I have built a component in React which is supposed to update its own style on window scroll to create a parallax effect.
The component render
method looks like this:
function() {
let style = { transform: 'translateY(0px)' };
window.addEventListener('scroll', (event) => {
let scrollTop = event.srcElement.body.scrollTop,
itemTranslate = Math.min(0, scrollTop/3 - 60);
style.transform = 'translateY(' + itemTranslate + 'px)');
});
return (
<div style={style}></div>
);
}
This doesn’t work because React doesn’t know that the component has changed, and therefore the component is not rerendered.
I’ve tried storing the value of itemTranslate
in the state of the component, and calling setState
in the scroll callback. However, this makes scrolling unusable as this is terribly slow.
Any suggestion on how to do this?