Google Visualisation Line Chart - Multiple Lines

问题

I have a line chart, h-axis is date, v-axis is double. I need to display two lines:

lineA: [
    [2016-1-1 00:00, 1.1]
    [2016-2-1 00:00, 1.1]
    [2016-3-1 00:00, 1.1]
]
lineB: [
    [2016-1-1 00:00, 2.1]
    [2016-2-1 08:00, 2.1]
    [2016-3-1 00:00, 2.1]
]

To display the data on the chart, I need to combine these two lines and pass the result to arrayToDataTable.

combine: [
    [2016-1-1 00:00, 1.1, 2.1],
    [2016-2-1 00:00, 1.1, null],
    [2016-2-1 08:00, null, 2.1],
    [2016-3-1 00:00, 1.1, 2.1],
]

As a result of the above, I am getting gaps on the lines. How can I solve this issue? Is it possible to pass two individual sets, one for each line? All the examples I have found require them to be merged as the combine table.

I need to keep the nulls when provided as part of line1 and line2 table

回答1:

use the following option to fill in gaps created by null values

interpolateNulls: true

EDIT

see following working snippet...

google.charts.load('current', {
  callback: function () {
    var data = google.visualization.arrayToDataTable([
      [new Date(2016, 0, 1), 1.1, 2.1],
      [new Date(2016, 1, 1), 1.1, null],
      [new Date(2016, 1, 1, 8), null, 2.1],
      [new Date(2016, 2, 1), 1.1, 2.1]
    ], true);

    var options = {
      interpolateNulls: true
    };

    var container = document.body.appendChild(document.createElement('div'));
    var chart = new google.visualization.LineChart(container);
    chart.draw(data, options);
  },
  packages: ['corechart']
});

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

回答2:

google.charts.load('current', {
  callback: function () {
    var data = google.visualization.arrayToDataTable([
      [new Date(2016, 0, 1), 1.1, 2.1],
      [new Date(2016, 1, 1), 1.1, null],
      [new Date(2016, 1, 1, 8), null, 2.1],
      [new Date(2016, 2, 1), 1.1, 2.1]
    ], true);

    var options = {
      interpolateNulls: true
    };

    var container = document.body.appendChild(document.createElement('div'));
    var chart = new google.visualization.LineChart(container);
    chart.draw(data, options);
  },
  packages: ['corechart']
});

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

来源：https://stackoverflow.com/questions/41767578/google-visualisation-line-chart-multiple-lines

标签

javascript

charts

google-visualization

linechart