8 | S
TARTING
S
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other custom widgets – all which needed processing logic to
perform their tasks.
To address these complexities, component based frameworks
have become popular. They provide a close tie between user
interface components and classes that represent the components,
and they are event-driven and more object orientated than action
based frameworks. A component could be a HTML input field,
a HTML form or custom widgets provided by or created for the
framework. Events, such as form submits or links, are mapped
to methods of the class representing the component, or to special
listener classes. An additional benefit of component based
frameworks is that they allow you to re-use components across
multiple web applications. Examples of component based
frameworks are JSF, Wicket and Tapestry.
The Great Equalizer – Ajax
In the beginning of 2005, a new fascination was starting in web
development. Coined by Jesse James Garrett, Ajax stood for
“Asynchronous JavaScript and XML.” Relatively speaking, the
technologies were nothing new. In fact, the primary web
browser components for making the asynchronous calls – the
XMLHttpRequest
Object – had already been available for 6 years
(since version 5 of Internet Explorer).
But what was new was the application of the technology.
Google Maps was one of the first applications to take full
advantage of the technology. The web page had come alive –
you could interact with controls and widgets. By using a mouse
you could scroll maps around the screen; when entering an
address, the information would materialize above the maps
images; and finally, the culmination being route planning which
orchestrated all these features into a useable web application.
And all of this happened without a single page refresh!
User interfaces with Ajax functionality allows the web browser
to make requests to the server for smaller amounts of
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