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1、iTePub.Net-CollectAnewdesignfortheWebThischaptercovers■Asynchronousnetworkinteractionsandusagepatterns■ThekeydifferencesbetweenAjaxandclassicwebapplications■ThefourfundamentalprinciplesofAjax■Ajaxintherealworld3LicensedtojonathanzhengiTeP
2、ub.Net-Collect4CHAPTER1AnewdesignfortheWebIdeally,auserinterface(UI)willbeinvisibletousers,providingthemwiththeoptionstheyneedwhentheyneedthembutotherwisestayingoutoftheirway,leavingusersfreetofocusontheproblemathand.Unfortunately,thisisaveryhardthingtogetri
3、ght,andwebecomeaccustomed,orresigned,toworkingwithsuboptimalUIsonadailybasis—untilsomeoneshowsusabetterway,andwerealizehowfrustratingourcurrentmethodofdoingthingscanbe.TheInternetiscurrentlyundergoingsucharealization,asthebasicwebbrowsertechnologiesusedtodis
4、playdocumentcontenthavebeenpushedbeyondthelimitsofwhattheycansanelyaccomplish.Ajax(AsynchronousJavaScript+XML)isarelativelyrecentname,coinedbyJesseJamesGarrettofAdaptivePath.SomepartsofAjaxhavebeenpreviouslydescribedasDynamicHTMLandremotescripting.Ajaxisasna
5、ppiername,evokingimagesofcleaningpowder,Dutchfootballteams,andGreekheroessufferingthethroesofmadness.It’smorethanjustaname,though.ThereisplentyofexcitementsurroundingAjax,andquitealottogetexcitedabout,frombothatechnologicalandabusi-nessperspective.Technologi
6、cally,Ajaxgivesexpressiontoalotofunrealizedpotentialinthewebbrowsertechnologies.GoogleandafewothermajorplayersareusingAjaxtoraisetheexpectationsofthegeneralpublicastowhatawebapplicationcando.Theclassical“webapplication”thatwehavebecomeusedtoisbeginningtocrea
7、kunderthestrainthatincreasinglysophisticatedweb-basedservicesareplac-ingonit.Avarietyoftechnologiesarelininguptofillthegapwithricher,smarter,orotherwiseimprovedclients.Ajaxisabletodeliverthisbetter,smarterrichnessusingonlytechnologiesthatarealreadyinstalledo
8、nthemajorityofmoderncomputers.WithAjax,wearetakingabunchofdustyoldtechnologiesandstretchingthemwellbeyondtheiroriginalscope.Weneedtobeabletomanagethecom-plexitythatwehaveintroduced.Thisbookwilld
