jsx | 易学教程

Using async setState

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问题 I have function which dispatched an action. I would like to display a loader before and after the action. I know that react composing the object passed to setState . the question is how can I update the property in async way: handleChange(input) { this.setState({ load: true }) this.props.actions.getItemsFromThirtParty(input) this.setState({ load: false }) } Basically, it all worked great if I put this property as part of the application state (using Redux), but I really prefer to bring this

Vue.js 2.x render 渲染函数 & JSX

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Vue.js 2.x render 渲染函数 & JSX Vue绝大多数情况下使用 template 创建 HTML。但是比如一些重复性比较高的场景，需要运用 JavaScript 的完全编程能力，可以使用 render 函数。 1. 节点、树以及虚拟DOM 每个元素都是一个节点。每片文字也是一个节点。甚至注释也都是节点。一个节点就是页面的一个部分。每个节点都可以有子节点。比如上面的节点树就表示下面的代码： <div> <h1>My title</h1> Some text content  </div> 1.1 虚拟 DOM Vue 通过建立一个虚拟 DOM 对真实 DOM 发生的变化保持追踪。虚拟 DOM 是对Vue组件树建立起来的整个 VNode（Virtual Node）树的称呼。 1.1.1 createElement 参数 // @returns {VNode} createElement( // {String | Object | Function} // 一个 HTML 标签字符串，组件选项对象，或者 // 解析上述任何一种的一个 async 异步函数 // 必须参数 'div', // {Object} // 一个包含模板相关属性的数据对象 // 你可以在 template 中使用这些特性 // 可选参数 { //

React-Native入门指南（六）——JSX在React-Native中的应用

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React-Native入门指南 github: https://github.com/vczero/react-native-lession React-Native:用JavaScript开发你的原生应用，释放Native的UI体验，体验 Hybird开发效率。最近一个星期写的文章如下，链接是github page的，其实也可以在系列博客找到相应文章： Lession1: Hello React-Native Lession2: 认识代码结构 Lession3: css和布局 Lession4: 学会React-Native布局（一） Lession5: 学会React-Native布局(二) Lession6: UI组件 Lession7: JSX在React-Native中的应用还有几篇会时刻更新： Lession8: 自己动手写组件 Lession9: 模块化开发 Lession10: 搭建项目架构 Lession11: 源码分析第六篇JSX在React-Native中的应用一、JSX概述你一定疑问为什么要用JSX？其实这不是必需，而是建议。只是因为React是作为MVC中的V,是为UI而生，所以，React-Native使用JSX更能像HTML样表达树形结构，其实HTML的超类就是XML,React-Native将这个带到了解放前

Display images in React using JSX without import

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问题 The problem i face is with img tag. When a single is concerned, The below code loads the image: import image1 from './images/image1.jpg; <img src={image1} /> But the below code doesn't load: <img src={'./images/image1.jpg'}/> or <img src='./images/image1.jpg'/> I need to loop through json , something like [{'img':'./images/image1.jpg','name':'AAA'},{'img':'./images/image2.jpg','name':'BBB'}] and display each of them as image with name as footer. Looping is fine but images doesn't load.It is

How to Call a Function inside a Render in React/Jsx

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问题 I want to call a function inside some embedded html. I tried the following but the function isn't called. Would this be the incorrect way of calling a function inside a render method? import React, { Component, PropTypes } from 'react'; export default class PatientTable extends Component { constructor(props) { super(props); this.state = { checking:false }; this.renderIcon = this.renderIcon.bind(this); } renderIcon(){ console.log("came here") return( <div>Function called</div> ) } render() {

ReactJs: What should the PropTypes be for this.props.children?

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问题 Given a simple component that renders its children: class ContainerComponent extends Component { static propTypes = { children: PropTypes.object.isRequired, } render() { return ( <div> {this.props.children} </div> ); } } export default ContainerComponent; Question: What should the propType of the children prop be? When I set it as an object, it fails when I use the component with multiple children: <ContainerComponent> <div>1</div> <div>2</div> </ContainerComponent> Warning: Failed prop type:

React(JSX语法)----JSX拼写

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注意：For DOM differences,such as the inline style attribute,check here . // bad: it displays "FIrst · second" <div>{'First · Second'}</div> 　　 There are various ways to work-around this issue.The easiest one is to write unicode cahracter directly in JavaScript.You need to make sure the file is saved as UTF-8 and that the proper UTF-8 directive are set so the brower will display it correctly. <div>{'First \u00b7 Second'}</div> <div>{'First' + String.fromCharCode(183) + 'Second'}</div> 　　 <div>{['First',<span>·</span>,'Second']}</div> 　　 <div dangerouslySetInnerHTML = {{__html:'First · Second'}}>

React(JSX语法)-----JSX属性

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1. if you know all the propertities that you want to place on a component ahead of time ,it is easy to use JSX: var component = <Component foo={x} bar={y}/> 2. This is an anti-pattern (反面实例---错误的) because it means that we can't help you check the right propTypes until way later.This means that your propTypes errors end up with a cryptic stack trace. var component = <Component/>; component.props.foo = x; //bad component.props.bar = y;//also bad 　　 the props should be considered immutable at this point(认为是不可改变的) .Mutating the props object somewhere else could cause unexpected consequences so

【JAVASCRIPT】React学习-JSX 语法

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摘要 react 学习包括几个部分：文本渲染 JSX 语法组件化思想数据流 JSX 语法 1. 定义 JSX 是javascript + xml 的合集，我们可以将javascript 与 html 一起编写，封装页面组件的html 格式与业务逻辑。但使用 JSX 时，一定要编写成能精确定义和反应组件及属性的树状结构，避免无法解析，虽然目前还没遇到过无法解析的情形。 2. 如何区分javascript 与 xml JSX 代码中以 {} 包含的为 javascript 代码， <> 包含的为 html 代码，解析时采用对应的语法解析器 3. React 模块约定分别使用首字母大、小写来区分本地模块的类和 HTML 标签。 html 标签，JSX 中以小写字母开头 react 组件，JSX 中以大写字母开头 <body> <div id="HelloWorld"></div> <div id="HelloWorld1"></div> </body> <script src="../build/react.js"></script> <script src="../build/JSXTransformer.js"></script> <script type="text/jsx"> var hw = <div>hello,world</div>; var

React(JSX语法)-----JSX基本语法

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JSX------HTML tags vs React Components：　　1.To render a html tag ,just use lower-case tag names in JSX; 　 var myDivElement = <div className="foo" />; React.render(myDivElement, document.body); 　　2.To render a React Component ,just create a local variable that starts with an upper-case latter ; var MyComponent = React.createClass({/*...*/}); var myElement = <MyComponent someProperty={true} />; React.render(myElement, document.body); 　　 JSX-------The Transform 　　React JSX transforms from an XML-like syntax into native JS xml elements, attributes and children are transformed into arguments to

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