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Version: 5.6.1



Mutation Observer hook for React.


npm install --save rooks

Importing the hook​

import { useMutationObserver } from "rooks";


function Demo() {
const myRef = useRef();
const [mutationCount, setMutationCount] = useState(0);
const incrementMutationCount = () => {
return setMutationCount(mutationCount + 1);
useMutationObserver(myRef, incrementMutationCount);
const [XOffset, setXOffset] = useState(0);
const [YOffset, setYOffset] = useState(300);
return (
width: 300,
background: "lightblue",
padding: "10px",
position: "absolute",
left: XOffset,
top: YOffset,
resize: "both",
overflow: "auto",
background: "white",
color: "blue",
maxWidth: "100%",
Resize this div as you see fit. To demonstrate that it also updates
on child dom nodes resize
<button onClick={() => setXOffset(XOffset - 5)}> Move Left </button>
<button onClick={() => setXOffset(XOffset + 5)}> Move Right </button>
<button onClick={() => setYOffset(YOffset - 5)}> Move Up </button>
<button onClick={() => setYOffset(YOffset + 5)}> Move Down </button>
<div style={{ height: 500 }} onClick={incrementMutationCount}>
<pre>Mutation count {mutationCount}</pre>

render(<Demo />);


ArgumentTypeDescriptionDefault value
refReact refRef which should be observed for Mutationsundefined
callbackfunctionFunction which should be invoked on mutation. It is called with the mutationList and observerundefined
configobjectMutation Observer configuration{attributes: true,,characterData: true,,subtree: true,,childList: true}

Codesandbox Example​

Basic usage​

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You can click on the floating discord icon at the bottom right of the screen and talk to us in our server.