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Finally,ifyou dliketocommentyourJavaScript,youcanuse//beforeanysingle- linecomment.Formultilinecomments,you llusethesametypeofcommentsyou veseenusedinCSS,asfollows: IfyouwantedtolinktotheJavaScript,youwouldplacethescriptitself,althoughyoucanusecomments)intoaseparatetextfileandnameit,using.jsasthesuffix. Inyour(X)HTMLpage,placethescriptelementandincludethesourcetoyourJavaScriptfile,asfollows: noteWhileitisrecommendedthatyouplacemostscriptsexternaltoyoursourceHTMLfiles(andIheartilyagree),I veshownmanyscriptsinthischapterinembeddedform.Ididthisforthesakeofclarity,soyoucouldseethescriptandcorrespondingXHTMLinonelocation.Ifyou dliketomoveascriptoutofthedocument,youcandosobyusingthemeansdescribedearlierthischapter. UsingRichMediaTheterm richmedia hasemergedtodefineenhancedmediaontheWeb.cally,thismeansthemediarunsinline,suchasFlash,orviaaJavaapplet,Richmediaoftenusesmarkup,scripting,andclient-servertechnologiestoenhanceandextendwhatwetypicallythinkofasmultimedia. Flashhasbecomeverywidespread;atonetimeitwasfeltitmighteven takeover asthedefactomeansofcreatingWebsites.Flashhasbecomeaverysophisticated
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X)HTMLelementsviaDOM.resultinginmoredynamicoptionsforthepagedesigner. JavaScriptisalsooneofthecornerstonesofDynamicHTML(DHTML).trarytoitsname,DHTMLisnotalanguage,itisacombinationoftechnologies: (X)HTML,CSS,sScripting,andDOM. noteDOMisstandardized,too,butincorrectsupportforDOMinbrowsershascausedalotofcross-browserdifficulties.TheW3CoverseesstandardizationofDOMisatwww.w3.org/DOM/. SomegeneralJavaScriptrulestorememberincludethefollowing: JavaScriptiscasesensitive. It spossiblethatevenifsomeoneisusingaJavaScript-enabledbrowsertheJavaScriptisturnedoff,soyouneedtoplanyourdesignstodegradegracefully. JavaScriptcodecanbecommentedoutsoolderbrowsersdon ttrytodisplaythecode. InbothHTMLandXHTML,JavaScriptcanbeplacedasfollows: Embeddedinascriptelementintheheadelementofadocument JavaScriptisplacedinanexternaldocumentwithasuffixof.jsandisreferencedfromthedocumentusingthescriptelement. PortionsofJavaScriptmayappearwithinscriptelementsinsidethebodyofyourdocument,orattachedtointrinsicevents. noteRememberthatinXHTML,intrinsiceventsmustbewritteninlowercase, suchasonclick,insteadofothercaseformsincludingthecommonlyusedcamelcase,onClick. Toembedascript,youplacethescriptinbetweenthescriptelementsintheheadportionofanHTMLorXHTMLdocument,asfollows: You llnoticethatI veincludedthetypeattributewiththetext/javascriptvalue.Thisisrequired,butoftenleftout.Ontheotherhand,you lloftenseethelanguage=”javascript”attributeinthescriptelement.ThisisokayinHTMLandXHTMLTransitional,butnotinstrictdocumenttypedefinitions(DTDs)So,Ijustleaveoutthelanguageattributeinallcases,butalwaysincludethetypeattribute.Thispracticeshouldcausenochangeinthebehaviorofthescriptinanycontemporarybrowsers. Ifyou dliketohidecodefromthosebrowsersnotsupportingJavaScript,youcandosousingthefollowingcommentstylearoundyourscript.NotethatthisisslightlydifferentthanconventionalHTMLcomments,whichdonotusethedoubleslash(//)priortoclosingthecomment:
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Overtheyears,lotsofscriptingandmultimediahavebeenusedontheWeb, butinoftenhaphazardways lotsofcut-and-pastescripts,noattentiontoprofessionalpractices,andnotmuchconsiderationastothewhyandwhenofintegratingscriptingandmediaintoasite.Still,thereareverypowerfulreasonstousescripting,audio,andvideo insomecases,entiresitesaredependentontheseformsofinteractivetechnologiestoproperlyservetheiraudienceneedsandthesite sgoals. Thischapterfocusesonsomeofthemostcommonandsensibleapproachestoscriptingandmedia,whenandwhyyoushouldscript,andhowtoensurethatyourdocumentsremainasclean,well-structured,andstandardizedaspossible. AllaboutScriptingandRichMediaScriptingistypicallyusedtorefertoJavaScript,althoughIcoverother,includingstandardizedscriptingandtheDocumentObjectModel(DOM).IalsodiscussRichMedia,apopulartermusedtodescribemediawith rich features,suchasFlash,animations,video,andaudio. JavaScript,ECMAScript,andDOMNetscapesetouttocreateaninteractivescriptingenvironmentforitsbrowser. OriginallyknownasLiveScript,SunMicrosystems,whoatthetimewasdevelop- ingitsJavalanguage,decidedtoworkwithNetscapetopackagethetwotogether. ThisresultedinthenamechangefromLiveScripttoJavaScript. TheinterestinscriptingwithinbrowsersinturnspawnedmovementonMicrosoft sparttocomeoutwithitsownvariant,JScript.MicrosoftalsopromotedVisualBasicScript(VBScript)forawhiletobeusedlikeJavaScriptwithinWebdocuments, butthatfelloutoffavorbecauseitwasn tcross-browsercompatible.whichisconsideredthestandardizedformofscriptingfortheWeb. noteToreadmoreaboutECMAScript,seewww.ecma-international.ECMAisafast-trackstandardsbodyworkingonarangeofstandardsrelatedtocommunicationstechnology. EventhoughmuchoftheworkgoingonwithscriptingtodayhasitsrootsinEC- MAScript,wewilllikelybereferringtothisformofscripting,whetherstandardizedornot,as JavaScript foraverylongtimetocome. noteIt simportanttounderstandthedifferencebetweenJavaandJavaScript. UnlikeJava,whichisacomplexprogramminglanguagewithapplicationsbothontheWebandbeyond,JavaScriptisaninterpretedscriptthatintegrateswithWebdocuments.JavaScript,unlikeJava,whichiscompiled,by-linebythebrowser. Today,JavaScriptisusedtoaccomplisharangeofWeb-basedtechniques,ingthecreationofpop-upwindows,mouseoveranimations,aswellasbrowserdetectionandpre-cachingofimages,allinhopesofmakingtheuserexperiencemoreinteractive.
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SecretsinThisChapter#202:ProvidingtheCurrentDate………………………203:DoingPopupsProperly………………………..204:RandomizeImagesandText……………………..205:OpenaNewWindowWithouttarget…………………206:CheckforPlug-Ins………………………….207:TextSizeSwitching………………………….208:StyleSheetSwitchingforVisualDesign……………….209:DynamicMenuSystems……………………….210:FormsValidationwithJavaScript…………………..211:TheTroublewithapplet,object,andembed……………..212:AddingFlashandComplyingwithStandards…………….213:AddingAudio…………………………….214:AddingVideo…………………………….215:AboutDigitalStorytelling………………………
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TherenderingofSVGisbasedonapaintmodel.Color,gradients,andpatternsarepaintedontothescreentogaintheendresults.Shapesandtextcanbefilledorstroked.Othergraphictechniques,suchasmaskingandopacity,canallbeapplied. SVGalsoallowsaccesstoscriptingandtotheDOM,whichishowSVGsupportsanimationsandinteractivegraphics. AninterestingaspecttoSVGisthatthescalablemethodologyisrenderedviaXML,ratherthanusingabinarygraphicfile.TheexceptiontothisiswheneverabitmappedgraphicisusedwithinanSVGenvironment,theimageisincludedusingtheSVGimageelement. SVGis,asonecanimagine,quitecomplexinitssyntax.Andthemorecomplexadesignbecomes,themorecomplextheresultingmarkupbecomes.Asaresult, thedevelopmentofgraphicaluserinterface(GUI)toolsforSVGbeganearly. SeveralofthesetoolsareavailablethatofferastandarddrawingenvironmentbutexporttoSVGforuseinsupportedbrowsers.Inaddition,manyfamiliargraphiccompaniesandgraphicdesignproductsareaddingSVGexportsupporttotheirproductlines. noteToreadthecurrentSVGspecificationandupdatesaboutSVGattheW3C, visitwww.w3.org/Graphics/SVG/. TheAdobeSVGZone,atwww.adobe.com/svg/main.html,hasexcellentexamples,tools,tutorials,andup-to-dateSVGbrowserplug-ins. SummaryWhileitmayseemthatnotmuchhaschangedinvisualdesignfortheWeb,cantadvanceshavebeenmadeinthetoolsweuse:bettercompressionforgraphicsandmoreoptionstoo,withimprovedPNGsupportandtheemergingSVGimple- mentations.Techniqueshaveadvanced largelybecauseofCSSandourabilitytorelyonittoimprovehowweusegraphicsandcolorwithinoursites.Finally,derstandingthepsychology,culture,andgenderissuesinvolvedinvisualdesignandcolor,wecangainbettercontroloverhowoursitesareperceivedbyothers. Next,you lllearnhowtoworkwithJavaScript,DHTML,andothermediatomakeyoursitesmoreexpressive.
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Beawareofthisissuewhenyouchoosecontrastcolors. Speakingofcontrast,makecertainanyimportanttextcontentonyoursitecontrastswellwiththebackgroundcolorsinuse.Whilesubtlecontrastcanmakeforinterestingdesign,youwanttotakecaretoensurethatthecontentisreadable. Typicallyspeaking,youdonotneedtorestrictcoloringraphicstoWeb-safecolor.IfyouhavefewcolorsandaresavingtoGIFformat,Don tattempttosavephotosasWeb-safecolors. Secret#201:ExploringScalableVectorGraphicsScalableVectorGraphics(SVG)isanapplicationofXML.Viamarkup,animations,andinteractivegraphicdesignscanbedesignedandimple- mentedforWebviewing.Ofcourse,browsersmustsupportthetechnology,SVGisbeingdevelopedundertheauspicesoftheW3C.Asaresult,includingthefollowing: XML XSLT CSS2 DocumentObjectModel(DOM) SMIL HTML XHTML SufficientaccessibilityoptionsviatheWebAccessibilityInitiative(andWebContentGuidelines(WCAG) PerhapsthemostimportantconceptwhenstudyingSVGisthatitisscalable.Likevectorgraphics,withoutdistortionofthegraphic. Thisisespeciallyimportantfordesigningacrossresolutions.Scalablegraphicsadjusttotheavailablescreenresolution.ThisalonemakesSVGveryattractivetodesigners,asitsolvesoneofthemostfrustratingissuesweface:creatingdesignsthatareasinteroperableyetvisuallyrichaspossible. SVGelementsarebasedonstandardgraphicdesignelements.Theyareasfollows: Geometricshapes.Ageometricshapeisaline,combinationoflines,orcombinationofcurves,oracombinationofcurvesandlines. Text.Textelementsarerepresentedascharactersandcombinationsofcharacters. Raster(alsoreferredtoasbitmapped)images.Rastergraphicsarethosethataremappedtobits.Thismeansthattheydonotcontainscalablemethods.Rastergraphicsaretypicallyusedincombinationwithscalablegraphics,andarecomprisedofphotographsandspecialtyfilters.
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Secret#199:ColorandGenderTheperceptionofcolorisnotonlyinfluencedbyourownpsychologyandculture, butbyourgendertoo.Men sandwomen sreactionstocoloraresignificantlydifferentand,whencombinedwithculturalissues,thechallengebecomesquitecomplex. Afewinterestingitemsaboutgenderandcolorfollow: Bluestandsoutformenmuchmorethanforwomen. Menpreferbluetored,womenredtoblue. Menpreferorangetoyellow,womenyellowtoorange. It salsobelievedatthispointinourunderstandingofcolorperceptionthatwomen scoloridentificationandawarenessofcolorsubtletytendstobmorediversethanmen s. Incolorstudieswheremenandwomenwereaskedtolistallthecolorstheycouldthinkof,womenwereabletoconsistentlylistmorecolorsthanmencould. Whileit sfartooearlytocometoconclusionsaboutwhethertheseareactualdifferencesinperceptionormerelyculturalinfluencesonwomenresultit scertainlyinterestingtothinkabout. Moreimportantly,thatgenderplaysaroleintheperceptionofcolorindicatesthattocommunicateeffectivelyWebdesignersmustknowtheiraudienceaswellaspossibl. Secret#200:ColorTipsBecauseofthecomplexrelationshipshumanshavewithcolor,afewguidelinesastowhattoavoidoruseinagivencircumstancecanbehelpful.Hereareafewtipstohelpyoumakegooddecisionswhenitcomestocolorinthecontextofglobaldesign. Firstandforemost,knowyourtargetmarket.Knowingdemographicinformationaboutyoursitevisitorswillhelpyoumakedecisionsregardingcolorandpsychology,colorandgender,andcolorandculture. Becauseblueisthemostuniversallyacceptablecolor,youcanuseitinalmostanysituation. Pinkisanoddcolorwithwhichtoworkinaglobalenvironment.forexample,willlikelyseepalepinksorotherpastelcolorsasbeingfeminine.Yet,fortheJapanese,pastelcolorsareverypopularforbothsexes. Rememberthataddingtexturewillchangeacolor.Soifyou recreatingagraphicfromablue-greenandaddatexturethatmakesitlookmorebluethangreen,workfromtheresultingcolor,nottheinitialcolor. Aphenomenonreferredtoassimultaneouscontrastistheresultofonecolorbeingplacedondifferentbackgrounds,andasaresult,the
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4:CulturalSignificancesandColorColorCulturalsignificanceRedInChina,redisusedtoexpresscelebrationandgoodluck. Combinedwithwhite,thepowerofbothcolorsincreasesthesignificance.IntheUnitedStatesandmanypartsofEurope, redcanrepresentprostitution,asin redlight districtsBlueInterestingly,blueisconsideredthemostsafecolortousearoundtheglobebecausetherearenoknownnegativeculturalconnotations.InChina,thecolorrepresentsimmortality.FortheJews,blueisaholycolor.InHinduism, blueisthecolorofthegodKrishnaGreenInmanycultures,greenisseenasverycalminganduplifting.OnecautionforU.S.designersusingcolorforglobalaudiencesistonotassociategreenwithmoney whichofcourseiscommonintheUnitedStatesbecauseallofourpapermoneyisgreen.Thisisactuallyquiterare,asmostcountriesaroundtheworldusemulticoloredpapermoneyanddonotassociategreenwithwealthorfinanceYellowInChina,yellowisanimperialcolor.InWesterncultures, yellowisoftenassociatedwithhappiness,children,InCatholicEurope,ithashadalongassociationwithmourninganddeath.IntheUnitedStatesandmanyothercultures,purpleisrelatedtomysticism,newage,andalternativereligions.InpartsoftheMiddleEast,purpleisassociatedwithprostitution.It snotsurprisingtolearnthatpurpleisfoundinnatureveryinfrequently. OrangeInproductpackaging,particularlyintheUnitedStates, orangeisusedtoexpresscheaporinexpensive.Asaresult, itshouldbeavoidedinsitesattemptingtoexpressluxuryandeleganceBrownWhilenotaswidespreadinpositiveconnotationsasthecolorblue,brownisaveryneutralcolorandisalmostalwaysassociatedwithnatureGray/silverGrayisusedworldwideasaneutralcolor.Silvertonestendtoexpresssophisticationandtechnology,atleastatthistimeinhistory. WhiteWhilesoverycommonlyusedforcontrastindesign,Inmostwesterncultures,whiteisasymbolofsalvation,holiness,andpurity.Butinsomewesternandmanyeasterncultures,whiterepresentsdeathandmourningBlackBlackalsohasaprofoundculturalparadox:itisthecolorofdeathandmourninginmanycultures,representingalsothedarkspiritworldandevil.Incontrast,blackhaslongbeenassociatedwitheleganceandsophistication,especiallyincosmopolitan,prosperous,andprogressiveareasoftheworld
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Colorvaluesaregoingtomakeadifference,too.Aneongreenwillelicitadifferentemotionalresponsethanadeepforestgreen.Also,aswithshapes,thecombinationofcolorsmeansevenmorecomplexemotionalresults. So,designersinterestedinmakingsurethattheyareusingcorrectcolorstoconveytheirmeaningtoaudiencesmusthaveawarenessbothofgeneralcolorpTable11-3describescommoncolorsandcommonpsychologicalresponses.standingthegeneralsignificanceofagivencolor andanyrelatedparadoxes canhelpyoumakebettercolorchoicesforyourdesigns. Table11-3:CommonColorsandRelatedMeaningsColorMeaningRedPower,energy,love,warmth,passion,aggression,dangerBlueTrust,conservative,security,technology,cleanliness,sorrow,earth,health,goodluck,jealousy,renewal,moneyYellowOptimism,joy,hope,philosophy,dishonesty,cowardice,mystery,royalty,power,transformation,cruelty, arrogance,homosexualityOrangeEnergy,balance,warmthBrownEarth,reliability,comfort,enduranceGray/silverIntellect,futurism,elegance,modesty,sadness,decayWhitePurity,cleanliness,precision,innocence,sterility,deathBlackPower,sexuality,sophistication,mystery,fear,unhappiness, Secret#198:ColorandCultureMuchoftheparadoxofcolorpsychologycomesoutofthemixingofculturalper- ceptions.InTable11-4,I veprovidedyouwithcolorquirksbornofsocialissues. Thiscanhelpyouselectoravoidcolorsbasedonyouraudienceandtheculturalinfluenceswithinthataudience. noteForanamazingWebsiteresourceoncolor,includingcolorandtheWeb,colormatters.com/.ThesiteismaintainedbyJ.L.Morton,culture, andtheWebformanyyears.
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drivencolorstocreatedesignsthatareinnovativeandcolorful,yetdownloadquicklybecauseyou reusingCSSwhereverpossibletomanagecolorratherthanweightygraphics. Secret#196:TheSymbolicMeaningofShapesShapesplayanimportantroleinconveyinginformationwithoutwords.icons,orotherexpressivevisualcomponentswithinadesign. Table11-2showsthreebasicshapesanddefinestheirgeneralconveyedmeaning. Table11-2:TheSymbolicMeaningofShapesShapeMeaningRectangleRectanglesandsquarestypicallyrepresentauthority, stability,andstrength.Manydesignsattemptingtoconveyreliabilityandconsistencyofaproductwilluselines,rectangles,andsquaresCircleCirclestypicallyrepresentcommunity,fluidmovement, andthefeminine.ManycommunityWebsites,ordesignswishingtoconveyflexibilityandexpressionwillusecurvesandcirclesTriangleTrianglesrepresentaction,movement,anddirection, andareassociatedwiththemasculine.Designswishingtoexpressmovementandpurposemayuseangles,arrows,andtriangularshapesnoteForinterestingexamplesofshapesinworldsymbology,seewww.symbols.net/. Ofcourse,shapescanbecombinedtoextendameaning.AclearexampleofthisisthefamousFedExarrow,whichisacombinationofarectangleandatriangle, indicatingstable,forwardmovement. Secret#197:ThePsychologyofColorAswithshape,colorshavespecificpsychosocialresponses.What sespeciallyin- terestingisthatasinglecolorcanhaveparadoxicalresponses.Ifyouseeredonastopsign,it sawarning,signifyingpotentialdanger.Butaredheartmeansloveandpassion.
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