如何遍历对象数组并将每个对象显示在图表中？

Question

我正在尝试使用React创建一个仪表板，第一部分显示了我的本地API数据。 这是使用ComponentDidMount从前端获取的，并使用splice仅使用METRIC = SPEND。 我试图仅获取此数据的第一个对象，并使用PRODUCT和UPLIFT创建图表。 Google图表需要此类数据https://react-google-charts.com/bar-chart#basic-bar-chart-with-multiple-series

关于如何执行此操作的任何想法？ 我试图映射到数组，但是正如您在代码的最后一部分中所看到的那样，它正在数组上循环并创建3个图表，而不是将所有数据放入1个图表中。

我正在使用react-google-charts创建我的图表。

  "error": false,
  "data": [
    {
      "id": 1,
      "METRIC": "Spend",
      "PRODUCT": "Offer",
      "EXPOSED": 62717.14,
      "CONTROL": 56355.78,
      "UPLIFT": 6361.36,
      "PCT_UPLIFT": 0.11
    },
    {
      "id": 2,
      "METRIC": "Spend",
      "PRODUCT": "Brand",
      "EXPOSED": 1037739.72,
      "CONTROL": 979580.56,
      "UPLIFT": 58159.16,
      "PCT_UPLIFT": 0.06
    },
    {
      "id": 3,
      "METRIC": "Spend",
      "PRODUCT": "Aisle",
      "EXPOSED": 4084428.18,
      "CONTROL": 3880807.25,
      "UPLIFT": 203620.93,
      "PCT_UPLIFT": 0.05
    },
    {
      "id": 4,
      "METRIC": "Units",
      "PRODUCT": "Offer",
      "EXPOSED": 25117.02,
      "CONTROL": 22537.94,
      "UPLIFT": 2579.08,
      "PCT_UPLIFT": 0.11
    },
    {
      "id": 5,
      "METRIC": "Units",
      "PRODUCT": "Brand",
      "EXPOSED": 506365.64,
      "CONTROL": 479277.36,
      "UPLIFT": 27088.28,
      "PCT_UPLIFT": 0.06
    },
    {
      "id": 6,
      "METRIC": "Units",
      "PRODUCT": "Aisle",
      "EXPOSED": 1771305.29,
      "CONTROL": 1682430.67,
      "UPLIFT": 88874.62,
      "PCT_UPLIFT": 0.05
    },
    {
      "id": 7,
      "METRIC": "Visits",
      "PRODUCT": "Offer",
      "EXPOSED": 22661.99,
      "CONTROL": 20480.76,
      "UPLIFT": 2181.23,
      "PCT_UPLIFT": 0.11
    },
    {
      "id": 8,
      "METRIC": "Visits",
      "PRODUCT": "Brand",
      "EXPOSED": 413568.96,
      "CONTROL": 391852.96,
      "UPLIFT": 21716,
      "PCT_UPLIFT": 0.06
    },
    {
      "id": 9,
      "METRIC": "Visits",
      "PRODUCT": "Aisle",
      "EXPOSED": 1220181.72,
      "CONTROL": 1161775.92,
      "UPLIFT": 58405.8,
      "PCT_UPLIFT": 0.05
    },
    {
      "id": 10,
      "METRIC": "Total_custs",
      "PRODUCT": "Offer",
      "EXPOSED": 15827,
      "CONTROL": 14346.53,
      "UPLIFT": 1480.47,
      "PCT_UPLIFT": 0.1
    },
    {
      "id": 11,
      "METRIC": "Total_custs",
      "PRODUCT": "Brand",
      "EXPOSED": 301593,
      "CONTROL": 282900.38,
      "UPLIFT": 18692.62,
      "PCT_UPLIFT": 0.07
    },
    {
      "id": 12,
      "METRIC": "Total_custs",
      "PRODUCT": "Aisle",
      "EXPOSED": 795653,
      "CONTROL": 749896.76,
      "UPLIFT": 45756.24,
      "PCT_UPLIFT": 0.06
    }
  ],
  "message": "top table"
}


import React from 'react';
import { Chart } from 'react-google-charts';
import './App.css';

class App extends React.Component {
  constructor() {
    super();
    this.state = {
      top_spend: []
    }
  }
  componentDidMount() {
    fetch('http://localhost:3000/top')
      .then(response => response.json())
      .then(data => {
        this.setState({top_spend: data.data.splice(0,3)}, () => {
          console.log("Top_Spend", this.state.top_spend);
        })
      })
  }
  render() {
    let top = this.state.top_spend;

    return (
      <div className="App">
        {top.map(function(name, index) {
          return (
            <div key={index}>
              <Chart
                height={'300px'}
                width={'400px'}
                chartType="Bar"
                loader={<div>Loading Chart</div>}
                data={[
                  ['', 'UPLIFT', 'PCT_UPLIFT'],
                  [name.PRODUCT, name.UPLIFT, name.PCT_UPLIFT],
                ]}
                options={{
                  chart: {
                    title: 'Company',
                  },
                  chartArea: {width: '50%'},
                  isStacked: true,
                }}
              />
            </div>
          )
        })}
      </div>
    );
  }
}

export default App;

Answer 1

因此，这里的问题是您要遍历data ，从而在我理解正确的情况下想要将所有内容合并到一个图表中时为每个条目创建一个图表。 因此，与其直接遍历数据，不如遍历传递给Chart的prop中的数据。 所以代码看起来像这样

<Chart
  data={[
    ['', 'UPLIFT', 'PCT_UPLIFT'],
    ...data.map(d => [ d.PRODUCT, d.UPLIFT, d.PCT_UPLIFT ])
  ]}
/>