1. Welcome to WEB 2.0 An Open Laszlo presentation Part 2 Carlos Fernando Scheidecker Antunes antunes@cs.utah.edu http://www.cs.utah.edu/~antunes/AJAX antunes@cs.utah.edu Feb 15 2006

2. What is WEB 2.0? Web 2.0 is a term often applied to a perceived ongoing transition of the World Wide Web from a collection of websites to a full-fledged computing platform serving web applications to end users. Ultimately Web 2.0 services are expected to replace desktop computing applications for many purposes.

3. What is Laszlo ?

4. Laszlo is a rich client platform for web application. Without realizing, it was the first AJAX application I ever written back in 2004 It uses Flash, Java, XML and a Servlet engine to provide a rich client desktop like experience for the user. It is the future of web and client server applications

5. Laszlo’s Components Compiler Takes the XML text file (.lzx) and produces the executable in Flash. CGI Use a Servlet, PHP, ASP.net to optionally provide http based SOAP and XML-RPC web services.

6. Laszlo’s Components Run time Framework Set of Servlets that provide user interface components, data binding, timer, Asynchronous network services

7. Laszlo Overview

8. Coding with Laszlo It is important to understand that Laszlo provides the user side. You can embed JavaScript within your Laszlo XML source code to program the client side. Laszlo is the View share of the MVC pattern. The business side resides on the CGI applications that provide data for the Desktop much like an AJAX pattern.

9. Example of Laszlo code This is a simple valid LZX source file. Note the XML format: <dataset name="dset" autorequest="true" type="http" src="getemployees.jsp"/>

10. Development cycle Develop a Laszlo application requires the following steps: 1 - Define the data sources writing the appropriate CGI programs. These programs will work like a dynamic web application with the difference that data not content is provided and the format is XML

11. Development cycle Develop a Laszlo application requires the following steps: 2 – Write the Laszlo source code and compile it through the Laszlo compiler which is a Servlet living inside a container like Tomcat

12. Development cycle Develop a Laszlo application requires the following steps: 3 – Test your application 4 – Deploy the application

13. What’s the catch? Laszlo is a great platform but it requires: 1 – Patience, it takes a while to compile the lzx. 2 – It is hard to code, you need to write a few applications to get proficiency with the platform. Learning curve. 3 – Understand AJAX and GUI application development. 4 – For large deployments clustering load balancing is a must.

14. Questions Have any questions, concerns or fears? This is the time.

15. Thank you! Please remember: I will keep the material, examples and source code on the following address: http://www.cs.utah.edu/~antunes/AJAX/ antunes@cs.utah.edu