Creating AccordionItem

Second, create an AccordionItem component with the useAccordionItem and useAccordionItemEffect hook exported from the library.

Without height transition

Use the following code if you don't need the height transition for expanding and collapsing items.

import React from 'react';
import {
  useAccordionItem,
  useAccordionItemEffect
} from '@szhsin/react-accordion';
import ChevronDown from '@site/static/img/chevron-down.svg';
import styles from '../accordion/styles.module.css';

const AccordionItem = ({
  header,
  children,
  itemKey,
  initialEntered,
  disabled
}: {
  header: React.ReactNode;
  children: React.ReactNode;
  itemKey?: string | number;
  initialEntered?: boolean;
  disabled?: boolean;
}) => {
  const { itemRef, state, toggle } =
    useAccordionItemEffect<HTMLDivElement>({
      itemKey,
      initialEntered,
      disabled
    });
  const { buttonProps, panelProps } = useAccordionItem({
    state,
    toggle,
    disabled
  });
  const { status, isMounted, isEnter } = state;

  return (
    <div className={styles.item} ref={itemRef}>
      {/* Choose a heading level that is appropriate for the information 
      architecture of your page */}
      <h3 style={{ margin: 0 }}>
        <button
          className={isEnter ? styles.buttonExpanded : styles.button}
          type="button"
          {...buttonProps}
        >
          {header}
          <ChevronDown className={styles.chevron} />
        </button>
      </h3>
      {isMounted && (
        <div
          className={styles.panel}
          style={{
            display: status === 'exited' ? 'none' : undefined
          }}
          {...panelProps}
        >
          {children}
        </div>
      )}
    </div>
  );
};

export default AccordionItem;

Height transition

Use the useHeightTransition hook and add a wrapping div around the accordion item children if you want the height transition for expanding and collapsing items.

import React from 'react';
import {
  useAccordionItem,
  useAccordionItemEffect,
  useHeightTransition
} from '@szhsin/react-accordion';
import ChevronDown from '@site/static/img/chevron-down.svg';
import styles from '../accordion/styles.module.css';

const AccordionItem = ({
  header,
  children,
  itemKey,
  initialEntered,
  disabled
}: {
  header: React.ReactNode;
  children: React.ReactNode;
  itemKey?: string | number;
  initialEntered?: boolean;
  disabled?: boolean;
}) => {
  const { itemRef, state, toggle } =
    useAccordionItemEffect<HTMLDivElement>({
      itemKey,
      initialEntered,
      disabled
    });
  const { buttonProps, panelProps } = useAccordionItem({
    state,
    toggle,
    disabled
  });

  const [transitionStyle, panelRef] =
    useHeightTransition<HTMLDivElement>(state);

  const { status, isMounted, isEnter } = state;

  return (
    <div className={styles.item} ref={itemRef}>
      <h3 style={{ margin: 0 }}>
        <button
          className={isEnter ? styles.buttonExpanded : styles.button}
          type="button"
          {...buttonProps}
        >
          {header}
          <ChevronDown className={styles.chevron} />
        </button>
      </h3>
      {isMounted && (
        // Add an extra `div` around the panel `div` for the
        // height transition to work as intended
        <div
          className={styles.content}
          style={{
            display: status === 'exited' ? 'none' : undefined,
            ...transitionStyle
          }}
        >
          <div
            className={styles.panel}
            ref={panelRef}
            {...panelProps}
          >
            {children}
          </div>
          {/* Closing tag of the extra `div` */}
        </div>
      )}
    </div>
  );
};

export default AccordionItem;