javascript - React 不会更新作为 props 传递的组件的 props

Question

我有一个看起来像这样的 React DOM：

在MarketDepthWindow's state 我有一个isBackgroundEnabled我想作为道具传递给AskOrdersTab. 但它只传递初始道具而不是更新。它应该在MarketDepthHeaderComponent单击按钮时更新。

我认为问题在于我将它作为道具传递给TabsContainer.

我尝试更改React.Component为React.PureComponent，使用shouldComponentUpdate()，添加React.cloneElement和传递道具，TabsContainer但对我没有任何作用。

也许我犯了某种架构错误？也许我应该以某种方式使用 refs？

class AskOrdersTab extends React.Component {
  render() {
    return <div>bids</div>
  }
}

class BidOrdersTab extends React.Component {
  render() {
    return <div>asks</div>
  }
}

class MarketDepthHeaderComponent extends React.Component {
  render() {
    return <button class={this.props.isBackgroundEnabled ? 'active' : ''} onClick={this.props.handleBackgroundButtonClick}></button>
  }
}

class TabsContainer extends React.Component {
  constructor(props) {
    super(props)
    this.state = {
      tabs: props.tabs.tabs || [],
      tabHeaderComponent: props.tabs.tabHeaderComponent || ''
    }
  }

  renderComponents() {
    let tabsComponents = [];
    for (let tab of this.state.tabs.length) {
      tabsComponents.push(
        <div>{tab.component}</div>
      )
    }
    return tabsComponents;
  }

  render() {
    return (
      <>
        {this.state.tabHeaderComponent}
        {this.renderComponents()}
      </>
    );
  }
}

class MarketDepthWindow extends React.Component {

  handleBackgroundButtonClick = (event) => {
    this.setState((prevState) => ({
      isBackgroundEnabled: !prevState.isBackgroundEnabled
    }))
  }

  constructor(props) {
    super(props)
    this.state = {
      isBackgroundEnabled: true,
      handleBackgroundButtonClick: this.handleBackgroundButtonClick
    }
  }

  render() {
    let tabsProps = {
      tabs: [
        { title: 'Bid', component: <BidOrdersTab {...this.state} /> },
        { title: 'Ask', component: <AskOrdersTab {...this.state} /> }
      ],
      tabHeaderComponent: <MarketDepthHeaderComponent {...this.state} />
    }
    return <TabsContainer tabs={tabsProps} isBackgroundEnabled={this.state.isBackgroundEnabled} />
  }
}

ReactDOM.render(
  <MarketDepthWindow />,
  document.getElementById("market-depth-window")
);

标签： javascriptreactjsreact-props

Answer 1

TabsContainer 中的状态是多余的，您应该避免在每个组件中存储状态，因为它会切断更新链，请尝试使用 props 代替。

import React from "react";
import ReactDOM from "react-dom";
import "./styles.css";

class AskOrdersTab extends React.Component {
  render() {
    return <div>bids</div>;
  }
}

class BidOrdersTab extends React.Component {
  render() {
    return <div>asks</div>;
  }
}

class MarketDepthHeaderComponent extends React.Component {
  render() {
    return (
      <button onClick={this.props.onClick}>
        {this.props.isBackgroundEnabled ? "enabled" : "disabled"}
      </button>
    );
  }
}

class TabsContainer extends React.Component {
  renderComponents() {
    let tabsComponents = [];
    for (let tab of this.props.tabs.tabs) {
      tabsComponents.push(<div key={tab.title}>{tab.component}</div>);
    }
    return tabsComponents;
  }

  render() {
    return (
      <>
        {this.props.tabs.tabHeaderComponent}
        {this.renderComponents()}
      </>
    );
  }
}

class MarketDepthWindow extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      isBackgroundEnabled: true
    };
  }

  handleBackgroundButtonClick = () => {
    this.setState({
      isBackgroundEnabled: !this.state.isBackgroundEnabled
    });
  };

  render() {
    let tabsProps = {
      tabs: [
        { title: "Bid", component: <BidOrdersTab {...this.state} /> },
        { title: "Ask", component: <AskOrdersTab {...this.state} /> }
      ],
      tabHeaderComponent: (
        <MarketDepthHeaderComponent
          onClick={this.handleBackgroundButtonClick}
          isBackgroundEnabled={this.state.isBackgroundEnabled}
        />
      )
    };
    return (
      <TabsContainer
        tabs={tabsProps}
        isBackgroundEnabled={this.state.isBackgroundEnabled}
      />
    );
  }
}

const rootElement = document.getElementById("market-depth-window");
ReactDOM.render(<MarketDepthWindow />, rootElement);

这是您的演示，您可以检查修复并确保它有效。祝你好运