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Echo2
Java AJAX Web Framework
Petar Milev
Contents
1. Introduction to Echo2
2. Echo2 Target – Business Web
3. Why Choosing Echo2?
4. Live Demo
5. How It Works?
6. Conclusion
7. Links
8. Components (screenshots)
Introduction to Echo2
- Echo2 is a Web Framework for Java
- It is AJAX-enabled
- Helps developing rich business web
applications
- The code can be written entirely on the server
side, using only Java
- Doesn’t require any additional build phases
Echo2 Target – Business Web
- What business web means here?
- When developing the presentation – focus on
the functionality rather on the visual design
- Visual design is also very flexible
Why Choosing Echo2?
- Easies the development – makes web
applications simple
- Forget about legacy paradigms like pageorientation, request-response, etc.
- Rich AJAX application without any additional
effort
- Use just Java code for the whole presentation
layer
- Easy to support software
Echo2
Live Demo
How It Works? (part 1)
- On the first request, Echo2 JavaScript engine
is sent to the client (specific for the browser)
- From now on, Echo2 engine handles
everything for us
- On a user interaction it automatically notifies
the server (if needed) and calls our eventhandling Java code
- The Echo2 server engine generates
appropriate XML response which is handled
by Echo2 JS engine and DOM is updated
How It Works? (part 2)
Step 1: User presses a button
Step 2: If there is ActionListener attached, the
Echo2 JS engine sends the event to the
server:
<client-message
xmlns="http://www.nextapp.com/products/echo2/clim
sg" trans-id="4">
<message-part processor="EchoAction">
<action component-id="c_8” name="click"/>
</message-part>
</client-message>
Conclusion
- Alternative for developing contemporary web
applications with no real alternative for other
platforms/languages
- Introducing very simple approach
- Increases team efficiency
- Appropriate for large software applications
- Very mature with state of a proven framework
Links
Echo home page: http://echo.nextapp.com/site/ find demos, tutorials, builds and source code
Wiki: http://wiki.nextapp.com/echowiki - many
useful resources and links
EchoPointNG:
http://wiki.nextapp.com/echowiki/EchoPointNG -
library with many additional Echo2 components
Echo2GO:
http://wiki.nextapp.com/echowiki/Echo2Go everything you need to make echo2 app in 15
minutes
Widgets (screenshots) part 1
Standard components:
Widgets (screenshots) part 2
Layouting components:
Vertical split pane
Popup window
Widgets (screenshots) part 3
Windows and popups:
Customizable tabpane
Customizable
image borders
Color
chooser
Widgets (screenshots) part 4
More components:
Menus
Accordion pane
Charts:
Pie/Pie 3D
Bar/Bar 3D
Third Party Widgets
You get even more fancy components with
EchoPointNG (LGPL) library
• AutoLookupTextField
• BalloonHelp
• Calculator
• DateChooser
• HistoryMonitor
• ImageMap
• LiveTable
• RichTextArea
• Tree
• TreeTable