如何使用 dataLoader 在 amCharts 中添加里程碑

Question

有没有办法通过数据库的数据馈送来实现新的里程碑？我检查了下面的示例，但无法弄清楚

https://www.amcharts.com/kbase/time-line-chart-date-based-milestones/

我使用 "dataLoader" 将值输入图表我可以在 table 中为里程碑创建一个新列问题是如何更新它？

Answer 1

该示例中的里程碑是 guides, so they don't normally get updated in any process that modifies the chart's dataProvider. You can use the complete callback 到 create/update 您的图表指南：

AmCharts.makeChart("chartdiv", {
  // ...
  dataLoader: {
    url: "...",
    complete: function(chart) {
      //add/modify guide objects through chart.valueAxes[0].guides or
      //directly to the chart object through chart.guides
      chart.valueAxes[0].guides = [{ 
        "value": new Date(2016, 2, 5),
        "label": "MILESTONE #1",
        "position": "top",
        "fontSize": 15,
        "tickLength": 15
      },
      // .. etc
      ];
      chart.validateData(); //redraw chart
    }
  },
  // ...
});

如何使用 dataLoader 在 amCharts 中添加里程碑

How to add milestones in amCharts using dataLoader

amcharts