小编use*_*kin的帖子

我刚接触使用react并遇到了问题:

未捕获的TypeError:无法读取null的属性"setState".

基本上我要做的是,用户可以点击三个不同的标题,点击后,它将呈现特定于该标题的特定模板.这是我正在使用的代码,它给了我这个错误:

class Selection extends React.Component {

constructor(props) {
    super(props);
    this.state = {selections: [], donateActive: true, fundraiseActive: false, speakActive: false };
}

componentDidMount() {
    this.setState({
        selections: selectionData.selections
    })
}

componentWillUnMount(){
    console.log("unmounted!"); 
}

donateOnClick() {
    this.setState({ donateActive: true, fundraiseActive: false, speakActive: false});
}

fundraiseOnClick() {
    this.setState({ fundraiseActive: true, donateActive: false, speakActive: false});
}

speakOnClick() {
    this.setState({ speakActive: true, fundraiseActive: false, donateActive: false});
}

donateTemplate() {
    return (
        <div>
            <h1>donate template</h1>
        </div>
    )
}   

fundraiseTemplate() {
    return (
        <div>
            <h1>fundraise template</h1> …