useMeasure

The useMeasure hook is a React hook that is used to measure the dimensions and position of an HTML element. It uses the ResizeObserver API to detect changes in the size of the element and returns a Measure object that contains the measurements of the element. This hook is useful for implementing responsive designs or for any scenario where you need to know the dimensions of an element in your application.

Installation

To use useMeasure, you need to install it as a dependency in your React project. You can do this via npm or yarn.

npm install microhook

yarn add microhook

Usage

To use the useMeasure hook, import it into your React component and pass it an element argument. The element argument can be either a string that represents a CSS selector or a React RefObject that references the element you want to measure.

import { useMeasure } from 'microhook';

const ExampleComponent = () => {
  const [measure, actions] = useMeasure('#my-element');

  return (
    <div>
      <h1>Element measurements:</h1>
      <ul>
        <li>Width: {measure.width}px</li>
        <li>Height: {measure.height}px</li>
        <li>Top: {measure.top}px</li>
        <li>Right: {measure.right}px</li>
        <li>Bottom: {measure.bottom}px</li>
        <li>Left: {measure.left}px</li>
        <li>X: {measure.x}px</li>
        <li>Y: {measure.y}px</li>
      </ul>
      <div id="my-element">Hello world!</div>
    </div>
  );
};

In this example, the useMeasure hook is passed a CSS selector '#my-element', which targets the <div> element with an id of my-element. The measure object returned by the hook contains the dimensions and position of the element. The actions object is empty, since this hook doesn't perform any actions.

Conclusion

The useMeasure hook is a useful tool for measuring the dimensions and position of an HTML element in your React application. It is easy to use and provides a convenient way to implement responsive designs or to gather information about an element in your application.