我是 ReactJS 的新手,正在学习 udemy 上的 React 基础类(class)。 我的控制台日志上出现以下错误。有人可以帮助我吗?
bundle.js:21818 Uncaught TypeError: _this2.props.selectBook is not a function
如有任何帮助,我们将不胜感激。谢谢。
containers/book-list.js
import React, { Component } from 'react';
import { connect } from 'react-redux';
import { selectBook } from '../actions/index';
import { bindActionCreators } from 'redux';
class BookList extends Component {
renderList() {
return this.props.books.map((book) => {
return (
<li
key={book.title}
onClick={() => this.props.selectBook(book)}
className="list-group-item">
{book.title}
</li>
);
});
}
render() {
return (
<ul className="list-group col-sm-4">
{this.renderList()}
</ul>
)
}
}
function mapStateToProps(state) {
return {
books: state.books
};
}
//Anythin returned from this function will end up as props
// on the BookList container
function mapDispatchToProps(dispatch) {
// whenever selectBook is called, the result should be passed
// to all of our reducers
return bindActionCreators({ selectBook: selectBook }, dispatch);
}
// Promote BookList from a component to a container - it needs to know
// about this new dispatch method, selectBook. Make it available
// as a prop.
export default connect(mapStateToProps)(BookList);
actions/index.js
export function selectBook(book) {
console.log('A book has been selected:', book.title);
}
组件/app.js
import React, { Component } from 'react';
import BookList from '../containers/book-list';
export default class App extends Component {
render() {
return (
<div>
<BookList />
</div>
);
}
}
最佳答案
我自己找到了答案。
// didnt have included the mapDispatchToProps function call in below lines.
export default connect(mapStateToProps, mapDispatchToProps)(BookList);
关于reactjs - 未捕获的 TypeError : _this2. props.selectBook 不是函数,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/45133591/