javascript - 谷歌图表传递分段值

Question

我试图弄清楚如何通过 javascript 从谷歌 donut chart 表中的段传递值。继此example ( donut )，我修改了 html，如下所示: onmouseover="segmentMouseOver(event)"传递 onMouseOver 事件。虽然，我找不到一种方法来传递鼠标悬停在 donut 上的段的值。

欢迎任何帮助!

Answer 1

// Instantiate and draw our chart, passing in some options.
var chart = new google.visualization.PieChart(document.getElementById('donutchart'));    

function selectHandler() {
  var selectedItem = chart.getSelection()[0];
  if (selectedItem) {
    var topping = data.getValue(selectedItem.row, 0);
    alert('The user selected ' + topping);
  }
}

google.visualization.events.addListener(chart, 'select', selectHandler); 
chart.draw(data, options);

您可以了解更多here .