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chapter16.lyx
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chapter16.lyx
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#LyX 1.5.6 created this file. For more info see http://www.lyx.org/
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\begin_body
\begin_layout Chapter
AJAX and COMET
\end_layout
\begin_layout Standard
AJAX and COMET in Lift
\end_layout
\begin_layout Standard
* What is AJAX? http://en.wikipedia.org/wiki/Ajax_(programming)
\end_layout
\begin_layout Standard
AJAX (asynchronous JavaScript and XML) is a group of techniques that allow
for interactive web applications.
Using AJAX applications can talk to the server asynchronously and therefore
not disrupt the display of the client.
(this is awkward)
\end_layout
\begin_layout Standard
* why is AJAX awesome? [example]
\end_layout
\begin_layout Standard
Ajax allows for a much richer interface for a web application, and example
is Google Suggest.
When you start typing your search term, the word fragment is sent to the
server and common completions of your term are sent back.
\end_layout
\begin_layout Standard
* Method for async updates pulled from the client without a full page reload
\end_layout
\begin_layout Standard
* Relies heavily on javascript and XML
\end_layout
\begin_layout Standard
* Javascript client-side events (button push, timer, etc) trigger requests
"behind the scenes"
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\begin_layout Standard
* Web 2.0 built on this
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\begin_layout Standard
* Using AJAX in Lift
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\begin_layout Standard
* Allows you to bind Javascript events (AJAX) to form elements, links, etc
\end_layout
\begin_layout Standard
* Go through example HelloDarwin AJAX example
\end_layout
\begin_layout Standard
* What is COMET? http://en.wikipedia.org/wiki/Comet_(programming)
\end_layout
\begin_layout Standard
Comet is a method that uses long-polling to keep a connection between a
browser and a server open, to allow the server to push data to the browser.
An example of this would be a Stock Ticker.
A user may have a page open that has a number of stock prices and as the
price changes, the new value is pushed to the broswer without the need
to refresh the page.
Another example is the embedded Google Talk chat client in GMail.
Instant messages from friends are automatically pushed to your browser.
\end_layout
\begin_layout Standard
* Push to the browser
\end_layout
\begin_layout Standard
* [Example] following a LiveBlog of a keynote presentation, elememts are
pushed to your browser
\end_layout
\begin_layout Standard
* Here's a super simple example - http://wiki.liftweb.net/index.php/CometActor
\end_layout
\begin_layout Standard
* Method for async updates pushed
\end_layout
\begin_layout Standard
*from server to client*
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* Connection is kept open
\end_layout
\begin_layout Standard
* Streaming
\end_layout
\begin_layout Standard
* Long polling
\end_layout
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* Scalability issues
\end_layout
\begin_layout Standard
* Using COMET in Lift
\end_layout
\begin_layout Standard
* CometActor
\end_layout
\begin_layout Standard
* Mine Jorge's blog post: http://scala-blogs.org/2007/12/dynamic-web-applications
-with-lift-and.html
\end_layout
\begin_layout Standard
* Go through Dynamic chat room example
\end_layout
\end_body
\end_document