获取谷歌图表中柱形图的工具提示数据

时间:2013-12-11 13:28:43

标签: javascript charts google-visualization

我正在使用以下代码使用Google可视化API绘制柱形图。

<html>
<head>
    <script type="text/javascript" src="https://www.google.com/jsapi"></script>
    <script type="text/javascript">
        google.load("visualization", "1", {packages: ["corechart"]});
        google.setOnLoadCallback(drawChart);
        function drawChart() {
            var data = google.visualization.arrayToDataTable([
                ['Year', 'Expenses'],
                ['2004', 400],
                ['2005', 460],
                ['2006', 1120],
                ['2007', 540]
            ]);

            var options = {
                hAxis: {title: 'Year', titleTextStyle: {color: 'red'}}
            };

            var chart = new google.visualization.ColumnChart(document.getElementById('chart_div'));
            chart.draw(data, options);
        }
    </script>
</head>
<body>
    <div id="chart_div" style="width: 900px; height: 500px;"></div>
</body>
</html>

当我点击其中一个栏时,它会在工具提示中显示x和y轴的数据。我希望工具提示(2006和460)中显示的数据为警报。如何找到它。

enter image description here

1 个答案:

答案 0 :(得分:2)

使用“select”事件处理程序,并根据所选元素从DataTable中获取数据:

google.visaulization.events.addListener(chart, 'select', function () {
    var selection = chart.getSelection();
    if (selection.length) {
        alert(data.getValue(selection[0].row, 0) + ' ' + data.getValue(selection[0].row, selection[0].column));
    }
});