Develop Reference

Highcharts with custom scaling in upper regions

I would like to know how to achieve a custom scale for a chart in Highcharts. I want to display a boxplot which has very high whiskers. The normal values to display are between 500 and 1000 but there are some anomalies which are about 6000 on y-axis. This is causing the whole chart to be squeezed and the scaling is so small that you can't determine the boxplots correctly. I would like to increase the tick-size between 1000 and 6000 to decrease the heigt of the chart.

Highcharts provides breaks functionality that seems to be ideal for your case: https://api.highcharts.com/highcharts/yAxis.breaks
Another approach is to change the yAxis type to logarithmic: https://api.highcharts.com/highcharts/yAxis.type
EDIT
The discussion in the comments section reveals that the OP needs rather custom y axis formatting than breaks functionality.
Here's how to approach this issue:
The problem here is that axes in Highcharts can only have either constant or logarythmic scales. Your example shows irregular scale - the values are not in constant or logarythmic order ([0, 3, 10, 30, 150]).
Here's what I've done to mimic that kind of look and behaviour:
I set tickPositions to [0, 1, 2, 3, 4] - these are the actual values that appear on the chart. As you can see the distance between all these numbers is constant: 1.
Then I used formatter to display corresponding number from ranges array for each label.
yAxis: {
tickPositions: [0, 1, 2, 3, 4],
labels: {
formatter: function() {
return ranges[this.pos];
}
}
},
Before I passed the data to the chart constructor I converted all the values so that they're between 0 and 4:
series: [{
data: [2, 120].map(function(val) {
var range = findRange(val);
var y = range.index + (val - range.low) / (range.high - range.low);
return {
y: y,
originalValue: val
};
})
}]
Finally I used originalValue property in tooltip.format string to print to the user the number before the conversion.
tooltip: {
pointFormat: "<span style='color:{point.color}'>\u25CF</span> {series.name}: <b>{point.originalValue}</b><br/>"
},
This example is simplified to the line series case but can be easily adjusted to boxplot series. The code serves only for the example purposes and should be improved - it's easy to cause an error within it.
Live working demo: https://jsfiddle.net/kkulig/ytjz1jej/
API references:
https://api.highcharts.com/highcharts/tooltip.pointFormat
https://api.highcharts.com/highcharts/yAxis.tickPositions
https://api.highcharts.com/highcharts/xAxis.labels.formatter

Hiding HighCharts StackLabels when series is large

there are a few questions about stacklables on SO, but I don't see any related to my question.
Right now, I have a pretty standard column chart (built with HighCharts). It has basic stack labels and everything works fine. However, when a user expands the viewset of the data (in essence expanding the size of the series) the StackLabels (labels above individual columns) overlap and look messy.
So, I want to hide the stack labels for all columns when the series is say >= 20.
Right now, my stack labels are shown like this:
yAxis: {
min: 0,
title: {
text: 'My Title'
},
stackLabels: {
enabled: true,
formatter: function () {
//if more than 20 points, hide them
if (this.series.length >= 20) {
return ''
}
//else show them
return this.total
}
},
But this doesn't work because the context for 'this' isnt correct, thus this.series.[anything] returns undefined. It seems 'this' is referring to the point..but I need to reference the chart that contains the point.
Is this possible?

This in the formatter does not refer to the chart object nor the axis. Also, data from the series is not yet available. However, you can get the length of the data from the options.
formatter: function() {
//if more than 20 points, hide them
if (this.axis.series[0].options.data.length >= 20) {
return false
}
//else show them
return this.total
}
example: http://jsfiddle.net/6mmLu3ct/

C3 Bar Graph x-axis labels are too congested

I have created a Bar graph using C3 JS plugin, The graph is working fine but the problem is with the x-axis labels looks too congested like as shown below
Working JSFiddle
My Code is as given below
var chart = c3.generate({
bindto: "#chart",
data: {
x : 'x',
columns: [
['x', "2016-04-01","2016-04-08","2016-04-15","2016-04-22","2016-04-29","2016-05-06","2016-05-13","2016-05-20","2016-05-27","2016-06-03","2016-06-10","2016-06-17","2016-06-24","2016-07-09","2016-07-10","2016-07-11","2016-07-12","2016-07-13","2016-07-15","2016-07-16","2016-07-17","2016-07-18","2016-07-19","2016-07-20","2016-07-21","2016-07-22","2016-07-23","2016-07-24","2016-07-25","2016-07-26","2016-07-27","2016-07-28","2016-07-29","2016-07-30","2016-07-31","2016-08-01","2016-08-02","2016-08-03","2016-08-04","2016-08-05","2016-08-06","2016-08-07","2016-08-08","2016-08-09","2016-08-10","2016-08-11","2016-08-12","2016-08-13","2016-08-14","2016-08-15","2016-08-16","2016-08-17","2016-08-18","2016-08-19","2016-08-20","2016-08-21","2016-08-22","2016-08-23","2016-08-24","2016-08-25","2016-08-26","2016-08-27","2016-08-28","2016-08-29","2016-08-30","2016-08-31","2016-09-01","2016-09-02","2016-09-03","2016-09-04","2016-09-05","2016-09-06","2016-09-07","2016-09-08","2016-09-09","2016-09-10","2016-09-11","2016-09-12","2016-09-13","2016-09-14","2016-09-15","2016-09-16","2016-09-17","2016-09-18","2016-09-19","2016-09-20","2016-09-21","2016-09-22","2016-09-23","2016-09-24","2016-09-25","2016-09-26","2016-09-27","2016-09-28","2016-09-29","2016-09-30","2016-10-01","2016-10-02","2016-10-03","2016-10-04","2016-10-05","2016-10-06","2016-10-07","2016-10-08","2016-10-09","2016-10-10","2016-10-11","2016-10-12","2016-10-13","2016-10-14","2016-10-15","2016-10-16","2016-10-17","2016-10-18","2016-10-19","2016-10-20","2016-10-21","2016-10-22","2016-10-23","2016-10-24","2016-10-25","2016-10-26","2016-10-27","2016-10-28","2016-10-29","2016-10-30","2016-10-31","2016-11-01","2016-11-02","2016-11-03","2016-11-04","2016-11-09"],
['pv1', 2500,2500,2500,2500,2500,2500,2500,2500,2500,2500,2500,2500,2500,2696,2696,2696,2696,2696,2696,2696,2696,2696,2696,2696,2696,2696,2696,2696,2696,2748,2748,2694,2694,2694,2694,2694,2694,2694,2668,2668,2668,2668,2576,2572,2572,3043,3084,3084,3084,3084,3084,3156,3521,3521,3550,3542,3542,3573,3580,3629,3579,3584,3542,2757,2791,2696,3415,3415,3415,3415,3415,3415,3415,3415,3415,3415,3415,3415,3415,3415,3415,3415,3415,3415,3415,3415,3415,3415,3415,3415,3415,3415,3415,3415,3415,3415,3415,3415,3415,3415,3415,3415,3414,3414,3414,3414,3414,3414,3414,3414,3414,3414,3414,3414,3414,3369,3376,3371,3373,3371,3379,3363,3373,3347,3348,3382,3402,3410,3434,2579,2579,2369],
['pv2', 1750,1750,1750,1750,1825,1850,1975,2150,2375,2425,2475,2500,2500,2087,2087,2087,2087,2091,2087,1767,1767,1767,1633,1498,1498,1642,1637,1633,1609,1841,1713,1702,1862,1888,1888,1888,1949,1976,1977,2014,2014,2014,1946,1966,1973,2224,2252,2318,2318,2318,2327,2373,2513,2535,2543,2534,2539,2823,2849,2990,3142,3142,3108,2513,2687,2678,2856,2860,2861,2862,2866,2869,2870,2875,2874,2874,2874,2879,2885,2886,2883,2889,2896,2895,2899,2903,2909,2911,2913,2913,2913,2916,2922,2933,2937,2943,2942,2943,2947,1811,1826,1837,1840,1840,1841,1843,1511,1854,1853,1851,1852,1853,1849,1852,1874,1857,1883,1886,1888,1904,1903,1924,1947,2060,2068,2068,2082,1582,1344,836,839,788]
],
type: 'bar'
},
axis: {
x: {
type: 'category',
tick: {
rotate: -60,
multiline: false
},
height: 130
}
}
});
Can anyone please tell me some solution for this
What I did to solve it
I have used timeseries type instead of category type, after that the label issue got resolved but the graph was been plottted with more white spaces for the month of march like as shown below
Working JSFiddle

You can use c3's tick count setting for this, so here we say 20 labels.
However there is an added gotcha in that ticks that now resolve to a fractional category value won't show - i.e. the 2nd equally spaced tick out of 20 may be the 2.6667th element in the x category axis - so you need to have a little format function that adjusts for this, otherwise you just get the end and start labels. (Or you could figure out a tick count that divides into your data count + 1 as a whole number.)
tick: {
format: function (x) {
var cats = this.api.categories();
return cats[Math.round(x)];
},
count: 20,
rotate: -60,
multiline: false
},
http://jsfiddle.net/fz0t10yb/7/

One of the possible solution could be to use x-axis labels at required indexes only & leaving others blank.
['x', "2016-04-01","","","","2016-04-29","","","",...]
['pv1', 2500,2500,2500,2500,2500,2500,2500,2500,...]
['pv2', 1750,1750,1750,1750,1825,1850,1975,2150,...]
You can position labels so that it would capture the date and at same time it looks good also.

Limit labels number on Chart.js line chart

I want to display all of the points on my chart from the data I get, but I don't want to display all the labels for them, because then the chart is not very readable. I was looking for it in the docs, but couldn't find any parameter that would limit this.
I don't want to take only three labels for example, because then the chart is also limited to three points. Is it possible?
I have something like that right now:
If I could just leave every third-fourth label, it would be great. But I found absolutely nothing about labels options.

Try adding the options.scales.xAxes.ticks.maxTicksLimit option:
xAxes: [{
type: 'time',
ticks: {
autoSkip: true,
maxTicksLimit: 20
}
}]

For concreteness, let's say your original list of labels looks like:
["0", "1", "2", "3", "4", "5", "6", "7", "8"]
If you only want to display every 4th label, filter your list of labels so that every 4th label is filled in, and all others are the empty string (e.g. ["0", "", "", "", "4", "", "", "", "8"]).

For anyone looking to achieve this on Chart JS V2 the following will work:
var options = {
scales: {
xAxes: [{
afterTickToLabelConversion: function(data){
var xLabels = data.ticks;
xLabels.forEach(function (labels, i) {
if (i % 2 == 1){
xLabels[i] = '';
}
});
}
}]
}
}
Then pass the options variable as usual into a:
myLineChart = new Chart(ctx, {
type: 'line',
data: data,
options: options
});`

UPDATE:
I'v updated my fork with the latest pull (as of Jan 27, 2014) from NNick's Chart.js master branch.
https://github.com/hay-wire/Chart.js/tree/showXLabels
ORIGINAL ANSWER:
For those still facing this issue, I forked Chart.js a while back to solve the same problem. You can check it out on:
https://github.com/hay-wire/Chart.js/tree/skip-xlabels => Older branch! Check showXLabels branch for latest pull.
How to use:
Applicable to bar chart and line chart.
User can now pass a { showXLabels: 10 } to display only 10 labels (actual displayed labels count might be a bit different depending on the number of total labels present on x axis, but it will still remain close to 10 however)
Helps a lot when there is a very large amount of data. Earlier, the graph used to look devastated due to x axis labels drawn over each other in the cramped space. With showXLabels, user now has the control to reduce the number of labels to whatever number of labels fit good into the space available to him.
See the attached images for a comparison.
Without showXLabels option:
With { showXLabels: 10 } passed into option:
Here's some discussion on it:
https://github.com/nnnick/Chart.js/pull/521#issuecomment-60469304

For Chart.js 3.3.2, you can use #Nikita Ag's approach with a few changes. You can check the documentation. Put ticks in xAxis in scales. Example:
...
options: {
scales: {
xAxis: {
ticks: {
maxTicksLimit: 10
}
}
}
}
...

for axis rotation
use this:
scales: {
xAxes: [
{
// aqui controlas la cantidad de elementos en el eje horizontal con autoSkip
ticks: {
autoSkip: true,
maxRotation: 0,
minRotation: 0
}
}
]
}

In Chart.js 3.2.0:
options: {
scales: {
x: {
ticks: {
maxTicksLimit: 10
}
}
}
}

According to the chart.js github issue #12. Current solutions include:
Use 2.0 alpha (not production)
Hide x-axis at all when it becames too crowd (cannot accept at all)
manually control label skip of x-axis (not in responsive page)
However, after a few minutes, I thinks there's a better solution.
The following snippet will hide labels automatically. By modify xLabels with empty string before invoke draw() and restore them after then. Even more, re-rotating x labels can be applied as there's more space after hiding.
var axisFixedDrawFn = function() {
var self = this
var widthPerXLabel = (self.width - self.xScalePaddingLeft - self.xScalePaddingRight) / self.xLabels.length
var xLabelPerFontSize = self.fontSize / widthPerXLabel
var xLabelStep = Math.ceil(xLabelPerFontSize)
var xLabelRotationOld = null
var xLabelsOld = null
if (xLabelStep > 1) {
var widthPerSkipedXLabel = (self.width - self.xScalePaddingLeft - self.xScalePaddingRight) / (self.xLabels.length / xLabelStep)
xLabelRotationOld = self.xLabelRotation
xLabelsOld = clone(self.xLabels)
self.xLabelRotation = Math.asin(self.fontSize / widthPerSkipedXLabel) / Math.PI * 180
for (var i = 0; i < self.xLabels.length; ++i) {
if (i % xLabelStep != 0) {
self.xLabels[i] = ''
}
}
}
Chart.Scale.prototype.draw.apply(self, arguments);
if (xLabelRotationOld != null) {
self.xLabelRotation = xLabelRotationOld
}
if (xLabelsOld != null) {
self.xLabels = xLabelsOld
}
};
Chart.types.Bar.extend({
name : "AxisFixedBar",
initialize : function(data) {
Chart.types.Bar.prototype.initialize.apply(this, arguments);
this.scale.draw = axisFixedDrawFn;
}
});
Chart.types.Line.extend({
name : "AxisFixedLine",
initialize : function(data) {
Chart.types.Line.prototype.initialize.apply(this, arguments);
this.scale.draw = axisFixedDrawFn;
}
});
Please notice that clone is an external dependency.

i had a similar type of issue, and was given a nice solution to my specific issue show label in tooltip but not in x axis for chartjs line chart. See if this helps you

you can limit at as
scales: {
x: {
ticks: {
// For a category axis, the val is the index so the lookup via getLabelForValue is needed
callback: function(val, index) {
// Hide the label of every 2nd dataset
return index % 5 === 0 ? this.getLabelForValue(val) : '';
},
}
}
}
this will skip 4 labels and set the 5th one only.

you can use the following code:
xAxes: [{
ticks: {
autoSkip: true,
maxRotation: 90
}
}]

You may well not need anything with this new built-in feature.
A built-in label auto-skip feature detects would-be overlapping ticks and labels and removes every nth label to keep things displaying normally. https://www.chartjs.org/docs/latest/axes/

To set a custom number of ticks regardless of your chartsjs version:
yAxes: [{
ticks: {
stepSize: Math.round((Math.max.apply(Math, myListOfyValues) / 10)/5)*5,
beginAtZero: true,
precision: 0
}
}]
10 = the number of ticks
5 = rounds tick values to the nearest 5. All your y values will have the same step size.
Similar will work for xAxes too.

This answer works like a charm.
If you are wondering about the clone function, try this one:
var clone = function(el){ return el.slice(0); }

In the Chart.js file, you should find (on line 884 for me)
var Line = function(...
...
function drawScale(){
...
ctx.fillText(data.labels[i], 0,0);
...
If you just wrap that one line call to fillText with if ( i % config.xFreq === 0){ ... }
and then in chart.Line.defaults add something line xFreq : 1 you should be able to start using xFreq in your options when you call new Chart(ctx).Line(data, options).
Mind you this is pretty hacky.

Highcharts blank chart with x and y axis

I want to use highcharts creating a blank chart with no datas but x and y axis.
How to do it?
var chart = new Highcharts.Chart({
chart: {
renderTo: 'container'
},
yAxis: {
labels: {
formatter: function() {
return this.value +' km';
}
}
},
series: [{
data: []
}]
});
it returns
But I want to display y-axis with label.

You can put in your min/max values for the xAxis and yAxis and use null for all data.
Forked from #ZaheerAhmed's response above as I figure it deserves a spot as an alternative solution without needing to hide the data after the fact.
i.e.
yAxis: {
min: 1,
max:
} ,
xAxis: {
min: 1,
max: 50
},
series: {
data:[null,null]
}

You can put data and hide the series after setting property
ignoreHiddenSeries : false
Here is Working Demo If you hide the series Y-Axis will still be visible.

FWIW, it seems that highcharts has this functionality built in yAxis.showEmpty
Unfortunately, the fiddle listed in the documentation doesn't work, and there is a related open highcharts issue on the matter:
no hide y axis

Setting min and max for xAxis and yAxis is not a good solution! Because if the data is loaded later (When it's resolved), then you won't have auto calculated min and max. In Highcharts API, it's said:
If null, the max value is automatically calculated
So you should set min and max back to null when the data is loaded. But in my case setting it to null or even deleting the option, didn't result in automatic calculating (Seems strange).
What I did instead was setting charts.showAxes to true! That's it. Take a look at the demo provided by Highcharts
Important: You of course need to set series to something like this:
series: [
{
data: [null, null, null]
},
{
data: [null, null, null]
}
]
Note: Make sure xAxis.showEmpty and yAxis.showEmpty are set true (which is true by default).