To help you get started, we've collected the most common ways that @rooks/use-mutation-observer is being used within popular public projects.

elrumordelaluz / reactour / src / Tour.js View on Github

showButtons,
  showNavigation,
  prevButton,
  showNavigationNumber,
  disableDotsNavigation,
  lastStepNextButton,
  nextButton,
  rounded,
  maskSpace,
}) {
  const [current, setCurrent] = useState(0)
  const [state, dispatch] = useReducer(reducer, initialState)
  const helper = useRef(null)
  const observer = useRef(null)

  useMutationObserver(observer, (mutationList, observer) => {
    if (isOpen) {
      showStep()
      mutationList.forEach(mutation => {
        if (mutation.type === 'childList' && mutation.addedNodes.length > 0) {
          setTimeout(
            () => makeCalculations(getNodeRect(mutation.addedNodes[0])),
            500
          )
        } else if (
          mutation.type === 'childList' &&
          mutation.removedNodes.length > 0
        ) {
          // console.log('Removed node, do something')
        }
      })
    } else {

View more ways to use @rooks/use-mutation-observer

@rooks/use-mutation-observer

Note: Future updates to this package have moved to the main package rooks. All hooks now reside in a single package which you can install using

npm install rooks

or

yarn add rooks

Rooks is completely treeshakeable and if you use only 1 of the 50+ hooks in the package, only that hook will be bundled with your code. Your bundle will only contain the hooks that you need. Cheers!

About

Mutation Observer hook for React.

Installation

npm install --save @rooks/use-mutation-observer

Importing the hook

import useMutationObserver from "@rooks/use-mutation-observer"

Usage

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 (
    <>
      <div style="{{">
        <div style="{{">
          <p>
            Resize this div as you see fit. To demonstrate that it also updates
            on child dom nodes resize
          </p>
        </div>
        <h2>Bounds</h2>
        <p>
          <button> setXOffset(XOffset - 5)}&gt; Move Left </button>
          <button> setXOffset(XOffset + 5)}&gt; Move Right </button>
        </p>
        <p>
          <button> setYOffset(YOffset - 5)}&gt; Move Up </button>
          <button> setYOffset(YOffset + 5)}&gt; Move Down </button>
        </p>
      </div>
      <div style="{{">
        <pre>Mutation count {mutationCount}</pre>
      </div>
    
  );
}

render()

Arguments