How to Capture Scroll Events on iPhone/iPad: Why It\'s Different and How to Do It Right

Troubleshooting Scroll Event Capture on iPhone/iPad

Capturing scroll events on iOS devices can be challenging compared to desktop browsers. This article addresses the issue, explaining the unique behavior of scrolling on iOS and providing solutions for event handling.

iOS Scroll Event Behavior

Unlike web browsers on PCs, iPhone and iPad devices capture scroll events differently. One-finger panning and two-finger scrolling only trigger scroll events after the user stops the motion, when the page redraws. This behavior contrasts with the immediate event triggering on desktop browsers.

Event Handler Installation

Despite the unique event behavior, common methods for attaching scroll event handlers still work on iOS devices:

• window.addEventListener('scroll', ...)
• $(window).scroll(...)
• window.onscroll = ...

Example:

<code class="javascript">window.addEventListener('scroll', function() {
  console.log('Scrolled');
});</code>

Additional Information

For further reference, you can consult Apple's developer documentation on [Handling Events in Safari Web Content](https://developer.apple.com/library/content/documentation/AppleApplications/Reference/SafariWebContent/HandlingEvents/HandlingEvents.html).

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