Develop Reference

How to displey negative values in highcharts js?

I try to draw a chart. Negative values are not drawing. Here is a link of picture:
new Highcharts.chart('container', {
chart: {
type: 'spline',
plotBorderWidth: 1,
zoomType: 'xy',
panning: {
enabled: true,
type: 'xy'
},
panKey: 'shift'
},
rangeSelector: {
selected: 1
},
title: {
text: 'David'
},
xAxis: {
min: -1,
max: 2,
title: {
text: "dcjdkjckjdkc"
}
},
yAxis: {
min: -120,
max: 120,
title: {
text: "dcjdkjckjdkc"
}
},
series: [{
name: 'AAPL Stock Price',
data: [-1, 0, -2, 1],
type: 'spline'
}, {
name: 'black',
data: dataRealGraph,
}]
});

Highcharts getJSON Not working

Been trying to get Highcharts to work, but getting the JSON is not working...
My JSON is just copied data from their examples but on my own servers:
JSON Data
And my Javascript is:
$.getJSON('./servercount.json', function(data) {
Highcharts.chart('container', {
chart: {
zoomType: 'x'
},
data: {
data: data
},
title: {
text: 'CakeBot Stats'
},
xAxis: {
type: 'datetime'
},
yAxis: {
title: {
text: 'Value'
}
},
legend: {
enabled: true
},
plotOptions: {
area: {
fillColor: {
linearGradient: {
x1: 0,
y1: 0,
x2: 0,
y2: 1
},
stops: [
[0, Highcharts.getOptions().colors[0]],
[1, Highcharts.Color(Highcharts.getOptions().colors[0]).setOpacity(0).get('rgba')]
]
},
marker: {
radius: 2
},
lineWidth: 1,
states: {
hover: {
lineWidth: 1
}
},
threshold: null
}
},
series: [
{
type: 'area',
name: 'Servers',
data: data
},
{
type: 'area',
name: 'Members',
data: data
}
]
});
});
The graph just wont load: http://cakebot.club/stats
Any ideas?

Highcharts add a new data point

I'm trying to update the highchart line graph say every minute. something like shown in this link jsfiddle
Right now, I use a periodic javascript call to the function that draws the graph. The problem is that it starts to draw it from beginning.
Is it possible to just add the new data point to the existing line?
$(function () {
$.getJSON('https://www.highcharts.com/samples/data/jsonp.php? filename=usdeur.json&callback=?', function (data) {
$('#container').highcharts({
chart: {
zoomType: 'x'
},
title: {
text: 'USD to EUR exchange rate over time'
},
subtitle: {
text: document.ontouchstart === undefined ?
'Click and drag in the plot area to zoom in' : 'Pinch the chart to zoom in'
},
xAxis: {
type: 'datetime'
},
yAxis: {
title: {
text: 'Exchange rate'
}
},
legend: {
enabled: false
},
plotOptions: {
area: {
fillColor: {
linearGradient: {
x1: 0,
y1: 0,
x2: 0,
y2: 1
},
stops: [
[0, Highcharts.getOptions().colors[0]],
[1, Highcharts.Color(Highcharts.getOptions().colors[0]).setOpacity(0).get('rgba')]
]
},
marker: {
radius: 2
},
lineWidth: 1,
states: {
hover: {
lineWidth: 1
}
},
threshold: null
}
},
series: [{
type: 'area',
name: 'USD to EUR',
data: data
}]
});
});
});

you should use the addPoint function in the data series...
here is an example of a chart that updates every second
http://jsfiddle.net/gh/get/jquery/1.9.1/highslide-software/highcharts.com/tree/master/samples/highcharts/demo/dynamic-update/

HighCharts axis flip on export

I have a Highchart in my web application. In the browser it displays normally which is as follows:
But when I export the chart it flips the axis and I end up with the following image:
Following are the options I am using for my Highchart.
var options = ({
chart: {
renderTo: 'chartDiv'
},
credits: {
enabled: false
},
title: {
text: ''
},
subtitle: {
text: ''
},
xAxis: {
type: 'datetime',
tickInterval: 7200 * 10000,
allowDecimals:false,
labels: {
format: '{value}',
rotation: 30,
align: 'left',
},
title: {
text: 'Date'
}
},
yAxis: [{
title: {
text: 'No. of rings'
},
min: 0
},
{ // Secondary yAxis
gridLineWidth: 0,
min: 0,
title: {
text: 'Accumulative Rings',
style: {
color: Highcharts.getOptions().colors[0]
}
},
labels: {
format: '{value} Ring',
style: {
color: Highcharts.getOptions().colors[0]
}
},
opposite: true,
}
],
tooltip: {
shared: true
},
legend: { backgroundColor: 'rgba(211,223,181,0.6)', layout: 'vertical', align: 'left', verticalAlign: 'top', floating: true, borderWidth: 0, x: 70 },
plotOptions: {
spline: {
marker: {
enabled: false
},
}
}
});
I have three series in my chart, the bar chart can have 0 values.
The data is coming from an ajax service, which I put in an array and then add to chart as follows:
chart.addSeries({
type: 'bar',
name: 'Rings per day ',
data: barData,
pointInterval: mainInterval
});
chart.addSeries({
type: 'spline',
name: 'Accumilative rings ',
data: spline1Data,
yAxis: 1,
});
chart.addSeries({
type: 'spline',
name: 'Planned Progress ',
data: spline2Data,
yAxis: 1,
color: "#FF0000"
});
What's wrong with my chart?

bar series is the key part. bar series forces chart to be rendered flipped. In your case use column. It displays differently on your browser because, most probably, you have an old version of Highcharts.

Move x-axis (tick, labels and line) in highcharts

Is it possible to move the y-position of the x-axis in highcharts? So far, I have only been able to move it to the top or bottom of my chart using
opposite: true/false
but now I need it to be in the middle of my graph, at a fixed y-value. My current code is
$(function () {
var chart;
$(document).ready(function () {
chart = new Highcharts.Chart({
chart: {
type: 'spline',
renderTo: 'container'
},
title: {
text: 'Title'
},
xAxis: {
opposite: true,
min: 0,
max: 4,
reversed: true,
startOnTick: true,
endOnTick: true,
lineWidth: 1
},
yAxis: {
labels: {
enabled: true
},
title: null,
gridLineWidth: 0,
min: 1,
max: 3.1
},
plotOptions: {
bar: {
dataLabels: {
enabled: true
}
}
},
credits: {
enabled: false
},
series: [{
marker: {
enabled: false
},
name: 'Year 1800',
data: [
[1, 1],
[2.5, 1]
],
showInLegend: false
}, {
marker: {
enabled: false
},
name: 'Year 1900',
data: [
[1.5, 2],
[3, 2]
],
showInLegend: false
}, {
name: 'name1',
data: [
[2, 3]
],
type: 'scatter',
zindex: 10
}, {
name: 'name2',
data: [
[3, 3]
],
type: 'scatter'
}, {
name: 'name3',
data: [
[1.5, 3]
],
type: 'scatter'
}]
});
});
});
My JSfiddle is http://jsfiddle.net/5xum/fVpqU/7/ .
I want the x axis (along with the ticks and labels) to run through y=2.5, between the two different data sets. Does HighCharts support this?

You can use offset property to move xAxis. In your case you have to use negative offset to move xAxis down:
xAxis: {
opposite: true,
min: 0,
max: 4,
reversed: true,
startOnTick: true,
endOnTick: true,
lineWidth: 1,
offset: -130
},

$(function () {
Highcharts.setOptions({
global: {
useUTC: false
}
});
$('#container').highcharts({
chart: {
type: 'bar'
},
title: {
text : <%=jtitle%>
},
xAxis : {
min:Date.UTC(2016, 0, 0),
max:Date.UTC(2016, 11, 1),
//allowDecimals: false,
type : 'datetime',
tickInterval : 24 * 3600 * 1000*30, //one day
labels : {
rotation : 0
},
},
yAxis: {
dateTimeLabelFormats: {
day: '%Y' },
labels :{
formatter:function() {return Highcharts.dateFormat('%Y',this.value);}
},
title: {
text: 'Date'
},
plotLines: [{
value: 0,
width: 5,
color: '#808080'
}]
},
series : [
{
name : 'MB Data',
data : <%=datasp%>,
tooltip: {
valueDecimals: 2,
dateTimeLabelFormats: {
hour: '%H:%M'
}
}
},
{
name : 'Date & Time',
data : <%=datetime%>
},
]
});
});