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Blood on the Keyboard

Blood on the Keyboard. Experiences in developing Rich Internet Applications. Brendan Lawlor, DSI. Decare Systems Ireland. Based in Bishopstown, Cork. 150+ 140+ actually writing code for a living Java and .NET Enterprise Intranet Applications E-commerce Internet Applications. Themes.

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Blood on the Keyboard

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  1. Blood on the Keyboard Experiences in developing Rich Internet Applications. Brendan Lawlor, DSI.

  2. Decare Systems Ireland • Based in Bishopstown, Cork. • 150+ • 140+ actually writing code for a living • Java and .NET • Enterprise Intranet Applications • E-commerce Internet Applications

  3. Themes • Rich Internet Application development • Creative Development, XHTML, CSS, Javascript. • AJAX – a small but vital part of RIA development. • DSI’s experience in building RIAs.

  4. RIA Philosophy: Before Javascript Sucks

  5. RIA Philosophy: After Javascript Still Sucks -but DOJO makes it a lot less sucky

  6. Why DOJO? We needed a safer way to use Javascript. JSF ?

  7. JSF The RIA Platform GWT DOJO CSS XHTML JS Browser

  8. What is DOJO? • It is a set of JavaScript libraries • Handles browser incompatibilities • Hides XMLHttpRequest processing • Provides for the building of Widgets • AOP in JavaScript!

  9. DOJO packages • dojo.widget • dojo.event • dojo.io dojo.require(“dojo.widget.*”);

  10. DOJO Libraries: dojo.widget <select class=“cb”> <option value=“Java">java</option> <option value=“Script">script</option> <option value=“Still">still</option> <option value=“Sucks">sucks</option> </select>

  11. ComboBox.html <select class=“cb” dojoType=“ComboBox”> <option value=“Java">java</option> <option value=“Script">script</option> <option value=“Still">still</option> <option value=“Sucks">sucks</option> </select>

  12. ComboBox.css .cb{ position: relative; top: 0px; }

  13. ComboBox.js dojo.provide(“ComboBox"); … dojo.widget.defineWidget( “ComboBox”, templatePath:/ComboBox.html templateCssPath:/ComboBox.css … //Event-Driven Behaviour

  14. Creating the Widget <div dojoType=“ComboBox">

  15. DOJO packages • dojo.widget • dojo.event • dojo.io

  16. DOJO Libraries: dojo.event • RIA = component-based, event-driven • JS Events = cross-browser hell • DOJO = cross-browser event management • Also abstracts over all events.

  17. DOJO packages • dojo.widget • dojo.event • dojo.io

  18. DOJO Libraries: dojo.io • Abstracts the XMLHttpRequest • Everything is a ‘bind’ dojo.io.bind({ url: "http://foo.bar.com/read", load: function(type, data, evt){ /*read something*/}, mimetype: "text/json“ formNode: dojo.byId(“myForm”) });

  19. How we use DOJO

  20. Natural Habitats We have a dedicated creative team: • No advantage of Java over Javascript. • They could work on both server platforms using DOJO alone. • Unity of platform gives unity of standards.

  21. DOJO and Presentation Process. Pictures Wireframes WF & data

  22. JS Controller read.json Read read.json Edit Controller edit.json .html Search Struts Actions Our DOJO Architecture

  23. Summary • What we liked • What we hated • What we’re gonna do about it • What we wish somebody else would do

  24. What did we like? • Easy access for our creative staff • Very little change from Struts actions downwards • JS widgets are more easily reusable • Client development without the server!

  25. read.json read.json read.json C:\test .html Look Ma – No Server!

  26. What did we dislike? • Widgets on Internet Explorer 6 • DOJO 0.3 and IE6: a match made in Hell • Irresistible force meets immovable object

  27. What Next? • DOJO 0.9 just released • Hopefully will deal with IE6 problem

  28. Final thoughts • Just another view on how to write RIAs. • Not an attempt to say that DOJO is better. • Whatever framework we use, we need to live with JS. • Would somebody write a JS GUI builder already!?

  29. Resources and Credits • DSI: Paul Sheehan, Michal Bali, Conor Goulding • Sun: Sang Shin (Introduction to Dojo Toolkit) • http://dojotoolkit.org • http://blog.decaresystems.ie

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