I have a code snippet that manages pointer events:
container.on('pointerdown pointerup pointercancel pointerout pointerleave', console.log);
While this code functions correctly on my computer, it behaves differently on mobile. Upon touching the screen, it triggers pointerdown as expected. However, when I move my finger, it quickly triggers pointercancel, pointerout, and pointerleave. Furthermore, lifting my finger does not trigger pointerup.
One reason for browser interference with gestures is to facilitate page scrolling and updates. To counteract this, you can include touch-action: none; in your CSS for the current element before any pointer events occur.
Alternatively, utilizing touch events (instead of pointer events) with passive: false and event.preventDefault() immediately (outside of a promise) can prevent browsers from intercepting gestures after a pointer event occurs. Ensure that this listener is added first in order to take precedence over other event listeners.
const onTouchMove = (ev:TouchEvent)=>{
ev.preventDefault()
}
element.addEventListener(
'touchmove',
onTouchMove,
{ passive: false }
)
Despite these methods, there may still be issues with the pointerleave event not functioning correctly when moving a finger outside of an element compared to using a mouse.
To address this issue and enable functions such as pointerleave, adjustments can be made within the pointerdown event:
const onPointerDown = function (ev) {
ev.target.releasePointerCapture(ev.pointerId)
}
element.addEventListener(
'pointerdown',
onPointerDown
)
Additionally, CSS offers useful properties like user-select: none; (which prevents selection and is inherited) and pointer-events: none; (which renders an element transparent to pointer events and is also inherited).
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