ReactJS

Question

我有一个为子组件传递道具的组件：

import React, { Component } from 'react'
import { BrowserRouter as Router, Route, NavLink } from 'react-router-dom'    
import PortfolioPage from './PortfolioPage'  

class PortfolioMenu extends Component {
  constructor(props) {
    super(props)
    // here is the prop to be passed for a child component
    this.state = {       
      interiorsUrl: "http://localhost:3001/interiors"
    }
  }

  render() {    
    return (
      <div>
        <Router>
          <div class="wrapper2">
            <div class="wrapper-portfolio">
              // here is the line to pass the prop
              <Route exact path='/portfolio/interiores' render={() => <PortfolioPage interiorsUrl={this.state.interiorsUrl}/>} />
            <nav>
              <ul>   
                <li><NavLink activeClassName="active" exact to="/portfolio/interiores">• interiores</NavLink></li>                  
              </ul>
            </nav>
          </div>
        </Router>
      </div>
    )
  }
}


export default PortfolioMenu

接收道具的子组件如下：

import React, { Component } from 'react'
import axios from 'axios'
import Modal from 'react-responsive-modal';
import Lightbox from 'react-lightbox-component';


const URL = this.props.interiorsUrl;


class PortfolioPage extends Component {
  constructor(props) {
    super(props);
    this.state = {
      result: []
    }

  }

  componentDidMount() {
    axios.get(URL)

//...rest of the code omitted

在上面的组件中，控制台上有一条错误消息：

TypeError: Cannot read property 'interiorsUrl' of undefined

指向此代码行：

 const URL = this.props.interiorsUrl;

我做错了什么？谢谢。

Answer 1

您需要从组件内部调用 this.props.interiorsUrl。

所以在 class

之后的任何地方而不是 { }

例如：

componentDidMount() {
    axios.get(this.props.interiorsUrl)
}

Answer 2

class PortfolioPage extends Component {
  constructor(props) {
    super(props);
    this.state = {
      result: []
    }

  }

  componentDidMount() {
    const { interiorsUrl } = this.props;
    axios.get(interiorsUrl)
      .then(response => this.setState({ result: response.data }))
      .catch(e => console.error(e));

  }
  //...rest of the code omitted

ReactJS - 我无法通过 Route 为子组件传递道具

ReactJS - I can't pass prop trought Route for a child component

javascript

react-router-dom