I am trying to make a chart which has years along the x-axis and dollar amounts along the y-axis. I finally got close to what I'm looking for, but I found that because the x coordinates are numbers, ChartJS is putting commas in them which looks really strange for years.
After some digging, I used the callbacks. options.plugin.tooltip.callbacks.label worked to let me remove commas in the tooltips, but when I use options.scales.x[0].ticks.callback to try to fix the labels on the bottom, not only does it not work, but I don't see the console.log statement in their ever being printed so it seems it's not even calling the callback. I've tried several variations of how to do the callback based on what I found online and on Stack Overflow which I think correspond to the different ways ChartJS did this in different versions. (I'm on version 3.5.1.)
Then, I realized that... none of the options under options.scales appear to have any effect. I change the min, the title, the tick settings (color to red, callback, etc.) and it has no effect. (This also explains why I was having trouble when using the line chart and had to switch to scatter; apparently type: 'linear' wasn't being picked up nor did it do anything different when I set it to type: 'date' or whatever the exact working was for that.)
Meanwhile, the other options like options.showLine or options.elements do have an effect and I'm seeing the chart and not getting any errors in the console. So, it is picking up the options, just ignoring everything I have in options.scales.
Here is the relevant code:
// Sample data added to make this example self-contained
// This is my internal data format
let data = {
"Series1": [ {x: 2001, y: 100 }, {x: 2002, y: 110 }, {x: 2003, y: 107 }, ],
"Series2": [ {x: 2001, y: 107 }, {x: 2002, y: 102 }, {x: 2004, y: 95 }, ],
}
// Define data //////////////////////////////////////////////////////
// I convert data to format ChartJS wants and add a few options
let datasets = [];
for(let label in data) {
let c = colorIterator.next().value
datasets.push({
label: label,
data: data[label],
backgroundColor: c,
borderColor: c,
});
}
// Define options //////////////////////////////////////////////////////
let chartConfig = {
type: 'scatter',
data: { datasets: datasets, },
options: {
title: { display: false },
indexAxis: 'x', responsive: true, maintainAspectRatio: false,
showLine: true,
elements: {
line: { display: true, tension: 0, borderWidth: 1, fill: false, },
point: { radius: 3 }
},
interaction: { mode: 'x', },
scales: {
x: [{
type: 'linear',
min: 1995, max: (new Date()).getFullYear()+1, stepSize: 1,
title: { display: true, text: 'Year' },
ticks: {
display: true,
major: { enabled: true },
color: 'red',
callback: function(value, index, ticks) {
console.log(value);
return Chart.Ticks.formatters.numeric.apply(this, [value, index, ticks])
.replace(",","");
}
}
}],
y: [{
title: { display: true, text: '$' },
ticks: {
display: true,
color: 'red',
},
}],
},
plugins: {
tooltip: {
callbacks: {
label: function(context) {
let label = context.dataset.label || '';
if(label) {
let x = context.label.replace(",","");
let y = context.formattedValue;
return 'Year ' + x + ' "' + label + '": $' + y;
} else { return 'x'; }
},
},
},
},
}
};
// MAKE CHART //////////////////////////////////////////////////////
let mainChart = new Chart(document.getElementById(c.id), chartConfig);
As described in the docs the scales are not arrays. All the scales are objects in the scale object.
So you will need to change your code to this:
options: {
scales: {
x: {
// x options
},
y: {
// y options
},
}
}
Related
How can I move my labels on my x axes in between another x axes label. Nothing seems to work and I was unable to find anything on the docs. Is there a workaround? I'm using line chart time series.
https://www.chartjs.org/samples/latest/scales/time/financial.html
Currently, with the code I have its generating the figure below:
var cfg = {
elements:{
point: {
radius: 4
}
},
data: {
datasets: [
{
label: 'vsy',
backgroundColor: color(window.chartColors.red).alpha(0.5).rgbString(),
borderColor: window.chartColors.red,
data: firstData,
type: 'line',
pointRadius: 2,
fill: false,
lineTension: 0,
borderWidth: 2
},
{
label: 'de vsy',
backgroundColor: color(window.chartColors.blue).alpha(0.5).rgbString(),
borderColor: window.chartColors.blue,
data: dataMaker(15),
type: 'line',
pointRadius: 2,
fill: false,
lineTension: 0,
borderWidth: 2
}
],
},
options: {
animation: {
duration: 0
},
scales: {
xAxes: [{
type: 'time',
distribution: 'series',
offset: true,
time: {
unit: 'month',
displayFormats: {
month: 'MMM'
}
},
ticks: {
autoSkip: true,
autoSkipPadding: 75,
sampleSize: 100
},
}],
yAxes: [{
gridLines: {
drawBorder: false
}
}]
},
tooltips: {
intersect: false,
mode: 'index',
}
}
};
This is what I have now:
I want the labels on the x-axis to be on center instead of below the y axis grid line.
Thanks to uminder, with his comment it solves the issue but now I have a conflicting tooltip which lie on a same grid. When I hover to april line first point it shows me mar 30 which lies just above it and vice versa.
I fixed it by changing the mode to nearest but why is it activating the another point?
The option you're looking for is offsetGridLines.
If true, grid lines will be shifted to be between labels.
xAxes: [{
...
gridLines: {
offsetGridLines: true
}
In most cases, this produces the expected result. Unfortunately it doesn't work for time axes as documented in Chart.js issue #403. Thanks to Antti Hukkanen, there exists a workaround.
Please have a look at below runnable code snippet to see how it works.
function generateData() {
var unit = 'day';
function randomNumber(min, max) {
return Math.random() * (max - min) + min;
}
function randomPoint(date, lastClose) {
var open = randomNumber(lastClose * 0.95, lastClose * 1.05).toFixed(2);
var close = randomNumber(open * 0.95, open * 1.05).toFixed(2);
return {
t: date.valueOf(),
y: close
};
}
var date = moment().subtract(1, 'years');
var now = moment();
var data = [];
for (; data.length < 600 && date.isBefore(now); date = date.clone().add(1, unit).startOf(unit)) {
data.push(randomPoint(date, data.length > 0 ? data[data.length - 1].y : 30));
}
return data;
}
var TimeCenterScale = Chart.scaleService.getScaleConstructor('time').extend({
getPixelForTick: function(index) {
var ticks = this.getTicks();
if (index < 0 || index >= ticks.length) {
return null;
}
// Get the pixel value for the current tick.
var px = this.getPixelForOffset(ticks[index].value);
// Get the next tick's pixel value.
var nextPx = this.right;
var nextTick = ticks[index + 1];
if (nextTick) {
nextPx = this.getPixelForOffset(nextTick.value);
}
// Align the labels in the middle of the current and next tick.
return px + (nextPx - px) / 2;
},
});
// Register the scale type
var defaults = Chart.scaleService.getScaleDefaults('time');
Chart.scaleService.registerScaleType('timecenter', TimeCenterScale, defaults);
var cfg = {
data: {
datasets: [{
label: 'CHRT - Chart.js Corporation',
backgroundColor: 'red',
borderColor: 'red',
data: generateData(),
type: 'line',
pointRadius: 0,
fill: false,
lineTension: 0,
borderWidth: 2
}]
},
options: {
animation: {
duration: 0
},
scales: {
xAxes: [{
type: 'timecenter',
time: {
unit: 'month',
stepSize: 1,
displayFormats: {
month: 'MMM'
}
},
gridLines: {
offsetGridLines: true
}
}],
yAxes: [{
gridLines: {
drawBorder: false
}
}]
},
tooltips: {
intersect: false,
mode: 'index'
}
}
};
var chart = new Chart('chart1', cfg);
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.18.1/moment.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.9.3/Chart.min.js"></script>
<canvas id="chart1" height="90"></canvas>
For chartJs v3 you can use offset property:
scales: {
x: {
grid: {
offset: true
}
},
...
}
I have datasets with x, y values x denotes date y denotes values.and i have successfully generated a chart. look at the pic attached below
I'm using this code to generate the chart (generated using the above chart)
var config = {
type: 'scatter',
data: {
//labels: this.HoursStrings,
datasets: [{
data: yserires, // example data [{x:2019/01/02,y:12},{x:2019/01/02,y:12}}]
fill: true,
borderColor: "#3e82f7",
yAxesGroup: "1"
}]
},
options: {
responsive: true,
title: {
display: false,
},
legend: {
display: false
},
showLines: true,
tooltips: {
mode: 'index',
intersect: true,
callbacks: {
label: function (tooltipItem, data) {
var value = data.datasets[0].data[tooltipItem.index];
var day = moment(new Date(value.x)).format(self.timeformat);
var point = value.y + " " + self.unityType
return point;
}
} //
},
hover: {
mode: 'nearest',
intersect: true
},
scales: {
xAxes: [{
display: true,
type: 'time',
time: {
unit: self.timeUnit
},
ticks: {
beginAtZero: true
}
}],
yAxes: [{
display: true,
ticks: {
beginAtZero: true,
userCallback: function (value, index, values) {
return self.roundValues(value) + " " + self.unityType
}
}
}]
},
elements: {
line: {
tension: .1, // bezier curves
}
}
}
};
setTimeout(() => {
var ctx = document.getElementById("canvas");
this.chart = new Chart(ctx, config);
this.chart.update()
}, 50)
Expected Result
how can group different y-axis values against the same x-axis values (should be one single value like the average of y-axis) is there any build in functions available in chart js or I need to group those value before binding the chart.
Note: The date should be grouped (averaged) by day/hour/week/month
like below image
You can preprocess your array getting the mean value from the data before feeding it to the graph:
// Your data array
let array = [{ x: '2019/01/02', y: 12 }, { x: '2019/01/02', y: 13 }]
// The output data for Chart js
var output = [];
// Get the non-unique values and add them to an array
array.forEach(function (item) {
var existing = output.filter(function (v, i) {
return v.x == item.x;
});
if (existing.length) {
var existingIndex = output.indexOf(existing[0]);
if (!Array.isArray(output[existingIndex].y))
output[existingIndex].y = [output[existingIndex].y]
output[existingIndex].y = output[existingIndex].y.concat(item.y);
} else {
if (typeof item.value == 'string')
item.value = [item.value];
output.push(item);
}
});
// Compute the mean
console.dir(output.map(val => {
val.y = (val.y).reduce((a, b) => a + b, 0) / (val.y).length
return val
}));
I am not familiar with chart js, but from my experience with D3 and time series visualization in general, the result you are seeing is the expected behavior. I.e. the time series visualization is constructed as a continuous line intersecting all data points, in the order the data points are specified.
So to answer your question about grouping, I would say yes, you need to group the data yourself before creating a chart.
First, however, you need to consider what grouping means - is it an average, a sum, a minimum, a maximum, or something different. I'm guessing you'll want an average, but it will depend on your use case and analysis needs.
I've written a short bit of code, that groups an array of entries by calculating the average of reoccurring x values:
const data = [
{ x: '2019/01/28', y: 19 },
{ x: '2019/01/29', y: 15 },
{ x: '2019/02/02', y: 12 },
{ x: '2019/02/02', y: 13 },
{ x: '2019/02/02', y: 14 },
{ x: '2019/02/02', y: 15 },
{ x: '2019/02/02', y: 18 },
{ x: '2019/02/02', y: 21 },
]
const dataGrouper = {}
data.forEach((dataPoint) => {
if (!dataGrouper[dataPoint.x]) {
dataGrouper[dataPoint.x] = []
}
dataGrouper[dataPoint.x].push(dataPoint)
})
const groupedData = []
Object.keys(dataGrouper).forEach((groupingKey) => {
const sum = dataGrouper[groupingKey].reduce((accumulator, currentValue) => {
return accumulator + currentValue.y
}, 0)
groupedData.push({
x: groupingKey,
y: sum / dataGrouper[groupingKey].length
})
})
console.log({groupedData})
I created a bubble chart using ChartJs and populating data dynamically using Json.
See the code below.
for (var i = 0; i < response.data.length; i++) {
var point_data = [];
point_data.push({
x: response.data[i]['return_tickets'].toString(),
y: Math.round(response.data[i]['return_percentage']).toString(),
r: Math.round((response.data[i]['return_percentage'])).toString()
});
data.push({ label: response.data[i]['staff_name'], data: point_data, backgroundColor: getRandomColor(), hoverRadius:4 });
}
new Chart(document.getElementById("bubbleChart"), {
type: 'bubble',
data: {
datasets: data
},
options: {
title: {
display: true,
text: ''
}, scales: {
yAxes: [{
scaleLabel: {
display: true,
labelString: "Return Tickets %"
}
}],
xAxes: [{
scaleLabel: {
display: true,
labelString: "Return Tickets"
}
}]
}
}
});
It generates the desired chart as below
The problem is when I hover over any bubble the size of the bubble increases exponentially.
How to keep the size same ?
I'm setting the hoverRadius property of the dataset but it does nothing for me.
Problem is with your this line of code:
{ label: response.data[i]['staff_name'], data: point_data, backgroundColor: getRandomColor(), hoverRadius:4 }
This is not a valid JSON. Values must be either strings or arrays. Most probably issue is at label: response.data[i]['staff_name'] or in point_data (I can see you are making x, y and r values .toString() that maybe not required). Check it again. Create a valid JSON and then try by setting hoverRadius: 0, it will work.
Setting hoverRadius: 0 working fine for me. Bubble size will not change on mouse over if you set hoverRadius: 0.
Below is working example:
var chart = new Chart(ctx, {
type: 'bubble',
data: {
datasets: [{
label: 'Bubble',
data: [{
x: 5,
y: 55,
r: 27.5
}],
backgroundColor: 'rgba(0, 119, 290, 0.6)',
hoverRadius: 0
}]
},
options: {
tooltips: {
callbacks: {
label: function(t, d) {
return d.datasets[t.datasetIndex].label +
': (Day:' + t.xLabel + ', Total:' + t.yLabel + ')';
}
}
}
}
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.7.2/Chart.min.js"></script>
<canvas id="ctx"></canvas>
Checkout official documentation for more info : https://www.chartjs.org/docs/latest/charts/bubble.html#dataset-properties
I have already faced the same issue also fixed it by typecasting for every x,y & z. I just convert it to float
'x' => (float) $x_axis_value,
'y' => (float) $y_axis_value,
'r' => (float) $radious_value,
I have used a Bubble Chart on Chart.js to create sliders to show comparable performance and they currently look a bit like this:
What am I trying to do
I want to add data labels just above / in my 'bubbles' with my values in. Much like the '10' you can see on each bubble here.
What have I done to achieve this
This is not standard Chart.js functionality but I found this post which was discussing a similar issue for bar / line charts.
I've installed the plugin that post suggested but the data label it shows is for the radius of the bubble and I want to it to be the x-axis of the bubble.
I've also tried to use the code from some of the answers on that post, but with absolutely no luck.
My Code
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.7.0/Chart.bundle.js"></script>
<script src="https://cdn.jsdelivr.net/npm/chartjs-plugin-datalabels"></script>
<div class="container" >
<h2>Chart.js — Line Chart Demo</h2>
<div>
<canvas id="myChart"></canvas>
</div>
</div>
<script>
var ctx = document.getElementById('myChart').getContext('2d');
ctx.height = 1000;
var myChart = new Chart(ctx, {
type: 'bubble',
data: {
datasets: [
{
label: 'Your Data',
data: [
{x: 78.7, y: 0, r: 10, name: "Performance"}
],
backgroundColor: "rgba(153,255,51,0.6)"
},
{
label: 'Average',
data: [
{x: 100.7, y: 0, r: 10, name: "Performance"} // The labe needs to be X. not R.
],
backgroundColor: "rgba(255,0,128,0.6)"
}
]
},
options: {
maintainAspectRatio: false,
scales: {
yAxes: [{
id: 'first-y-axis',
type: 'linear',
ticks: {
min: 0,
max: 1,
stepSize: 1,
display: false
},
gridLines: {
display: false,
drawBorder: false
}
}],
xAxes: [{
ticks: {
min: 50, // Controls where axis starts
max: 120 // Controls where axis finishes
},
gridLines: {
display: false,
lineWidth: 3 // Width of bottom line
}
}]
}
}
});
</script>
Thanks in advance
I've managed to find the answer to this question, basically by taking apart the bubble chart example from the chartjs-plugin-datalabels plugin.
Below is a working example. Pay attention to the section in options that says 'plugin'.
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.7.0/Chart.bundle.js"></script>
<script src="https://cdn.jsdelivr.net/npm/chartjs-plugin-datalabels"></script>
<div class="container" >
<h2>Chart.js — Line Chart Demo</h2>
<div>
<canvas id="myChart"></canvas>
</div>
</div>
<script>
var ctx = document.getElementById('myChart').getContext('2d');
ctx.height = 1000;
var myChart = new Chart(ctx, {
type: 'bubble',
data: {
datasets: [
{
label: 'Your Data',
data: [
{x: 78.7, y: 0, r: 10, name: "Performance"}
],
backgroundColor: "rgba(153,255,51,0.6)"
},
{
label: 'Average',
data: [
{x: 100.7, y: 0, r: 10, name: "Performance"} // The labe needs to be
],
backgroundColor: "rgba(255,0,128,0.6)"
}
]
},
options: {
plugins: { // Look at this bit
datalabels: {
anchor: function(context) {
var value = context.dataset.data[context.dataIndex];
return value.x < 50 ? 'end' : 'center';
},
align: function(context) {
var value = context.dataset.data[context.dataIndex];
return value.x < 50 ? 'end' : 'center';
},
color: function(context) {
var value = context.dataset.data[context.dataIndex];
return value.x < 50 ? context.dataset.backgroundColor : 'white';
},
font: {
weight: 'bold'
},
formatter: function(value) {
return Math.round(value.x);
},
offset: 2,
padding: 0
}
},
maintainAspectRatio: false,
scales: {
yAxes: [{
id: 'first-y-axis',
type: 'linear',
ticks: {
min: 0,
max: 1,
stepSize: 1,
display: false
},
gridLines: {
display: false,
drawBorder: false
}
}],
xAxes: [{
ticks: {
min: 50, // Controls where axis starts
max: 120 // Controls where axis finishes
},
gridLines: {
display: false,
lineWidth: 3 // Width of bottom line
}
}]
}
}
});
</script>
If all you want to do is changing the label, there is an easier solution. From the docs of chartjs-plugin-datalabels:
Data values are converted to string ('' + value). If value is an object, the following rules apply first:
value = value.label if defined and not null
else value = value.r if defined and not null
else value = 'key[0]: value[key[0]], key[1]: value[key[1]], ...'
Therefore, it is sufficient to specify a label in your data points:
data: [{ x: 78.7, y: 0, r: 10, name: "Performance", label: `${Math.round(x)}` }],
I there any easy way to load the data in the heatmap with dates on "Y".
My data is in the following format:
[{x:1, y: 1401292253, value:0.2, name:"a"},{x:2, y: 1401173762, value:0.3, name:"b"},{x:0, y: 1401173462 , value:0.6, name:"c"}]
I want Y of the heatmap to be build automatically based on the given value. But I cant figure out how to do it.
What I've tried is:
http://jsfiddle.net/tZ6GP/16/
You need to set rowsize (or colsize for xAxis) to tell highcharts what is the range for each point. Otherwise it will be 1ms which is really low value. Second thing is that your y-values are in seconds, while in JS timestamps are in ms.
When changed that two things, you will get nice chart: http://jsfiddle.net/tZ6GP/19/
series: [{
rowsize: 3600000, // one hour
data: [{
x: 0,
y: 1401292253000,
value: 0.2,
name: "a"
}, {
x: 1,
y: 1401173762000,
value: 0.3,
name: "b"
}, {
x: 2,
y: 1401173462000,
value: 0.6,
name: "c"
}]
}]
To do this you have to treat your yAxis as categories still but then apply a label.format. This should get you started:
xAxis: {
type: 'category',
categories: ['a', 'b', 'c']
},
yAxis: {
type: 'category',
categories: ['1401292253', '1401173762', '1401173462'],
labels: {
format: '{value: %H:%M:%S}'
}
}
I also cleaned up your series.data a bit. Basically you need to give the matrix coordinates (x/y) and the value.
series: [{
data: [{
x: 1,
y: 0,
value: 0.2
}, {
x: 2,
y: 1,
value: 0.3
}, {
x: 0,
y: 2,
value: 0.6
}]
}]
By looking at this you can make out the locations of your points.
Live demo.
Update for latest highcarts code. You need to modify the yAxis label formatter:
yAxis: {
categories: ['1401292253', '1401173762', '1401173462'],
labels: {
formatter: function () {
var theTime = parseFloat(this.value);
return Highcharts.dateFormat('%H:%M:%S', theTime);
}
}
},
Update live demo.