Question

前段时间我在这里问到如何在点击图例时隐藏谷歌图表中的线条。现在我已经找到了一个解决方案，我可以做到这一点，你可以看到它在JSFIDDLE上工作，但有一些小事情不起作用，例如：

当我点击图例时，我点击的行是隐藏的，这样很好，但图例中的样本不是灰色的，我不明白为什么因为它必须是灰色的
当我隐藏所有线条并且我想再次显示这些线条时，它们只显示在chartrangefilter上，就像你在JSFIDDLE示例中看到的那样我想要隐藏那些线条是不可能的当有人试图隐藏最后一行时，最少显示一行，否则在弹出框中发出警告。

有人可以帮助我吗？

这是我用来隐藏te行的代码，点击

google.visualization.events.addListener(chart, 'select', function () {
var sel = chart.getSelection();
// if selection length is 0, we deselected an element
if (sel.length > 0) {
            // if row is undefined, we clicked on the legend
            if (sel[0].row === null) {
                var col = sel[0].column;
                if (columns[col] == col) {
                    // hide the data series
                    columns[col] = {
                        label: data.getColumnLabel(col),
                        type: data.getColumnType(col),
                        calc: function () {
                            return null;
                        }
                    };

                    // grey out the legend entry
                    series[col - 1].color = '#CCCCCC';
                }
                else {
                    // show the data series
                    columns[col] = col;
                    series[col - 1].color = null;
                }
                var view = new google.visualization.DataView(data);
                view.setColumns(columns);
                chart.draw(view, options);
            }
        }
    });

Answer 1

尽管series对象正在正确构建，但是它永远不会在图表上更新

需要在重新绘制之前设置选项

chart.setOption('series', series);

请参阅以下工作代码段...

google.charts.load('current', {
  callback: drawVisualization,
  packages: ['corechart', 'controls','line']
});

function drawVisualization() {
  var dashboard = new google.visualization.Dashboard(
     document.getElementById('dashboard'));

  var control = new google.visualization.ControlWrapper({
   'controlType': 'ChartRangeFilter',
   'containerId': 'control',
   'options': {
     // Filter by the date axis.
     'filterColumnIndex': 0,
     'ui': {
     'chartType': 'LineChart',
     'chartOptions': {
       'chartArea': {'width': '80%'},
       'hAxis': {'baselineColor': 'none', format: "HH:mm" }
       ,'vAxis': {minValue: 0}
     }
     }
   },
   });
     var data = new google.visualization.DataTable({"cols":[{"label":"Date","type":"datetime"},{"label":"RPI1","type":"number"},{"label":"RPI2","type":"number"},{"label":"RPI3","type":"number"},{"label":"RPI4","type":"number"},{"label":"RPI5","type":"number"},{"label":"RPI6","type":"number"},{"label":"RPI7","type":"number"},{"label":"RPI8","type":"number"}],"rows":[{"c":[{"v":"Date(2017, 0, 11, 12, 51, 40)"},{"v":23},{"v":22},{"v":23},{"v":23},{"v":21},{"v":20},{"v":23},{"v":20}]},{"c":[{"v":"Date(2017, 0, 11, 12, 51, 50)"},{"v":22},{"v":22},{"v":21},{"v":21},{"v":21},{"v":20},{"v":22},{"v":20}]},{"c":[{"v":"Date(2017, 0, 11, 12, 52, 1)"},{"v":21},{"v":22},{"v":20},{"v":22},{"v":23},{"v":21},{"v":22},{"v":21}]},{"c":[{"v":"Date(2017, 0, 11, 12, 52, 11)"},{"v":23},{"v":21},{"v":22},{"v":22},{"v":20},{"v":20},{"v":23},{"v":22}]},{"c":[{"v":"Date(2017, 0, 11, 12, 52, 22)"},{"v":23},{"v":22},{"v":20},{"v":22},{"v":23},{"v":20},{"v":21},{"v":21}]},{"c":[{"v":"Date(2017, 0, 11, 12, 52, 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   var chart = new google.visualization.ChartWrapper({
   'chartType': 'LineChart',
   'containerId': 'chart',
   'options': {
     // Use the same chart area width as the control for axis alignment.
     'chartArea': {'height': '80%', 'width': '80%',interpolateNulls: true},hAxis: {
      title: 'Datetime'
    },
    vAxis: {
      title: 'Temperature (°C)',
      minValue: 0
    },
     pointSize: 3,
   }
   // Convert the first column from 'date' to 'string'.

   });
  /* Change the format of the date column, used in chart, but not chart range filter */
   dashboard.bind(control, chart);
   dashboard.draw(data);

  var columns = [];
    var series = {};
    for (var i = 0; i < data.getNumberOfColumns(); i++) {
      columns.push(i);
      if (i > 0) {
          series[i - 1] = {};
      }
    }
  google.visualization.events.addListener(chart, 'select', function () {
    var sel = dashboard.getSelection();
    // if selection length is 0, we deselected an element
    if (sel.length > 0) {
      // if row is undefined, we clicked on the legend
      if (sel[0].row === null) {
        var col = sel[0].column;
        if (columns[col] == col) {
          // hide the data series
          columns[col] = {
            label: data.getColumnLabel(col),
            type: data.getColumnType(col),
            calc: function () {
              return null;
            }
          };

          // grey out the legend entry
          series[col - 1].color = '#CCCCCC';
        }
        else {
          // show the data series
          columns[col] = col;
          series[col - 1].color = null;
        }

        // set series option
        chart.setOption('series', series);

        var view = new google.visualization.DataView(data);
        view.setColumns(columns);
        dashboard.bind(control, chart);
        dashboard.draw(view);
      }
    }
  });
}

<script src="https://www.gstatic.com/charts/loader.js"></script>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.2/jquery.min.js"></script>
<div id="dashboard">
    <div id="chart" style='width: 100%; height: 450px;'></div>
    <div id="control" style='width: 100%; height: 100px;'></div>
</div>

注意： jsapi不需要加载库

根据release notes ...

通过jsapi加载程序保留的Google Charts版本不再一致更新。从现在开始请使用新的gstatic装载机。

只需使用......

<script src="https://www.gstatic.com/charts/loader.js"></script>

这将仅将load语句更改为...

google.charts.load('current', {
  callback: drawVisualization,
  packages:['geochart']
});

（callback也可以添加到load语句中）

通过点击图例隐藏线条谷歌图表，当所有线条都隐藏时，图例不是灰色和麻烦

1 个答案: