHP for Windows Showcase
XML error: undefined entity at line 34

	Receive Articles via our XML/RSS feed
	Receive Articles via our XML/RSS feed

JavaBytes
Internet Cyclone
This powerful, easy-to-use, internet optimizer is for Windows 95, 98, ME, NT, 2000 and XP. It's designed to automatically optimize your Windows settings, boosting your Internet connection up to 200%.

IBM Brings Developers Into the Cloud
Apache at 10: You Can't Buy Us
Microsoft's CodePlex Foundation Moving Forward
Apple Claims 100,000 Apps, Google Analyzes Them
Nokia Latest to Play Opera Mobile 10 Browser
PayPal Opens Up Payment Platform to Devs
Ubuntu Linux 9.10 'Karmic Koala' Starts Its Climb
IBM Links Rational Developer Tools, Tivoli Apps
Libraries Give Vista Apps a Windows 7 Look
Ubuntu: The 'Default Alternative' to Windows?

Delivering Web-based Embedded Fonts in CSS 3
Adobe Helps PHP Developers Create Rich Internet Applications
Java Developers Finding a Home at Adobe Flex
Virtualization Delivers a Dynamic Infrastructure
Consuming XML Web Services in iPhone Applications
Build a More Agile Business with IBM
POJO-Based Solutions for LDAP Access: One Good, One Better
IBM Offers Enhanced Measurement and Management for Energy Usage
IBM Helps Transformation to an Information-Based Enterprise
Top Five Touch UI-Related Design Guidelines

Advertising Info | Member Services | Contact Us | Help | Feedback | Site Map | Network Map | About

WebMediaBrands Corporate Info

Legal Notices, Licensing, Reprints, Permissions, Privacy Policy.
Advertise | Newsletters | Shopping | E-mail Offers | Freelance Jobs

Whitepapers and eBooks

Adobe Article: Adobe Helps PHP Developers Create Rich Internet Applications
Adobe Article: Java Developers Finding a Home at Adobe Flex
IBM Articles: A Smarter Business Needs Smarter Technology
Intel Xeon Processor Increases Server Efficiency and Capabilities
Intel Tech Brief: Automated Energy Efficiency for the Intelligent Enterprise
Oracle Whitepaper: Using Oracle In-Memory Database Cache to Accelerate the Oracle Database
Oracle Whitepapers - Innovation for IT Leaders
Avaya Article: Communication-Enabled Mashups--Empowering Both Business Owners and IT

Internet.com eBook: IT Manager's Guide to Social Networking
Internet.com eBook: Get Ready for Windows 7
Microsoft Article: Expression Web 3--New Features for PHP Developers
Whitepapers: Manage Your Business Infrastracture with IBM
Whitepaper: Maximize Your Storage Investment with HP
Internet.com eBook: Becoming a Better Project Manager
Microsoft Article: Stress Free and Efficient Designer/Developer Collaboration
MORE WHITEPAPERS, EBOOKS, AND ARTICLES

Webcasts

Webcast: Connecting PHP to Microsoft Technologies
Video: Microsoft Partner Program Benefits
Video: Windows Azure Debugging Tips
SAP BusinessObjects Webcast: Unlock the Power of Reporting with Crystal Reports

IBM Webcast: Speed Business Innovation with Reduced Cost and Risk
Video: Deploy Applications on Windows Azure
MORE WEBCASTS, PODCASTS, AND VIDEOS

Downloads and eKits

Downloads & Free Trials: Microsoft's New Efficiency Resource Center
Get the Windows 7 SDK
Free Trial: Red Gate SQL Backup Pro 6

Iron Speed Designer Application Generator
MORE DOWNLOADS, EKITS, AND FREE TRIALS

Tutorials and Demos

Virtual Lab: Migrating PHP Applications
Enabling Web Slices and Accelerators with a PHP Site
Internet.com Hot List: Get the Inside Scoop on the Hottest IT and Developer Products

All About Botnets
MORE TUTORIALS, DEMOS AND STEP-BY-STEP GUIDES