如何在点击Google图表图例中的系列后禁用显示的辅助线？

Question

如果您查看this line chart并点击图例中的狗，您会发现图表中相应系列旁边会显示辅助线。

如何防止此行出现？我知道我可以通过这样做删除所有交互性：

var options = {
    enableInteractivity: false
};

但是，这也会抑制工具提示。我只想删除图例中的交互性。

Answer 1

您可以在'select'事件上覆盖图表的选择，
如果选择row为空，则选择图例...

请参阅以下工作片段，
选择图例后，将删除选择...

google.charts.load('current', {
  packages: ['corechart']
}).then(function () {
  var data = new google.visualization.DataTable();
  data.addColumn('number', 'X');
  data.addColumn('number', 'Dogs');
  data.addColumn('number', 'Cats');
  data.addRows([
    [0, 0, 0],    [1, 10, 5],   [2, 23, 15],  [3, 17, 9],   [4, 18, 10],  [5, 9, 5],
    [6, 11, 3],   [7, 27, 19],  [8, 33, 25],  [9, 40, 32],  [10, 32, 24], [11, 35, 27],
    [12, 30, 22], [13, 40, 32], [14, 42, 34], [15, 47, 39], [16, 44, 36], [17, 48, 40],
    [18, 52, 44], [19, 54, 46], [20, 42, 34], [21, 55, 47], [22, 56, 48], [23, 57, 49],
    [24, 60, 52], [25, 50, 42], [26, 52, 44], [27, 51, 43], [28, 49, 41], [29, 53, 45],
    [30, 55, 47], [31, 60, 52], [32, 61, 53], [33, 59, 51], [34, 62, 54], [35, 65, 57],
    [36, 62, 54], [37, 58, 50], [38, 55, 47], [39, 61, 53], [40, 64, 56], [41, 65, 57],
    [42, 63, 55], [43, 66, 58], [44, 67, 59], [45, 69, 61], [46, 69, 61], [47, 70, 62],
    [48, 72, 64], [49, 68, 60], [50, 66, 58], [51, 65, 57], [52, 67, 59], [53, 70, 62],
    [54, 71, 63], [55, 72, 64], [56, 73, 65], [57, 75, 67], [58, 70, 62], [59, 68, 60],
    [60, 64, 56], [61, 60, 52], [62, 65, 57], [63, 67, 59], [64, 68, 60], [65, 69, 61],
    [66, 70, 62], [67, 72, 64], [68, 75, 67], [69, 80, 72]
  ]);

  var options = {
    hAxis: {
      title: 'Time'
    },
    vAxis: {
      title: 'Popularity'
    },
    series: {
      1: {curveType: 'function'}
    }
  };

  var chart = new google.visualization.LineChart(document.getElementById('chart_div'));

  google.visualization.events.addListener(chart, 'select', function () {
    var selection = chart.getSelection();
    if (selection.length > 0) {
      if (selection[0].row === null) {
        chart.setSelection([]);
      }
    }
  });

  chart.draw(data, options);
});

<script type="text/javascript" src="https://www.gstatic.com/charts/loader.js"></script>
<div id="chart_div"></div>