javascript – 语义UI反应模式:Portal.render():必须返回有效的React元素(或null)
作者:互联网
我试图在我的反应仪表板应用程序中实现semantic-ui-react modal,我创建了一个ModalManager组件,它将与Redux一起用于管理Modal_Open和Modal_Close的状态.
Redux部分工作得很好但是,在渲染期间我只看到了“Semantic-UI-React-Modal组件”的问题.下面是错误信息
invariant.js?7313:42 Uncaught Error: Portal.render(): A valid React element (or null) must be returned. You may have returned undefined, an array or some other invalid object.
at invariant (invariant.js?7313:42)
at ReactCompositeComponentWrapper._renderValidatedComponent (ReactCompositeComponent.js?063f:830)
at ReactCompositeComponentWrapper.performInitialMount (ReactCompositeComponent.js?063f:361)
at ReactCompositeComponentWrapper.mountComponent (ReactCompositeComponent.js?063f:257)
at Object.mountComponent (ReactReconciler.js?c56c:45)
at ReactCompositeComponentWrapper.performInitialMount (ReactCompositeComponent.js?063f:370)
at ReactCompositeComponentWrapper.mountComponent (ReactCompositeComponent.js?063f:257)
at Object.mountComponent (ReactReconciler.js?c56c:45)
at Object.updateChildren (ReactChildReconciler.js?c86a:121)
at ReactDOMComponent._reconcilerUpdateChildren (ReactMultiChild.js?e1f8:206)
下面是模态管理器的代码,它能够在返回时显示其他组件(一些测试图表)< span> {renderedComponent}< / span> ;;
我怀疑问题是当渲染的组件是Semantic-Ui-React-Modal时,其他组件工作得很好.
我正在使用React 16.4.1
Modal Manager Component
import React, { Component } from "react";
import { connect } from "react-redux";
import { Modal } from "semantic-ui-react";
import { closeModal } from "../../Redux/actions/modalActions";
export class ModalManager extends Component {
render() {
const { modalConfiguration } = this.props;
const defaultProps = {
defaultOpen: true,
closeIcon: true,
onClose: this.props.closeModal
};
let renderedComponent;
if (modalConfiguration) {
const { modalProps = {} } = modalConfiguration;
renderedComponent = <Modal {...Object.assign({}, modalProps, defaultProps)} />;
}
return <span>{renderedComponent}</span>;
}
}
function mapStateToProps(state) {
return { modalConfiguration: state.modals };
}
export default connect(mapStateToProps, { closeModal })(ModalManager);
Home Page
class HomePage extends React.Component {
state = {
expanded : false,
isLoading: false,
error: null
}
componentDidMount() {
this.setState({isLoading: true});
axios.get(API)
.then(result => this.setState({
T_Bugs: result.data.map(x => Number(x.code_bugs)).reduce((a, b) => a + b, 0),
isLoading: false
}))
.catch(error => this.setState({
error,
isLoading: false
}))
}
render() {
if (this.state.expanded) {
this.setState( () => {
return {
expanded : false
};
});
}
return (
<div>
<Main expanded={this.props.expandedState}>
<h1>Welcome to Stemplot</h1>
<Card.Group stackable={true} itemsPerRow={8}>
<StatCard loading={this.state.isLoading} image={this.state.isLoading ? "/images/spinner.gif":"/images/Duplicate.svg"} description=" XXX" title="Duplicate Lines" value={nFormat(this.state.T_Duplicate_Lines)}/>
</Card.Group>
<br/>
<ModalManager />
</Main>
</div>
)
}
}
const mapStateToProps = (state) => {
return {
expandedState: state.sidebarReducer.expanded
};
}
export default connect(mapStateToProps) (HomePage);
解决方法:
您没有在Modal中渲染任何子项,也没有按照docs传递所需的道具
class App extends React.Component {
state = { openModal: false }
toggleModal = () => this.setState(state => ({ openModal: !state.openModal }));
render() {
const { openModal } = this.state;
return (
<div>
<button onClick={this.toggleModal}>Toggle Modal</button>
<Modal open={openModal} closeIcon onClose={this.toggleModal}>
<Header icon='browser' content="I' m a header" />
<Modal.Content>
<h3>I'm a content</h3>
</Modal.Content>
</Modal>
</div>
);
}
}
标签:javascript,reactjs,react-redux,react-router,semantic-ui-react 来源: https://codeday.me/bug/20190823/1697312.html