Attr extension type

The Attr interface represents one of an element's attributes as an object. In most situations, you will directly retrieve the attribute value as a string (e.g., Element.getAttribute), but some cases may require interacting with Attr instances (e.g., Element.getAttributeNode).

The core idea of an object of type Attr is the association between a name and a value. An attribute may also be part of a namespace and, in this case, it also has a URI identifying the namespace, and a prefix that is an abbreviation for the namespace.

The name is deemed local when it ignores the eventual namespace prefix and deemed qualified when it includes the prefix of the namespace, if any, separated from the local name by a colon (:). We have three cases: an attribute outside of a namespace, an attribute inside a namespace without a prefix defined, an attribute inside a namespace with a prefix:

Attribute	Namespace name	Namespace prefix	Attribute local name	Attribute qualified name
myAttr	none	none	myAttr	myAttr
myAttr	mynamespace	none	myAttr	myAttr
myAttr	mynamespace	myns	myAttr	myns:myAttr

Note: This interface represents only attributes present in the tree representation of the Element, being a SVG, an HTML or a MathML element. It doesn't represent the property of an interface associated with such element, such as HTMLTableElement for a table element. (See for more information about attributes and how they are reflected into properties.)

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API documentation sourced from MDN Web Docs.

on

• JSObject

Implemented types

• Node
• JSObject

Available extensions

• JSAnyOperatorExtension
• JSAnyUtilityExtension
• JSObjectUnsafeUtilExtension
• NodeGlue
• NullableUndefineableJSAnyExtension

Properties

baseURI → String

The read-only baseURI property of the Node interface returns the absolute base URL of the document containing the node.

no setter, inherited

childNodes → NodeList

The read-only childNodes property of the Node interface returns a live NodeList of child Node of the given element where the first child node is assigned index 0. Child nodes include elements, text and comments.

no setter, inherited

firstChild → Node?

The read-only firstChild property of the Node interface returns the node's first child in the tree, or null if the node has no children.

no setter, inherited

hashCode → int

The hash code for this object.

no setter, inherited

isConnected → bool

The read-only isConnected property of the Node interface returns a boolean indicating whether the node is connected (directly or indirectly) to a Document object.

no setter, inherited

isDefinedAndNotNull → bool

Available on JSAny?, provided by the NullableUndefineableJSAnyExtension extension

no setter

isNull → bool

Available on JSAny?, provided by the NullableUndefineableJSAnyExtension extension

Whether this value corresponds to JavaScript null.

no setter

isTruthy → JSBoolean

Available on JSAny?, provided by the JSAnyOperatorExtension extension

The result of !!this in JavaScript.

no setter

isUndefined → bool

Available on JSAny?, provided by the NullableUndefineableJSAnyExtension extension

Whether this value corresponds to JavaScript undefined.

no setter

isUndefinedOrNull → bool

Available on JSAny?, provided by the NullableUndefineableJSAnyExtension extension

no setter

lastChild → Node?

The read-only lastChild property of the Node interface returns the last child of the node, or null if there are no child nodes.

no setter, inherited

localName → String

The read-only localName property of the Attr interface returns the local part of the qualified name of an attribute, that is the name of the attribute, stripped from any namespace in front of it. For example, if the qualified name is xml:lang, the returned local name is lang, if the element supports that namespace.

no setter

name → String

The read-only name property of the Attr interface returns the qualified name of an attribute, that is the name of the attribute, with the namespace prefix, if any, in front of it. For example, if the local name is lang and the namespace prefix is xml, the returned qualified name is xml:lang.

no setter

namespaceURI → String?

The read-only namespaceURI property of the Attr interface returns the namespace URI of the attribute, or null if the element is not in a namespace.

no setter

nextSibling → Node?

The read-only nextSibling property of the Node interface returns the node immediately following the specified one in their parent's Node.childNodes, or returns null if the specified node is the last child in the parent element.

no setter, inherited

nodeName → String

The read-only nodeName property of Node returns the name of the current node as a string.

no setter, inherited

nodeType → int

The read-only nodeType property of a Node interface is an integer that identifies what the node is. It distinguishes different kind of nodes from each other, such as Element, Text and Comment.

no setter, inherited

nodeValue ↔ String?

The nodeValue property of the Node interface returns or sets the value of the current node.

getter/setter pair, inherited

not → JSBoolean

Available on JSAny?, provided by the JSAnyOperatorExtension extension

The result of !this in JavaScript.

no setter

ownerDocument → Document?

The read-only ownerDocument property of the Node interface returns the top-level document object of the node.

no setter, inherited

ownerElement → Element?

The read-only ownerElement property of the Attr interface returns the Element the attribute belongs to.

no setter

parentElement → Element?

The read-only parentElement property of Node interface returns the DOM node's parent Element, or null if the node either has no parent, or its parent isn't a DOM Element.

no setter, inherited

parentNode → Node?

The read-only parentNode property of the Node interface returns the parent of the specified node in the DOM tree.

no setter, inherited

prefix → String?

The read-only prefix property of the Attr returns the namespace prefix of the attribute, or null if no prefix is specified.

no setter

previousSibling → Node?

The read-only previousSibling property of the Node interface returns the node immediately preceding the specified one in its parent's Node.childNodes list, or null if the specified node is the first in that list.

no setter, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

specified → bool

The read-only specified property of the Attr interface always returns true.

no setter

text ← String

Available on Node, provided by the NodeGlue extension

no getter

textContent ↔ String?

The textContent property of the Node interface represents the text content of the node and its descendants.

getter/setter pair, inherited

value ↔ String

The value property of the Attr interface contains the value of the attribute.

getter/setter pair

Methods

add(JSAny? any) → JSAny

Available on JSAny?, provided by the JSAnyOperatorExtension extension

The result of this + any in JavaScript.

addEventListener(String type, EventListener? callback, [JSAny options]) → void

The addEventListener() method of the EventTarget interface sets up a function that will be called whenever the specified event is delivered to the target.

inherited

and(JSAny? any) → JSAny?

Available on JSAny?, provided by the JSAnyOperatorExtension extension

The result of this && any in JavaScript.

append(Node other) → Node

Available on Node, provided by the NodeGlue extension

appendChild(Node node) → Node

The appendChild() method of the Node interface adds a node to the end of the list of children of a specified parent node.

inherited

callMethod<R extends JSAny?>(JSAny method, [JSAny? arg1, JSAny? arg2, JSAny? arg3, JSAny? arg4]) → R

Available on JSObject, provided by the JSObjectUnsafeUtilExtension extension

Calls method on this JSObject with up to four arguments.

callMethodVarArgs<R extends JSAny?>(JSAny method, [List<JSAny?>? arguments]) → R

Available on JSObject, provided by the JSObjectUnsafeUtilExtension extension

Calls method on this JSObject with a variable number of arguments.

clone(bool? deep) → Node

Available on Node, provided by the NodeGlue extension

cloneNode([bool deep]) → Node

The cloneNode() method of the Node interface returns a duplicate of the node on which this method was called. Its parameter controls if the subtree contained in a node is also cloned or not.

inherited

compareDocumentPosition(Node other) → int

The compareDocumentPosition() method of the Node interface reports the position of its argument node relative to the node on which it is called.

inherited

contains(Node? other) → bool

The contains() method of the Node interface returns a boolean value indicating whether a node is a descendant of a given node, that is the node itself, one of its direct children (Node.childNodes), one of the children's direct children, and so on.

inherited

dartify() → Object?

Available on JSAny?, provided by the JSAnyUtilityExtension extension

Converts a JavaScript JSON-like value to the Dart equivalent if possible.

delete(JSAny property) → JSBoolean

Available on JSObject, provided by the JSObjectUnsafeUtilExtension extension

Deletes the property with key property from this JSObject.

dispatchEvent(Event event) → bool

The dispatchEvent() method of the EventTarget sends an Event to the object, (synchronously) invoking the affected event listeners in the appropriate order. The normal event processing rules (including the capturing and optional bubbling phase) also apply to events dispatched manually with dispatchEvent().

inherited

divide(JSAny? any) → JSAny

Available on JSAny?, provided by the JSAnyOperatorExtension extension

The result of this / any in JavaScript.

equals(JSAny? any) → JSBoolean

Available on JSAny?, provided by the JSAnyOperatorExtension extension

The result of this == any in JavaScript.

exponentiate(JSAny? any) → JSAny

Available on JSAny?, provided by the JSAnyOperatorExtension extension

The result of this ** any in JavaScript.

getProperty<R extends JSAny?>(JSAny property) → R

Available on JSObject, provided by the JSObjectUnsafeUtilExtension extension

The value of the property key property of this JSObject.

getRootNode([GetRootNodeOptions options]) → Node

The getRootNode() method of the Node interface returns the context object's root, which optionally includes the shadow root if it is available.

inherited

greaterThan(JSAny? any) → JSBoolean

Available on JSAny?, provided by the JSAnyOperatorExtension extension

The result of this > any in JavaScript.

greaterThanOrEqualTo(JSAny? any) → JSBoolean

Available on JSAny?, provided by the JSAnyOperatorExtension extension

The result of this >= any in JavaScript.

has(String property) → bool

Available on JSObject, provided by the JSObjectUnsafeUtilExtension extension

Shorthand helper for hasProperty to check whether this JSObject contains the property key property, but takes and returns a Dart value.

hasChildNodes() → bool

The hasChildNodes() method of the Node interface returns a boolean value indicating whether the given Node has child nodes or not.

inherited

hasProperty(JSAny property) → JSBoolean

Available on JSObject, provided by the JSObjectUnsafeUtilExtension extension

Whether or not this JSObject contains the property key property.

insertBefore(Node node, Node? child) → Node

The insertBefore() method of the Node interface inserts a node before a reference node as a child of a specified parent node.

inherited

instanceof(JSFunction constructor) → bool

Available on JSAny?, provided by the JSAnyUtilityExtension extension

Whether this JSAny? is an instanceof constructor.

instanceOfString(String constructorName) → bool

Available on JSAny?, provided by the JSAnyUtilityExtension extension

Whether this JSAny? is an instanceof the constructor that is defined by constructorName, which is looked up in the globalContext.

isA<T extends JSAny?>() → bool

Available on JSAny?, provided by the JSAnyUtilityExtension extension

Whether this JSAny? is an instance of the JavaScript type that is declared by T.

isDefaultNamespace(String? namespace) → bool

The isDefaultNamespace() method of the Node interface accepts a namespace URI as an argument. It returns a boolean value that is true if the namespace is the default namespace on the given node and false if not.

inherited

isEqualNode(Node? otherNode) → bool

The isEqualNode() method of the Node interface tests whether two nodes are equal. Two nodes are equal when they have the same type, defining characteristics (for elements, this would be their ID, number of children, and so forth), its attributes match, and so on. The specific set of data points that must match varies depending on the types of the nodes.

inherited

isSameNode(Node? otherNode) → bool

The isSameNode() method of the Node interface is a legacy alias the for the === strict equality operator. That is, it tests whether two nodes are the same (in other words, whether they reference the same object).

inherited

lessThan(JSAny? any) → JSBoolean

Available on JSAny?, provided by the JSAnyOperatorExtension extension

The result of this < any in JavaScript.

lessThanOrEqualTo(JSAny? any) → JSBoolean

Available on JSAny?, provided by the JSAnyOperatorExtension extension

The result of this <= any in JavaScript.

lookupNamespaceURI(String? prefix) → String?

The lookupNamespaceURI() method of the Node interface takes a prefix as parameter and returns the namespace URI associated with it on the given node if found (and null if not).

inherited

lookupPrefix(String? namespace) → String?

The lookupPrefix() method of the Node interface returns a string containing the prefix for a given namespace URI, if present, and null if not. When multiple prefixes are possible, the first prefix is returned.

inherited

modulo(JSAny? any) → JSAny

Available on JSAny?, provided by the JSAnyOperatorExtension extension

The result of this % any in JavaScript.

multiply(JSAny? any) → JSAny

Available on JSAny?, provided by the JSAnyOperatorExtension extension

The result of this * any in JavaScript.

normalize() → void

The normalize() method of the Node interface puts the specified node and all of its sub-tree into a normalized form. In a normalized sub-tree, no text nodes in the sub-tree are empty and there are no adjacent text nodes.

inherited

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

notEquals(JSAny? any) → JSBoolean

Available on JSAny?, provided by the JSAnyOperatorExtension extension

The result of this != any in JavaScript.

or(JSAny? any) → JSAny?

Available on JSAny?, provided by the JSAnyOperatorExtension extension

The result of this || any in JavaScript.

removeChild(Node child) → Node

The removeChild() method of the Node interface removes a child node from the DOM and returns the removed node.

inherited

removeEventListener(String type, EventListener? callback, [JSAny options]) → void

The removeEventListener() method of the EventTarget interface removes an event listener previously registered with EventTarget.addEventListener from the target. The event listener to be removed is identified using a combination of the event type, the event listener function itself, and various optional options that may affect the matching process; see Matching event listeners for removal.

inherited

replaceChild(Node node, Node child) → Node

The replaceChild() method of the Node interface replaces a child node within the given (parent) node.

inherited

setProperty(JSAny property, JSAny? value) → void

Available on JSObject, provided by the JSObjectUnsafeUtilExtension extension

Write the value of property key property of this JSObject.

strictEquals(JSAny? any) → JSBoolean

Available on JSAny?, provided by the JSAnyOperatorExtension extension

The result of this === any in JavaScript.

strictNotEquals(JSAny? any) → JSBoolean

Available on JSAny?, provided by the JSAnyOperatorExtension extension

The result of this !== any in JavaScript.

subtract(JSAny? any) → JSAny

Available on JSAny?, provided by the JSAnyOperatorExtension extension

The result of this - any in JavaScript.

toString() → String

A string representation of this object.

inherited

typeofEquals(String typeString) → bool

Available on JSAny?, provided by the JSAnyUtilityExtension extension

Whether the result of typeof on this JSAny? is typeString.

unsignedRightShift(JSAny? any) → JSNumber

Available on JSAny?, provided by the JSAnyOperatorExtension extension

The result of this >>> any in JavaScript.

Operators

operator ==(Object other) → bool

The equality operator.

inherited

operator [](String property) → JSAny?

Available on JSObject, provided by the JSObjectUnsafeUtilExtension extension

Shorthand helper for getProperty to get the value of the property key property of this JSObject, but takes a Dart value.

operator []=(String property, JSAny? value) → void

Available on JSObject, provided by the JSObjectUnsafeUtilExtension extension

Shorthand helper for setProperty to write the value of the property key property of this JSObject, but takes a Dart value.