每次使用useEffect函数触发useScrollToTop时,我都试图滚动到屏幕的顶部。但是,当我试图在useEffect中使用该函数时,会出现以下错误:
Error: Invalid hook call. Hooks can only be called inside of the body of a function component. This could happen for one of the following reasons:
1. You might have mismatching versions of React and the renderer (such as
我试图用useLayoutEffect创建一个组件,但当我添加ref.current?.onselect()时,它会给我以下错误: Cannot invoke an object which is possibly 'null'.ts(2721)
Expected 1 arguments, but got 0.ts(2554)
lib.dom.d.ts(6026, 44): An argument for 'ev' was not provided. 下面是我的代码: import * as React from 'react'
import
我想用钩子在POST请求成功后重新加载页面(再次调用get请求)。假设我有一个后减速机
const post = {
isLoading: false
isSaving: false
data: any
error: string
}
通常,当我创建类组件时
componentDidMount() {
this.props.getPost()
}
componentDidUpdate(prevProps) {
// When create new Post successfully, get post again
if (prevProps.pos
我正在尝试实现包装器标记,它绑定到子DOM元素上的事件,然后根据它们做一些事情。
我有以下代码:
const Wrapper: React.FC = (props) => {
// How do I get access to child div DOM element here??
someComponent.eventListenerOn(childDOMElement);
return <>{props.children}</>;
};
const ChildStuff: React.FC = () => {
ret
我正在使用redux工具箱方法中的api获取数据。我正在控制台中获取数据,但是我的钩子在页面加载时没有更新。
在这里输入代码
import { widthPercentageToDP as wp, heightPercentageToDP as hp } from 'react-native-responsive-screen';
import { useNavigation } from '@react-navigation/native';
import { Calendar } from 'react-native-calendars';
我如何才能解决这个问题,我正面临着一个错误: Nothing was returned from render. This usually means a return statement is missing. Or, to render nothing, return null. 当我想在我的列表屏幕(CurrenciesList.js)中显示我的JSON文件时,代码在这里 import React from 'react'
import { FlatList, View } from 'react-native'
import RowItem from
我在HomeScreen中使用Flatlist,它显示了多个帖子。所以现在我想要的是,每当我从应用程序注销或关闭应用程序,然后打开应用程序,我应该能够看到来自Flatlist的第一个项目。
我曾尝试在我的呈现函数中使用scrollToIndex,但它给了我一个错误- undefined is not an object (evaluating '_this2.refs.flatListRef.scrollToIndex')
<FlatList
data={this.state.data}
ref={(ref) => { this.flatListR