import React, { useEffect } from 'react'; function ScrollComponent() { const handleScroll = (event) => { console.log('Scrolling:', event.target.scrollTop); }; return ( {/* 内容 */} ); } export default ScrollComponent; 使用addEventListener 代码语言:txt 复制 import React, { useEffect...
import React, { useEffect } from 'react'; function MyComponent() { useEffect(() => { function handleKeyDown(event) { if (event.key === 'Enter') { console.log('Enter key pressed!'); } } window.addEventListener('keydown', handleKeyDown); return () => { window.removeEventListener(...
一般我们直接导入的react,也可以从react中结构出自己用的属性或方法进行使用: import React from "react"; class CityList extends React.Component { constructor(props) { super(props); this.state = { cityList: {}, cityIndex: [], activeIndex: 0, }; // 创建ref对象 this.cityListComponent = React...
Notice we can pass theingredientClickfunction as we would pass any other prop to a component. Update IngredientList to use event listener In React, properties (orprops) can be any JavaScript type, including functions. So we can set up an event handler as a prop. This setup allows us to ...
在一个component里面加上对返回键的监听,但是如果有一个新的screen push过来,返回键的监听依旧存在,所以需要在页面切换的时候,对监听进行注销与重新注册。 classMyComponent extends React.Component{constructor(props){super(props);this.didFocusSubscription=props.navigation.addListener('didFocus',()=>{BackHandler.a...
reactContext.addActivityEventListener(this); } 开发者ID:contoriel,项目名称:react-native-cafe-bazaar,代码行数:8,代码来源:CafeBazaar.java importcom.facebook.react.bridge.ReactApplicationContext;//导入方法依赖的package包/类publicRNMessageComposeModule(finalReactApplicationContext reactContext)...
import React, {Component, PropTypes} from 'react'; import pure from 'recompose/pure'; import Immutable from 'immutable'; import AppBar from 'material-ui-build/src/AppBar'; import DocumentTitle from 'react-document-title'; import {createStyleSheet} from 'stylishly/lib/styleSheet'; import polyglo...
export class ErrorBoundary extends React.Component<Props, State> { constructor(props: Props) { super(props); this.state = { hasError: false }; } static getDerivedStateFromError() { return { hasError: true }; } componentDidCatch(error: any, info: any) { console.error(error, info); }...
public TwilioVoiceModule(ReactApplicationContext reactContext, boolean shouldAskForMicPermission) { super(reactContext); if (BuildConfig.DEBUG) { Voice.setLogLevel(LogLevel.DEBUG); } else { Voice.setLogLevel(LogLevel.ERROR); } reactContext.addActivityEventListener(this); reactContext...
You can implement infinite scroll in React in a few different ways. The first is to use a library like react-infinite-scroll-component. This library’s component triggers an event whenever the user scrolls to the bottom of the page. You can then use this event as a cue to load more co...