scrollListener
Do everything you want on scroll event. Such as lazy load , upload data.
Installation
npm install --save @1eeing/scroll-listenerUsage
// js
import { createListener } from '@1eeing/scroll-listener';
// When domContentLoaded has triggered.
const listener = createListener({
positions: ['main'],
actions: [
() => {
console.log('The element which id is main has scrolled to top of the screen.')
}
]
})
listener.start();
// When dom is removed
listener.stop();<!-- html -->
<body>
<div id='main'></div>
</body>If you are using React, you can use like this.
import React, { useEffect } from 'react';
import { createListener } from '@1eeing/scroll-listener';
const App = () => {
useEffect(() => {
const listener = createListener({
positions: ['main'],
actions: [
() => {
console.log('The element which id is main has scrolled to top of the screen.')
}
]
})
listener.start();
return () => listener.stop();
}, [])
return (
<div>
<div id='main'>
Hello world.
</div>
</div>
)
}
export default App;Options
positions
type: string[]
The id of the element you want to listen.
actions
type: ((id: string, offsetTop: number) => void)[]
The action of the element you want to listen. Triggerd when the element scrolls to the top of the screen by default. One-to-one correspondence with postions.
when target is passed in, the action will be triggerd when the element scrolls to the top of the target.
triggerType?
type: 'appeard' | 'appearing' | 'once'
Control when to trigger action. Default is once.
delayType?
type: 'throttle' | 'debounce'
Delay your action function. Default is undefined.
delay?
type: number
Only worked when delayType is passed in. Default is 500 ms.
offset?
type: number
Offset from the top of the screen or target.
target?
type: string
The target element'id you want to listen. Default the target is window.
needRequestIdleCallback?
type: boolean
Use requestIdleCallback to trigger action. See detail https://developer.mozilla.org/zh-CN/docs/Web/API/Window/requestIdleCallback[https://developer.mozilla.org/zh-CN/docs/Web/API/Window/requestIdleCallback]. Default is false.