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INNOV-7: Building a Richer UI for the Browser Chris Skeldon Senior Solution Consultant.

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Presentation on theme: "INNOV-7: Building a Richer UI for the Browser Chris Skeldon Senior Solution Consultant."— Presentation transcript:

1 INNOV-7: Building a Richer UI for the Browser Chris Skeldon Senior Solution Consultant

2 © 2007 Progress Software Corporation 2 INNOV-7 Building a Richer UI for the Browser Agenda  Why?  Glossary  Things to consider  Code What we are going to cover

3 © 2007 Progress Software Corporation 3 INNOV-7 Building a Richer UI for the Browser Why?  Work within and between companies  Work through firewalls  Low deployment and support costs  Platform independent  Allow global collaboration BUT-  ‘click ‘n wait’ – poor UI for business apps However-  We can do better than this… The browser is becoming platform of choice:

4 © 2007 Progress Software Corporation 4 INNOV-7 Building a Richer UI for the Browser WebSpeed ® Architecture User Agent WebSpeed Transaction Server WebServer WebSpeed Messenger WebSpeed Broker WebSpeed Agent X/HTML CSS JavaScript ABL Procedures

5 © 2007 Progress Software Corporation 5 INNOV-7 Building a Richer UI for the Browser Glossary  XHTML Defines document structure  Cascading style sheets (CSS) Defines presentation of document  JavaScript Adds dynamism  DOM In memory model of page Key terms to start with:

6 © 2007 Progress Software Corporation 6 INNOV-7 Building a Richer UI for the Browser XHTML  Standards body – W3C ( www.w3.org)  Current recommendation: XHTML 1.1  Valid XML can be validated can be transformed  Controls browser mode - quirks v. standards  Standards mode recommended more consistent quicker Gives document its structure:

7 © 2007 Progress Software Corporation 7 INNOV-7 Building a Richer UI for the Browser Browser modes  Quirks v. standards mode (+almost)  IE & Firefox rely on ‘Doctype Sniffing’: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" …  Version 9: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" … Rendering modes:

8 © 2007 Progress Software Corporation 8 INNOV-7 Building a Richer UI for the Browser CSS  Standards body – W3C ( www.w3.org)  Current recommendation: CSS 2  Defines ‘what it looks like’ – colours & fonts backgrounds layout – size and position...  Can be manipulated with JavaScript Defines a document’s appearance:

9 © 2007 Progress Software Corporation 9 INNOV-7 Building a Richer UI for the Browser JavaScript  Standards body – ECMA ( www.ecma- international.org)  Current edition: ECMA-262 3 rd Edition  Based on JavaScript and JScript  Beware of extensions  The J of AJAX ECMAScript - makes the page dynamic:

10 © 2007 Progress Software Corporation 10 INNOV-7 Building a Richer UI for the Browser DOM Document Object Model:  Models the document as a tree of software objects – i.e. have data and behaviour  “… application programming interface (API) for valid HTML and well-formed XML documents” - W3CHTMLXML  Use with JavaScript to: Locate elements Create new elements

11 © 2007 Progress Software Corporation 11 INNOV-7 Building a Richer UI for the Browser Glossary (cont.)  AJAX Asynchronous JavaScript And XML  JSON JavaScript Object Notation  XMLHTTPRequest Use with JavaScript to call a server More terms:

12 © 2007 Progress Software Corporation 12 INNOV-7 Building a Richer UI for the Browser AJAX  A new approach, not new technology  Coined by Jesse James Garrett, February 2005  Enables server call without full page reload  Goal: provide rich UI in a browser  Needs JavaScript  Does not need XML, may not be asynchronous Asynchronous JavaScript And XML:

13 © 2007 Progress Software Corporation 13 INNOV-7 Building a Richer UI for the Browser JSON  “lightweight data-interchange format” - www.json.org  Subset of JavaScript  JSON v. XML: each has pros and cons  Expected to be in 4 th Edition of ECMA-262 Until then - http://www.json.org/json.js JavaScript Object Notation:

14 © 2007 Progress Software Corporation 14 INNOV-7 Building a Richer UI for the Browser XMLHTTPRequest  Built into most modern browsers  Enables request to a URL using HTTP  Asynchronous or synchronous  Response format up to developer Usually XML or JSON  Needs JavaScript Built in object to call server:

15 © 2007 Progress Software Corporation 15 INNOV-7 Building a Richer UI for the Browser ABL v. JavaScript DEFINE VARIABLE iRmNo AS INTEGER NO-UNDO. DEFINE VARIABLE cName AS CHARACTER NO-UNDO. Variables: var rmNo = 11; name = “Chris”;

16 © 2007 Progress Software Corporation 16 INNOV-7 Building a Richer UI for the Browser ABL v. JavaScript FUNCTION bookRoom RETURNS LOGICAL (INPUT piRoom AS INTEGER, INPUT pcName AS CHARACTER):... RETURN TRUE. END FUNCTION. Functions and parameters: function bookRoom(room, name) {... return true; }

17 © 2007 Progress Software Corporation 17 INNOV-7 Building a Richer UI for the Browser ABL v. JavaScript DEFINE VARIABLE i AS INTEGER NO-UNDO. DEFINE VARIABLE iRooms AS INTEGER EXTENT 5 NO-UNDO. DO i = 1 TO EXTENT(iRooms): IF iRooms[i] = piRoom THEN... END. Loops, arrays, if and operators: var rooms = new Array(); for(var i = 0; i < rooms.length; i++) { if(rooms[i] == room)... }

18 © 2007 Progress Software Corporation 18 INNOV-7 Building a Richer UI for the Browser ABL v. JavaScript DEFINE BUTTON btFetch. ON CHOOSE OF btFetch DO: END. Events and triggers (aka event handlers): element.onclick = fetch; element.onclick = function () {... };

19 © 2007 Progress Software Corporation 19 INNOV-7 Building a Richer UI for the Browser Before you start  Which browsers & versions  Accessibility  Standards  Internationalisation  Use of JavaScript? No Yes, but must work without Yes Things to consider:

20 © 2007 Progress Software Corporation 20 INNOV-7 Building a Richer UI for the Browser Code…

21 © 2007 Progress Software Corporation 21 INNOV-7 Building a Richer UI for the Browser Resources  INNOV-10 Getting Started with AJAX  www.openajax.com www.openajax.com  www.crockford.com www.crockford.com  www.prototypejs.org www.prototypejs.org  dojotoolkit.org dojotoolkit.org  developer.yahoo.com/yui developer.yahoo.com/yui Useful places to visit:

22 © 2007 Progress Software Corporation 22 INNOV-7 Building a Richer UI for the Browser Summary What we have seen:  Base technologies: XHTML, CSS, DOM, JavaScript  Role of JavaScript in your application?  Use of JavaScript enables rich UIs in web apps AJAX techniques XML, JSON

23 © 2007 Progress Software Corporation 23 INNOV-7 Building a Richer UI for the Browser Questions?

24 © 2007 Progress Software Corporation 24 INNOV-7 Building a Richer UI for the Browser Thank you for your time

25 © 2007 Progress Software Corporation 25 INNOV-7 Building a Richer UI for the Browser

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