我基于变量加载呈现两个Chakra UI组件:
{loading ? (<Spinner>) : (<Text color={useColorModeValue('gray.800', 'gray.400')>Hi</Text) }
但是IDE警告我这一点:ESLint: React Hook "useColorModeValue" is called conditionally. React Hooks must be called in the exact same order in every componen
当我单击每个post项目时,详细信息不会显示在浏览器上(用于显示每个post项细节的post.js组件)。浏览器上唯一显示的东西是白页!这些是我的组成部分:
谢谢你的帮助。
这是我的App.js组件:
import { BrowserRouter, Routes, Route } from "react-router-dom";
import Home from "./components/Home";
import About from "./components/About";
import Contact from "./compo
我使用map方法呈现了所有的想象,我想要做的是跟踪当前的图像索引,这样我就可以更改位于另一个div中的项描述,或者您可以为我提供另一个解决方案。
App.js:
import Carousel from 'react-bootstrap/Carousel';
import './style.css'
import Container from 'react-bootstrap/Container';
import Row from 'react-bootstrap/Row';
import Col from 'react-
本质上,我得到了一个不变的违规错误:
React.createElement: type is invalid -- expected a string (for built-in components) or a class/function (for composite components) but got: undefined. You likely forgot to export your component from the file it's defined in, or you might have mixed up default and named imports
当我使用propTypes和条件渲染子对象时,我遇到一个错误。
错误:Warning: Failed prop type: The prop 'rate' is marked as required in 'Rate', but its value is 'undefined'
// index.js
import React, { Component } from "react";
import { render } from "react-dom";
import Rate from "./compon
我正在使用React和Redux为下拉菜单构建一个动态子菜单。计划是,当用户单击下拉菜单时,将进行API调用,并根据API的响应创建一个子菜单。这是我的下拉菜单文件
MainMenu.js
import React, {useEffect} from 'react'
import CreateSubMenu from './utils/CreateSubMenu.js'
import fetchSubMenuData from './actions/submenuAction.js'
function getSubMenu(menu, leve
我使用的是最新版本的create-react-app、mobx-react、material-ui和react-router。当我尝试使用Redirect组件重定向到其他组件时,它不起作用。然后我遵循这个answer,问题仍然存在。 我的代码: //App.js
// other imports
import { withStyles } from '@material-ui/core/styles';
import Cart from "./stores/Cart";
const cart_counter = new Cart();
class Ap