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No-gap Date Axis

It’s a common scenario, especially in financial data, that you have non-continuous data – there are gaps at night or on weekends or holidays. And it is a widespread practice that these gaps are not displayed on the axis, showing only the dates that have data. For this purpose, we created a GaplessDateAxis class, which addresses this use-case. Just replace your DateAxis with this class and that’s it – no more gaps in your chart.

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Demo source

<!-- Styles -->
<style>
#chartdiv {
  width: 100%;
  height: 500px;
max-width: 100%
}
</style>

<!-- Resources -->
<script src="https://cdn.amcharts.com/lib/5/index.js"></script>
<script src="https://cdn.amcharts.com/lib/5/xy.js"></script>
<script src="https://cdn.amcharts.com/lib/5/themes/Animated.js"></script>

<!-- Chart code -->
<script>
am5.ready(function() {


// Create root element
// https://www.amcharts.com/docs/v5/getting-started/#Root_element
var root = am5.Root.new("chartdiv");


// Set themes
// https://www.amcharts.com/docs/v5/concepts/themes/
root.setThemes([
  am5themes_Animated.new(root)
]);


// Create chart
// https://www.amcharts.com/docs/v5/charts/xy-chart/
var chart = root.container.children.push(am5xy.XYChart.new(root, {
  panX: true,
  panY: true,
  wheelX: "panX",
  wheelY: "zoomX",
  pinchZoomX: true,
  paddingLeft: 0
}));


// Add cursor
// https://www.amcharts.com/docs/v5/charts/xy-chart/cursor/
var cursor = chart.set("cursor", am5xy.XYCursor.new(root, {
  behavior: "none"
}));
cursor.lineY.set("visible", false);


// Generate random data
var date = new Date();
date.setHours(0, 0, 0, 0);
var value = 1000;
var volume = 100000;

function generateData() {
  value = Math.round((Math.random() * 10 - 5) + value);
  volume = Math.round((Math.random() * 1000 - 500) + volume);

  am5.time.add(date, "day", 1);
  // add another if it's saturday
  if (date.getDay() == 6) {
    am5.time.add(date, "day", 1);
  }
  // add another if it's sunday
  if (date.getDay() == 0) {
    am5.time.add(date, "day", 1);
  }

  return {
    date: date.getTime(),
    value: value,
    volume: volume
  };
}

function generateDatas(count) {
  var data = [];
  for (var i = 0; i < count; ++i) {
    data.push(generateData());
  }
  return data;
}


// Create axes
// https://www.amcharts.com/docs/v5/charts/xy-chart/axes/
var xAxis = chart.xAxes.push(am5xy.GaplessDateAxis.new(root, {
  maxDeviation: 0,
  baseInterval: {
    timeUnit: "day",
    count: 1
  },
  renderer: am5xy.AxisRendererX.new(root, {
    minorGridEnabled: true
  }),
  tooltip: am5.Tooltip.new(root, {})
}));

var yAxis = chart.yAxes.push(am5xy.ValueAxis.new(root, {
  extraMin: 0.2,
  renderer: am5xy.AxisRendererY.new(root, {})
}));


// Add series
// https://www.amcharts.com/docs/v5/charts/xy-chart/series/
var series = chart.series.push(am5xy.LineSeries.new(root, {
  name: "Series",
  xAxis: xAxis,
  yAxis: yAxis,
  valueYField: "value",
  valueXField: "date",
  tooltip: am5.Tooltip.new(root, {
    labelText: "{valueY}"
  })
}));

// y axis for volume
var volumeAxisRenderer = am5xy.AxisRendererY.new(root, {});
volumeAxisRenderer.grid.template.set("forceHidden", true);
volumeAxisRenderer.labels.template.set("forceHidden", true);

var volumeAxis = chart.yAxes.push(am5xy.ValueAxis.new(root, {
  height: am5.percent(25),
  y: am5.percent(100),
  centerY: am5.percent(100),
  panY: false,
  renderer: volumeAxisRenderer
}));

// Add series
// https://www.amcharts.com/docs/v5/charts/xy-chart/series/
var volumeSeries = chart.series.push(am5xy.ColumnSeries.new(root, {
  name: "Volume Series",
  xAxis: xAxis,
  yAxis: volumeAxis,
  valueYField: "volume",
  valueXField: "date",
  tooltip: am5.Tooltip.new(root, {
    labelText: "{valueY}"
  })
}));

volumeSeries.columns.template.setAll({ fillOpacity: 0.8, strokeOpacity: 0, width: am5.percent(40) })


// Add scrollbar
// https://www.amcharts.com/docs/v5/charts/xy-chart/scrollbars/
chart.set("scrollbarX", am5.Scrollbar.new(root, {
  orientation: "horizontal"
}));


// Set data
var data = generateDatas(200);
series.data.setAll(data);
volumeSeries.data.setAll(data);


// Make stuff animate on load
// https://www.amcharts.com/docs/v5/concepts/animations/
series.appear(1000);
chart.appear(1000, 100);

}); // end am5.ready()
</script>

<!-- HTML -->
<div id="chartdiv"></div>