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ReactJs - TypeError: Cannot assign to read only property 'transform' of object '#<Object>'

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问题 I was planning to change the inline css by hovering the element. But react freaked out cuz all the properties of the 'style' object in this class are somehow all readonly. But it is fine to modify it in 'render' method. I searched the error message, many people get this error message by modifying the props object.But this one is not even in the props object. Any ideas? Here's my code: import React, { Component } from 'react'; export default class Game extends Component { state = { } style = {

How to fix babel react “Uncaught SyntaxError: Unexpected token <”

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问题 I am having problem with react setup via CDN. Her is my html: <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> <link rel="stylesheet" type="text/css" href="css/main.css"> <script src="https://cdnjs.cloudflare.com/ajax/libs/react/0.14.0/react.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/react/0.14.0/react-dom.js"></script> <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/babel-standalone/6.7.7/babel.min.js"><

Conditionally render list with Higher Order Component

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问题 My app has a feature toggle functionality that tells my UI whether or not a piece of UI should be rendered. I would like to create a Higher Order Component to conditionally render these types of components. In one scenario, I'm trying to conditionally render a list, but I'm running into this error: ConditionalRender(...): A valid React element (or null) must be returned. You may have returned undefined, an array or some other invalid object. This makes sense since I just am trying to render

Setting conditional onClick behaviour in ReactJS

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问题 (This is my first time using React) I am working on app that filters videos based on the button click and this is the code below const data = [{ address: 'https://www.youtube.com/watch?v=eIrMbAQSU34', category: 'java' }, { address: 'https://www.youtube.com/watch?v=RRubcjpTkks', category: 'C#' }]; class User extends React.Component { constructor(props){ super(props); this.state={ videos : data, }; } render(){ return ( <div className="box"> <div className="buttons-filter"> <button onClick={()=>

React Native render Components from String variable

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问题 Or maybe the question should have been, How to convert string to JSX? In any case, I am trying to do a performance hack on my react native app that requires me to render React native components from a string variable. For instance, let item = "<View> <Text> This is an item </Text> </View>"; Now in my render function, I want to render it like so: render() { return ( <View> {item} </View> ); } As it is now if I try to run the application it gives an error because I am trying to render text

Issue with React.PropTypes.func.isRequired

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问题 Am new in React and trying to define PropTypes, but seems it's no longer working : Below is how I was working with it : React.PropTypes.func.isRequired Below is the error am getting : Then this is the component am having what am I missing : import React, {Component} from 'react'; import {Input,Icon,Row,Card, Button} from 'react-materialize' import '../css/signup.css' import PropTypes from 'prop-types'; class SignUpForm extends Component { constructor(props) { super(props); this.state =

Issue with React.PropTypes.func.isRequired

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Jest tests on React components: Unexpected token “<”

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问题 Trying to set up Jest to test my React components (Technically I'm using Preact) but same idea... Anytime I try to get a coverage report, I get errors when it hits any jsx syntax. Error Running coverage on untested files...Failed to collect coverage from /index.js ERROR: /index.js: Unexpected token (52:2) 50 | 51 | render( > 52 | <Gallery images={images} />, | ^ I've tried following the docs and similar issues but no luck! It seems as though my babel settings aren't getting used by Jest. Any

Jest tests on React components: Unexpected token “<”

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Ternary operator in react native

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问题 <Container> <Header function1={()=>this.props.navigation.openDrawer()}/> <Content> {this.state.formInputs.formFeilds.map((data)=>( {this.state[`${data}`]?<Item floatingLabel success>:<Item floatingLabel>} <Label>data</Label> <Input value={data}/> <Icon name='checkmark-circle' /> </Item> ))} </Content> </Container> ) I have this simple return statement in render function of my react native class I want to use <Item floatingLabel success> when this this.state[ ${data} ] is true else <Item