Develop Reference

not able ot show date in x axis in highcharts

i want to show date in x asis but not able to show. showing values like this 00.00.00.100 in the graph.unable to convert 1577844000000 to proper date,month,year in javascript to show in the x axis using dateTimeLabelFormats in highcharts.how to use ticks and how to show it in graphs.
ticks values are printing in the console like this.
sample tick data
1577844000000
1577843100000
1577842200000
1577841300000
15778404000
sample data from the response
DeviceTimeStamp: "2020-01-10T00:30:00"
code
getalldata();
function getalldata() {
var xhttp_roomlogs = new XMLHttpRequest();
xhttp_roomlogs.onreadystatechange = function () {
if (this.readyState == 4 && this.status == 200) {
var response = JSON.parse(xhttp_roomlogs.responseText);
var Ch1Temp = [];
var Ch2Temp = [];
$(response).each(function (i, item) {
var date = UtcToIst(item.DeviceTimeStamp);
var ticks = Date.UTC(date.getFullYear(), date.getMonth(), date.getDate(), date.getHours(), date.getMinutes(), date.getSeconds());
Ch1Temp.push([ticks, item.Ch1Temp])
Ch2Temp.push([ticks, item.Ch2Temp])//
});
$('#container').empty();
var labels = response.map(function (e) {
var roomtempdata = e.Ch1Temp;
return parseFloat(roomtempdata);
})
var ch2temp = response.map(function (e) {
var roomtempdata = e.Ch2Temp;
return parseFloat(roomtempdata);
})
Highcharts.chart('container', {
credits: {
enabled: false
},
title: {
text: 'Chamber 1 & 2 Temp'
},
subtitle: {
text: 'in Degree Celcius'
},
xAxis: {
type: 'datetime',
dateTimeLabelFormats: { // don't display the dummy year
month: '%e. %b',
year: '%b'
},
title: {
text: 'Date'
}
},
yAxis: {
title: {
text: 'Temperature'
}
},
legend: {
layout: 'vertical',
align: 'right',
verticalAlign: 'middle'
},
//y co-ordinates
series: [{
name: 'Chamber 1 Temp',
data: labels
},
{
name: 'Chamber 2 Temp',
data: ch2temp
}
],
responsive: {
rules: [{
condition: {
maxWidth: 500
},
chartOptions: {
legend: {
layout: 'horizontal',
align: 'center',
verticalAlign: 'bottom'
}
}
}]
}
});
//highcharts end
}
};
xhttp_roomlogs.open("GET", "/api/data", true);
xhttp_roomlogs.send();
}
function UtcToIst(data) {
var dt = new Date(data);
return dt;
}

You can convert the json date using:
var jsonDate = "\/Date(1577844000000)\/".substr(6);
var dateObject = new Date(parseInt(jsonDate ));
var stringDate = (dateObject.getMonth() + 1) + "/" + dateObject.getDate() + "/" + dateObject.getFullYear();
console.log("Dat Object:" + dateObject);
console.log("String Date:" + stringDate);
sample hightchart code:
Highcharts.chart('container', {
chart: {
type: 'column'
},
xAxis: {
categories: ['1/1/2020', '1/2/2020', '1/3/2020', '1/4/2020', '1/5/2020']
},
plotOptions: {
column: {
stacking: 'normal'
}
},
legend: {
labelFormatter: function () {
if(this.data.length > 0) {
return this.data[0].category;
} else {
return this.name;
}
}
},
series: [{
data: [{x:0,y:1}],
name: '1/1/2020'
},{
data: [{x:1,y:1}],
name: '1/2/2020'
},{
data: [{x:2,y:1}],
name: '1/3/2020'
},{
data: [{x:3,y:1}],
name: '1/4/2020'
},{
data: [{x:4,y:1}],
name: '1/5/2020'
}]
});
<script src="https://code.highcharts.com/highcharts.js"></script>
<script src="https://code.highcharts.com/modules/exporting.js"></script>
<script src="https://code.highcharts.com/modules/export-data.js"></script>
<script src="https://code.highcharts.com/modules/accessibility.js"></script>
<figure class="highcharts-figure">
<div id="container"></div>
</figure>

reading data from CSV and show continuous graph

I am trying to plot a chart which will read a data from csv file which is appending on every minute with latest data as per below format.
The chart will continue reading data from csv file and show the graph on every second wise. Can you please help me on this? I want to show the exact time which are coming from file should be show on graph.
CSV format..
time,count
18:01:00,3
18:01:01,4
....
$(document).ready(function () {
var csv = [],
x;
Highcharts.setOptions({
global: {
useUTC: false
}
});
var data = 'time,count\n18:01:00,3\n18:01:01,4';
//$.get('data.csv', function(data) {
var lines = data.split('\n');
$.each(lines, function(lineNo, line) {
if(lineNo > 0) {
var items = line.split(',');
useUTC: false;
x = items[0].split(':');
csv.push([Date.UTC(2015,1,1,x[0],x[1],x[2]), parseFloat(items[1])]);
}
});
console.log(csv);
$('#container').highcharts({
chart: {
renderTo: 'container',
type: 'spline',
animation: Highcharts.svg, // don't animate in old IE
marginRight: 10,
useUTC: false,
events: {
load: function () {
// set up the updating of the chart each second
var series = this.series[0];
setInterval(function () {
var l = series.data.length - 1,
lastX = series.data[l].x;
$.get('data.csv', function(data) {
var lines = data.split('\n'),
len = lines.length,
items = lines[len - 1].split(','),
x = items[0].split(':'),
y = parseFloat(items[1]);
useUTC: false;
x = Date.UTC(2015,1,1,x[0],x[1],x[2]);
if(x !== lastX) {
series.addPoint([x, y], true, true);
}
});
}, 1000); //refresh each 1 second
}
}
},
title: {
text: 'TPS Data'
},
xAxis: {
type: 'datetime',
tickPixelInterval: 150
},
yAxis: {
title: {
text: 'Value'
},
plotLines: [{
value: 3,
width: 1,
color: '#808080'
}]
},
tooltip: {
formatter: function () {
return '<b>' + this.series.name + '</b><br/>' +
Highcharts.dateFormat('%H:%M:%S', this.x) + '<br/>' +
Highcharts.numberFormat(this.y, 2);
}
},
legend: {
enabled: false
},
exporting: {
enabled: false
},
series: [{
name: 'Count',
data: csv
}]
});
//});
});
div {
min-width: 50px;
height: 200px;
margin: 0 auto;
}
<script type="text/javascript" src="http://code.jquery.com/jquery-1.12.0.js"></script>
<script type="text/javascript" src="http://code.highcharts.com/highcharts.js"></script>
<div id="container" style=""></div>
Note In the snippet I was replace the ajax function $.get with hardcoded data so it will show the result but the question is about the ajax way.

Highcharts bar chart wont animate

Not sure why because I have done it in the past, but I have a Highcharts bar chart and it won't animate. This is the declaration of the chart,
function initializeData() {
$http.get(url).success(function(ret) {
$scope.jsondata = ret;
var newdata = [];
for (x = 0; x < 5; x++) {
newdata.push({
name: setName($scope.jsondata[x].name),
y: $scope.jsondata[x].data[0],
color: getColor($scope.jsondata[x].data[0])
});
}
$scope.chart.series[0].setData(newdata);
});
mainInterval = $interval(updateData, 5000);
}
function updateData() {
$http.get(url).success(function(ret) {
$scope.jsondata = ret;
console.debug("here");
for (x = 0; x < 5; x++) {
$scope.chart.series[0].data[x].update({
y: $scope.jsondata[x].data[0],
color: getColor($scope.jsondata[x].data[0])
});
}
});
}
$scope.chart = new Highcharts.Chart({
chart: {
renderTo: 'container',
type: 'bar',
animation: true,
events: {
load: initializeData
}
},
title: {
text: ''
},
xAxis: {
type: 'category',
labels: {
style: {
fontSize: '11px'
}
}
},
yAxis: {
min: 0,
max: 100,
title: {
text: 'Total Score',
align: 'high'
}
},
legend: {
enabled: false
},
tooltip: {
pointFormat: 'Total Score <b>{point.y:.3f}</b>'
},
series: [{
name: 'Active Users',
data: [],
dataLabels: {
enabled: true,
rotation: 30,
style: {
fontSize: '10px',
fontFamily: 'Verdana, sans-serif'
},
format: '{point.y:.3f}', // one decimal
}
}]
});
And as you can see I have animate : true, so I am not sure what is the problem here. I have this older plunker where all of the data is in separate series, but it animates fine. But this is the plunker I am working on and having trouble with. They are like identical basically. In the newer one I broke out the initialization of data into its own method, but that is the only real main difference.
Some edits:
So as I was saying, I have done things this way with an areaspline chart (I know it was said they work a bit different but they are set up identically).
function initializeData() {
$interval.cancel(mainInterval);
$scope.previousPackets = '';
$http.get("https://api.myjson.com/bins/nodx").success(function(returnedData) {
var newdata = [];
var x = (new Date()).getTime();
for (var step = 9; step >= 0; step--) {
newdata.push([x - 1000 * step, 0]);
}
$scope.chart.series[0].setData(newdata);
});
mainInterval = $interval(updateData, 2000);
}
function updateData() {
$http.get(url + acronym + '/latest').success(function(returnedData) {
var x = (new Date()).getTime();
if ($scope.previousPackets != returnedData[0].numPackets) {
$scope.chart.series[0].addPoint([x, returnedData[0].numPackets], true, true);
$scope.previousPackets = returnedData[0].numPackets;
} else {
$scope.chart.series[0].addPoint([x, 0], true, true);
}
});
}
$scope.chart = new Highcharts.Chart({
chart: {
renderTo: 'container',
type: 'areaspline',
animation: Highcharts.svg, // don't animate in old IE
marginRight: 10,
events: {
load: initializeData
}
},
title: {
text: ''
},
xAxis: {
type: 'datetime',
tickPixelInterval: 150
},
yAxis: {
title: {
text: 'Packets'
},
plotLines: [{
value: 0,
width: 1,
color: '#d9534f'
}]
},
tooltip: {
formatter: function() {
return Highcharts.numberFormat(this.y) + ' packets<b> | </b>' + Highcharts.dateFormat('%H:%M:%S', this.x);
}
},
legend: {
enabled: false
},
exporting: {
enabled: false
},
series: [{
name: 'Packets',
data: []
}]
});
I also updated the first chunk of code with the initializeData() method and updateData() method which are seemingly identical in both different charts.

It looks like it plays an important role if you provide your data at chart initialization or after. For simplicity I refactored your code a little
function initializeChart(initialData, onload) {
$scope.chart = new Highcharts.Chart({
chart: {
renderTo: 'container',
type: 'bar',
animation: true,
events: {
load: onload
}
....
series: [{
name: 'Active Users',
data: initialData,
dataLabels: {
enabled: true,
format: '{point.y:.3f}', // one decimal
}
}]
});
}
function getData(callback) {
$http.get(url).success(function(ret) {
$scope.jsondata = ret;
var newdata = [];
for (x = 0; x < 5; x++) {
newdata.push([setName(ret[x].name), ret[x].data]);
}
callback(newdata);
});
}
As a result your two planks are in essense reduced to two methods below. The first initializes chart with preloaded data and the second updates data in existing chart.
function readDataFirst() {
getData(function(newdata) {
initializeChart(newdata);
});
}
function initializeChartFirst() {
initializeChart([], function() {
getData(function(newdata) {
$scope.chart.series[0].setData(newdata);
})
});
}
The first one animates fine while the second does not. It looks like highcharts skips animation if dataset is not initial and is treated incompatible.
However if you really want to have animation in your current plant (chart first workflow) you can achieve that by initializing first serie with zeros and then with the real data. This case it will be treated as update
function forceAnimationByDoubleInitialization() {
getData(function(newdata) {
initializeChart([]);
var zerodata = newdata.map(function(item) {
return [item[0], 0]
});
$scope.chart.series[0].setData(zerodata);
$scope.chart.series[0].setData(newdata);
});
All these options are available at http://plnkr.co/edit/pZhBJoV7PmjDNRNOj2Uc

Create Line in Highcharts with start and end point

Please look at following example:
<script type="text/javascript">
var $j = jQuery.noConflict();
function recalculateUTCValue(startingUTC, add) {
zeit = new Date(startingUTC);
zeit.setDate(zeit.getDate()+add);
return zeit;
}
function calcDateFromUTC(utc) {
d = new Date(utc);
return d;
}
function getDaysUntilEnd(utc) {
var currentTime = new Date();
var endTime = calcDateFromUTC(utc);
var diff = Math.floor(( Date.parse(endTime) - Date.parse(currentTime) ) / 86400000);
return diff;
}
</script>
<script type="text/javascript">
var highchartsOptions = Highcharts.setOptions(Highcharts.theme);
var TaskChart; // Chart-Objekt
var container = $j('#chart01')[0];
var TaskDuration = new Array();
var startingKW = 298;
// Save starting points to javascript variables for HighCharts
var startingUTC = 1288087223364;
// For a given time point id
var startTimePoint = 0;
var endTimePoint = 0;
TaskDuration = [0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,216.0,216.0,216.0,198.0,134.0,134.0,134.0,171.0,171.0,171.0,149.0,160.5,160.5,160.5];
// Get first value which is not "0"
var firstValue = 0;
for(var i = 0; i < TaskDuration.length; i++) {
if(TaskDuration[i] != 0) {
firstValue = i;
break;
}
}
// Get largest Y-Value; need for automatically zooming (setExtremes method)
var largest = Math.max.apply(Math, TaskDuration);
var myStartDate;
var myEndDate;
// Check if we have a time point in the query
if(startTimePoint != 0) {
var myStartDate = calcDateFromUTC(startTimePoint);
var myEndDate = calcDateFromUTC(endTimePoint);
} else {
// Otherwise we use the time of first created work item
var myStartDate = recalculateUTCValue(startingUTC, firstValue);
var myEndDate = new Date();
}
</script>
<script type="text/javascript">
$j(document).ready(function() {
TaskChart = new Highcharts.Chart({
credits: {
enabled: false
},
chart: {
renderTo: "chart01",
defaultSeriesType: 'line',
zoomType: 'x',
events: {
load: function(event) {
this.xAxis[0].setExtremes(myStartDate, myEndDate);
this.yAxis[0].setExtremes(0,largest);
}
}
},
title: {
text: "Task Burn Down Chart"
},
xAxis: {
type: 'datetime',
dateTimeLabelFormats: {
week: '%e. %b %Y'
},
labels: {
align: 'right',
rotation: -60,
x: 5,
y: 15
},
offset: 10
},
yAxis: {
title: {
text: "Number of Hours"
}
},
tooltip: {
formatter: function() {
return '<b>'+ this.series.name +'</b><br/>' + Highcharts.dateFormat('%d.%m', this.x) +': '+ this.y;;
}
},
plotOptions: {
area: {
stacking: 'normal',
lineColor: '#666666',
lineWidth: 1,
marker: {
lineWidth: 1,
lineColor: '#666666'
}
}
},
series: [
{
name: 'Hours',
pointStart: startingUTC,
pointInterval: 24*60*60*1000,
data: TaskDuration
},
{
type: 'line',
name: 'Regression Line',
data: [[myStartDate, 216], [myEndDate, 50]],
marker: {
enabled: false
},
states: {
hover: {
lineWidth: 0
}
},
enableMouseTracking: false
}]
});
});
</script>
http://jsfiddle.net/JwmuT/8/
The goal is to create a Highchart line with starting point from X-Value 26th January and with the end point on the X-Value 7th February. Corresponding Y-Values are "260" and "0".
How to create a simple line with these to points in HighCharts? Maybe Highcharts is able to do a linear regression on the fly?!
I have found this demo but I do not know how to pass correctly X-Values in the Date format.

Highcharts doesn't calculate any type of regression or trend lines. In example you have posted, data is calculated before, and Highcharts just displays that. However there is known plugin for trendline: https://github.com/virtualstaticvoid/highcharts_trendline

Remove starting "0" values from Highcharts series array

I have following generated JavaScript-Code to display a chart with HighCharts:
<script type="text/javascript">
var highchartsOptions = Highcharts.setOptions(Highcharts.theme);
var TaskChart; // Chart-Objekt
var TaskDuration = new Array();
// Save starting points to javascript variables for HighCharts
var startingUTC = 1288102643364;
TaskDuration = [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,206,216,216,206,206];
for(var i = 0; i < TaskDuration.length; i++) {
if(TaskDuration[i] == 0) {
TaskDuration[i] = null;
}
}
</script>
<script type="text/javascript">
$j(document).ready(function() {
TaskChart = new Highcharts.Chart({
credits: {
enabled: false
},
chart: {
renderTo: "chart01",
defaultSeriesType: 'area',
zoomType: 'x',
spacingBottom: 250
},
title: {
text: "Task Duration"
},
xAxis: {
type: 'datetime',
dateTimeLabelFormats: {
week: '%e. %b %Y'
},
offset: 10,
startOnTick: true,
maxZoom: 7 * 24 * 3600000 // seven days
},
yAxis: {
title: {
text: "Duration"
}
},
tooltip: {
formatter: function() {
return '<b>'+ this.series.name +'</b><br/>';
}
},
plotOptions: {
area: {
stacking: 'normal',
lineColor: '#666666',
lineWidth: 1,
marker: {
lineWidth: 1,
lineColor: '#666666'
}
}
},
series: [
{
name: 'Duration',
pointStart: startingUTC,
pointInterval: 24*60*60*1000,
data: TaskDuration
}]
});
});
</script>
The problem is now that I want to remove all the "0" values from the beginning of the TaskDuration series array.
I try to set the values in the array to 'null':
for(var i = 0; i < TaskDuration.length; i++) {
if(TaskDuration[i] == 0) {
TaskDuration[i] = null;
}
}
But Highcharts still display the values in the chart.
How to prevent this behavior?
I also try to remove all values from the array until a value which is not "0". But with this approach the "startingUTC" is wrong. Maybe I have also to recalculate this value...
Regards,
Sandro

You need to remove elements not to set null, use this to remove zero element from array:
var myArray=[];
for(var i = 0; i < TaskDuration.length; i++) {
if(TaskDuration[i] != 0) {
myArray.push(TaskDuration[i]);
}
}
working JSfiddle

The problem is that you're using pointStart and pointInterval.
PointInterval will ignore your null points and will add points to the yAxis.
So, remove it.
series: [{
name: 'Duration',
data: TaskDuration
}]