XMLDOM大全1Dom Objects introduce.docx

XMLDOM大全1Dom Objects introduce.docx

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XMLDOM大全1DomObjectsintroduce

MicrosoftDOMObjectsTableofContents

Overview

DOMobjects

1.DOMDocument

2.XMLDOMElement

3.XMLDOMNode

4.XMLDOMNodeList

5.XMLDOMNamedNodeMap

6.XMLDOMCDATASection

7.XMLDOMAttribute

8.XMLDOMDocumentType

9.XMLDOMEntity

10.XMLDOMProcessingInstruction

11.XMLDOMParseError

XMLHTTPRequest

DOMobjectproperties（pleaseseeanotherDocument）

1.async

2.Attributes

3.childNodes

4.data

5.docType

6.documentElement

7.length

8.namespaceURI

9.nodeName

10.nodeType

11.The12Nodetypes

12.nodeTypedValue

13.nodeTypeString

14.nodeValue

15.ondataavailable

16.ownerDocument

17.parentNode

18.parsed

19.parseError

20.prefix

21.preserveWhiteSpace

22.resolveExternals

23.tagName

24.text

25.url

26.validateOnParse

27.value

DOMobjectmethods（pleaseseeanotherDocument）

1.abort（）

2.appendChild（）

3.cloneNode（）

4.createAttribute（）,createCDATASection（）,createComment（）,createElement（）,createEntityReference（）,createProcessingInstruction（）,createTextNode（）

5.createNode（）

6.getAttribute（）

7.getAttributeNode（）

8.getElementsByTagName（）

9.getNamedItem（）

10.hasChildNodes（）

11.insertBefore（）

12.load（）

13.loadXML（）

14.nextNode（）

15.nodeFromID（）

16.removeAttribute（）

17.removeAttributeNode（）

18.removeChild（）

19.removeNamedItem（）

20.replaceChild（）

21.reset（）

22.save（）

23.selectNodes（）

24.selectSingleNode（）

25.send（）

26.setAttribute（）

27.setAttributeNode（）

28.setNamedItem（）

29.transformNode（）

30.transformNodeToObject（）

MicrosoftDOMDocumentObjectTutorial

XMLProgrammingwithVBandASPgivesaVB/ASPdeveloperafrom-the-ground-upstarttoXMLandXMLprogramminginVBandASP.Funtoreadandeasygoing,thisisano-frillsbookwhichgetsrighttothepoint.MoreadvancedtopicsincludeBizTalk,schemas,webclassesandXSL.

Whatthischapterofthebookcovers:

✶DescriptionsoftheMicrosoftXMLobjects

✶Samplecodeformostofthemethodsandproperties

✶Easy-referencetableguidetotheobjects

Overview

MicrosofthasshippedsomeveryusefulobjectswithIE5thatcanbeusedfromanyprogramminglanguagethatcanmakeuseofCOMobjects.Inthispartofthebook,wewillfocusontheXMLDOMobjectsusingVBorVBScript.

TobetterunderstandcodeordescriptionsoftheDOMDocument,trytothinkofanXMLdocumentasatree.Anotherusefulanalogyistothinkofparentsandtheirchildren.

TobetterunderstandcodeordescriptionsabouttheDOM,trytothinkofanXMLdocumentasatree.Anotherusefulanalogyistothinkofparentsandtheirchildren.Westartwiththeactualrootofthedocument,thenitmeandersdowntoeachprocessinginstruction,thedocumentrootelement,attributes,etc.TheseobjectsintheDOMareknownbythereowntype（e.g.,Element,Attribute,etc.）,buteachtypeisgenerallycalledaNode.TheDOMgivesuscollectionsobjectsaswell,knownasNodeListswhenaparenthasmanychildrenthatneedtobegrouped.Figure describeshowthetreestructureisimplemented:

Thischapter,whilecomprehensive,shouldnotbeusedasacompletereference.

TheXMLDOMObjectimplementstheXMLDOMinterfaces.TheseinterfacesmakereusabilitythroughouttheDOMpractical.Becausethesetwoobjectssharethesameinterfaces,thecodebecomeseasiertounderstandandworkwith,whichwewillseeinashortwhile.

DOMobjects

Firstweneedtoexplainthevarious,commonDOMobjectsthatyouwillusewiththeMSXMLDOMObject.

WewillfocusontheexamplesoftheseXMLDOMobjectsshownintable .

0.0.1XMLDOMObjects

Objectname

Description

DOMDocument

ThisobjectrepresentstherootoftheXMLfile.

XMLDOMElement

ThisobjectrepresentseachelementintheDOM-Document,namelytheroot,rootelement,andeachotherelement.

XMLDOMNode

ThisobjectrepresentsasingleNodeinthedocumenttreeandincludessupportfordatatypes,namespaces,DTDs,andXMLSchemas.

XMLDOMNodeList

Usethisobjecttoaccess（byname）anditeratethroughtheXMLDOMNodecollection.

XMLDOMNamedNodeMap

Usethisobjecttoaccessanditeratethroughtheattributesinanelement.

XMLDOMCDATASection

ThisobjectrepresentsasectioninthevalueofanelementthatisclosedintheCDATAsectionbrackets,whicharecharactersthatcannotbeparsedbytheXML.

XMLDOMAttribute

ThisobjectrepresentsasingleattributeNodeforagivenelement.

XMLDOMDocumentType

ThisobjectrepresentstheDocumentType（DTD）inanXMLfile.

XMLDOMEntity

ThisobjectrepresentsanentityintheDTDsectionoftheXMLfile.

XMLDOMProcessingInstruction

ThisobjectrepresentsaprocessinginstructionfoundintheXMLfile.

XMLDOMParseError

Thisobjectreturnsdetailedinformationaboutthelasterror,includingthelinenumber,characterposition,andatextdescription.

XMLHTTPRequest

Thisobjectenablesyoutoestablishaconnectiontoawebserverfromyourcodeandsendput,get,andotherstandardHTMLrequests.

Inourexamples,wewillrefertotheseobjectsusingthenameslistedintable .

0.0.1XMLobjectnamingconventions（continued）

XMLobjectinterface

Ournamingconvention

DOMDocument

objDOMDocument

XMLDOMNode

objXMLDOMNode

XMLDOMNodeList

objXMLDOMNodeList

XMLDOMNodeListMap

objXMLDOMNodeListMap

XMLDOMParseError

objXMLDOMParseError

XMLDOMElement

objXMLDOMElement

XMLDOMAttribute

objXMLDOMAttribute

ThismanuscriptisanabridgedversionofachapterfromtheManningPublicationsbookXMLProgrammingwithVBandASP.ThischapterlooksattheMicrosoftDOMobjects.NOTE:

Mostimageshavebeenremovedtoincreasespeedandmanyofthecodecommentshavealsobeenremovedforpresentation.Pleasepurchasethebooktoenjoythefullexperienceofallthechapterswithimagesandcodecomments!

DOMDocument

TheDOMDocumentobjectrepresentstherootoftheXMLfile.AsthefileisloadedintotheDOMDocument,theXMLfileanditsexternalreferences,suchasDTDs,getvalidatedbytheDOMDocument.

TheDOMDocumentisthefirstportofcalltotheXMLfile.Thisistheonlyobjectthatcanbecreated.Alltheotherobjects,liketheelements,canonlybecreatedoraccessedfromtheDOMDocumentobject.

Example

ThisexampleloadsanXMLfileintoaDOMDocumentobject:

DimobjDOMDocumentAsDOMDocument

SetobjDOMDocument=NewDOMDocument

objDOMDocument.async=False

objDOMDocument.Loadhttp:

//localhost/xmlcode/people2.dtd

XMLDOMElement

ThisobjectrepresentseachelementintheXMLtree.TheXMLDOMElementincludessupportformanipulatingtheelementandtheattributesassociatedwiththeelement.

TheattributesassociatedwithanelementareaddedandmanipulatedviatheXMLDOMElementobject.

Example

ThefollowingexamplereturnstherootelementoftheXMLfilefromaDOMDocument:

DimobjDOMDocumentAsDOMDocument

DimobjXMLDOMElementAsIXMLDOMElement

SetobjDOMDocument=NewDOMDocument

objDOMDocument.async=False

objDOMDocument.Load"http:

//localhost/xmlcode/people2.dtd"

SetobjXMLDOMElement=objDOMDocument.documentElement

XMLDOMNode

ThisisoneofthebaseobjectsoftheDOM.MostoftheotherDOMobjectsinheritthisobject;therefore,youwillseealotofpropertiesandmethodsrepeatedineachoftheseobjects.

Theseobjectsare:

✶DOMDocument

✶XMLDOMAttribute

✶XMLDOMCDATASection

✶XMLDOMComment

✶XMLDOMDocumentFragment

✶XMLDOMDocumentType

✶XMLDOMElement

✶XMLDOMEntity

✶XMLDOMEntityReference

✶XMLDOMNotation

✶XMLDOMProcessingInstruction

✶XMLDOMText

✶XTLRuntime

AlthoughalltheseobjectsinheritmethodsandpropertiesfromtheXMLDOMNodeobject,theywillallalsohavepropertiesandmethodsthatareuniquetotheirfunction.Forexample,theXMLDOMElementobjecthasextramethodsforobtainingattributeinformation.TheXMLDOMNodeinterfaceprovidesjustthebasicinformation,likethenameoftheNode,itstext,etc.

ToknowwhichtypeofNodeiscurrentlybeingaccessed,thenodeTypepropertyreturnswhichtypeofNodeyouarereferencingwhenusingtheXMLDOMNodeobject,whichisexplainedindetaillaterinthischapterunderthenodeTypeproperty.

Also,seethedocTypepropertyformoreinformationonDualinterfaces.Thisexplainshowtocastfromonetypeofobjecttotheother.

Example

ThefollowingexampleisthesameastheexamplefromtheXMLDOMElement,exceptitnowusestheXMLDOMNodeobjecttoreturntherootelementoftheXMLfilefromaDOMDocument.

DimobjDOMDocumentAsDOMDocument

DimobjXMLDOMNodeAsIXMLDOMNode

SetobjDOMDocument=NewDOMDocument

objDOMDocument.async=False

objDOMDocument.Load"http:

//localhost/xmlcode/people2.dtd"

SetobjXMLDOMNode=objDOMDocument.documentElement

XMLDOMNodeList

TheXMLDOMNodeListobjectisacollectionofNodes.ItsmethodsallowustoiteratethroughallthechildrenNodesofaNode.YoucanusetheForEach...Nextloopforthisiteration.However,youcanalsochoosetoiteratethroughtheseNodesusingitsmethodofnextNode（）.

Thisobjectisreturnedintheproperty,suchaschildNodes,ormethodssuchasgetElementsByTagName（）andselectNodes（）.

Example

ThefollowingexampleusesthechildNodespropertyoftheDOMDocumenttoreturnthechildrenNodesoftherootelementoftheDOMDocument.（FormoredetailsseethechildNodesproperty,whichalsoshowsanexampleofhowtoiteratethroughtheXMLDOMNodeListcollection.）

DimobjDOMDocumentAsDOMDocument

DimobjXMLDOMNodeListAsIXMLDOMNodeList

SetobjDOMDocument=NewDOMDocument

objDOMDocument.async=False

objDOMDocument.Load"http:

//localhost/xmlcode/people2.dtd"

SetobjXMLDOMNodeList=objDOMDocument.documentElement.childNodes

XMLDOMNamedNodeMap

ThisistheothercollectionobjectintheDOM.Itisusedtoiteratethroughtheattributesforaspecificelement.Italsoallowsyoutomanipulatetheattributecollectionforanelement.Tonameaf