ajax in action live search using xslt

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1、iTePub.Net-CollectLivesearchusingXSLTThischaptercovers■Dynamicsearchtechniques■UsingXSLTtotranslateXMLtoHTML■Bookmarkingdynamicinformation■Buildingalivesearchcomponent466LicensedtojonathanzhengiTePub.Net-CollectUnderstandingthesearchtechniques467WithAjax,it’seasytoperform

2、server-sideactionswhilecontrollingwhatishap-peningontheclient.Ifaprocesstakesanextendedperiodoftime,wecanshowanimatedGIFsthatdisplaymessagesthatlettheuserknowwhat’shappening.Theusercanperformotheractionswhiletheserver-sideprocessistakingplaceandwillbelesslikelytothinkthatthebrowserhasfrozen.

3、Inthischapter,weusethisAjaxtechniquetocreatealivesearch.ItutilizesExtensibleStylesheetLanguageTransformations(XSLT)totransformanXMLdocumentintoanHTMLlayout.TheXSLTtranslationiseasiertomaintainthanthecodetomanuallyparsetheXMLandproduceHTMLusingJavaScriptstate-ments.Itusesatree-orientedtransfo

4、rmationonadynamicallygeneratedXMLdocument,whichreplacestheserver-sidecodeandtheJavaScriptonwhichthepreviousprojectsrelied.WeareeliminatingthehasslesofmanuallymakingsurethatalltheHTMLelementsareformedproperly.Aswithpreviousexamples,wefirstdevelopthecodeinastraightforwardwayandthenrefactoritin

5、toareusablecomponent.Bytheendofthischapter,youshouldunderstandtheprinciplesofusingXSLTwithAjaxandhaveaready-rolledsearchcomponentthatyoucandropintoyourownprojects.12.1UnderstandingthesearchtechniquesWhenweperformsearches,weareaccustomedtoseeingthepagefreezewhilethesearchisconductedontheserve

6、r.(Atleast,thisisthecaseonwebsitesthatdonothave1,200clusteredserversthatperformasearchover8billionpagesinlessthanasecond.Thebudgetconstraintsofyourprojectmayvary.)Toeliminatethepause,somedevelopersimplementpop-upwindowsandframes.Theadditionalwindowisusedtoperformtheprocessingsotheuser’sexper

7、iencecanbeenhanced,butthisalsocreatesproblems.WithAjax,wecaneliminatethecom-mondelaysoftheclassicformandframesubmissions.12.1.1LookingattheclassicsearchInaclassicsearchprocess,whenweincludeasearchformonourwebsite,oneormoreformelementsarepostedbackt