One issue arises when dealing with a large amount of data in highcharts' historyData - upon zooming, the data is only present at one-second intervals, rather than milliseconds. This results in missing millisecond data when zoomed in on a chart with substantial history data.
To replicate this issue, please visit the provided link and wait until there is a significant dataset in the historyData. Then, adjust the interval in the setInterval method from 20 to a larger number like 20000. Upon zooming in using rangeselector, you will notice that only second data is plotted, while millisecond data is absent.
This issue can be seen in action here: https://jsfiddle.net/nh5ap21m/
I have referred to the Highcharts API documentation: https://api.highcharts.com/highcharts/plotOptions.series.pointInterval and experimented with various parameters such as pointInterval, pointIntervalUnit, connectNulls, gapSize, and gapUnit, but have yet to find a definitive solution.
To change the interval, use the following code:
setInterval(function () {
var x = (new Date()).getTime(), // current time
y = Math.round(Math.random() * 100);
series1.addPoint([x, y], true, true);
}, 20);
var series2 = this.series[1];
setInterval(function () {
var x = (new Date()).getTime(), // current time
y = Math.round(Math.random() * 50);
series2.addPoint([x, y], true, true);
}, 20);
Expected Result: When zoomed in on the historyData of the chart, both seconds and milliseconds data should be plotted accurately.
// Create the chart
Highcharts.stockChart('container', {
chart: {
events: {
load: function () {
// set up the updating of the chart each second
var series1 = this.series[0];
setInterval(function () {
var x = (new Date()).getTime(), // current time
y = Math.round(Math.random() * 100);
series1.addPoint([x, y], true, true);
}, 20);
var series2 = this.series[1];
setInterval(function () {
var x = (new Date()).getTime(), // current time
y = Math.round(Math.random() * 50);
series2.addPoint([x, y], true, true);
}, 20);
}
}
},
time: {
useUTC: false
},
rangeSelector: {
buttons: [{
count: 1,
type: 'minute',
text: '1M'
}, {
count: 5,
type: 'minute',
text: '5M'
}, {
type: 'all',
text: 'All'
}],
inputEnabled: false,
selected: 0
},
title: {
text: 'Live random data'
},
exporting: {
enabled: false
},
legend: {
enabled: true
},
plotOptions: {
series: {
marker: {
states: {
hover: {
enabled: true,
animation: {duration: 100},
enableMouseTracking: true,
stickyTracking: true
}
}
}
}
},
tooltip:{
shared: true,
split: false,
stickyTracking: true,
enableMouseTracking: true,
enabled: true,
followPointer: true,
followTouchMove: true,
formatter: function(){
var tooltip = "";
var phaseNameList = "";
//tooltip += "<b>I-unit "+ "<br/>"+ "x: "+this.x +"</b>";
tooltip += "<b>I-unit "+ "<br/>"+ "x: "+ new Date(this.x)+
"</b>";
tooltip += "<br/>"+ "y: "+this.y +"</b>";
tooltip += "<br/>"+ this + "</b>";
return tooltip;
}
},
series: [{
name: 'Random data1',
data: (function () {
// generate an array of random data
var data = [],
time = (new Date()).getTime(),
i;
for (i = -999; i <= 0; i += 1) {
data.push([
time + i * 1000,
Math.round(Math.random() * 100)
]);
}
return data;
}())
},
{
name: 'Random data2',
data: (function () {
// generate an array of random data
var data = [],
time = (new Date()).getTime(),
i;
for (i = -999; i <= 0; i += 1) {
data.push([
time + i * 1000,
Math.round(Math.random() * 50)
]);
}
return data;
}())
}]
});<script src="https://code.highcharts.com/stock/highstock.js"></script>
<script src="https://code.highcharts.com/stock/modules/exporting.js"></script>
<script src="https://code.highcharts.com/stock/modules/export-data.js"></script>
<div id="container" style="height: 400px; min-width: 310px"></div>