听向上/向下滚动? [英] Listen for scroll up / down?

问题描述

我正在构建一个应用程序 (ES6)，我很好奇捕获向上/向下滚动事件的正确"方法是什么?

I'm building an app (ES6) and I'm curious what is the 'correct' way to catch scroll up / down events?

我尝试 (npm) 安装 react-scroll-listener，但我无法让它与我的 ES6 类一起工作.

I tried (npm) installing react-scroll-listener but I couldn't get it to work with my ES6 class.

基本上我想要:如果向上滚动，请执行此操作；如果向下滚动，请执行其他操作.

Basically I want: if scroll up, do this; if scroll down, do something else.

import React from 'react';
import config from '../config';
import StaticImageList from '../Common/StaticImageList';
import ScrollListener from 'react-scroll-listener';

class Album extends React.Component {
    constructor(props){
      super(props);

    }
    myScrollStartHandler(){
        console.log('Scroll start');

    }
    myScrollEndHandler(){
        console.log('Scroll end 300ms(default)');
    }
    componentDidMount(){
      scrollListener.addScrollHandler('body', myScrollStartHandler, myScrollEndHandler );
    }
    render(){
      return <StaticImageList />;
    }
};

export default Album; 

推荐答案

这是挂钩任何听众的一般建议:

This is general advice for hooking into any listeners:

在componentDidMount中附加东西，在componentWillUnmount

class Whatever extends Component {
  componentDidMount() {
    window.addEventListener('scroll', this.handleScroll, { passive: true })
  }

  componentWillUnmount() {
    window.removeEventListener('scroll', this.handleScroll)
  }

  handleScroll(event) {
    // do something like call `this.setState`
    // access window.scrollY etc
  }
}

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