#reactjs #ecmascript-6
#reactjs #ecmascript-6
Вопрос:
Я пишу программу, в которой список элементов в массиве через state передается из компонента приложения в компонент QuizApp, а из этого — в компонент Turn. Я предполагаю, что проблема в том, что компонент Turn не может прочитать реквизиты, которые передаются из компонента AuthorsQuiz.
Я попытался преобразовать объект состояния в массив, но он по-прежнему выдает ту же ошибку:
TypeError: Cannot read property 'imageUrl' of undefined
App.js
import React, { Component } from 'react';
import AuthorsQuiz from './Components/AuthorsQuiz';
import './App.css';
import {shuffle,sample} from 'underscore';
const authors =[
{
name: 'Mark Twain',
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imageSource:'Wikimedia Commons',
books: ['The Adventures of Huckleberry Finn']
},
{
name: 'Joseph Conrad',
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imageSource:'Wikimedia Commons',
books: ['Heart of darkness']
},
{
name: 'J K Rowling',
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imageSource:'Wikimedia Commons',
imageAttribution:'Daniel Ogren',
books: ['Harry Porter and sorcerers stone']
},
{
name: 'Stephen King',
imageUrl:'https://vignette.wikia.nocookie.net/stephenking/images/a/a0/Stephen_king-coming-to-boulder.jpg/revision/latest/scale-to-width-down/275?cb=20170530002714',
imageSource:'Wikimedia Commons',
imageAttribution:'Pingiun',
books: ['The shining', 'IT']
},
{
name: 'Charlse Dickens',
imageUrl:'https://www.biography.com/.image/ar_1:1,c_fill,cs_srgb,g_face,q_auto:good,w_300/MTE5NDg0MDU0OTQ1MDM5ODg3/charles-dickens-9274087-1-402.jpg',
imageSource:'Wikimedia Commons',
books: ['David Copperfield', 'A Tale of Two Cities']
},
{
name: 'William Shakespear',
imageUrl:'http://shakespeare.mit.edu/shake.gif',
imageSource:'Wikimedia Commons',
books: ['Hamlet', 'Macbeth', 'Remeo and Juliet']
}
]
class App extends Component {
constructor(){
super();
this.state=[{
turnData: '',
}]
this.getTurnData=this.getTurnData.bind(this);
}
getTurnData=(authors)=>{
const allBooks = authors.reduce(function (p,c){
return p.concat(c.books)
}, [])
const fourRandomBooks = shuffle(allBooks).slice(0,4)
const answer = sample(fourRandomBooks);
return{
books: fourRandomBooks,
author: authors.find((author)=>author.books.some((title)=>title===answer))
}
}
componentDidMount()
{
console.log("Inside componentDidMount" this.getTurnData(authors));
this.setState([{ turnData: this.getTurnData(authors) }]);
}
render() {
return (
<div className="container-fluid">
<AuthorsQuiz data={this.state.turnData}/>
</div>
)
}
}
export default App;
AuthorsQuiz.js
import React, { Component } from 'react';
class AuthorsQuiz extends Component {
render() {
return (
<div className="container-fluid">
<Hero/>
<Turn books={this.props.data}/>
<Continue/>
</div>
)
}
}
const Hero=()=>{
return(
<div>
<div className="jumbotron jumbotron-fluid">
<div className="container">
<h1 className="display-4">Author Quiz by Smit Sanghvi</h1>
<p className="lead">This is a modified jumbotron that occupies the entire horizontal space of its parent.</p>
</div>
</div>
</div>
);
}
const Books=(props)=>{
return(
<div>
{props.title.name}
</div>
);
}
const Turn=(props)=>{
//console.log(props.books.imageUrl);
return(
<div className="row">
<div className="col-sm-5">
<img alt="pic" src={props.books.imageUrl}></img>
</div>
<div className="col-sm-7">
{props.books.map(title=>
<Books title={title} key={title}/>)}
</div>
</div>
);
}
const Continue=()=>{
return(
<div>
</div>
);
}
export default AuthorsQuiz;
Комментарии:
1. Мы не сможем помочь вам получить «желаемые результаты», если вы не сообщите нам, каковы они… какое поведение вы ищете? Какое поведение вы на самом деле видите? Какие подходы вы уже пробовали? Есть ли какие-либо ошибки консоли?
2. Проверьте ошибку. Я хочу сохранить данные функции в turnData и передать в компонент AuthorsQuiz
3.
getTurnDataявляется методом класса — ключевое слово не требуетсяfunction4. @SakoBu изменил его, не выдав ошибку :
./src/App.js Line 52: 'getTurnData' is not defined no-undef5. Кроме того,
classэто зарезервированное ключевое слово JS… Вы не можете использоватьclassв CSS изменение этого наclassName… как в<div className="...">
Ответ №1:
Ошибка, возникающая в конструкторе из имени вашей функции. Вы должны использовать this.getTurnData вместо getTurnData .
Но я думаю, вам следует установить состояние в componentDidMount конструкторе жизненного цикла mothod вместо этого. Это лучше для стандартов React.
componentDidMount()
{
console.log(this.getTurnData(authors));
this.setState({ turnData: this.getTurnData(authors) });
}
render()
{
const { turnData } = this.state; // Get turnData from state by destructing technique
if (!turnData) // Check the state. Because the first render going to be before componentDidMount method.
{
return <div>Loading or something like that</div>;
}
return (
<div className="container-fluid">
<AuthorsQuiz data={turnData}/>
</div>
)
}