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AJAX
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A gentle introduction
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(very gentle)
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What is AJAX?
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Asynchronous
Javascript
And
XML
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Why?
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Interactive Web Apps
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No need to reload pages
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Less restrictive
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It is more a pattern...
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...than a technology
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Who? When?
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The first AJAX
application was
Outlook Web Access
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Adopted by Mozilla
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And Google
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Jesse James Garrett
from Adaptive Path
coined the name “AJAX”
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New technology?
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(not really)
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HTML + CSS
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DOM
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XMLHttpRequest
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JavaScript...
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...acting as the glue
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What for?
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Real-time form
validation
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Auto-completion
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Master-detail views
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... sophisticated UIs
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Happy users
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How?
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HTTP requests in the
background
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(lots of them)
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Asynchronously
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Callbacks in JavaScript
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readyState == 4 &&
request.status == 200
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responseText
responseXml
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Interactions
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Problems?
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Back button
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Bookmarks
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Confusing user
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More JavaScript!
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Difficult to debug
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Viewable source
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Browser support?
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Internet Explorer 5+
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Mozilla
Opera 9+
Apple Safari
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Web 2.0?
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AJAX ≠ Web 2.0
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AJAX < Web 2.0
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AJAX =
Core feature of Web 2.0
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Web as a platform
Collective intelligence
Multiple devices
Rich user experience
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Future?
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Books?
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And one more thing...
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Thank you!
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Questions?