MutationEvent: prevValue property
Deprecated: This feature is no longer recommended. Though some browsers might still support it, it may have already been removed from the relevant web standards, may be in the process of being dropped, or may only be kept for compatibility purposes. Avoid using it, and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.
The prevValue
read-only property of the MutationEvent
interface returns a string. In DOMAttrModified
events, it represents the previous value of the Attr
node. In DOMCharacterDataModified
events, it contains the previous value of the CharacterData
node. In all other cases, returns the empty string (""
).
Value
A string.
Examples
js
element.addEventListener(
"DOMAttrModified",
(event) => {
console.log(event.previousValue);
},
false
);
Specifications
Specification |
---|
UI Events # dom-mutationevent-prevvalue |
Browser compatibility
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