Sama_Ajax.ppt

7/27/2019 Sama_Ajax.ppt

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CIS764 1

AJAXIs it a cleanser or a bleach?

Haritha Reddy Sama

CIS 764

InstructorDr.Bill Hankley


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Overview

Introduction to AJAX

Advantages

Popular Applications

Disadvantages- the other side of thecoin


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Introduction to AJAX

What is AJAX a technique to process userrequest immediately

Why AJAX

more time for sever toprocess the request


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How does it work

Delayed responsedue to processingby server

Immediateresponse


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Advantages

Interface is more responsive

Waiting time is reduced

Page encounters an error- applications

fails graciously

Traffic to and from server is reduced bandwidth usage is most likely to

decrease


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Some Popular AJAX Apps

Google maps:(richer desktop interaction methods like Zoom

in/Zoom out are possible)

Google suggest:(Auto-completion)

Google calendar:(Improved performance and smoother responses)

Flickr photo sharing:(Multiple Interactions due to asynchronous

communication)


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The other side of the coin


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SEO Rhetoric - Dont use AJAX

When pages with Ajax are indexed, the datadisplayed by Ajax calls is not present in the

page workarounds are required to get dynamic Ajax

content indexed

its simply not there in the page

Content rendered via AJAX is done via

javascript Search engine spiders cannot invoke javascript

events to retrieve AJAX content


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Disadvantages

Increased development time and costs

Available frameworks and components still

need to completely mature

Not all concerns regarding security anduser privacy have been answered

Conflicts in modern browsers - navigateand create bookmarks


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Disadvantages (contd..)

Not meant to be used in every application

Concern of accessibility

XMLHttpRequest object itself


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Workarounds - Go on an AJAX diet

Use hidden divs rather than Ajax Search engines will index the content

Need AJAX content to be indexed

Provide hidden links that can be spidered

Limit the complexity of the logic Javascript-free Ajax

AJAX should be limited to providing a better userexperience through RIAs ( Rich InternetApplications)


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Conclusions

Keeping the advantages anddisadvantages in mind one has to choosewhether or not to have AJAX to retrieve

the content/data in their application.


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References

AJAX Patterns Web site which has plethora ofajax examples

http://ajaxpatterns.org/

Presentation by Paul Buremmer from REDDOOR on AJAX

http://www.semphonic.com/conf/AJAX_Paul_Bruemmer.pdf

An article - Is AJAX right for my project?

http://www.interaktonline.com/Support/Articles/Details/AJAX%3A+Asynchronously+Moving+Forward-Is+AJAX+right+for+my+project%3F.html?id_art=36&id_asc=310
http://www.semphonic.com/conf/AJAX_Paul_Bruemmer.pdfhttp://www.semphonic.com/conf/AJAX_Paul_Bruemmer.pdfhttp://www.semphonic.com/conf/AJAX_Paul_Bruemmer.pdfhttp://www.semphonic.com/conf/AJAX_Paul_Bruemmer.pdf


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Questions?

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