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unexpected scroll on init | incorrect onScroll behavior |infinity scroll loop

Asked by senioro
5 months ago.

I took an example - https://javascript.daypilot.org/demo/scheduler/infinite.html and just modify the onScroll function:

onScroll(args) {
const { viewport } = args;

this.props.loadItemsRequest(viewport.start, viewport.end);
// I load data and save it to the redux store and I provide "events" prop to the Scheduler
// After events prop change I have unexpected scroll
},

P.S. onScroll is called not only after scroll, onScroll is called after init, props update and scroll.

I can't fetch data into onScroll method, that's is not a good idea and I have to store it to the state and process into a selector (redux staff)

I'm using https://npm.daypilot.org/daypilot-pro-react/trial/2020.2.4481.tar.gz

Answer posted by Dan Letecky [DayPilot]
5 months ago.

You must not assign the events attribute in onScroll. This causes the change detection mechanism to refresh the Scheduler and fire another onScroll event.

See also a related question (it's for Angular but the logic applies here as well):
https://forums.daypilot.org/question/5127/onscroll-infinite-loop

The onScroll event is not the native onscroll event and the behavior is different, by design. Its purpose is to provide an event that will supply event data during scrolling. That's why it's called after init and after every update.

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