Related
so I'm basically pulling my hair as I can't get this to work for hours straight.
I'm trying to do a (I assumed simple) line-graph with on the x-axis time of day in hours and on the y-axis number of views. I'm trying to set the x-axis range as -24 hours until now.
My code is as follows. What am I doing wrong?
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.7.3/Chart.bundle.min.js"></script>
<div style="width: 500px; height: 500px;"><canvas id="myChart" width="400" height="400"></canvas></div>
<script>
var ctx = document.getElementById('myChart');
var myChart = new Chart(ctx, {
type: 'line',
data: {
labels: [],
datasets: [{
label: '# of Votes',
data: [{x:'1619701200',y:41},{x:'1619704800',y:9},{x:'1619708400',y:21}]
}]
},
options: {
scales: {
x: {
type: 'time',
min: Date.now() - (24 * 60 * 60 * 1000),
max: Date.now()
}
}
}
});
</script>
EDIT: the problem is that the x-axis doesn't extend to 24 hours prior to now(). Also, there are 3 values in the dataset, but only two are shown. You can even edit the x-values to whatever you want and the entire graph stays the same.
EDIT2:
Could someone help me get this right? I've pasted my data below:
What I am trying to achieve:
X-axis going from now until 24 hours prior with an interval of 1 hour between ticks, formatted as 'd-m-Y H:00:00'. The data now is in seconds since epoch, if I need to change that please let me know!
Y-axis going from 0 to whatever the max is in the dataset
What CDNs do I have to include? I find the documentation on chart.js, moments, adapters etc quite unclear and everything I find on the internet is for prior versions.
Thank you!!
<div style="width: 500px; height: 500px;"><canvas id="myChart" width="400" height="400"></canvas></div>
<script>
new Chart(document.getElementById("myChart"), {
type: 'line',
data: {
labels: ['1619701200','1619704800','1619708400','1619715600','1619719200','1619722800','1619726400','1619730000','1619733600','1619737200','1619744400','1619773200','1619780400','1619784000','1619787600','1619791200','1619794800','1619798400','1619802000','1619809200','1619812800','1619816400','1619820000','1619823600','1619856000'],
datasets: [{
data: [41,9,21,80,277,151,68,88,82,48,12,1,97,36,81,21,63,49,44,15,10,44,81,4,9],
label: "Views",
borderColor: "#3e95cd",
fill: false
},
{
data: [1,1,2,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,2,4,1,1],
label: "Visitors",
borderColor: "#3e95cd",
fill: false
}
]
}
</script>
We want you to keep your hair :-)
Try the following 2 Options for latest version of Chart.js
Chart.js v3.2.1 (not backwards compatible with v2.xx)
Option 1:
<script src="https://cdn.jsdelivr.net/npm/chart.js"></script>
// gets you the latest version of Chart.js, now at v3.2.1
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.29.1/moment.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/chartjs-adapter-moment"></script>
// You need moment.js and adapter for time or timeseries to work at x-Axis
<div style="width: 500px; height: 500px">
<canvas id="myChart" width="400" height="400"></canvas>
</div>
<script>
const startDate = new Date(1619701200*1000);
// first label from your data, times 1000 to get milliseconds,
// for last 24 hours from now, see further down below
const myLabels = [];
let nextHour = startDate;
let i = 0; // tip: declare i outside for-loop for better performance
for (i; i < 24; i++) {
nextHour = new Date((1619701200 + (i*3600)) *1000);
myLabels.push(nextHour);
};
const ctx = document.querySelector('canvas').getContext('2d');
const myChart3x = new Chart(ctx, {
type: 'line',
data: {
labels: myLabels,
datasets: [{
data: [41,9,21,80,277,151,68,88,82,48,12,1,97,36,81,21,63,49,44,15,10,44,81,4,9],
label: "Views",
borderColor: "#3e95cd",
fill: false
},
{
data: [1,1,2,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,2,4,1,1],
label: "Visitors",
borderColor: "#3e95cd",
fill: false
}
]
},
options: {
scales: {
x: {
type: 'timeseries',
time: {
unit: 'hour', // <-- that does the trick here
displayFormats: {
hour: 'D-M-Y H:00:00'
},
tooltipFormat: 'D-M-Y H:00:00' // <-- same format for tooltip
}
},
y: {
min: 0
}
}
}
});
</script>
And this is what your chart would look like:
If you want to calculate dynamically the last 24 hours from now for your x-Axis, I would suggest to use moment.js instead:
<script>
// ...
const startDate = moment().subtract(1, 'd');
const myLabels = [];
let nextHour = startDate;
let i = 0;
for (i; i < 24; i++) {
nextHour = moment().add(i, 'h');
myLabels.push(nextHour);
};
// ....
</script>
Also, be aware that moment.js uses slightly different formatting string:
'D-M-Y H:00:00' instead of 'd-m-Y H:00:00'
Option 2:
If you have your data in json-format
data: [{x:1620237600000,y:41},{x:1620241200000,y:9},{x:1620244800000,y:21}]
like your first code snippet on top, using min and max at x-Axis: (Advantage: you don't have to define labels-array for x-Axis)
<script>
const ctx = document.querySelector("canvas").getContext("2d");
var myChart = new Chart(ctx, {
type: "line",
data: {
datasets: [{
label: "Views",
data: [{x:1620237600000,y:41},{x:1620241200000,y:9},{x:1620244800000,y:21}]
// x-value without quotes (has to be a number)
// and multiply by 1000 to get milliseconds
},
{
label: "Visitors",
data: [{x:1620237600000,y:1},{x:1620241200000,y:1},{x:1620244800000,y:2}]
}]
},
options: {
scales: {
x: {
type: "time", // <-- "time" instead of "timeseries"
min: Date.now() - (24 * 60 * 60 * 1000),
max: Date.now(),
time: {
unit: "hour", // <-- that does the trick here
displayFormats: {
hour: "D-M-Y H:00:00"
},
tooltipFormat: "D-M-Y H:00:00"// <-- same format for tooltip
}
},
y: {
min: 0,
max: 100
}
}
}
});
</script>
You should get the following:
I hope I understood correctly your need and hope this helps.
It needs more settings, I've searched and by trial/error - credit to this jsfiddle - , these are the results.
See updated working jsfiddle:
/*
Source: https://jsfiddle.net/microMerlin/3wfoL7jc/
*/
var ctx = document.getElementById('myChart');
var myChart = new Chart(ctx, {
type: 'line',
data: {
datasets: [{
label: '# of Votes',
data: [{
x: '1619701200',
y: 41
}, {
x: '1619704800',
y: 9
}, {
x: '1619708400',
y: 21
}]
}]
},
options: {
responsive: true,
scales: {
xAxes: [{
min: Date.now() - (24 * 60 * 60 * 1000),
max: Date.now(),
type: "linear",
position: "bottom",
//stacked: true,
ticks: {
//beginAtZero: true,
userCallback: function(t, i) {
/*console.log("t: " + t.toString());
console.log("i: " + i.toString());*/
return i;
}
}
}]
}
}
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.7.3/Chart.bundle.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div style="width: 500px; height: 500px;"><canvas id="myChart" width="400" height="400"></canvas></div>
I'm creating graphs using chart js V 2.9.3.
When I create the graph with a small amount of data it renders data perfectly but when the amount of data is increasing, the chart becomes Crowded.
A graph has two columns in single label.
I'm also not able to set the labels without rotation.
var config = {
type: 'bar',
data: {
labels: _datesForLabel,
datasets: _chartDataWithOptions,
},
options: {
tooltips: {
},
plugins: {
colorschemes: {
scheme: 'office.Waveform6'
}
},
scales: {
yAxes: [{
ticks: {
min: 0,
}
}],
xAxes: [{
barThickness: 40,
maxBarThickness: 40,
barPercentage: 1.0,
categoryPercentage: 1.0,
ticks: {
min: 0,
},
}]
}
}
};
myBarChart = new Chart(ctx, config);
These are the options I used.
given is the screenshot of the output
output Image
can anyone help me with this.
thank you
Remove this barThickness: 40, (40 in pixels). In your case "No space/room" for such width = overlaps & broken layout.
https://www.chartjs.org/docs/latest/charts/bar.html#barthickness
Basic snippet (Base on your code) (change barThickness barPercentage barPercentage):
https://www.chartjs.org/docs/latest/charts/bar.html#barpercentage-vs-categorypercentage
var canvas = document.getElementById("myChart");
var ctx = canvas.getContext("2d");
var _datesForLabel = ["2020-02-10",
"2020-02-13",
"2020-02-17",
"2020-02-18",
"2020-02-19",
"2020-02-20",
"2020-02-21",
"2020-02-22",
"2020-02-23",
"2020-02-24",
"2020-02-25",
"2020-02-26",
"2020-02-27",
"2020-02-28",
"2020-02-29",
"2020-03-01",
"2020-03-02",
"2020-03-03",
"2020-03-04",
"2020-03-05",
"2020-03-07",
"2020-03-08",
"2020-03-09",
"2020-03-10","2020-02-10",
"2020-02-13",
"2020-02-17",
"2020-02-18",
"2020-02-19",
"2020-02-20",
"2020-02-21",
"2020-02-22",
"2020-02-23",
"2020-02-24",
"2020-02-25",
"2020-02-26",
"2020-02-27",
"2020-02-28",
"2020-02-29",
"2020-03-01",
"2020-03-02",
"2020-03-03",
"2020-03-04",
"2020-03-05",
"2020-03-07",
"2020-03-08",
"2020-03-09",
"2020-03-10"]
var _chartDataWithOptions =[];
_chartDataWithOptions.push({
label:"dataseries1",
data:[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24],
backgroundColor:"blue"
})
_chartDataWithOptions.push({
label:"dataseries2",
data:[2,3,4,5,6,7,8,9,10,12,13,11,10,19,14,12,11,18,26,23,21,28,24,2,3,4,6,9,1,2,1,11,12,13,14,15,16,17,18,19,20,21,22,23,11,22,4,6,3,6],
backgroundColor:"red"
})
var config = {
type: 'bar',
data: {
labels: _datesForLabel,
datasets: _chartDataWithOptions,
borderSkipped: 'top'
},
options: {
// responsive: true,
tooltips: {
// mode: ''
},
plugins: {
colorschemes: {
scheme: 'office.Waveform6'
}
},
scales: {
yAxes: [{
ticks: {
min: 0,
}
}],
xAxes: [{
// barThickness: 40, // number (pixels) or 'flex'
maxBarThickness: 40,
barPercentage: 1,/* change this */
categoryPercentage: 0.5,/* change this */
ticks: {
min: 0,
},
}]
}
}
};
myBarChart = new Chart(ctx, config);
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.9.3/Chart.min.js" ></script>
<div style="height: 500px; width: 100%;">
<canvas id="myChart" ></canvas>
</div>
About "set labels without rotation" - again "no room" - by maxRotation: 0, - full answer + example her: Chart Js Change Label orientation on x-Axis for Line Charts
"To much points/data" issue:
For now "no way" to auto group data - one idea is to use
stacked: true ("save room") - or manually filter your data (Show fewer points - related StackOverflow Q: Chartjs 2 scaling lots of data points).
Related Github feature request: https://github.com/chartjs/Chart.js/issues/4053
I need to add a simple icon image (warning) to the center of a particular donut chart slice with chart.js... unfortunately I don't find any configuration option, in the official docs, for this purpose.
You can see an example of the result I need via the following link.
Is there any good Samaritan who can help me?
Example image
This can be done with chartjs-plugin-labels as follows:
var myChart = new Chart(document.getElementById('myChart'), {
type: 'doughnut',
data: {
labels: ['A', 'B', 'C'],
datasets: [{
data: [11, 39, 20],
backgroundColor: ['#ffb74d', '#4db6ac', '#bf360c']
}]
},
options: {
responsive: true,
plugins: {
labels: {
render: 'image',
images: [
null,
null,
{
src: 'https://i.stack.imgur.com/9EMtU.png',
width: 20,
height: 20
}
]
}
}
}
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.9.3/Chart.min.js"></script>
<script src="https://cdn.jsdelivr.net/gh/emn178/chartjs-plugin-labels/src/chartjs-plugin-labels.js"></script>
<canvas id="myChart" height="100"></canvas>
Is it possible to define a bar chart with a multi level/category axis?
For instance I'd like to display the Region/Province categories like in this Excel chart:
I found this example using multiple xAxes.
xAxes:[
{
id:'xAxis1',
type:"category",
ticks:{
callback:function(label){
var month = label.split(";")[0];
var year = label.split(";")[1];
return month;
}
}
},
{
id:'xAxis2',
type:"category",
gridLines: {
drawOnChartArea: false, // only want the grid lines for one axis to show up
},
ticks:{
callback:function(label){
var month = label.split(";")[0];
var year = label.split(";")[1];
if(month === "February"){
return year;
}else{
return "";
}
}
}
}
]
The problem is it seems that the two axes are not really linked and the alignment of second axis is based on values instead of aligning in middle of lower level category. this case cause issues
Is there a clean way to achieve this in chart.js?
Update:
I ended up creating a feature request on chartjs.
you can provide value separately for different axis via datesets and provide an object with different configuration option (borderColor, pointBackgroundColor, pointBorderColor) etc, i hope It'll help.
here is the link for the with an update (fiddle you shared) Updated Fiddle
data: {
labels: ["January;2015", "February;2015", "March;2015", "January;2016", "February;2016", "March;2016"],
datasets: [{
label: '# of Votes',
xAxisID:'xAxis1',
data: [12, 19, 3, 5, 2, 3]
},
// here i added another data sets for xAxisID 2 and it works just fine
{
label: '# of Potatoes',
xAxisID:'xAxis2',
data: [9, 17, 28, 26, 29, 9]
}]
}
I hope that solves your problem :)
Hope this helps,
I did a bit of research and couldn't find methods to implement your solution in chartjs. Chartjs has grouped bar charts but not subgrouped bar charts like in your case.
Example: http://jsfiddle.net/harshakj89/ax3zxtzw/
Here are some alternatives,
D3js (https://d3js.org/) can be used to create sub grouped bar charts.Data can be loaded from csv or json. D3 is highly configurable, but you may have to put some effort than chartsjs.
https://plnkr.co/edit/qGZ1YuyFZnVtp04bqZki?p=preview
https://stackoverflow.com/questions/37690018/d3-nested-grouped-bar-chart
https://stackoverflow.com/questions/15764698/loading-d3-js-data-from-a-simple-json-string
ZingChart is a commercial tool and can be used to implement bar charts with sub groupes.
https://www.zingchart.com/docs/chart-types/bar-charts/
But I prefer D3 over this library. because D3 comes under BSD License.
This should work as per your requirement http://tobiasahlin.com/blog/chartjs-charts-to-get-you-started/#8-grouped-bar-chart
The best library I could found to have exactly this feature is Highcharts, this is my implementation:
and here http://jsfiddle.net/fieldsure/Lr5sjh5x/2/ you can find out how to implement it.
$(function () {
var chart = new Highcharts.Chart({
chart: {
renderTo: "container",
type: "column",
borderWidth: 5,
borderColor: '#e8eaeb',
borderRadius: 0,
backgroundColor: '#f7f7f7'
},
title: {
style: {
'fontSize': '1em'
},
useHTML: true,
x: -27,
y: 8,
text: '<span class="chart-title"> Grouped Categories with 2 Series<span class="chart-href"> Black Label </span> <span class="chart-subtitle">plugin by </span></span>'
},
yAxis: [{ // Primary yAxis
labels: {
format: '${value}',
style: {
color: Highcharts.getOptions().colors[0]
}
},
title: {
text: 'Daily Tickets',
style: {
color: Highcharts.getOptions().colors[0]
}
}
}, { // Secondary yAxis
title: {
text: 'Invoices',
style: {
color: Highcharts.getOptions().colors[0]
}
},
labels: {
format: '${value}',
style: {
color: Highcharts.getOptions().colors[0]
}
},
opposite: true
}]
,
series: [{
name: 'Daily',
type: 'column',
yAxis: 1,
data: [4, 14, 18, 5, 6, 5, 14, 15, 18],
tooltip: {
valueSuffix: ' mm'
}
}, {
name: 'Invoices',
type: 'column',
data: [4, 17, 18, 8, 9, 5, 13, 15, 18],
tooltip: {
valueSuffix: ' °C'
}
}],
xAxis: {
categories: [{
name: "1/1/2014",
categories: ["Vendor 1", "Vendor 2", "Vendor 3"]
}, {
name: "1/2/2014",
categories: ["Vendor 1", "Vendor 2", "Vendor 3"]
}, {
name: "1/3/2014",
categories: ["Vendor 1", "Vendor 2", "Vendor 3"]
}]
}
});
});
body {
padding: 0px !important;
margin: 8px;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="http://code.highcharts.com/highcharts.js"></script>
<script src="http://blacklabel.github.io/grouped_categories/grouped-categories.js"></script>
<div id="container" class="chart-container"></div>
But the problem is the library is not free for commercial purposes, and this is the Chartjs implementation, in my case it is look like this:
const data ={"labels":[{"label":"Exams","children":["Wellness Examination"]},{"label":"Surgery","children":["Neuter Surgery"]},{"label":"Vaccines","children":["Bordetella"]},{"label":"Dentistry","children":["Dental Cleaning"]},{"label":"Diagnostics","children":["Other","Pre-Anesthetic","Adult Diagnostics","Pre-Anesthetic Diagnostics","Heartworm & Tick Borne Disease Test"]},{"label":"Treatments/Other","children":["Other","Microchip"]}],"datasets":[{"label":"Consumed","backgroundColor":"red","tree":[{"value":0,"children":["0"]},{"value":0,"children":["0"]},{"value":1,"children":["1"]},{"value":0,"children":["0"]},{"value":15,"children":["0","1","3","11","0"]},{"value":15,"children":["2","13"]}]},{"label":"Purchased","backgroundColor":"blue","tree":[{"value":28,"children":["28"]},{"value":1,"children":["1"]},{"value":24,"children":["24"]},{"value":10,"children":["10"]},{"value":103,"children":["2","16","34","49","2"]},{"value":165,"children":["75","90"]}]}]};
window.onload = () => {
const ctx = document.getElementById("canvas").getContext("2d");
window.myBar = new Chart(ctx, {
type: 'bar',
data: data,
options: {
responsive: true,
title: {
display: true,
text: 'Chart.js Hierarchical Bar Chart'
},
layout: {
padding: {
// add more space at the bottom for the hierarchy
bottom: 45
}
},
scales: {
xAxes: [{
type: 'hierarchical',
stacked: false,
// offset settings, for centering the categorical
//axis in the bar chart case
offset: true,
// grid line settings
gridLines: {
offsetGridLines: true
}
}],
yAxes: [{
stacked: false,
ticks: {
beginAtZero: true
}
}]
}
}
});
};
canvas {
-moz-user-select: none;
-webkit-user-select: none;
-ms-user-select: none;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://unpkg.com/chart.js/dist/Chart.bundle.js"></script>
<script src="https://unpkg.com/chartjs-scale-hierarchical"></script>
<div id="container" style="width: 75%;">
<canvas id="canvas"></canvas>
</div>
for each more column just add another dataset.
Using Chart.js, I'm trying to get the x-axis (and toolips) to show a DATE, but all I can get are large integers appearing as the x-axis label. I've compared what the example in the documentation does and I don't see what it's doing that i'm not. Can anyone please help?
Here's the tiny example that I created showing it not working.
(btw - as a side issue, notice that if the color of the RED line is spelled Red rather than red, the line looks normal, but tooltips no longer work on that line)
https://plnkr.co/edit/CKUf4zFC1vhe3VNUF5Lf?p=preview
javascript for the above plunker example is below
----------------------------------------------------
<!DOCTYPE html>
<html>
<head>
</head>
<body>
<div>
<canvas id="canvas"></canvas>
<script>
var chartData = {
datasets: [{
borderColor: 'Red',
label: 'Capital R in borderColor, tooltips dont work',
data: [{
x: new Date('2011-04-11T11:45:00'),
y: 25
}, {
x: new Date('2011-04-11T12:51:00'),
y: 28
}, {
x: new Date('2011-04-11T14:10:00'),
y: 22
}, {
x: new Date('2011-04-11T15:15:00'),
y: 18
}]
}, {
borderColor: 'green',
label: 'borderColor all lower case, tooltips now work',
data: [{
x: new Date('2011-04-11T11:45:00'),
y: 15
}, {
x: new Date('2011-04-11T12:51:00'),
y: 18
}, {
x: new Date('2011-04-11T14:10:00'),
y: 12
}, {
x: new Date('2011-04-11T15:15:00'),
y: 8
}]
}, ]
};
window.onload = function() {
var ctx = document.getElementById("canvas").getContext("2d");
window.myScatterxx = Chart.Scatter(ctx, {
data: chartData,
scaleType: 'date',
options: { title: { display: true, text: "scaleType='date' isn't working", fontSize:36} },
});
};
</script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.2.1/Chart.min.js">
</script>
</body>
</html>
First of all, since the documentation is messy, I'm not surprised you didn't get how to create a time-scale chart. The actual call is the following :
window.myScatterxx = Chart.Scatter(ctx, {
data: chartData,
options: {
title: {
display: true,
text: "it is now working",
fontSize: 36
},
scales: {
xAxes: [{
// This is the important part
type: "time",
}]
}
},
});
Now you have the correct syntax, you'd need to import the correct library as well. As I can see in the piece of code you gave, you imported Chart.min.js, but you need more since you know work with the time element.
You can either :
Import Moment.js (CDN link) and then Chart.min.js.
Import Chart.bundle.min.js, that contains both Moment and Chart libraries.
Finally, I also noticed in your code you had a problem displaying tooltips for the red dataset. It is because you defined its color as Red. Change it to red and tooltips will work again :
datasets: [{
borderColor: 'red',
label: 'Capital R in borderColor, tooltips now work',
data: [
// ...
]
}]
You can see all these fixes live in this jsFiddle, and here is the final result :