jsx | 易学教程

How to have nested loops with map in JSX?

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问题 I can't achieve to have two nested map : render() { return ( <table className="table"> <tbody> {Object.keys(this.state.templates).map(function(template_name) { return ( <tr key={template_name}><td><b>Template: {template_name}</b></td></tr> {this.state.templates[template_name].items.map(function(item) { return ( <tr key={item.id}><td>{item.id}</td></tr> ) })} ) })} </tbody> </table> ) } This gives a SyntaxError: unknown: Unexpected token . How do you nest map calls in JSX? 回答1: You need to

在EOS区块链上使用EOSJS和scatter开发dApp

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由于我一直在深入研究EOS dApp的开发，我看了不少好文章。在这里，我汇总了下做一些研究后得到的所有知识。在本文中，我将解释如何使用EOSJS和scatter。我假设你对智能合约以及如何在EOS区块链上部署它们有基本的了解，因为我将在本文中跳过该部分。我们在构建什么？我们正在构建一个简单的todo dApp。我们将为CRUD（创建，读取，更新和删除）操作编写智能合约，并将使用EOSJS和scatter与已部署的合同进行交互。CRUD操作包括创建，完成，删除和获取待办事项。我们将使用Jungle Testnet来部署我们的智能合约。必备知识 EOS EOSJS Scatter Scatter设置 Scatter用于为区块链签署交易，并在不泄露密钥的情况下向应用程序提供个人信息。要设置Scatter钱包，请关注这个视频。在Scatter设置中，必须在网络中添加Jungle testnet，其中包含以下详细信息： Name: Jungle Testnet Domain or IP: dev.cryptolions.io // It might be changed, so check for the latest one Port: 38888 chainId

Using a forwardRef component with children in TypeScript

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问题 Using @types/react 16.8.2 and TypeScript 3.3.1. I lifted this forward refs example straight from the React documentation and added a couple type parameters: const FancyButton = React.forwardRef<HTMLButtonElement>((props, ref) => ( <button ref={ref} className="FancyButton"> {props.children} </button> )); // You can now get a ref directly to the DOM button: const ref = React.createRef<HTMLButtonElement>(); <FancyButton ref={ref}>Click me!</FancyButton>; I get the following error in the last

emacs React/JSX 开发配置

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> 开始一些简单的配置，不需要的可以跳过 # helm helm 的配置是最基础的增强emacs插件之一，pretty nice的界面以及Lazy match ## helm ### 安装 `M-x package-install RET helm` 如果自己配置了管理插件的管理器可以在你的配置文件中安装，不在赘述 ### 简单的配置在你的配置文件中保存下面的配置，例如 `~/.emacs/init.el` ```lisp (global-set-key (kbd "M-x") 'helm-M-x) (global-set-key (kbd "C-x b") 'helm-buffers-list) (global-set-key (kbd "C-x C-b") 'helm-buffers-list) (global-set-key (kbd "C-x C-f") 'helm-find-files) ``` 上面将helm命令替换emacs自带的`M-x` `C-x C-f` `C-x b` `C-x C-b` ```lisp (define-key helm-map (kbd "<tab>") 'helm-execute-persistent-action) (define-key helm-map (kbd "C-i") 'helm-execute-persistent

emacs 前端插件推荐[emmet-mode]

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安装篇在vim下使用emmet极大地提高了开发效率，安利下emacs下的emmet-mode emmet-mode自带的 pacakge.el 就有安装，直接体验的同学可以直接下行安装 `M-x` `package-install` `emmet-mode` 也可以在配置文件中加入(需重启一次emacs) (setq package-archives '(("elpa" . "http://tromey.com/elpa/") ("gnu" . "http://elpa.gnu.org/packages/") ("marmalade" . "http://marmalade-repo.org/packages/") ("melpa" . "http://melpa.org/packages/") )) (unless (package-install-p "emmet-mode") (package-install "emmet-mode")) 装上emmet,下面添加到我们的 js/jsx/html 以jsx为例 (add-to-list 'auto-mode-alist '("\\.jsx$" . 'emmet-mode)) 也可以作为hook的方式加入到主模式中(推荐一下web-mode，支持js/php/jsx(react)...几乎所有web开发语言) (add-to

React入门看这篇就够了

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摘要：很多值得了解的细节。原文： React入门看这篇就够了作者： Random Fundebug 经授权转载，版权归原作者所有。 React 背景介绍 React 入门实例教程 React 起源于 Facebook 的内部项目，因为该公司对市场上所有 JavaScript MVC 框架，都不满意，就决定自己写一套，用来架设 Instagram 的网站。做出来以后，发现这套东西很好用，就在2013年5月开源了。什么是React A JAVASCRIPT LIBRARY FOR BUILDING USER INTERFACES 用来构建UI的 JavaScript库 React 不是一个 MVC 框架，仅仅是视图（V）层的库 React 官网 React 中文文档特点使用 JSX语法创建组件，实现组件化开发，为函数式的 UI 编程方式打开了大门性能高的让人称赞：通过 diff算法和虚拟DOM 实现视图的高效更新 HTML仅仅是个开始 > JSX --TO--> EveryThing - JSX --> HTML - JSX --> native ios或android中的组件（XML） - JSX --> VR - JSX --> 物联网为什么要用React 使用组件化开发方式，符合现代Web开发的趋势技术成熟，社区完善，配件齐全，适用于大型Web项目

How do I pass an HTML element to a higher-order function (HOC) in React?

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问题 I often use HOCs to provide additional functionality to an existing React component, which is pretty straightforward: import Component from '/path/to/Component'; import higherOrderComponent from '/path/to/higherOrderComponent'; const EnhancedComponent = higherOrderComponent(Component); However, I need to wrap a simple HTML input , which doesn't exist as a standalone React component. I tried const EnhancedInput = higherOrderComponent(<input />); and got the following error: Uncaught Error:

Create-React-App build - “Uncaught SyntaxError: Unexpected token <”

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问题 I realize this question has been asked multiple times but nothing has worked for me... I'm trying to create a static build of a create-react-app project but I'm getting the following errors: Uncaught SyntaxError: Unexpected token < 1.ca81c833.chunk.js:1 Uncaught SyntaxError: Unexpected token < main.7ced8661.chunk.js:1 Due to these files being minified, I'm not sure where to begin in debugging them. Per other SO responses, here are some things I've tried: //Original index.html file, which gets

changing font size of material-ui buttons, and having the buttons scale?

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问题 I seem to be having an issue with changing the font sizes on Material-UI's (for React) RaisedButton and having the button itself scale properly with it. <RaisedButton label={<span className="buttonText">Log in Here</span>} /> CSS: .buttonText { font-size: 63px; } The text size changes but the button itself doesn't scale with it. Does anyone know the proper solution to this? I want to button to scale with the text size. 回答1: The problem is Material-UI inlines all of the styles for their

How to convert html elements into JSX?

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问题 I have basically two questions. 1.) I have this basic reactjs component. How can I convert it into JSX? I mean I want this code to look like reactjs style code. 2.) If I receive an array from backend like this [ '/parent-folder-1/child-folder-1/file1.jpg', '/parent-folder-1/child-folder-1/file2.jpg', '/parent-folder-1/child-folder-2/file3.jpg', '/parent-folder-2/child-folder-1/somefile.jpg' ] How can I create nested object dynamically like the one shown in the code? I don't know how deep

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