我有一个主要组件Resume
和一个名为Header
的孩子:
class Resume extends Component {
constructor(props) {
super();
this.state = {
data: {}
}
}
componentDidMount() {
this.setState( this.state = data);
}
render() {
return (
<div className="Resume">
<Header data={this.state.header} />
<Skills data={this.state.skills} />
</div>
);
}
}
export default Resume;
class Header extends Component {
render() {
return (
<div className="header">
<h1>{JSON.stringify(this.props.data.title)}</h1>
</div>
);
}
}
My simple sample data so far is:
{
"header": {
"title": "Tim Smith's Resume"
},
"skills": [
{"name": "HTML", "duration": 14}
]
}
我为什么得到:TypeError: Cannot read property 'title' of undefined
JSON#stringify
您的标题属性已经是一个字符串。componentDidMount
不是我们正在设置状态。尝试使用
componentDidMount()
const data = {}; // Define data or get it like you want
this.setState({
...data
});
}
this.state = { header: {}, skills: {} }
不是你做的。看起来你没有正确设置<Resume/>
组件的状态。请尝试以下调整:
componentDidMount() {
// This will set the `data` field of your component state, to the
// value of the `data` variable.
this.setState({ data : data });
}