How to display a single data point on Google Area OR Line chart

there is a bug with the most recent version of google charts,
when the x-axis is a continuous axis (date, number, not string, etc.),
and only one row exists in the data table,
you must set an explicit view window on the axis --> hAxis.viewWindow

to use a date type with only one row,
first, use data table method --> getColumnRange
this will return an object with min & max properties for the x-axis

then we can increase the max and decrease the min by one day,
and use that for our view window.

see following working snippet... 

google.charts.load('current', {
  packages: ['corechart']
}).then(function () {
  var data = google.visualization.arrayToDataTable([
    ['Updated', 'Amount'],
    [new Date(1548266417060.704),100]
  ]);

  var oneDay = (24 * 60 * 60 * 1000);
  var dateRange = data.getColumnRange(0);
  if (data.getNumberOfRows() === 1) {
    dateRange.min = new Date(dateRange.min.getTime() - oneDay);
    dateRange.max = new Date(dateRange.max.getTime() + oneDay);
  }

  var options = {
    title: 'Company Performance',
    hAxis: {
      title: 'Year',
      titleTextStyle: {color: '#333'},
      viewWindow: dateRange
    },
    pointSize: 5
  };

  var chart = new google.visualization.AreaChart(document.getElementById('chart_div'));
  chart.draw(data, options);
});
<script src="https://www.gstatic.com/charts/loader.js"></script>
<div id="chart_div"></div>

you'll notice if we go back to an old version ('45'),
a single date row displays without issue... 

google.charts.load('45', {
  packages: ['corechart']
}).then(function () {
  var data = google.visualization.arrayToDataTable([
    ['Updated', 'Amount'],
    [new Date(1548266417060.704),100]
  ]);

  var options = {
    title: 'Company Performance',
    hAxis: {
      title: 'Year',
      titleTextStyle: {color: '#333'},
    },
    pointSize: 5
  };

  var chart = new google.visualization.AreaChart(document.getElementById('chart_div'));
  chart.draw(data, options);
});
<script src="https://www.gstatic.com/charts/loader.js"></script>
<div id="chart_div"></div>

Tags:

Javascript

Google Visualization

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