I'm using ChartJS for a project at work, where I try to generate a chart from one or more series of data and some option (chart type, title, type of values of x and y, and so on). Everything is going smooth except of a scatter type when I have multiple dataset on data.
var ctx = $('#myChart');
var chart = new Chart (ctx,{
type: "scatter",
data: {
"datasets":[
{
label:"Series #1",
fill:false,
borderColor:"rgba(0,137,176,0.4)",
backgroundColor:"rgba(0,137,176,0.1)",
pointBorderColor:"rgba(0,137,176,0.7)",
pointBackgroundColor:"rgba(0,137,176,0.5)",
data:[
{"x":"alpha","y":36.2},
{"x":"beta","y":36.9},
{"x":"gamma","y":37},
{"x":"delta","y":38.3},
{"x":"epsilon","y":37.9},
{"x":"zeta","y":37.2}
]
}, {
label:"Series #2",
fill:false,
borderColor:"rgba(19,237,150,0.4)",
backgroundColor:"rgba(19,237,150,0.1)",
pointBorderColor:"rgba(19,237,150,0.7)",
pointBackgroundColor:"rgba(19,237,150,0.5)",
data:[
{"x":"alpha","y":37.4},
{"x":"beta","y":37.1},
{"x":"gamma","y":36.5},
{"x":"delta","y":36.4},
{"x":"epsilon","y":36.4},
{"x":"zeta","y":36.5}
]
}, {
label:"Series #3",
fill:false,
borderColor:"rgba(248,231,28,0.4)",
backgroundColor:"rgba(248,231,28,0.1)",
pointBorderColor:"rgba(248,231,28,0.7)",
pointBackgroundColor:"rgba(248,231,28,0.5)",
data:[
{"x":"alpha","y":38.1},
{"x":"beta","y":38.4},
{"x":"gamma","y":39},
{"x":"delta","y":39.2},
{"x":"epsilon","y":38.1},
{"x":"zeta","y":37.4}
]
}],
"labels":["alpha","beta","gamma","delta","epsilon","zeta"]},
options: {
elements: { line: { tension: 0 } },
scales: {
xAxes: [
{
scaleLabel:{
display:true,
labelString:"Date"
},
bounds:"data",
type:"category"
},{
display:false
},{
display:false
}
],
yAxes:[
{
scaleLabel: {
display:true,
labelString:"Temperature (°C)"
},
bounds:"data",
ticks:{
min:35.9,
max:39.5,
autoSkip:false,
stepSize:0.6
}
}, {
display:false
}, {
display:false
}
]
},
},
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.7.2/Chart.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<html>
<head>
</head>
<body>
<canvas id="myChart"></canvas>
</body>
</html>
As you can easily notice, in my graph there's no grid, no xAxes definition, no yAxes definition. And I don't know why.
So, this is my question: why my scatter chart do not show grid and axes?
I give two more hints:
1 - if you play with the snippet changing the chart type from scatter to line, everything works fine.
2 - The weird xAxes structure is automatically generated since the three passed datasets uses all the same categories. My code create the first xAxes from the first dataset, and create a simple object { display: false } for the other datasets (chart.options.scales.xAxes requires to be an Array of the same size of the Dataset).
I always consider myself a newbie so any suggestion (about this problem, but also about my approach to it) is more than welcome.
If you remove the { display: false } you can see the gridlines. Not sure if you need this or not?
If you do really need this, then you can always check if (type === 'line') and if so you add the { display: false } to the options.
var ctx = $('#myChart');
var chart = new Chart (ctx,{
type: "scatter",
data: {
"datasets":[
{
label:"Series #1",
fill:false,
borderColor:"rgba(0,137,176,0.4)",
backgroundColor:"rgba(0,137,176,0.1)",
pointBorderColor:"rgba(0,137,176,0.7)",
pointBackgroundColor:"rgba(0,137,176,0.5)",
data:[
{"x":"alpha","y":36.2},
{"x":"beta","y":36.9},
{"x":"gamma","y":37},
{"x":"delta","y":38.3},
{"x":"epsilon","y":37.9},
{"x":"zeta","y":37.2}
]
}, {
label:"Series #2",
fill:false,
borderColor:"rgba(19,237,150,0.4)",
backgroundColor:"rgba(19,237,150,0.1)",
pointBorderColor:"rgba(19,237,150,0.7)",
pointBackgroundColor:"rgba(19,237,150,0.5)",
data:[
{"x":"alpha","y":37.4},
{"x":"beta","y":37.1},
{"x":"gamma","y":36.5},
{"x":"delta","y":36.4},
{"x":"epsilon","y":36.4},
{"x":"zeta","y":36.5}
]
}, {
label:"Series #3",
fill:false,
borderColor:"rgba(248,231,28,0.4)",
backgroundColor:"rgba(248,231,28,0.1)",
pointBorderColor:"rgba(248,231,28,0.7)",
pointBackgroundColor:"rgba(248,231,28,0.5)",
data:[
{"x":"alpha","y":38.1},
{"x":"beta","y":38.4},
{"x":"gamma","y":39},
{"x":"delta","y":39.2},
{"x":"epsilon","y":38.1},
{"x":"zeta","y":37.4}
]
}],
"labels":["alpha","beta","gamma","delta","epsilon","zeta"]},
options: {
elements: { line: { tension: 0 } },
scales: {
xAxes: [
{
scaleLabel:{
display:true,
labelString:"Date"
},
bounds:"data",
type:"category",
}
],
yAxes:[
{
scaleLabel: {
display:true,
labelString:"Temperature (°C)"
},
bounds:"data",
ticks:{
min:35.9,
max:39.5,
autoSkip:false,
stepSize:0.6
}
}
]
},
},
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.7.2/Chart.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<html>
<head>
</head>
<body>
<canvas id="myChart"></canvas>
</body>
</html>
Related
I would like to make a chart with labels on xAxes and the same labels in the legend. I was trying different solutions, but the best I got is the snippet below. I don't understand, why all bars are connected with my first label. Could you please help me to fix it?
I found a solution with would be almost perfect here, but unfortunately, it doesn't work as expected: after clicking on the label in legend all charts are hiding, not only one corresponding to the label I clicked.
var canvas2 = document.getElementById("wykres_kategorie");
var ctxD2 = canvas2.getContext('2d');
var myLineChart = new Chart(ctxD2, {
type: 'bar',
data: {
labels: [
'a','b','c'
],
datasets: [
{
label: 'a',
data: [ 60 ],
backgroundColor: [ 'red' ],
},
{
label: 'b',
data: [ 80 ],
backgroundColor: [ 'blue' ],
},
{
label: 'c',
data: [ 50 ],
backgroundColor: [ 'yellow' ],
},
]
},
options: {
legend: {
position: 'bottom'
},
responsive: true,
scales: { xAxes: [{
ticks: {
autoSkip: false
} }],
yAxes:[{ ticks: {beginAtZero: true}}]}
}
});
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/js/bootstrap.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/mdbootstrap/4.20.0/js/mdb.min.js"></script>
<canvas class='col-12 mx-auto' id="wykres_kategorie"></canvas>
The data.labels defines the ticks for a category axis. Following your configuration, the chart is expecting to have 3 data items for dataset, (first at tick 'a', second at tick 'b', third at tick 'c').
Instead, the dataset.label are used in the legend.
In your config, all datasets have got only 1 value and all values are related to the first data.labels, 'a'.
In my code below, I am able to draw a Treemap and also display the tag in each tree cell. But I want to add some custom text next to my tag,
Like say I want the word 'Language' to appear in each tree map cell. I tried the formatter options, But its not working for the version of chart.js I am using. Kindly provide me a solution for the specific version I am using. Since I have multiple other charts defined and changing the version would cause issues.
var topTags = [
{tag:'android',num:42657},{tag:'reactjs',num:38844},{tag:'php',num:34381},{tag:'sql',num:29996},
];
var canvas = document.getElementById("treemap");
var ctx = canvas.getContext("2d");
var chart = window.chart = new Chart(ctx, {
type: "treemap",
data: {
datasets: [{
tree: topTags,
key: "num",
groups: ['tag'],
spacing: 0.5,
borderWidth: 1.5,
fontColor: "black",
borderColor: "grey"
}]
},
options: {
maintainAspectRatio: false,
legend: { display: false },
tooltips: { enabled: false }
}
});
CHART.JS AND TREEMAP VERSION :
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.9.4/Chart.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/chartjs-chart-treemap#0.2.3"></script>
The formatter option only got added in version 2 of the treemap chart type, the scriptable option is only available in version 1 so the best way for you to get the extra text is by editing your original data array first and adding the text to it that way like so:
let topTags = [{
tag: 'android',
num: 42657
}, {
tag: 'reactjs',
num: 38844
}, {
tag: 'php',
num: 34381
}, {
tag: 'sql',
num: 29996
}, ];
topTags = topTags.map(e => ({
num: e.num,
tag: `Lang: ${e.tag}`
}))
const canvas = document.getElementById("chart");
const ctx = canvas.getContext("2d");
const chart = window.chart = new Chart(ctx, {
type: "treemap",
data: {
datasets: [{
tree: topTags,
key: "num",
groups: ['tag'],
spacing: 0.5,
borderWidth: 1.5,
fontColor: "black",
borderColor: "grey",
}]
},
options: {
maintainAspectRatio: false,
legend: {
display: false
},
tooltips: {
enabled: false
}
}
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.9.4/Chart.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/chartjs-chart-treemap#0.2.3"></script>
<canvas id="chart"></canvas>
How can I add these styles to my graph? I'm having trouble finding it in the documentation for it, and the other forums aren't very helpful. I am using Flask for the backend, so that's why the data values look like that.
Labels on top of bars
Change font size on both axis
Set y scale as a fixed value (0,8)
<script>
var ctx = document.getElementById('myChart').getContext('2d');
var options = {
scales: {
yAxes: [{
ticks: {
fontSize: 40
}
}]
}
}
var myChart = new Chart(ctx, {
type: 'bar',
data: {
labels: ['Lithium Battery', 'Other Mfg', 'Delivery', 'Tailpipe', 'Fuel Cycle', 'Disposal', 'Total'],
datasets: [{
label: 'ICEV CAR (MTCO2e/Year)',
labels: [
"{{data['battery_icev_car']}}",
"{{data['other_mfg_icev_car']}}",
"{{data['delivery_icev_car']}}",
"{{data['tailpipe_icev_car']}}",
"{{data['fuel_cycle_icev_car']}}",
"{{data['disposal_icev_car']}}",
"{{data['total_icev_car']}}"
],
data: [ /* errors are normal, fixes when server ru
[0, {{data['y1_icev']}}],
[{{data['y1_icev']}}, {{data['y2_icev']}}],
[{{data['y2_icev']}}, {{data['y3_icev']}}],
[{{data['y3_icev']}}, {{data['y4_icev']}}],
[{{data['y4_icev']}}, {{data['y5_icev']}}],
[{{data['y5_icev']}}, {{data['y6_icev']}}],
[0, {{data['y6_icev']}}]
],
backgroundColor: [
'rgba(0,0,0,0.9)'
],
borderColor: [
'rgba(0,0,0,1)'
],
borderWidth: 1,
borderSkipped: false
}]
},
options: {
responsive: true,
plugins: {
legend: {
labels: {
// This doesn't work on axis
font: {
size: 20
}
}
}
},
y: {
beginAtZero: true
}
}
});
</script> </script>
Since your config is not working I assume you are using V3, in which case the solution is as followed:
For point one you need to use an external plugin, you can write your own or use the datalabels plugin
For your second problem you need to style it as a font object as told in the documentation like so:
options: {
scales: {
y:{
ticks:{
font:{
size: 50
}
}
}
}
}
For your last part you can set the stepSize to 0.8
I use chart js to display my graph, but it wont displaying it...
I try to check it in jsfiddle and it works there, but on my website it actually wont work.
The source from chart.js is correctly embedded, so i don't know what the error could be
jsfiddle Link
My code:
var diemeltalsperrectx = document.getElementById('diemeltalsperre').getContext('2d');
var diemeltalsperre = new Chart(diemeltalsperrectx, {
type: 'line',
data: {
labels: [
'08.05.2020 - 18:15:00',
'09.05.2020 - 01:00:00',
'09.05.2020 - 06:15:00',
'09.05.2020 - 18:15:00',
'10.05.2020 - 01:00:00',
'10.05.2020 - 06:15:00',
],
datasets: [{
fill: true,
label: 'Pegelstand (cm)',
data: [
374.91,
374.9,
374.9,
374.87,
374.87,
374.84,
],
backgroundColor: [
'rgba(0,0,128, 1)'
],
borderColor: [
'rgba(0,0,128, 1)'
],
borderWidth: 3
}]
},
options: {
scales: {
yAxes: [{
ticks: {
beginAtZero: true
}
}]
}
}
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.3.0/Chart.js"></script>
<canvas id='diemeltalsperre' width='800' height='400'></canvas>
The values are very close to each other, try with:
beginAtZero:false
How can I create a stacked column chart with dynamic data?
For example, I have an external JSON object like:
[
{
id : ‘ID123’,
occurrences: [5,6,8],
description: ["Hours spent working", "Hours spent skiing", "Hours spent studying"]
},
{
id : ‘ID456’,
occurrences: [7,2,12],
description: ["Hours spent working", "Hours spent skiing", "Hours spent studying"]
}
]
How do I make it so there would be two stacked columns using the id as the label and the array of occurrences is used to build the stacked column on top of each label?
Edit:
Added representation of how graph should look
I would suggest using chart.js for this as it will be much easier than building it out yourself. Here is a example using the data you provided.
var barChartData = {
labels: ['ID123', 'ID456'],
datasets: [{
label: 'Hours spent working',
backgroundColor: '#FF0000',
data: [
5,
7
]
}, {
label: 'Hours spent skiing',
backgroundColor: '#00FF00',
data: [
6,
2
]
}, {
label: 'Hours spent studying',
backgroundColor: '#0000FF',
data: [
8,
12,
]
}]
};
window.onload = function() {
var ctx = document.getElementById('canvas').getContext('2d');
window.myBar = new Chart(ctx, {
type: 'bar',
data: barChartData,
options: {
title: {
display: true,
text: 'Chart.js Bar Chart - Stacked'
},
tooltips: {
mode: 'index',
intersect: false
},
responsive: true,
scales: {
xAxes: [{
stacked: true,
}],
yAxes: [{
stacked: true
}]
}
}
});
};
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.8.0/Chart.min.js"></script>
<canvas id="canvas"></canvas>