Attr

The Attr interface represents an attribute of an Element object. Allowable values for this object are usually defined in some sort of document type definition. The Attr object is also a Node and as such inherits a number of that object's properties and methods. However, an attribute is not considered by the DOM to be a child node of an element, but rather a property of it, and so cannot have a value other than null for the parentNode, previousSibling or nextSibling properties.

The value of an attribute is represented by the child nodes because the value can contain entity references. Where this is the case the child list will contain both text and entityReference nodes. Because the attribute type may be unknown, there are no tokenized attribute values.

For details of the values returned by the nodeName, nodeType and nodeValue properties for an Attr, see the Node object.

Examples

Code:

XML:



<States>


    <State
ref="FL" const="27">


       <name>Florida</name>


       <capital>Tallahassee</capital>


    </State>


    <State
ref="IA" const="29">


       <name>Iowa</name>


       <capital>Des Moines</capital>


    </State>


 </States>



VBScript:




Set objXMLDoc = CreateObject("Microsoft.XMLDOM")


 objXMLDoc.async = False


 objXMLDoc.load("states.xml")



 Set objFirstChild = objXMLDoc.documentElement.firstChild


 Set objAttributes = objFirstChild.attributes


 For Each Attr in objAttributes


    document.write(Attr.name &  " ")


    document.write(Attr.value & "<br>")


 Next

Output:

ref FL

 const 27

Explanation:

This example uses the 'states.xml' file and creates a NamedNodeMap of the attributes of the first child of the root element. The code then displays their name and value properties.

Language(s): VBScript XML

Properties

attributes

Syntax: node.attributes

This is a read-only property that returns a NamedNodeMap for nodes that can have attributes.

baseName

Syntax: document.basename

This is a read-only property that returns the base name for a node.

childNodes

Syntax: node.childNodes

This is a read-only property containing a node list of all children for those elements that can have them.

dataType

Syntax: node.dataType

This is a read-only property that specifies the data type for the node.

definition

Syntax: node.definition

This property returns the definition of the node in the DTD or schema.

firstChild

Syntax: node.firstChild

This is a read-only property that returns the first child node of a node. If there is none, it returns null.

lastChild

Syntax: node.lastChild

This is a read-only property that returns the last child node of a node. If there is none, it returns null.

name

Syntax: attr.name

This property returns the name of the attribute, and is the same as the nodeName property for this Node object.

namespaceURI

Syntax: object.namespaceURI

This property is read-only and returns the URI (Universal Resource Indentifier) of the namespace.

nextSibling

Syntax: node.nextSibling

This property returns the next node in the parent's child list, or null if there is none or the node is of a type that cannot be a child node (Attr, Document, DocumentFragment).

nodeName

Syntax: node.nodeName

This property is read-only and contains the name of the node, depending on type.

nodeType

Syntax: node.nodeType

This property is read-only and contains the name of the node, depending on type.

nodeTypedValue

Syntax: node.nodeTypedValue

This property contains the value of this node expressed in its defined data type.

nodeTypeString

Syntax: node.nodeTypeString

This property is read-only and returns the node type in string form.

nodeValue

Syntax: node.nodeValue

This property contains the value of the node, depending on type.

ownerDocument

Syntax: node.ownerDocument

This property returns the Document object to which the node belongs. If the node itself is a document, then it returns null.

parentNode

Syntax: node.parentNode

This is a read-only property that returns the parent node of all nodes except Document, DocumentFragment and Attr, which cannot have parent nodes.

parsed

Syntax: node.parsed

This property returns a boolean value of true if this node and all of its descendants have been parsed and instantiated. Otherwise it returns false.

prefix

Syntax: object.prefix

Property This property is read-only and returns the namespace prefix, or an empty string if none is specified. For example, it would return 'xxx' for the element xxx:yyy.

previousSibling

Syntax: node.previousSibling

This property returns the previous node in the parent's child list, or null if there is none or the node is of a type that cannot be an child node (Attr, Document, DocumentFragment).

specified

Syntax: node.specified

This property returns a boolean value which indicates whether or not this attribute has a value specified in the XML document.

text

Syntax: node.text

This property contains the text content of this node and its subtrees.

value

Syntax: attr.value

This property returns the value for the attribute.

xml

Syntax: node.xml

This property contains the XML representation of this node and its descendants.

Methods

appendChild

Syntax: node.appendChild(tagName)

This method appends a new child node to the list of children for this node.

cloneNode

Syntax: node.cloneNode(deep)

This method creates a clone node which is an exact replica of this node.

hasChildNodes

Syntax: node.hasChildNodes

This method is a convenient way to determine whether a node has child nodes, returning true if it has, and false if not.

insertBefore

Syntax: node.insertBefore(newChild, refChild)

This method is used to insert a new child node before an existing one. If no child node exists, the new child node becomes the first.

removeChild

Syntax: node.removeChild(oldChild)

This method removes the specified node from the list of children and returns it.

replaceChild

Syntax: node.replaceChild(newChild, oldChild)

This method is used to replace one of a node's children with another. It returns the old child.

selectNodes

Syntax: node.selectNodes(patternString)

This method creates a NodeList of all matching descendant nodes returned by the specified pattern-matching operation.

selectSingleNode

Syntax: node.selectSingleNode(patternString)

This method returns an object for the first descendant node to match the specified pattern.

transformNode

Syntax: node.transformNode(stylesheet)

This method processes this node and its descendants using the specified XSL stylesheet, and returns the resulting transformation.

transformNodeToObject

Syntax: node.transformNodeToObject(stylesheet, outputObject)

This method processes this node and its descendants using the specified XSL stylesheet, and returns the resulting transformation in the specified object.

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