如何在使用amCharts执行事件侦听器clickGraphItem时引用JavaScript对象数组中的变量

Question

我目前有一个名为chartData的JavaScript对象数组，以国家和访问量为变量。我利用amCharts将数据绘制在柱状图中，并使用事件处理程序触发国家/地区(event.item.category(和访问(event.item.values.value(的警报消息，具体取决于单击的列，并且一切正常(请参阅下面的handleClick函数(。根据下面的代码，我在chartDataJavaScript对象中添加了一个名为id的额外变量。如何在handleClick事件函数中访问我的新变量id。

amCharts JavaScript代码

<script src="http://www.amcharts.com/lib/amcharts.js" type="text/javascript"></script>
<div id="chartdiv" style="width: 100%; height: 440px; background-color:#eeeeee;"></div>
var chart;
var chartData = 
[{
country: "USA",
visits: 4025,
id: 1},
{
country: "China",
visits: 1882,
id: 2},
{
country: "Japan",
visits: 1809,
id: 3},
{
country: "Germany",
visits: 1322,
id: 4},
{
country: "UK",
visits: 1122,
id: 5}];

function handleClick(event)
{
alert(event.item.category + ": " + event.item.values.value);
}

AmCharts.ready(function() {
// SERIAL CHART
chart = new AmCharts.AmSerialChart();
chart.dataProvider = chartData;
chart.categoryField = "country";
chart.startDuration = 1;

// add click listener
chart.addListener("clickGraphItem", handleClick);

var categoryAxis = chart.categoryAxis;
categoryAxis.labelRotation = 90;
categoryAxis.gridPosition = "start";

var graph = new AmCharts.AmGraph();
graph.valueField = "visits";
graph.balloonText = "[[category]]: [[value]]";
graph.type = "column";
graph.lineAlpha = 0;
graph.fillAlphas = 0.8;
chart.addGraph(graph);
chart.write("chartdiv");
});

Js出价http://jsfiddle.net/amcharts2/cV8GG/

Answer 1

您可以在event.item.dataContext中看到id

function handleClick(event)
{
console.log(event.item.dataContext.id);
alert(event.item.category + ": " + event.item.values.value);
}