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What is the process for activating the Overscroll effect in Android using Ionic 6 and React?

asked 2023-07-18 00:54:56 +0000

huitzilopochtli gravatar image

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answered 2023-07-18 01:18:02 +0000

scrum gravatar image
  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.

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Asked: 2023-07-18 00:54:56 +0000

Seen: 8 times

Last updated: Jul 18 '23