JS插件amCharts实现绘制柱形图默认显示数值功能示例

时间:2021-04-02 人气:0

本文实例讲述了JS插件amCharts实现绘制柱形图默认显示数值功能。分享给大家供大家参考，具体如下：

使用amCharts.js绘制柱形图（column chart）时，有时需要默认显示每一个柱子的数值。

通过在AmCharts.AmGraph中设置labelText属性为[[value]]，即可实现上述需求。

效果如下所示：

上例的代码如下所示：

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
 <head>
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
  <title>amCharts examples</title>
  <link rel="stylesheet" href="style.css" rel="external nofollow" type="text/css">
  <script src="http://www.amcharts.com/lib/3/amcharts.js" type="text/javascript"></script>
  <script src="http://www.amcharts.com/lib/3/serial.js" type="text/javascript"></script>
  <script src="http://www.amcharts.com/lib/3/themes/light.js"></script>
  <script>
   var chart;
   var chartData = [
    {
     "country": "China",
     "visits": 2325
    },
    {
     "country": "USA",
     "visits": 1822
    },
    {
     "country": "Japan",
     "visits": 1809
    },
    {
     "country": "Germany",
     "visits": 1322
    },
    {
     "country": "UK",
     "visits": 1122
    },
    {
     "country": "France",
     "visits": 1114
    }
   ];
   AmCharts.ready(function () {
    // SERIAL CHART
    chart = new AmCharts.AmSerialChart(AmCharts.themes.light);
    chart.dataProvider = chartData;
    chart.categoryField = "country";
    chart.startDuration = 1;
    // AXES
    // category
    var categoryAxis = chart.categoryAxis;
    categoryAxis.labelRotation = 90;
    categoryAxis.gridPosition = "start";
    // value
    // in case you don't want to change default settings of value axis,
    // you don't need to create it, as one value axis is created automatically.
    // GRAPH
    var graph = new AmCharts.AmGraph();
    graph.valueField = "visits";
    graph.balloonText = "[[category]]: <b>[[value]]</b>";
    graph.type = "column";
    graph.lineAlpha = 0;
    graph.fillAlphas = 0.8;
    // display label text on each column
    graph.labelText = "[[value]]";
    chart.addGraph(graph);
    // CURSOR
    var chartCursor = new AmCharts.ChartCursor();
    chartCursor.cursorAlpha = 0;
    chartCursor.zoomable = false;
    chartCursor.categoryBalloonEnabled = false;
    chart.addChartCursor(chartCursor);
    chart.creditsPosition = "top-right";
    chart.write("chartdiv");
   });
  </script>
 </head>
 <body>
  <div id="chartdiv" style="width: 100%; height: 300px;"></div>
 </body>
</html>

希望本文所述对大家JavaScript程序设计有所帮助。

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