React.js:组合组件以创建选项卡 [英] React.js: Composing components to create tabs

问题描述

我正在尝试制作一个标签组件.TabsSwitcher 和 TabsPanel 必须是单独的组件，以便它们可以在 DOM 中的任何地方使用，例如TabsSwitcher 后面不一定要跟 TabsPanel.

为了让它工作，我需要以某种方式连接这些组件.此外，TabsSwitcher 必须能够告诉 TabsPanel 何时单击了选项卡.

/** @jsx React.DOM */var TabsExample = React.createClass({渲染:函数(){变量标签 = [{标题:'第一'，内容:'内容1'}，{标题:'第二'，内容:'内容2'}];返回 
<TabsSwitcher items={tabs}/><TabsContent items={tabs}/></div>;}});var TabsSwitcher = React.createClass({渲染:函数(){var items = this.props.items.map(function(item) {return <a onClick={this.onClick}>{item.title}</a>;}.bind(this));返回 <div>{items}</div>;},点击:函数(e){//通知 TabsContent 点击}});var TabsContent = React.createClass({渲染:函数(){var items = this.props.items.map(function(item) {返回 <div>{item.content}</div>;});返回 <div>{items}</div>;}});React.renderComponent(<TabsExample/>,文档.body);

最好的方法是什么?

<小时>

解决方案:http://jsfiddle.net/NV/5YRG9/

解决方案

React 文档在组件间通信" 和 "多个组件".要点是父母应该将一个函数作为道具传递给孩子，孩子应该在需要时将该函数作为回调调用:

var TabsExample = React.createClass({handleTabClick:功能(项目){//对项目做一些事情，也许将其设置为活动.},渲染:函数(){变量标签 = [{标题:'第一'，内容:'内容1'}，{标题:'第二'，内容:'内容2'}];返回 
<TabsSwitcher items={tabs} onTabClick={this.handleTabClick}/><TabsContent items={tabs}/></div>;}});var TabsSwitcher = React.createClass({渲染:函数(){var items = this.props.items.map(function(item) {return <a onClick={this.onClick.bind(this, item)}>{item.title}</a>;}.bind(this));返回 <div>{items}</div>;},onClick:功能(项目){this.props.onTabClick(item);}});

对于 TabsContent 组件，您应该将 tabs 移动到 TabsExample 状态，以便 React 可以在它们更改时自动为您重新渲染.由于 TabsSwitcher 和 TabsContent 在 render 方法中传递了选项卡，React 知道它们依赖于选项卡，并且会在状态更改时重新渲染:

var TabsExample = React.createClass({获取初始状态:函数(){返回 {activeTabId: 1,标签:[{title: 'first', content: '内容 1', id: 1},{标题:'第二'，内容:'内容2'，id:2}]};};handleTabClick:功能(项目){//调用 `setState` 以便 React 知道更新的选项卡项.this.setState({activeTabId: item.id});},渲染:函数(){返回 (
<TabsSwitcher 项目={this.state.tabs}activeItemId={this.state.activeTabId}onTabClick={this.handleTabClick}/><TabsContent 项={this.state.tabs}activeItemId={this.state.activeTabId}/></div>);}});

I’m trying to make a tabs component. TabsSwitcher and TabsPanel must be separate components so they could be used anywhere in DOM, e.g. TabsSwitcher doesn’t have to be followed by TabsPanel.

To make it work, I need to somehow connect these components. Furthermore, TabsSwitcher must be able to tell TabsPanel when a tab was clicked.

/** @jsx React.DOM */

var TabsExample = React.createClass({
    render: function() {
        var tabs = [
            {title: 'first', content: 'Content 1'},
            {title: 'second', content: 'Content 2'}
        ];
        return <div>
            <TabsSwitcher items={tabs}/>
            <TabsContent items={tabs}/>
        </div>;
    }
});

var TabsSwitcher = React.createClass({
    render: function() {
        var items = this.props.items.map(function(item) {
            return <a onClick={this.onClick}>{item.title}</a>;
        }.bind(this));
        return <div>{items}</div>;
    },
    onClick: function(e) {
        // notify TabsContent about the click
    }
});

var TabsContent = React.createClass({
    render: function() {
        var items = this.props.items.map(function(item) {
            return <div>{item.content}</div>;
        });
        return <div>{items}</div>;
    }
});

React.renderComponent(
    <TabsExample/>,
    document.body
);

What’s the best way to do it?

---

Solution: http://jsfiddle.net/NV/5YRG9/

解决方案

The React docs cover this in detail in "Communicate Between Components" and "Multiple Components". The gist is that the parent should pass a function as a prop to the child, and the child should call that function as a callback when it needs to:

var TabsExample = React.createClass({
    handleTabClick: function(item) {
        // Do something with item, maybe set it as active.
    },
    render: function() {
        var tabs = [
            {title: 'first', content: 'Content 1'},
            {title: 'second', content: 'Content 2'}
        ];
        return <div>
            <TabsSwitcher items={tabs} onTabClick={this.handleTabClick}/>
            <TabsContent items={tabs}/>
        </div>;
    }
});

var TabsSwitcher = React.createClass({
    render: function() {
        var items = this.props.items.map(function(item) {
            return <a onClick={this.onClick.bind(this, item)}>{item.title}</a>;
        }.bind(this));
        return <div>{items}</div>;
    },
    onClick: function(item) {
        this.props.onTabClick(item);
    }
});

For the TabsContent component, you should move the tabs into the TabsExample state so React can automatically re-render for you when they change. Since TabsSwitcher and TabsContent are passed the tabs in the render method, React knows they are dependent on the tabs and will re-render when the state changes:

var TabsExample = React.createClass({
    getInitialState: function() {
        return {
            activeTabId: 1,
            tabs: [
                {title: 'first', content: 'Content 1', id: 1},
                {title: 'second', content: 'Content 2', id: 2}
            ]
        };
    };
    handleTabClick: function(item) {
        // Call `setState` so React knows about the updated tab item.
        this.setState({activeTabId: item.id});
    },
    render: function() {
        return (
            <div>
                <TabsSwitcher items={this.state.tabs}
                              activeItemId={this.state.activeTabId}
                              onTabClick={this.handleTabClick}/>
                <TabsContent items={this.state.tabs}
                             activeItemId={this.state.activeTabId}/>
            </div>
        );
    }
});

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