我有一个看起来像这样的React DOM:
在MarketDepthWindow
的州,我有一个isBackgroundEnabled
,我想作为道具传递给AskOrdersTab
。但它只通过初始道具而不是更新。它应该在MarketDepthHeaderComponent
的按钮点击更新。
我认为问题在于我将它作为道具传递给TabsContainer
。
我尝试使用React.Component
将React.PureComponent
更改为shouldComponentUpdate()
,添加React.cloneElement
并通过TabsContainer
传递道具,但对我没有任何作用。
也许我犯了某种建筑错误?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")
);
TabsContainer中的状态是多余的,您应该避免在切断更新链时在每个组件中存储状态,请尝试使用props。
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。祝好运
你的问题的简单答案是你在AskOrdersTab
状态存储TabsContainer
,在你的情况下你想通过道具访问它。
说明:这导致无论何时组件更新,它正在做什么,TabsContainer
仍然会渲染原始的AskOrdersTab
(这是由于状态中的AskOrdersTab
和更新道具的当前版本是同一个对象)。使用生命周期钩子的这种行为有一些可行的解决方法,即getDerivedStateFromProps。但在这种情况下,我不会建议。
TL; DR用这个替换你的TabsContainer
它应该工作。
class TabsContainer extends React.Component {
constructor(props) {
super(props);
this.state = {
tabHeaderComponent: props.tabs.tabHeaderComponent || '',
};
}
renderComponents() {
let tabsComponents = [];
for (let tab of this.props.tabs.tabs) {
tabsComponents.push(<div>{tab.component}</div>);
}
return tabsComponents;
}
render() {
return (
<>
{this.state.tabHeaderComponent}
{this.renderComponents()}
</>
);
}
}
最后,我认为你在州里储存的太多了。尝试导入组件,或者查看两种常见的反应模式: