jsx

key is not available as prop in the Child component in ReactJs

纵饮孤独 提交于 2019-12-01 06:19:17
问题 I have a parent component in which below component is producing dynamically in map function as below: const renderListing = this.props.listing.map(function(list, index) { return ( <Listing key={index} title={list.title} totalWorkers={list.totalWorkers} /> ); }, this); In this <Listing /> component, I have a Checkbox from react-md as below: import { Checkbox } from "react-md"; class Listing extends React.Component { render() { return ( <Checkbox id="`listSector-${this.props.key}`" name="list

“Each child in an array should have a unique key prop” only on first time render of page

人走茶凉 提交于 2019-12-01 05:29:31
问题 I have a <tr> with a bunch of <td> inside that consists of all users logged in through Instagram. The <tr> is provided a unique key and when I first load the page, I am warned of each child not having a unique key prop. However, when I navigate away from that page OR when I delete the account/re-sign in through Instagram to list the account in the table, the warning doesn't come up anymore. Why does this happen? I'm 99% certain that the key is also unique because I console logged it to check

React Router: Cannot read property 'pathname' of undefined

♀尐吖头ヾ 提交于 2019-12-01 02:15:06
I've just started learning React and got stuck at this error. Uncaught TypeError: Cannot read property 'pathname' of undefined at new Router Here is my code: var React = require('react'); var ReactDOM = require('react-dom'); var { Route, Router, IndexRoute } = require('react-router'); var hashHistory = require('react-router-redux') var Main = require('./components/Main'); ReactDOM.render( <Router history={hashHistory}> <Route path="/" component={Main}> </Route> </Router>, document.getElementById('app') ); The tutorial I was following uses React-Router 2.0.0, but on my desktop I'm using 4.1.1.

React JSX

混江龙づ霸主 提交于 2019-11-30 23:06:07
React JSX React 使用 JSX 来替代常规的 JavaScript。 JSX 是一个看起来很像 XML 的 JavaScript 语法扩展。 我们不需要一定使用 JSX,但它有以下优点: JSX 执行更快,因为它在编译为 JavaScript 代码后进行了优化。 它是类型安全的,在编译过程中就能发现错误。 使用 JSX 编写模板更加简单快速。 const element = <h1>Hello, world!</h1>; 这种看起来可能有些奇怪的标签语法既不是字符串也不是 HTML。 它被称为 JSX, 一种 JavaScript 的语法扩展。 我们推荐在 React 中使用 JSX 来描述用户界面。 JSX 是在 JavaScript 内部实现的。 元素是构成 React 应用的最小单位,JSX 就是用来声明 React 当中的元素。 与浏览器的 DOM 元素不同,React 当中的元素事实上是普通的对象,React DOM 可以确保 浏览器 DOM 的数据内容与 React 元素保持一致。 要将 React 元素渲染到根 DOM 节点中,我们通过把它们都传递给 ReactDOM.render() 的方法来将其渲染到页面上: var myDivElement = <div className="foo" />; ReactDOM.render

React-router 2.0 browserHistory doesn't work when refreshing

你离开我真会死。 提交于 2019-11-30 20:32:26
Below codes report 404 not found when refreshing on page http://localhost/about . But if browserHistory is changed to hashHistory, it works fine. Here are my js file. import React, {Component} from 'react'; import ReactDOM from 'react-dom'; import { Router, Route, IndexRoute, Link, IndexLink, browserHistory, hashHistory } from 'react-router'; import $ from 'jquery'; class App extends Component { render() { return ( <div> <h1>APP!</h1> <Link to="/about">/about</Link> {this.props.children} </div> ) } } class About extends React.Component { render() { return ( <div> <h2>About 33</h2> </div> ) } }

jQuery fullCalendar displayed undefined on title

孤人 提交于 2019-11-30 17:53:46
i'm using jQuery fullcalendar on a ReactJs component. i have a <div id="calendar"></div> on the render method and on componentDidUpdate , i updated the calendar with the following codes: $('#calendar').fullCalendar({ header: { left: 'prev,next today', center: 'title', right: 'month,agendaWeek,agendaDay' }, events: _this.state.events, defaultView:'month', displayEventTime: false, editable: false, droppable: false, durationEditable: false }); and it shows "undefined" character on title. where did i go wrong? and how to debug where the undefined string came from? currently, i made a hacked

Calling a javascript function in JSX: why does calling a function without the () work?

余生长醉 提交于 2019-11-30 16:06:33
问题 Currently on Codecademy and learning about React. Came to this code: import React from 'react'; import ReactDOM from 'react-dom'; function makeDoggy(e) { // Call this extremely useful function on an <img>. // The <img> will become a picture of a doggy. e.target.setAttribute('src', 'https://s3.amazonaws.com/codecademy-content/courses/React/react_photo-puppy.jpeg'); e.target.setAttribute('alt', 'doggy'); } const kitty = ( <img src="https://s3.amazonaws.com/codecademy-content/courses/React/react

Calling a javascript function in JSX: why does calling a function without the () work?

喜你入骨 提交于 2019-11-30 15:55:38
Currently on Codecademy and learning about React. Came to this code: import React from 'react'; import ReactDOM from 'react-dom'; function makeDoggy(e) { // Call this extremely useful function on an <img>. // The <img> will become a picture of a doggy. e.target.setAttribute('src', 'https://s3.amazonaws.com/codecademy-content/courses/React/react_photo-puppy.jpeg'); e.target.setAttribute('alt', 'doggy'); } const kitty = ( <img src="https://s3.amazonaws.com/codecademy-content/courses/React/react_photo-kitty.jpg" alt="kitty" onClick={makeDoggy} /> ); ReactDOM.render(kitty, document.getElementById(

尤大live笔记

帅比萌擦擦* 提交于 2019-11-30 14:35:39
vue2.0 源码 vue2.0 源码学习 。 框架选型 框架选型不谈场景都是刷流氓,不同的场景下、开发者群体、偏好不一致,多种方案的并存是必然的有益的。 如何选型:经验和对框架工具背后想要解决的问题深入理解 组件 主流框架都以组件作为基本的抽象单元,组件的发展史 page->application,模块封装. react 揭示了组件可以是函数, 组件的分类 接入型 container 展示型 component 交互型 比如各类加强版的表单组件,通常强调复用 功能型 比如 <router-view> , <transition> ,作为一种扩展、抽象机制存在。 模板和 jsx 对比,jsx 灵活性高,模板在以展示型为主的场景下不差,jsx 在功能性组件的书写远超模板 colocation: 把该放的东西放一起和以前的 html、js、css 分离相对应 变化侦测机制和渲染机制 渲染中的申明式和命令式 命令式的维护问题,申明式申明数据和 dom 的映射关系,不需要手动去维护操作 view = render(state) vue的模板也是编译成渲染函数,模板和 jsx 的本质是一样的,具体实现可以是 vdom 也可以是细粒度的绑定如 vue1; 变化侦测: 变化侦测 ppt 。 被人诟病,为啥 vue 的声明式写法就是推崇的? 前者的作用域的全局的,vue 模板是在特定的作用域中

react native不能打包jsx文件

别说谁变了你拦得住时间么 提交于 2019-11-30 14:25:53
1. 这个问题我还是没有解决 参考了 https://blog.csdn.net/cy22201222/article/details/77877244 这篇博文 ,但是开发目录结构已经变了,packager目录根本没有,哪位兄弟解决了,给我个提示,先谢过了 2. 为了不耽误项目进度 , 嘿嘿,只能将jsx文件修改成js文件,反正不影响,😭(我不服气,不服气,气) 来源: https://www.cnblogs.com/tengyuxin/p/11595924.html