javascript - ReactJS:如何按顺序映射 JSON 元素并在单击时显示隐藏的 div

Question

我正在尝试从 JSON 加载项目，并在单击时切换带有描述的下拉 div。虽然我可以在静态 div 上按顺序显示元素(例如:loc1 & desc1、loc2 & desc2)，但当第二部分 (desc) 隐藏且仅显示时，我很难找到如何正确渲染它单击 loc div 时显示。

映射结果的最佳方式是什么，这样它就不会显示为 loc1 & loc2, desc1 & desc2 而是显示为 loc1 & desc1, loc2 & desc2 ？

代码:

var places = {
  library: {
    location: [
      {
        loc_name: "library1",
        "desc": "desc1 : Modern and spacious building"
      },
      {
        loc_name: "library2",
        "desc": "desc2 : A cosy small building"
      }
    ]
  }
};



function contentClass(isShow) {
  if (isShow) {
    return "content";
  }
  return "content invisible";
}

class Toggle extends React.Component {
  constructor(props) {
    super(props);
    this.state = { isShow: false };
    this.handleClick = this.handleClick.bind(this);
  }

  handleClick() {
    this.setState(function (prevState) {
      return { isShow: !prevState.isShow };
    });
  }

  render() {

    const libraries_desc = places.library.location.map((libr) =>
      <div>
        <p>{libr.desc}</p>
      </div>
    );
    const lib_names = places.library.location.map((libr) =>
      <div>
        <p>{libr.loc_name}</p>
      </div>
    );

    return (
      <div>
        <div className='control' onClick={this.handleClick}>
          <h4>{lib_names}</h4>
          <div className={contentClass(this.state.isShow)}>{libraries_desc}</div>
        </div>
      </div>
    );
  }
}



render((
  <Toggle />
), document.getElementById('root'));

当前结果:

library1
library2
desc1 : Modern and spacious building
desc 2 : A cosy small building

期望的结果:

library1
desc1 : Modern and spacious building (hidden but shown when clicked)

library2
desc 2 : A cosy small building (hidden but shown when clicked)

Codesandbox

Answer 1

我可能会尝试将位置提取到单独的组件中。通过提取它，每个位置都有责任了解其状态。在您的情况下，这意味着它的可见性(由 this.state.isShow 控制)。

具体操作方法如下:

import React from 'react';
import { render } from 'react-dom';

var places = {
  library: {
    location: [
      {
        loc_name: "library1",
        "desc": "Modern and spacious building"
      },
      {
        loc_name: "library2",
        "desc": "A cosy small building"
      }
    ]
  }
};

class Location extends React.Component {
  constructor(props) {
    super(props);
    this.state = { isShow: false };
    this.handleClick = this.handleClick.bind(this);
  }

  handleClick() {
    this.setState(function (prevState) {
      return { isShow: !prevState.isShow };
    });
  }

  contentClass(isShow) {
    if (isShow) {
      return "content";
    }
    return "content invisible";
  }

  render() {
    return (
      <div className='control' onClick={this.handleClick}>
        <h4>{this.props.desc}</h4>
        <div className={this.contentClass(this.state.isShow)}>{this.props.loc_name}</div>
      </div>
    )
  }
}

class Toggle extends React.Component {
  constructor(props) {
    super(props);
  }

  render() {
    const locations = places.library.location.map(location => {
      return <Location {...location} />
    })

    return (
      <div>
        {locations}
      </div>
    );
  }
}



render((
  <Toggle />
), document.getElementById('root'));