React进阶学习之组件的解耦之道

class Panel extends React.Component {
 renderHeading() {
 // ...
 }

 renderBody() {
 // ...
 }

 render() {
 return (
 <div>
 {this.renderHeading()}
 {this.renderBody()}
 </div>
 );
 }
}

const PanelHeader = (props) => (
 // ...
);

const PanelBody = (props) => (
 // ...
);

class Panel extends React.Component {
 render() {
 return (
 <div>
 // Nice and explicit about which props are used
 <PanelHeader title={this.props.title}/>
 <PanelBody content={this.props.content}/>
 </div>
 );
 }
}

class CommentTemplate extends React.Component {
 static propTypes = {
 // Declare slots as type node
 metadata: PropTypes.node,
 actions: PropTypes.node,
 };

 render() {
 return (
 <div>
 <CommentHeading>
  <Avatar user={...}/>

  // Slot for metadata
  <span>{this.props.metadata}</span>

 </CommentHeading>
 <CommentBody/>
 <CommentFooter>
  <Timestamp time={...}/>

  // Slot for actions
  <span>{this.props.actions}</span>

 </CommentFooter>
 </div>
 );
 }
}

class Comment extends React.Component {
 render() {
 const metadata = this.props.publishTime ?
 <PublishTime time={this.props.publishTime} /> :
 <span>Saving...</span>;

 const actions = [];
 if (this.props.isSignedIn) {
 actions.push(<LikeAction />);
 actions.push(<ReplyAction />);
 }
 if (this.props.isAuthor) {
 actions.push(<DeleteAction />);
 }

 return <CommentTemplate metadata={metadata} actions={actions} />;
 }
}

class Document extends React.Component {
 componentDidMount() {
 ReactDOM.findDOMNode(this).addEventListener('click', this.onClick);
 }

 componentWillUnmount() {
 ReactDOM.findDOMNode(this).removeEventListener('click', this.onClick);
 }

 onClick = (e) => {
 if (e.target.tagName === 'A') { // Naive check for <a> elements
 sendAnalytics('link clicked', {
 documentId: this.props.documentId // Specific information to be sent
 });
 }
 };

 render() {
 // ...
 }
}

function withLinkAnalytics(mapPropsToData, WrappedComponent) {
 class LinkAnalyticsWrapper extends React.Component {
 componentDidMount() {
 ReactDOM.findDOMNode(this).addEventListener('click', this.onClick);
 }

 componentWillUnmount() {
 ReactDOM.findDOMNode(this).removeEventListener('click', this.onClick);
 }

 onClick = (e) => {
 if (e.target.tagName === 'A') { // Naive check for <a> elements
 const data = mapPropsToData ? mapPropsToData(this.props) : {};
 sendAnalytics('link clicked', data);
 }
 };

 render() {
 // Simply render the WrappedComponent with all props
 return <WrappedComponent {...this.props} />;
 }
 }

 return LinkAnalyticsWrapper;
}

class Document extends React.Component {
 render() {
 // ...
 }
}

export default withLinkAnalytics((props) => ({
 documentId: props.documentId
}), Document);