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I have an API which returns JSON data like this:
[
{
"name":"Something",
"data":[
{
"x":1541096421,
"y":2
},{
"x":1541436378,
"y":4
},{
"x":1553621371,
"y":2
}
]
},{
"name":"Something else",
"data":[
{
"x":1541096421,
"y":2
},{
"x":1541436378,
"y":4
},{
"x":1553621371,
"y":2
}
]
}
]
The x axis represents date/time and the y axis is a score. It's plotted on a chart like this, using some formatting to convert the date from millisecond timestamp to a readable date format:
function renderChart(data) {
$('#chartContainer').highcharts({
chart: {
type: 'scatter',
zoomType: 'xy'
},
title: {
text: chartTitle()
},
xAxis: {
allowDecimals: false,
title: {
text: 'Date completed',
scalable: false
},
type: 'datetime',
labels: {
formatter: function () {
if (true) {
return Highcharts.dateFormat('%d-%b-%y', moment.unix(this.value));
}
else {
if (this.value > 0 && this.value < 24) {
return this.value;
}
else
return 0;
}
}
},
tickPixelInterval: 100
},
yAxis: {
title: {
text: 'Score'
}
},
plotOptions: {
scatter: {
marker: {
radius: 5
}
}
},
series: data,
exporting: {
buttons: {
contextButton: {
menuItems: Highcharts.getOptions().exporting.buttons.contextButton.menuItems.filter(item => item !== 'openInCloud')
}
}
// Tried adding this but it doesn't make any difference:
/*,
csv: {
dateFormat: '%d/%m/%Y'
}*/
},
tooltip: {
formatter: function () {
return 'Score of <b>' + this.y + '</b> posted on <b>' + Highcharts.dateFormat('%d-%b-%y', moment.unix(this.x)) + '</b>';
}
}
});
}
This works fine. However, when I click 'export to CSV' in the Highchart graph on the front-end it outputs a CSV file where the date is always showing as "18/01/1970". Obviously it's something to do with the fact that the API is returning a timestamp value, but I don't see how I can modify the format in the CSV similar to how it's done in the chart rendering code.
Can anyone advise how (preferably without modifying the data returned by the API) to get the CSV to output a correct date in day/month/year format?
Many thanks
It can be done easily by wrapping Highcharts.Chart.prototype.getDataRows method and map the data array which is used for export. Check demo and code posted below.
Code:
(function(H) {
H.wrap(H.Chart.prototype, 'getDataRows', function(proceed, multiLevelHeaders) {
var rows = proceed.call(this, multiLevelHeaders);
rows = rows.map(row => {
if (row.x) {
row[0] = Highcharts.dateFormat('%d-%b-%y', row.x * 1000);
}
return row;
});
return rows;
});
}(Highcharts));
Demo:
https://jsfiddle.net/BlackLabel/yafx8cb1/1/
Docs:
https://www.highcharts.com/docs/extending-highcharts/extending-highcharts
As per #Core972's comment, the issue here is related to the timestamp in the API returning the date as seconds rather than milliseconds. I don't believe there is a way to manipulate the date format in the CSV export specifically so it will require a change to the API which returns the data.
Wojciech Chmiel's answer demonstrates how to override Highchart's output to re-format the date from a non-ideal source.
I'm trying to get this chart to only be dotted for the last month:
chart_data = [[1496275200000, 981], [1498867200000, 1089], [1501545600000, 1595], [1504224000000, 1296], [1506816000000, 1678], [1509494400000, 1879], [1512086400000, 2028], [1514764800000, 1885], [1517443200000, 1366], [1519862400000, 1558], [1522540800000, 1636], [1525132800000, 2438], [1527811200000, 2899], [1530403200000, 2521], [1533081600000, 2879], [1535760000000, 1702]]
Highcharts.chart('container', {
title: {
text: 'Zone with dash style'
},
subtitle: {
text: 'Dotted line typically signifies prognosis'
},
xAxis: {
type: 'datetime',
labels: {
formatter: function () {
return Highcharts.dateFormat('%Y-%m', this.value)
}
},
tickInterval: 30 * 24 * 3600 * 1000,
},
series: [{
data: chart_data,
zoneAxis: 'x',
zones: [{
value: chart_data.length - 2
}, {
dashStyle: 'dot'
}]
}]
});
https://jsfiddle.net/aL57381b/
(This highcharts code is basically the same as: http://jsfiddle.net/gh/get/library/pure/highcharts/highcharts/tree/master/samples/highcharts/series/color-zones-dashstyle-dot/ from the highcharts documentation, just with my time-series data instead.
However, it makes the entire chart turn dotted instead of just the last bit. Any ideas why? I can't seem to fix this.
You need the real value not the starting index like that :
dottedStartIndex = chart_data[chart_data.length - 2][0];
Highcharts.chart('container', {
...
zones: [{
value: dottedStartIndex
}, {
dashStyle: 'dot'
}]
Fiddle
in my application I use angular Highstock for charts. I have a lot of data (many millions), and now i want to put the existing buttons for set date range (1week, 1 month, 3 months, 1year, all), but also to click on any button to send a new request to the server to not accumulating data. Example, if pressed button "one week", that only the server retrieves the data for one week, if you click on a button to one month, to take data for a single month. I do not want to call unnecessary data, and that the server slows down, if I'm looking for data for one month, and the server comes back to me all data. Here is the code. Thanks in advance
> https://jsfiddle.net/tf7pr1ft/
Thnx to #Grzegorz Blachliński i fix this. here is code
$scope.chartConfig1 = {
xAxis: {
ordinal: false,
//za dodat date range postavit events i range selectors
events : {
afterSetExtremes: getDateRange //here i add my custom function
}
},
yAxis: {
plotLines: [{
color: '#FF0000',
width: 1,
value: 11.50,
label: {text: '11.50'}
}]
},
options: {
chart: {
zoomType: 'x',
backgroundColor: 'rgba(255, 255, 255, 1)',
polar: true,
type: 'line',
borderRadius: 5
},
legend: {
enabled: true
},
rangeSelector: {
selected : 0, //here i defined default range
enabled: true,
inputStyle: {
color: 'black'
}
},
navigator: {
enabled: true
}
},
series: [],
title: {
text: 'Solar and Battery voltage average'
},
useHighStocks: true
},
$scope.chartConfig1.series.push({
id: 1,
name: "Solar voltage average",
data: $scope.data[0],
tooltip: {
valueDecimals: 2
}
}, {
id: 2,
name: "Battery voltage average",
data: $scope.data[1],
tooltip: {
valueDecimals: 2
}
}
);
and here is my custom function
getDateRange = function (e) {
var date1 = new Date(e.min);
var date2 = new Date(e.max);
var timeDiff = Math.abs(date2.getTime() - date1.getTime());
var diffDays = Math.ceil(timeDiff / (1000 * 3600 * 24));
$http.get(serviceBase + 'aaaaa/aaaaaa/' + $stateParams.klupaID + '/aaaaaaa?days=' + diffDays, function(data){
//ukoliko buden dodavat još koji config obavezno dodat broj koliko ih ima na i<=8
for (i=1; i<=8; i++){
$scope.chartConfigString = 'chartConfig' + i;
$scope.chartConfigString.series[0].setData(data);
$scope.chartConfigString.hideLoading();
}
});
};
Now i have another problems, i want to have four selectors (buttons), 1months, 3months, 1year and ALL. I set default range, when open app, on 1month, and here is problem. Buttons for another range is disabled, beacause i get data from url only for one month. I want to have enabled all buttons for select any range. Thnx
I am in the process of moving from a built in graph library to HighStock.
I have to comply to crasy implementations. So at the end I got this configuration :
$(function() {
chart = new Highcharts.StockChart({
chart : {
renderTo : 'div_#divid#'
},
rangeSelector : {
selected : 0,
buttons: [{
type: 'day',
count: 7,
text: '7j'
}, {
type: 'day',
count: 15,
text: '15j'
}, {
type: 'day',
count: 30,
text: '30j'
}, {
type: 'all',
text: 'Tous'
}]
},
series : [{
type : 'column',
name : 'valeur',
data : data,
tooltip: {
valueDecimals: 2
}
}]
});
});
Here is the fiddled version.
I don't get whats wrong with my data. (but I think I did correctly the conversion for the dates.)
[[1362355200000,672],[1362441600000,9764],[1362528000000,9839],[1362614400000,9906], [1362700800000,9973],[1362787200000,9906],[1362873600000,10592],[1362960000000,11236], [1363046400000,13233],[1363132800000,0],[1363219200000,0],[1363305600000,0],[1363392000000,0],[1363478400000,0],[1363564800000,0],[1363651200000,0],[1363737600000,0],[1363824000000,0],[1363910400000,0],[1363996800000,0],[1364083200000,0],[1364169600000,0],[1364256000000,0],[1364342400000,0],[1364428800000,0],[1364515200000,0],[1364601600000,0],[1364688000000,0],[1364770800000,0],[1364857200000,0],[1364943600000,0],[1365030000000,0],[1365116400000,0],[1365202800000,0],[1365289200000,0],[1365375600000,0],[1365462000000,0],[1365548400000,0],[1365634800000,0],[1365721200000,0],[1365807600000,0],[1365894000000,0],[1365980400000,0],[1366066800000,0],[1366153200000,0],[1366239600000,0],[1366326000000,0],[1366412400000,0],[1366498800000,0],[1366585200000,0],[1366671600000,0],[1366758000000,0],[1366844400000,0],[1366930800000,0],[1367017200000,0],[1367103600000,0],[1367190000000,0],[1367276400000,0],[1367362800000,0],[1367449200000,5490]]
Thanks for your help.
I'm not sure, the problem is that you can't see the chart? That's cause your data contains '
Check the jsFiddle: http://jsfiddle.net/SqZY2/1/
You have this:
data = '[[1362355200000,672],[1362441600000,9764],[1367103600000,0],[1367190000000,0],[1367276400000,0],[1367362800000,0],[1367449200000,5490]]';
Must be this:
data = [[1362355200000,672],[1362441600000,9764],[1362528000000,9839],[1362614400000,9906],[1367103600000,0],[1367190000000,0],[1367276400000,0],[1367362800000,0],[1367449200000,5490]];
The API doesn't show a proper example how to use connectNulls property. I had a few attempts but no luck. Here is what I have:
Attempt 1:
plotOptions :
{
line: { connectNulls : true}
},
This results in: TypeError: Cannot read property 'x' of undefined
Attempt 2:
plotOptions :
{
series:
{
gapSize: null,
line: { connectNulls : true}
}
},
This doesn't give me any errors, so I assume this is closest to be the correct way, however nothing changes: the points from either side of null points are not connected.
Can anyone share a code snipped that shows the correct way of doing it?
The highcharts API has two examples for the connectNulls property: one for true, and one for false.
http://api.highcharts.com/highcharts#series.connectNulls
The true example: http://jsfiddle.net/gh/get/jquery/1.7.1/highslide-software/highcharts.com/tree/master/samples/highcharts/plotoptions/series-connectnulls-true/
A snippet from the true example:
plotOptions: {
series: {
connectNulls: true
}
},
The false example: http://jsfiddle.net/gh/get/jquery/1.7.1/highslide-software/highcharts.com/tree/master/samples/highcharts/plotoptions/series-connectnulls-false/
A snippet from the false the example:
plotOptions: {
series: {
// connectNulls: false // by default
}
},
The default of false is a thoughtful choice, because when you connect values when there is no data, the results can lead to false assumptions on the part of the viewer of the chart.
UPDATE
Here's a Highstock example:
$(function() {
window.chart = new Highcharts.StockChart({
chart : {
renderTo : 'container'
},
rangeSelector : {
selected : 1
},
title : {
text : 'AAPL Stock Price'
},
series : [{
name : 'AAPL',
connectNulls: true,
data : [
[1112832000000,43.56],
[1112918400000,43.74],
[1113177600000,41.92],
[1113264000000,null],
[1113350400000,null],
[1113436800000,37.26],
[1113523200000,35.35],
[1113782400000,35.62],
[1113868800000,37.09],
[1113955200000,35.51],
[1114041600000,37.18],
[1114128000000,35.50],
[1114387200000,36.98],
[1114473600000,36.19],
[1114560000000,35.95],
[1114646400000,35.54],
[1114732800000,36.06]
],
tooltip: {
valueDecimals: 2
}
}]
});
});