Highcharts xAxis 标签格式化程序回调数据为空

Question

我是 Highcharts 新手，需要使用 xAxis.labels.formatter 函数来生成标签。问题是当格式化程序函数运行时，数据是空的。如果我单击图例，则会加载数据并正确创建标签。我尝试使用 charts.events.load 来调用 labelFormatter 函数，但仍然没有运气。我基本上需要在加载系列数据并渲染图表后生成标签。

    chart: {
        type: 'line',
        backgroundColor: '#eee',
        events: {
            load: function () {
                console.log(this);
                this.xAxis[0].labelFormatter();
            }
        }
    },
    xAxis: {
        categories: [],
        labels: {
          formatter: formatVehicleConversionLabels,
          useHTML: true
        }
    },
    ...

  function formatVehicleConversionLabels() {
    //console.log(this);
    var month = this.value;
    var totalConnectedVehiclesValue = null;
    var notificationsValue = null;
    var downloadsValue = null;
    var installationsValue = null;
    for(var i = 0; i < this.chart.series.length; i++) {
      var currentSeries = this.chart.series[i];
      if(currentSeries.name === "Total Connected Vehicles") {
        if(currentSeries.data.length > 0) {
          for(var j = 0; j < currentSeries.data.length; j++) {
            var currentData = currentSeries.data[j];
            if(currentData.category === month) {
              totalConnectedVehiclesValue = currentData.y;
            }
          }
        }
      }
      if(currentSeries.name === "Notifications") {
        if(currentSeries.data.length > 0) {
          for(var j = 0; j < currentSeries.data.length; j++) {
            var currentData = currentSeries.data[j];
            if(currentData.category === month) {
              notificationsValue = currentData.y;
            }
          }
        }
      }
      if(currentSeries.name === "Downloads") {
        if(currentSeries.data.length > 0) {
          for(var j = 0; j < currentSeries.data.length; j++) {
            var currentData = currentSeries.data[j];
            if(currentData.category === month) {
              downloadsValue = currentData.y;
            }
          }
        }
      }
      if(currentSeries.name === "Installations") {
        if(currentSeries.data.length > 0) {
          for(var j = 0; j < currentSeries.data.length; j++) {
            var currentData = currentSeries.data[j];
            if(currentData.category === month) {
              installationsValue = currentData.y;
            }
          }
        }
      }
    }
    return '<table class="x-axis"><tr><th>' + this.value + '</th></tr>' +
    '<tr><td>' + totalConnectedVehiclesValue + '</td></tr>' +
    '<tr><td>' + notificationsValue + '</td></tr>' +
    '<tr><td>' + downloadsValue + '</td></tr>' +
    '<tr><td>' + installationsValue + '</td></tr></table';
  }

// 修复

已通过将数组添加到选项属性并将其用作标签格式化程序函数的数据来解决此问题。

options:{
  labelData: [],
  ...
  angular.forEach(vm.downloadAndInstallationRateChartConfig.options.xAxis.categories, function(d, i) {
        vm.downloadAndInstallationRateChartConfig.options.labelData.push({
          col: d,
          successfulDownloads: successfulDownloadsData[i],
          successfulInstallations: successfulInstallationsData[i]
        });
      });

      function formatDownloadAndInstallationRateLabels() {
        var labelData = null;
        for(var i = 0; i < this.chart.options.labelData.length; i++) {
          if(this.chart.options.labelData[i].col === this.value) {
            labelData = this.chart.options.labelData[i];
          }
        }
        return '<span style="margin-bottom: 20px; display: inline-block; font-size: 12px;">'+this.value+'</span><br />'+
        '<span style="margin-top: 1px; display: inline-block; font-size: 12px;">'+labelData.successfulDownloads+'</span><br />'+
        '<span style="margin-top: 1px; display: inline-block; font-size: 12px;">'+labelData.successfulInstallations+'</span>';
      }

Answer 1

解决方法是将标签数据的数组添加到选项属性，见上文。