Revision history [back]

1. Import the necessary packages: import { useRef, useEffect } from 'react'; import { IonContent } from '@ionic/react';
2. Create a reference to the IonContent element using useRef: const contentRef = useRef<HTMLIonContentElement>(null);
3. Add the overscroll-behavior CSS property to the IonContent element: <IonContent ref={contentRef} style={{ overscrollBehavior: 'contain' }}> ... </IonContent>

4. Use useEffect hook to add the overscroll effect after the component has mounted:

   useEffect(() => {
    const contentElement = contentRef.current;
    if (contentElement) {
      contentElement.addEventListener('touchmove', handleTouchMove, { passive: false });
    }
    return () => {
      if (contentElement) {
        contentElement.removeEventListener('touchmove', handleTouchMove);
      }
    };
   }, []);
   
   const handleTouchMove = (event: TouchEvent) => {
    const contentElement = contentRef.current;
    if (contentElement) {
      const scrollTop = contentElement.scrollTop;
      const scrollHeight = contentElement.scrollHeight;
      const height = contentElement.clientHeight;
      const delta = event.touches[0].clientY - startY;
      const offset = contentElement.offsetHeight - contentElement.scrollHeight;
      if (scrollTop === 0 && delta > 0) {
        event.preventDefault();
        contentElement.style.transform = `translate3d(0, ${delta}px, 0)`;
      } else if (scrollTop === scrollHeight - height && delta < 0) {
        event.preventDefault();
        contentElement.style.transform = `translate3d(0, ${delta}px, 0)`;
      }
      if (contentElement.style.transform !== '' && Math.abs(delta) > 50) {
        contentElement.style.transition = 'transform 0.3s ease-out';
     }
    }
   };
   

   This code assumes that you have defined startY somewhere.

Note: The overscroll effect can negatively impact performance on some devices, so use it sparingly and test on multiple devices before implementing it in production.