react-jsx | 易学教程

Uncaught Error: Invariant Violation: findComponentRoot(…, …$110): Unable to find element. This probably means the DOM was unexpectedly mutated

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问题 What I\'m doing wrong with nested cycles in React? I have searched information in Google and I didn\'t find anything suitable. Can you help me find, what I understand wrong? As can be seen from the figure, I have data in a variable. And it works fine. But when I\'m adding a value not from this <tr> , error appears! var TableBalls80 = React.createClass({ render:function(){ var rows = this.props.rows; var columnId = 0, trKey = 0, divKey = 0, td1stKey = 0; var td2ndKey = 100; return( <table

ReactJS: “Uncaught SyntaxError: Unexpected token <”

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问题 I am trying to get started building a site in ReactJS. However, when I tried to put my JS in a separate file, I started getting this error: \"Uncaught SyntaxError: Unexpected token <\". I tried adding /** @jsx React.DOM */ to the top of the JS file, but it didn\'t fix anything. Below are the HTML and JS files. Any ideas as to what is going wrong? HTML <html> <head> <title>Page</title> <script src=\"http://fb.me/react-0.12.2.js\"></script> <script src=\"http://fb.me/JSXTransformer-0.12.2.js\">

React.js inline style best practices

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I'm aware that you can specify styles within React classes, like this: var MyDiv = React.createClass({ render: function() { var style = { color: 'white', fontSize: 200 }; return <div style={style}> Have a good and productive day! </div>; } }); Should I be aiming to do all styling this way, and have no styles at all specified in my CSS file? Or should I avoid inline styles completely? It seems odd and messy to do a little bit of both - two places would need to be checked when tweaking styling. chantastic There aren't a lot of "Best Practices" yet. Those of us that are using inline-styles, for

React / JSX Dynamic Component Name

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I am trying to dynamically render components based on their type. For example: var type = "Example"; var ComponentName = type + "Component"; return <ComponentName />; // Returns <examplecomponent /> instead of <ExampleComponent /> I tried the solution proposed here React/JSX dynamic component names That gave me an error when compiling (using browserify for gulp). It expected XML where I was using an array syntax. I could solve this by creating a method for every component: newExampleComponent() { return <ExampleComponent />; } newComponent(type) { return this["new" + type + "Component"](); }

Visual Studio 2015 JSX/ES2015 syntax highlighting

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问题 How can I get a proper syntax highlighting in Visual Studio 2015 for JSX with ES2015 code? It works fine if I remove the import and export keywords: I just updated to Visual Studio 2015 Enterprise Update 1 but it still remains the same. 回答1: UPDATE (2017-02) Node Tools for Visual Studio (NTVS) has been using the Salsa analysis engine since v1.2 and using NTVS is likely the path of least resistance for JSX support. https://github.com/Microsoft/nodejstools Read (and upvote) this answer for more

Value of this in React event handler

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问题 For some reason the value of this is being lost in react event handler. Reading the docs I thought that react did some stuff here to make sure this was set to the correct value The following doesn\'t work as I\'d expect import React from \'react\'; export default class Observer extends React.Component { handleClick() { console.log(this); //logs undefined } render() { return ( <button onClick={this.handleClick}>Click</button> ); } } But this does: import React from \'react\'; export default

Dynamic tag name in jsx and React

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问题 I try to write a React component. for html heading tags(h1,h2,h3,etc...), where the heading priority dynamically changing based on the priority we have defined in the props. Here what I try to do. <h{this.props.priority}>Hello</h{this.props.priority}> expected output: <h1>Hello</h1> This is not working. Is there any possible method to do this? 回答1: No way to do that in-place, just put it in a variable (with first letter capitalised): const CustomTag = `h${this.props.priority}`; <CustomTag

Can you force a React component to rerender without calling setState?

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问题 I have an external (to the component), observable object that I want to listen for changes on. When the object is updated it emits change events, and then I want to rerender the component when any change is detected. With a top-level React.render this has been possible, but within a component it doesn\'t work (which makes some sense since the render method just returns an object). Here\'s a code example: export default class MyComponent extends React.Component { handleButtonClick() { this

React.js inline style best practices

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问题 I\'m aware that you can specify styles within React classes, like this: var MyDiv = React.createClass({ render: function() { var style = { color: \'white\', fontSize: 200 }; return <div style={style}> Have a good and productive day! </div>; } }); Should I be aiming to do all styling this way, and have no styles at all specified in my CSS file? Or should I avoid inline styles completely? It seems odd and messy to do a little bit of both - two places would need to be checked when tweaking

Insert HTML with React Variable Statements (JSX)

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问题 I am building something with React where I need to insert HTML with React Variables in JSX. Is there a way to have a variable like so: var thisIsMyCopy = \'<p>copy copy copy <strong>strong copy</strong></p>\'; and to insert it into react like so, and have it work? render: function() { return ( <div className=\"content\">{thisIsMyCopy}</div> ); } and have it insert the HTML as expected? I haven\'t seen or heard anything about a react function that could do this inline, or a method of parsing