VFP & Ajax
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This document provides an overview of AJAX (Asynchronous JavaScript and XML) and how it can be used with Visual FoxPro. It defines AJAX as a development technique that allows web applications to provide a desktop-like user experience. The document outlines the core AJAX technologies including HTML, CSS, DOM, XML, XMLHTTP, and JavaScript. It then discusses how these pieces can be combined and integrated with server-side technologies like Visual FoxPro to enable asynchronous communication and updating of web pages. Examples are provided around retrieving data and updating pages using AJAX calls from VFP. Resources for further learning about AJAX and related frameworks are also included.
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VFP & Ajax
- 1. VFP & AJAX Mike Feltman F1 Technologies
- 2. Agenda • What is AJAX • AJAX in 5 Minutes • AJAX Technologies • Talking AJAX to VFP • Putting it Altogether • AJAX Resources • AJAX vs. Classic Web Apps
- 3. What is AJAX • AJAX is not a technology, it’s an acronym for a collection of technologies. • AJAX is a development technique that allows web apps to provide a desktop app like user experience • AJAX = Asynchronous JavaScript + XML • Also Referred to as Web 2.0 and RIA (Rich Internet Applications)
- 4. AJAX Technologies • HTML & XHTML • CSS • DOM • XML & XSLT • XMLHTTP • JavaScript
- 5. HTML • lingua franca of the web • HyperText Markup Language • The “Content Layer” of a well designed website
- 6. XHTML • eXtensible HyperText Markup Language • HTML coded as well-formed XML • Emerging, modernized HTML standard supported by most browsers
- 7. CSS • Cascading Style Sheets • Mechanism for adding style (fonts, colors, formatting, etc.) to web documents.
- 8. DOM • Document Object Model • Object model for documents, not specific to HTML, but rarely used outside of that context • Supported by modern browsers
- 9. XML • eXtensible Markup Language • “Standard” data transport format for the web
- 10. XSLT • Extensible Stylesheet Language Transformations • Stylesheet Language for XML • Formatting Language for XML data/documents
- 11. XMLHTTP • Object that allows (asynchronous) communication with the server • Native Object in Mozzila Browsers • COM Object in Internet Exploder
- 12. JavaScript • Client Side Scripting Language • Supported by modern browsers • Dynamically Typed • Case Sensitive
- 13. Putting it altogether • HTML/XHTML – Content • CSS – Formatting • DOM & JavaScript – Client Side Code • XML – Data
- 14. The Missing Links • Server Programming • XML Enabled DBMS Language (SPL) – VFP – AFP, WebConnection, etc. – SQL Server – PHP – MySQL – XUL – Oracle – RUBY – DB2 – Java – Classic ASP – ASP.NET
- 15. AJAX Technologies Redux • HTML & XHTML • Server Programming • CSS Language • DOM • DBMS • XML & XSTL • XMLHTTP • JavaScript
- 16. Classic Web Application Model
- 17. Synchronous Web Application Model
- 18. AJAX Web Application Model
- 19. Asynchronous Web Application Model
- 20. Talking AJAX to VFP • AFP (Active FoxPro Pages), Web Connection or any other VFP server-side scripting technology will suffice • Can use classic ASP or ASP.NET but both go through COM with no benefit
- 21. VFP is the Ideal AJAX Server Language • Fast • Great Text Handling • Native DBMS • Great Connectivity • Royalty Free Deployment
- 22. AJAX in 5 Minutes 1. Attach a JavaScript function call to an event on an HTML object 2. Get XMLHttp Request Object 3. Start an AJAX request 4. Respond to the request on completion 5. Update the web page
- 23. Talking AJAX to VFP 1. Retrieving Data & Updating the page a. From a command button b. From a textbox c. Using XML 2. Putting it all together with VFP business objects
- 24. Real World Ajax • Glfc.net • Airset.com • http://script.aculo.us/ • http://openrico.org/ • http://dojotoolkit.org/ • http://prototype.conio.net/
- 25. Conclusion • AJAX can be used to provide desktop like user experiences • AJAX is actually old technology, but its uses and usability are evolving rapidly • VFP is well-suited for use in AJAX development
- 26. Resources • Blogs/Websites • Frameworks & Toolkits – adaptivepath.com – maxkiesler.com – blogs.pathf.com/agileajax – dojotoolkit.org – ajax.phpmagazine.net – prototype.conio.net – ajaxpatterns.com – script.aculo.us • Books – zk1.sourceforge.net – The JavaScript Anthology – rubyonrails.org – Pragmatic AJAX
- 27. Thank You • Please remember to fill out your evals