使用多个缺失值绘制Google折线图

Question

我从Google Line Chart参考中复制了此代码并进行了一些小的更改:

function drawChart() {

    var data = new google.visualization.DataTable();
    data.addColumn('number', 'Dag');
    data.addColumn('number', 'Målvikt');
    data.addColumn('number', 'Uppmätt vikt');


    data.addRows([
      [1, 37.8, 55.0],
      [2, null, 69.5],
      [3, null, 57],
      [4, null, 18.8],
      [5, null, 17.6],
      [6, null, 13.6],
      [7, null, 12.3],
      [8, null, 29.2],
      [9, null, 42.9],
      [10, null, 30.9],
      [11, null, 7.9],
      [12, null, 8.4],
      [13, null, 6.3],
      [14, 30.8, 6.2]
    ]);

    var options = {
        chart: {
            title: 'Box Office Earnings in First Two Weeks of Opening',
            subtitle: 'in millions of dollars (USD)',
            interpolateNulls: true
        },
        width: 900,
        height: 500
    };

    var chart = new google.charts.Line(document.getElementById('linechart_material'));

    chart.draw(data, options);
}

我的第一行根本没有生成.如您所见,我想给出名为"Målvikt"的曲线的第一个和最后一个值,并在它们之间画一条直线.我找到了这个相关的问题并添加interpolateNulls: true 但实际上并没有解决我的问题.然后我将所有空值更改为除了一个值到某个值,但是它的邻居之间仍然没有行.我究竟做错了什么？

Answer 1

看来该google.charts.Line组件不支持interpolateNulls选项.

其次,指定interpolateNulls选项时会出现拼写错误.

由于interpolateNulls属性chart根据" 配置选项"不属于属性,因此行:

var options = {
    chart: {
        interpolateNulls: true
    }
};

应替换为:

var options = {
    interpolateNulls: true
}; 

话虽如此,我会建议利用google.visualization.LineChart从corechart包装,而不是google.charts.Line从组件line包.在这种情况下,interpolateNulls可以应用选项,如下所示:

工作实例

google.load('visualization', '1.1', { packages: ['corechart'] });
google.setOnLoadCallback(drawChart);


function drawChart() {

    var data = new google.visualization.DataTable();
    data.addColumn('number', 'Dag');
    data.addColumn('number', 'Målvikt');
    data.addColumn('number', 'Uppmätt vikt');


    data.addRows([
     [1, 37.8, 55.0],
     [2, null, 69.5],
     [3, null, 57],
     [4, null, 18.8],
     [5, null, 17.6],
     [6, null, 13.6],
     [7, null, 12.3],
     [8, null, 29.2],
     [9, null, 42.9],
     [10, null, 30.9],
     [11, null, 7.9],
     [12, null, 8.4],
     [13, null, 6.3],
     [14, 30.8, 6.2]
    ]);

    var options = {
        title: 'Box Office Earnings in First Two Weeks of Opening',
        subtitle: 'in millions of dollars (USD)',
        interpolateNulls: true,
        width: 900,
        height: 500
    };

    //var chart = new google.charts.Line(document.getElementById('linechart_material'));
    var chart = new google.visualization.LineChart(document.getElementById('linechart_material'));


    chart.draw(data, options);
}

<script type="text/javascript" src="https://www.google.com/jsapi"></script>
<div id="linechart_material" style="width: 640px; height: 480px"></div>