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HTML_TreeMenuDocumentationIntroductionHTML_TreeMenuisasetofPHPclassestoenabletheeasycreationofHTMLbasedtreemenus.
ItcurrentlyhastheabilitytocreatebothDHTML,staticandlistboxmenus.
AllhavetheprerequisiteofJavascript,howevertheJavscriptcodecouldbeusedmanually,withoutthePHPclasses.
AuthorsHTML_TreeMenuwaswrittenbyRichardHeyesandHaraldRadi.
Contributions/patcheshavealsobeenreceivedandincorporatedfromvariouspeople.
FeaturesEasytolearnOObasedAPIDHTML(traditional)orlistbox()outputstylesMultiplemenusperpageCrossbrowserDOMcompatibleDHTMLOptionalbranchstatuspersistenceusingcookiesOptionalstaticmodewithoutDHTML(stillrequiresJavascriptsupport)Pernodeiconwithalternate"expanded"iconPernodeCSSclassspecificationPernodelinktargetsPernodeJavascripteventspecificationwithcustomonExpand,onCollapseandonToggleeventsAbilitytospecifyfrommenucreationifanodeisexpandedbydefault,andifitshouldbemadetobevisible(ieitsparentsareexpanded)StructureOverviewTherearefiveclassesintotal:HTML_TreeMenuThe"toplevel"treeclass.
HTML_TreeNodeThenodeclass.
HTML_TreeMenu_PresentationAnabstractbaseclassforthenexttwoclasses.
HTML_TreeMenu_DHTMLProducesaDHTMLstylemenu.
HTML_TreeMenu_ListboxProducesalistboxmenu.
TheHTML_TreeNodeclassisusedtocreatethestructurewhichisaddedtoaninstanceoftheHTML_TreeMenuclass.
Thisisinturnpassedtoaninstanceofeitherofthepresentationclasses(DHTMLorListbox).
Thesetwo"presentation"classeshaveaprintMenu()methodwhichcanbecalledtoprinttheresultingmenu.
ExampleSeetheexample.
phpfileforthecode.
Thiscodemakesasimplemenuwithtworootnodes,eachwithfivenestednodes.
ThecodegoesaboutcreatingtheinitialHTML_TreeMenuobject,andthencreatesthenodestobeadded.
Thenodesarethenaddedtothemenuobject,whichitselfisthenpassedtoaninstanceoftheHTML_TreeMenu_DHTMLobject(throughtheconstructor)andalsoanHTML_TreeMenu_Listboxobject.
ThenfollowssomeHTMLinwhichtheprintMenu()methodofeachpresentationobjectiscalledtoshowthemenus.
NotetheuseofreferenceswhenassigningthereturnofaddItem().
Failuretoassignbyreferencewillcauseproblems.
APIReferenceHTML_TreeMenuMethods&addItem(object&$node)ThismethodisusedtoaddaHTML_TreeNodetothetree.
IttakesaHTML_TreeNodeasitssoleargumentandreturnsareferencetothenodeinsidetheTreeMenuobject.
createFromStructure(array$params)Thismethodisanextremelyusefuloneifyoualreadyhaveatreestructuredefinedusingoneofthesupportedtreeclasses.
Ittakessaidtreestructureandreturnsatreemenubaseduponit.
Thistakestheworkoutoftraversingyourtreeandcreatingthestructureyourself.
ThesupportedtreestructuresareRichardHeyes'Treeclass(http://www.
phpguru.
org/tree.
html)andWolframKriesings'TreeclassavailablethroughPEARhttp://pear.
php.
net/Tree.
The$paramsargumentshouldbeanassociativearraywhichcanconsistofthefollowing:structureThetreestructuretypeThetype.
Defaultsto'heyes'.
Canalsobe'kriesing'.
nodeOptionsDefaultHTML_TreeNodeoptionswhichareusedwhilstbuildingthemenu.
InthecaseofmyownTreeclass,thesewillbemergedwiththetagdata.
ThereturnvalueistheHTML_TreeMenuobject.
createFromXML(mixed$xml)ThismethodwillcreateanHTML_TreeMenuobjectfromthesupplied$xmlargument.
ThisargumentcaneitherbeastringcontainingtheXML,oraPEAR::XML_Treeobject.
Iftheargumentisastring,themethodwillattempttorequire()theXML_TreeclassusingstandardPEARtechniques(ie:require_once('XML/Tree.
php')),andthencreateanXML_Treeobjectbasedonthestring.
ThemethodwillthenconverttheXML_TreeobjecttoaTreeclassusingmyownTreeclass(availablehere:http://phpguru.
org/tree.
html)sothisfile(Tree.
php)MUSTbeinclude()edorrequire()edbeforecallingthismethod.
IftheTreeclasscannotbefound,thismethodwilldie().
Onceconverted,themethodwillthenusethecreateFromStructure()methoddescribedabovetocreateanHTML_TreeMenuobjectandreturnit.
ForfurtherinformationonusingthismethodandtheXMLschemaseethecasestudybelow.
HTML_TreeNodeMethodsConstructor([array$options[,array$events]])Theconstructorhandlessettingupthenodeobjectbasedontheoptionssupplied.
The$optionsargumentshouldbeanassociativearraywhichcanconsistofthefollowing:textTitleofthenode,defaultstoblank.
linkHREFofthelink,defaultstoblank.
iconFilenameoftheicon.
Shouldbeintheimagesdirectoryassuppliedtothepresentationobject.
expandedIconFilenameoftheicontobeusedwhenthenodeisexpanded.
classCSSclassforthisnode,defaultstoblank.
expandedDefaultexpandedstatusofthisnode.
Defaultstofalse,andhasnoeffectonnondynamicpresentations.
linkTargetTargetforthelink.
DefaultstolinkTargetofthepresentationclass.
isDynamicIfthisnodeisdynamicornot.
Defaultstotrue.
ensureVisibleIftrue,thisnodewillbemadevisibleregardlessoftheexpandedsettingsandclientsidepersistence.
Defaultstofalse.
ThesecondargumentisanassociativearrayofJavascripteventsandassociatedhandlercode.
Thiscanalsoincludethreecustomevents:onexpand,oncollapse,andontoggle,whichshouldbeselfexplanatory.
Thisargumentcouldalsobesuppliedastheeventskeyinthefirstargument.
setOption(string$option,mixed$value)Usethismethodtosetanyoftheoptionsafterthenodehasbeencreated.
Theoptionnamesarethesameasthoseintheconstructor,andtakesimilarvalues.
&addItem(object&$node)ThisissimilarineveryrespecttotheaddItem()methodoftheHTML_TreeMenuclassandisusedtoaddchildnodes.
HTML_TreeMenu_DHTMLMethodsConstructor(&$structure[,array$options[,$isDynamic]])Thissetsupthepresentationobjectwiththegivenstructureandoptions.
ThestructureshouldbeanHTML_TreeMenuobject.
Theoptionsargumentshouldbeanassociativearray,andcanconsistofthefollowing:imagesThefoldertolookinforimages.
Defaultsto"images".
linkTargetTargetforanylinks.
Canbesethereinsteadofforeverynode.
Defaultsto"_self".
defaultClassDefaultCSSclasstouse.
Defaultstoblank.
usePersistenceWhethertouseclientsidepersistenceornot(withcookies).
Defaultstotrue.
noTopLevelImagesWhethertoskipthedisplayofthefirstlevelofbranchimagesiftherearemultiplerootnodes.
Defaultstofalse.
Thethridargument$isDynamiccanbeusedtospecifyWhethertheentiretreeisdynamicornot.
Defaultstotrue.
printMenu([$options])ThisisamethodinheritedfromtheabstractHTML_TreeMenu_Presentationclassandisusedtoprintthemenu.
Theoptionalargument$optionsshouldbeanassociativearraywhichcanconsistofthesameoptionsasthe$optionsargumentoftheconstructor.
HTML_TreeMenu_ListboxMethodsConstructor(&$structure[,array$options])Thissetsupthepresentationobjectwiththegivenstructureandoptions.
ThestructureshouldbeanHTML_TreeMenuobject.
Theoptionsargumentshouldbeanassociativearray,andcanconsistofthefollowing:promoTextThetextthatappearsatthetopofthelistbox.
Defaultsto"Select…"indentCharThecharacterusedtoindentthenodes.
Defaultsto" ".
indentNumHowmanyindentCharstouseperindentationlevel.
linkTargetTargetforanylinks.
Canbesethereinsteadofforeverynode.
Defaultsto"_self".
submitTextTextforthesubmitbutton.
Defaultsto"Go".
printMenu([$options])ThisisamethodinheritedfromtheabstractHTML_TreeMenu_Presentationclassandisusedtoprintthemenu.
Theoptionalargument$optionsshouldbeanassociativearraywhichcanconsistofthesameoptionsasthe$optionsargumentoftheconstructor.
Casestudy:CreatingatreemenuusingXMLTheHTML_TreeMenu::createFromXML()methodisanextremelyusefuloneifyouhaveatreemenutomaintainandwishtodosoinsimplerfashionthanupdatingPHPcodeeverytimeachangeisneed.
TheXMLcanbekeptinafileandreadintocreatethemenu,withlittlemorethanafewlinesofPHPcodenecessary.
Pros:VeryeasytomaintainLittlecodingrequiredbyyouNolossofcontroloverpresentationbywayofXMLtagattributesCons:SlowerAsaresultof:Increasedamountofincludedcode(Treeclass,XML_Treeclass,XML_Tree_Nodeclass,XML_Parserclass)XMLparsingthedecreasedspeedissignificantenoughtowarrantcachingoftheresultingHTML_TreeMenuobject,eitherinausers'sessionorperhapsafilebasedcache.
(PEARhasacoupleofcandidates–Cache&Cache_Lite).
IfyoudocachethetreeMenu,thenit'sentirelyconcievablethatitmayendupbeingfasterthanbuildingitinPHPeverytime,sothespeeddrawbackbecomesanon-issue.
TheXMLschemayoushoulduseconsistsoftwotags,and.
Thetagistherootelementandthereshouldonlyeverbeoneofthese.
Thetagdefinesanodeinthetreeandcanbenestedasmuchasyouwant.
ThetagcantakeasattributesanyoftheoptionswhichcanbepassedtotheHTML_TreeNodeconstructor(eg.
text,link,iconetc).
SomeexampleXML:Asyoucanseeit'sperfectlyOKtousetheXMLshortcutinsteadofifanodehasnochildnodes.
ThisXMLwillcreateatreeMenuwithfiverootnodes,withthefourthhavingfourchildnodes.
ThecodeyouwouldneedtousetocreatetheHTML_TreeMenuobjectisasfollows:You'rethenfreetousethe$treeMenustructurewitheitherofthepresentationclassesasnormal.
LicenseThepackageisdistributedundertheBSDlicense.
Wishlistfulfilmentisalwaysappreciatedofcourse:RichardHeyeshttp://phpguru.
org/wishlistHaraldRadihttp://www.
amazon.
com/.
.
.

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