如何循环遍历jsx react中的嵌套对象

Question

我正在使用 react 我想在 UI 上显示一些动态内容但由于我是新手而无法循环数据所以发现这很难做到

 state={
dashboardManpowerCount:{
        "CurrentMonth": {
          "Total No of employes": 25,
          "Ariving": 10,
          "Exited": 8
        },
        "PreviousMonth": {
          "Total No of employes": 25,
          "Ariving": 10,
          "Exited": 8
        }
      }
           }

class currAndprevMonthcCounts extends Component {
render(){
const {dashboardManpowerCount} = this.state

return(
<div>
<div className="col-6 col-sm-6 col-md-6 col-lg-3 col-xl-3">
                    <div className="row">
                       <div className="col-12 col-sm-12 col-md-6 col-lg-5 col-xl-5">
                       <h6>Previous Month</h6>
                    <h2>395</h2> 
                    </div>
                    <div className="col-12 col-sm-12 col-md-6 col-lg-7 col-xl-7">

                    <span className="badge badge-pill badge-secondary mt-2"
                    >+7 Ariving</span>
                    <br></br>

                    <span className="badge badge-pill badge-secondary mt-3">-3 Exiting</span> 

                    </div>
                </div>
                </div>
                <div className="col-6 col-sm-6 col-md-6 col-lg-3 col-xl-3">
                <div className="row">
                       <div className="col-12 col-sm-12 col-md-6 col-lg-5 col-xl-5">
                    <h6>Previous Month</h6>
                    <h2>395</h2>
                    </div>
                    <div className="col-12 col-sm-12 col-md-6 col-lg-7 col-xl-7">

                    <span className="badge badge-pill badge-secondary mt-2">+5 Ariving</span>
                    <br></br>

                    <span className="badge badge-pill badge-secondary mt-3">-3 Exiting</span> 

                    </div>
                </div>
                </div>
</div>
)
}

}

有两个选项当前月份数据和上个月数据我想遍历对象并在我的 jsx 中呈现静态内容

就是这样

编辑/更新

我想我在这里遗漏了一些关于 UI 静态数据的工作示例这就是我想要得到的

Answer 1

使用object.keys或object.entries循环遍历对象的属性。

  render() {
    const { dashboardManpowerCount } = this.state;
    const dashboardManpowerCountArray = Object.entries(dashboardManpowerCount);

    return (
      <div>
        {dashboardManpowerCountArray.map(arr => {
          return (
            <div key={arr[0]}>
              <h3>{arr[0]}</h3>
              {Object.entries(arr[1]).map(monthArr => {
                return (
                  <span key={monthArr[0]} style={{ display: "block" }}>{`${
                    monthArr[0]
                  } ${monthArr[1]}`}</span>
                );
              })}
            </div>
          );
        })}
      </div>
    );
  }

看到这个堆栈闪电战。 显然，您可以根据自己的喜好更改样式和标签。

更新

这是您可以用来显示数据的 jsx-

import React from "react";
import { render } from "react-dom";
import "bootstrap/dist/css/bootstrap.min.css";

class Events extends React.Component {
  state = {
    dashboardManpowerCount: {
      CurrentMonth: {
        "Total No of employes": 25,
        Ariving: 10,
        Exited: 8
      },
      PreviousMonth: {
        "Total No of employes": 25,
        Ariving: 10,
        Exited: 8
      }
    }
  };
  render() {
    return (
      <div className="divParent row container">
        {Object.entries(this.state.dashboardManpowerCount).map(
          ([monthName, monthData]) => {
            return (
              <div className="col-6 col-sm-6 col-md-6 col-lg-3 col-xl-3">
                <div className="row">
                  <div className="col-12 col-sm-12 col-md-6 col-lg-5 col-xl-5">
                    <h6>{monthName}</h6>
                    <h2>{monthData["Total No of employes"]}</h2>
                  </div>
                  <div className="col-12 col-sm-12 col-md-6 col-lg-7 col-xl-7">
                    <span className="badge badge-pill badge-secondary mt-2">
                      {`+${monthData.Ariving} Ariving`}
                    </span>
                    <br />
                    <span className="badge badge-pill badge-secondary mt-3">
                      {`-${monthData.Ariving} Exiting`}
                    </span>
                  </div>
                </div>
              </div>
            );
          }
        )}
      </div>
    );
  }
}

render(<Events />, document.getElementById("root"));

但这一次组件不是完全动态的。 如果将来您的对象的架构发生变化，您也必须更改 jsx。