如何让 React onClick 工作？ （即使使用箭头功能也不起作用）

Question

即使在 SO 上的其他问题中找到建议后，我似乎仍然无法让 onClick 函数 this.changeContent 正常工作：

import React from 'react';
import Maxim from './Maxim';
import Challenge from './Challenge';
import Prompt from './Prompt';

class ContentContainer extends React.Component {
    constructor() {
        super();
        this.changeContent = this.changeContent.bind(this);
        this.state = {
            content: "maxim"
        }
    }

    changeContent(event) {
        console.log(this);
        if (this.state.content == "maxim") {
            this.setState({ content: "challenge" })
        } else {
            this.setState({ content: "maxim" })
        }
    }

    render() {
        let renderedContent = null;

        if (this.state.content == "challenge") {
            renderedContent = <Challenge content="The trick to presence is to listen to the space between the sounds." />;
        } else {
            renderedContent = <Maxim quote="Silence can be heard in every sound. All you need is to listen." />;
        }
            return (
                <div className="content-container">
                    {renderedContent}
                    <Prompt onClick={this.changeContent}/>
                </div>
            );
    }
}

export default ContentContainer;

我尝试过使用bind、箭头函数（如这里）、普通函数参考...几乎所有我在 SO 和其他地方看到的变体。我最初只有this.changeContent()，并且在页面加载时调用了该函数。我至少已经解决了这个问题，但这个函数仍然没有被调用——this.state.content 没有改变，控制台日志this 也没有。

谢谢。

Answer 1

检查这个工作示例，以类似的方式编写它：

class ContentContainer extends React.Component {
    constructor() {
        super();
        this.changeContent = this.changeContent.bind(this);
        this.state = {
            content: "maxim"
        }
    }

    changeContent(event) {
        let content = this.state.content;
        this.setState({ content: content == "challenge" ? "maxim" :  "challenge"})
    }

    render() {
        let renderedContent = null;

        if (this.state.content == "challenge") {
            renderedContent = <Challenge content="The trick to presence is to listen to the space between the sounds." />;
        } else {
            renderedContent = <Maxim quote="Silence can be heard in every sound. All you need is to listen." />;
        }
        return (
             <div className="content-container">
                 {renderedContent}
                 <Prompt onClick={this.changeContent}/>
             </div>
        );
    }
}

class Challenge extends React.Component{
   render(){
     return(
        <div>Inside Challenge<br/>{this.props.content}</div>
     )
   }
}

class Maxim extends React.Component{
   render(){
     return(
        <div>Inside Maxim<br/>{this.props.quote}</div>
     )
   }
}

class Prompt extends React.Component{
   render(){
     return(
        <div style={{paddingTop: '100px'}}>
           Inside Prompt<br/>
           <span onClick={()=>this.props.onClick()}>*Click Me to change the Component</span>
        </div>
     )
   }
}

ReactDOM.render(<ContentContainer/>, document.getElementById('app'))

<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react-dom.min.js"></script>

<div id='app'/>

Answer 2

<Prompt onClick={this.changeContent.bind(this)}/> 如果你还没有试试这个