我开始使用React JS开发一个Web应用程序。我从主题森林购买了一个主题。在主题中,他们在组件中使用了这样的撰写。
...Other code here
Login.propTypes = {
classes: PropTypes.shape({}).isRequired,
width: PropTypes.string.isRequired
};
export default compose(withWidth(), withStyles(themeStyles, { withTheme: true }))(Login);
如您所见,导出组件时,他们的代码最后使用了compose。我无法修改其建筑结构。我现在想做的就是也喜欢使用react的connect功能。
通常使用connect代替compose。现在,如果我想使用connect来处理应用程序的状态,如何将其与compose一起使用?
答案 0 :(得分:14)
const enhance = compose(
withRouter,
withStyles(styles, 'some style'),
connect(mapStateToProps, mapDispatchToProps),
....
export default enhance(MyComponent);
答案 1 :(得分:5)
import {bindActionCreators} from 'redux';
import compose from 'recompose/compose';
import { connect } from 'react-redux';
...Other code here
function mapStateToProps(state) {
return {
//return state
}
}
function mapDispatchToProps(){
return bindActionCreators({
//actions
}, dispatch);
}
Login.propTypes = {
classes: PropTypes.shape({}).isRequired,
width: PropTypes.string.isRequired
};
export default compose(withWidth(), withStyles(styles, {withTheme: true}), connect(mapStateToProps, mapDispatchToProps))(Login);
我希望这可以解决您的问题。
答案 2 :(得分:0)
compose
doesn't get rid of the pattern of passing a function to the result of a function call, but it reduces its use to one.
Only one HOC, no gain from using compose:
// withStyles, without compose
export default withStyles(styles)(MyComponent)
// withStyles, with compose
export default compose(withStyles(styles))(MyComponent)
// connect, without compose
export default connect(mapStateToProps, mapDispatchToProps)(MyComponent)
// connect, with compose
export default compose(connect(mapStateToProps, mapDispatchToProps))(MyComponent)
Note that starting another function call immediately after a function call, which only recently came into fashion, is still there with compose
.
With two HOCs there is a gain from compose
because the nesting of parens is less:
// two HOCs, without compose
export default connect(mapStateToProps, mapDispatchToProps)(withStyles(styles)(MyComponent))
// two HOCs, with compose
export default compose(connect(mapStateToProps, mapDispatchToProps), withStyles(styles))(MyComponent)
This still can be hard to follow if you aren't used to a nameless function being called immediately after it's created. If you prefer you can give a name to it:
// two HOCs, with compose
const enhance = compose(connect(mapStateToProps, mapDispatchToProps, withStyles(styles));
// export default enhance(MyComponent);
I prefer to use compose when there is more than one HOC, and to use it directly. I think cutting down on the nesting is useful but giving it a generic name like enhance
is unnecessary.
答案 3 :(得分:0)
import {connect} from "react-redux";
import {compose} from 'redux'
class BookList extends Component {
componentDidMount() {
const {bookstoreService} = this.props;
const data = bookstoreService.getBooks();
this.props.booksLoaded(data);
}
render() {
const {books} = this.props;
return (
<ul>
{books.map(book => {
return (
<li key={book.id}>
<BookListItem book={book}/>
</li>
);
})}
</ul>
);
}
}
const mapStateToProps = ({books}) => {
return {books};
};
const mapDispatchToProps = dispatch => {
return {
booksLoaded: newBooks => {
dispatch(booksLoaded(newBooks));
}
};
};
export default compose(withBookstoreService(), connect(mapStateToProps, mapDispatchToProps))(BookList);
答案 4 :(得分:0)
在将let storyboard = UIStoryboard(name: "NAMEOFYOURSTORYBOARD", bundle: nil)
let vc = storyboard.instantiateViewController(withIdentifier: "IDOFYOURVIEW") as! CheckoutVC
vc.tableViewDayTransferedData = self. tableViewDay
self.navigationController!.pushViewController(vc, animated: true)
与Typescript一起使用时,出现以下错误:
compose
我必须通过以下方式添加JSX element type 'App' does not have any construct or call signatures. TS2604
才能使其正常工作:
ComponentType