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MutationRecord

A MutationRecord represents an individual DOM mutation. It is the object that is passed to MutationObserver's callback.

interface MutationRecord {

readonly addedNodes: NodeList;

readonly attributeName: string | null;

readonly attributeNamespace: string | null;

readonly nextSibling: Node | null;

readonly oldValue: string | null;

readonly previousSibling: Node | null;

readonly removedNodes: NodeList;

readonly target: Node;

readonly type: MutationRecordType;

}

var MutationRecord: {

prototype: MutationRecord;

new (): MutationRecord;

};

§Properties

readonly addedNodes: NodeList

Return the nodes added and removed respectively.

readonly attributeName: string | null

Returns the local name of the changed attribute, and null otherwise.

readonly attributeNamespace: string | null

Returns the namespace of the changed attribute, and null otherwise.

readonly nextSibling: Node | null

Return the previous and next sibling respectively of the added or removed nodes, and null otherwise.

readonly oldValue: string | null

The return value depends on type. For "attributes", it is the value of the changed attribute before the change. For "characterData", it is the data of the changed node before the change. For "childList", it is null.

readonly previousSibling: Node | null

Return the previous and next sibling respectively of the added or removed nodes, and null otherwise.

readonly removedNodes: NodeList

Return the nodes added and removed respectively.

readonly target: Node

Returns the node the mutation affected, depending on the type. For "attributes", it is the element whose attribute changed. For "characterData", it is the CharacterData node. For "childList", it is the node whose children changed.

readonly type: MutationRecordType

Returns "attributes" if it was an attribute mutation. "characterData" if it was a mutation to a CharacterData node. And "childList" if it was a mutation to the tree of nodes.