处理react-chartjs-2中的零值

Question

我正在使用react-chartjs-2来定制三个甜甜圈饼图。这个库有很多功能，但我在这里遇到了问题。我不知道如何处理零值。当我的所有值都为零时，不会绘制饼图，这是正确的。任何关于如何处理零值的想法？这是我绘制圆环饼图的代码：

const renderPortfolioSectorPie = (sectors, intl) => {
  if (sectors.length > 0) {
    const sectorsName = sectors
      .map(sector => sector.name);
    const sectorsValue = sectors
      .map(sector => sector.subtotal);
    const sectorsPercentage = sectors
      .map(sector => sector.percentage);
    const customeSectorsPercentage = sectorsPercentage.map(h =>
      `(${h})`
    );
    let sectorsCounter = 0;
    for (let i = 0; i < sectorsName.length; i += 1) {
      if (sectorsName[i] !== sectorsName[i + 1]) {
        sectorsCounter += 1;
      }
    }
    const sectorsData = {
      datasets: [{
        data: sectorsValue,
        backgroundColor: [
          '#129CFF',
          '#0c6db3',
          '#4682B4',
          '#00FFFF',
          '#0099FF',
          '#3E3BF5',
          '#3366CC',
          '#3399FF',
          '#6600FF',
          '#3366CC',
          '#0099CC',
          '#336699',
          '#3333FF',
          '#2178BA',
          '#1F7AB8',
          '#1C7DB5'
        ],
        hoverBackgroundColor: [
          '#129cff',
          '#0c6db3',
          '#4682B4',
          '#00FFFF',
          '#0099FF',
          '#3E3BF5',
          '#3366CC',
          '#3399FF',
          '#3366CC',
          '#0099CC',
          '#336699',
          '#3333FF',
          '#2178BA',
          '#1F7AB8',
          '#1C7DB5'
        ],
        titles: sectorsName,
        labels: sectorsValue,
        afterLabels: customeSectorsPercentage,
      }]
    };

    return (
      <Doughnut
        data={sectorsData}
        width={250}
        height={250}
        redraw
        options={{
          legend: {
            display: false
          },
          maintainAspectRatio: true,
          responsive: true,
          cutoutPercentage: 80,
          animation: {
            animateRotate: false,
            animateScale: false
          },
          elements: {
            center: {
              textNumber: `${sectorsCounter}`,
              text: intl.formatMessage({ id: 'pie.sectors' }),
              fontColor: '#4a4a4a',
              fontFamily: "'EurobankSans'",
              fontStyle: 'normal',
              minFontSize: 25,
              maxFontSize: 25,
            }
          },
          /*eslint-disable */
          tooltips: {
            custom: (tooltip) => {
              tooltip.titleFontFamily = 'Helvetica';
              tooltip.titleFontColor = 'rgb(0,255,255)';
            },
            /* eslint-enable */
            callbacks: {
              title: (tooltipItem, data) => {
                const titles = data.datasets[tooltipItem[0]
                  .datasetIndex].titles[tooltipItem[0].index];
                return (
                  titles
                );
              },
              label: (tooltipItem, data) => {
                const labels = data.datasets[tooltipItem.datasetIndex]
                  .labels[tooltipItem.index];
                return (
                  labels
                );
              },
              afterLabel: (tooltipItem, data) => {
                const afterLabels = data.datasets[tooltipItem.datasetIndex]
                  .afterLabels[tooltipItem.index];
                return (
                  afterLabels
                );
              },
            },
          },
        }}
      />
    );
  }

Answer 1

我想做同样的事情，但我找不到办法做到这一点。所以，这就是我找到的解决方法：

获取数据后，您可以更新选项：

this.setState({
    doughnutOptions: {
        tooltips: {
            callbacks: {
                label: function () {
                    let value = response.data.total;
                    let label = response.data.name;

                    return value === 0 ? label : label + ': ' + value;
                }
            }
        }
    }
});

我的甜甜圈看起来像那样：

<Doughnut data={this.state.myData} min-width={200} width={400}
          height={400} options={this.state.doughnutOptions}/>

最初，doughnutOpitions只是状态中定义的一个空对象：

doughnutOptions: {}

这就是没有数据时的样子：

如果您找到了更好的无数据显示方式，请分享。如果没有，我希望解决方法对您来说足够好！