@nekogd/react-utility-hooks v1.2.9

React Utility Hooks

Modular utility hooks that we often use grouped in one package.\ Written in TypeScript, documented (NPM and JSDoc), unit tested (not all of them atm) and maintained.\ Disclaimer: at least React 16 is needed (that's the one with hooks)).:)

The example usages are in JavaScript.

For TS users, please refer to API or JSDoc of a given hook, you have all the necessary information about types.

Live demo (React app that makes use of the package)

CodeSandbox: https://codesandbox.io/s/github/nekogd/react-utility-hooks-examples-sandbox

GitHub: https://github.com/nekogd/react-utility-hooks-examples-sandbox

useWhyRerender

Happy debugging!\ The hook to inspect why the component has rerendered (we've all been (or will be) there).\ If we have changes in component props, we will have them logged into js console.\ This helps us a lot in debugging.

Example usage

import { useWhyRerender } from '@nekogd/react-utility-hooks';

const ExampleComponent = React.memo((props) => {
  const { count, style } = props;
  useWhyRerender('example component name', props);

  return <div style={style}>{count}</div>;
});

Check your JS console, it will be empty if props has not changed, or will show you the changes.

API

type IUseWhyRerender = {
  [key: string]: any;
};

function useWhyRerender(componentName: string, props: IUseWhyRerender): void;

useEventListener

If we find ourselves adding eventListeners with useEffect a lot, it might be a good idea to abstract that to a custom hook.

More info: https://developer.mozilla.org/en-US/docs/Web/API/EventTarget/addEventListener

Example usage

import { useEventListener } from '@nekogd/react-utility-hooks';

const ExampleComponent = () => {
  // Initial state to track down mouse position
  const [coords, setCoords] = useState({ x: 0, y: 0 });

  // Make sure the reference don't change
  const handler = useCallback(
    ({ clientX, clientY }) => {
      setCoords({ x: clientX, y: clientY });
    },
    [setCoords],
  );

  // Add event listener using our hook
  useEventListener('mousemove', handler);

  return (
    <>
      <h2>client mouse coords</h2>
      <table>
        <tbody>
          <tr>
            <td>clientX</td>
            <td>{coords.x}</td>
          </tr>
          <tr>
            <td>clientY</td>
            <td>{coords.y}</td>
          </tr>
        </tbody>
      </table>
    </>
  );
};

Api

type Target =
  | (() => HTMLElement)
  | HTMLElement
  | React.MutableRefObject<HTMLElement>
  | Window;

function useEventListener(
  eventName: string,
  handler: Function,
  options?: { target: Target; capture?: boolean; once?: boolean; passive?: boolean },
): void;

useClickAway

A hook that manages click outside of target elements.

Example usage

  import { useClickAway } from "@nekogd/react-utility-hooks";

  const ExampleComponent = () => {
    const [counter, setCounter] = useState(0);
    const ref = useRef();
    
    // with TypeScript we might have to say const ref = useRef() as React.MutableRefObject<HTMLElement>; 
    
    useClickAway(() => {
      setCounter((s) => s + 1);
    }, ref);

    return (
      <>
        <div>
          Click anywhere outside the span to increse the counter
          <span ref={ref}>
            <button type="button">This does not increase the counter</button>
          </span>
          <p>counter: {counter}</p>
        </div>
      </>
    );
  }

API

function useClickAway(
  onClickAway: (event: MouseEvent | TouchEvent) => void,
  target: (() => HTMLElement) | HTMLElement | React.MutableRefObject,
);

Params

useHover

Inspect if component is hovered.

Example usage

import { useHover } from '@nekogd/react-utility-hooks';

const ExampleComponent = () => {
  const [hoverRef, isHovered] = useHover();

  return <div ref={hoverRef}> {isHovered ? 'I am hovered' : 'Not hovered'}</div>;
};

API

function useHover(<T extends HTMLElement>(): [
  (node?: T | null) => void,
  boolean,
])

useDocumentTitle

Change document title without React Helmet. :)

Example usage

import { useDocumentTitle } from '@nekogd/react-utility-hooks';

const ExampleComponent = () => {
  useDocumentTitle(`my new Document Title`);

  return <> Content of my component </>;
};

API

function useDocumentTitle(title: string): void;

useSlug

Generate slug from input string.

Example usage

import { useSlug } from '@nekogd/react-utility-hooks';

const ExampleComponent = () => {
  const slug = useSlug('Some string');

  return <> The slug is {slug} </>;
};

API

function useSlug(input: string): string | null;

UseToggle

Just to toggle i.e. accordions. Accepts initial boolean value.

example usage

const ExampleComponent = () => {
  const { toggled, handleToggled } = useToggle();

  const handleClick = () => {
    handleToggled();
  };

  return (
    <>
      <button onClick={handleClick}>toggle</button>
      {toggled ? 'visible' : 'hidden'}
    </>
  );
};

API

type IUseToggle = { toggled: boolean; handleToggled: (value?: boolean) => void };

function useToggle(initialState: boolean = false): IUseToggle;

useCounter

Groundbreaking useCounter example to give understanding of the flow of this package i.e. types and tests.

Example usage

import { useCounter } from "@nekogd/react-utility-hooks";

const ExampleComponent = () => {
  const { count, increment, reset, decrement } = useCounter();
  return (
    <>
      <button onClick={increment}>Increment counter</button>
      <button onClick={reset}>Reset counter</button>
      <button onClick={decrement}>Decrement counter</button>
      <p>{count}</p>
    </>
  );
};

API

type IUseCounter = {
  count: number;
  increment: () => void;
  reset: () => void;
  decrement: () => void;
};

function useCounter(initialValue: number = 0): IUseCounter;