I am using Chart.js to create a horizontal bar chart as shown below. The y axis has three labels: A, B, C. How do I style those vertical labels individually? For example, I may want to have one or two of those labels bolded and/or red.
I looked at this answer: https://stackoverflow.com/a/65463614/3851085. However, that is a solution for the x-axis. For the y-axis, there needs to be a different solution to compute the x pixel of each label.
The code snippet is with an older version of Chart.js, but I am actually using the latest version.
<html>
<head>
<title>Horizontal Bars</title>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.9.3/Chart.min.js"></script>
</head>
<body>
<div>
<canvas id="canvas" height="100"></canvas>
</div>
<script>
window.onload = function() {
var ctx = document.getElementById('canvas').getContext('2d');
window.myBar = new Chart(ctx, {
type: 'horizontalBar',
data: {
labels: ['A', 'B', 'C'],
datasets: [{
data: [[1, 3], [4, 5], [2, 6]],
backgroundColor: 'lightblue'
}]
},
options: {
responsive: true,
legend: {
display: false,
}
}
});
};
</script>
</body>
</html>
The documentation is unclear about that, but you can use arrays in options to configure labels.
Here is your code, refactored to be compatible with Chart.js 4.2.0:
window.onload = function() {
var ctx = document.getElementById('myChart').getContext('2d');
window.myBar = new Chart(ctx, {
type: 'bar',
data: {
labels: ['A', 'B', 'C'],
datasets: [{
data: [[1, 3], [4, 5], [2, 6]],
backgroundColor: 'lightblue'
}]
},
options: {
responsive: true,
indexAxis: 'y',
scales: {
y: {
ticks: {
color: ['#ff0000', '#000000', '#000000'],
font: {
weight: ['bold', 'bold', 'normal']
}
}
}
},
plugins: {
legend: {
display: false
}
}
}
});
};
.chart-container {
position: relative;
height: 90vh;
}
<script src="https://cdn.jsdelivr.net/npm/chart.js#4.2.0"></script>
<div class="chart-container">
<canvas id="myChart"></canvas>
</div>
Related
Now i have this chart:
https://codepen.io/UnluckySerivelha/pen/BawpPYv
const ctx = document.getElementById('graph').getContext('2d');
var bar_ctx = document.getElementById('graph').getContext('2d');
x=["14 Dec","15 Dec"];
y1={"14 Dec":0,"15 Dec":0,};
y2={"14 Dec":0,"15 Dec":0,};
const myChart = new Chart(ctx, {
type: 'bar',
data: {
labels: x,
datasets: [
{
label: 'Всего за день',
data: y1
},
{
label: 'Будет начислено по вкладам',
data: y2,
},
]
},
options: {
scales: {
y: {
beginAtZero: true,
ticks: {
callback: function(value, index, values) {
return '$ ' + value;
}
}
}
},
responsive: true,
maintainAspectRatio: false
},
});
I want to add background image for chart area, but not for labels. I know how to add background image, but don't know how to get size of chart area without labels for assignment size and position of image. Is it possible?
You can check the chartArea property that is available in the chart context. This property has the width and height of the area where the chart itself is being drawn.
const options = {
type: 'line',
data: {
labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
datasets: [{
label: '# of Votes',
data: [12, 19, 3, 5, 2, 3],
borderWidth: 1
},
{
label: '# of Points',
data: [7, 11, 5, 8, 3, 7],
borderWidth: 1
}
]
},
options: {}
}
const ctx = document.getElementById('chartJSContainer').getContext('2d');
const chart = new Chart(ctx, options);
console.log('height: ', chart.chartArea.height);
console.log('width: ', chart.chartArea.width)
<body>
<canvas id="chartJSContainer" width="600" height="400"></canvas>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/3.6.2/chart.js"></script>
</body>
Your own code with the background colored pink: https://codepen.io/leelenaleee/pen/OJxWoPe
Official example on using an image as background: https://www.chartjs.org/docs/master/configuration/canvas-background.html#image
Hello i am rendering these charts using chart js but i am unable to align these charts in the same order my config file and options file is given below
can anyone please help me with this. i tried with below options and data
const options = {
indexAxis: "y",
maintainAspectRatio: false,
aspectRatio: 0.8,
barThickness: 20,
responsive: true,
layout: {
padding: {
left: 1
}
},
plugins: {
legend: {
display: false
}
},
scales: {
x: {
ticks: {
color: "#495057"
},
grid: {
color: "#ebedef"
}
},
y: {
ticks: {
color: "#495057",
crossAlign: "near"
},
grid: {
color: "#ebedef"
},
gridLines: {
offsetGridLines: true,
display: true
}
}
}
};
const data = {
labels: ["red"],
datasets: [{
backgroundColor: "#42A5F5",
data: [65],
borderWidth: 2,
borderRadius: 75,
borderSkipped: false
},
{
backgroundColor: "#FFA726",
data: [28],
borderWidth: 2,
borderRadius: 50,
borderSkipped: false
}
]
};
how to align one below the other labels
As far as I know chart.js does not provide an option to set a minimum distance for the labels, a workaround to achieve this is to add spaces the the labels of the charts where the labels are shorter as the longest one so you will get something like this:
var options = {
type: 'bar',
data: {
labels: [" Red"],
datasets: [{
label: '# of Votes',
data: [12],
backgroundColor: 'pink'
}]
},
options: {
indexAxis: 'y'
}
}
var ctx = document.getElementById('chartJSContainer').getContext('2d');
new Chart(ctx, options);
<body>
<canvas id="chartJSContainer" width="600" height="400"></canvas>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/3.5.0/chart.js"></script>
</body>
var options = {
type: 'bar',
data: {
labels: [" Red"],
datasets: [{
label: '# of Votes',
data: [12],
backgroundColor: 'pink'
}]
},
options: {
indexAxis: 'y'
}
}
var options2 = {
type: 'bar',
data: {
labels: [" Yellowwwww"],
datasets: [{
label: '# of Votes',
data: [12],
backgroundColor: 'pink'
}]
},
options: {
indexAxis: 'y'
}
}
var ctx = document.getElementById('chartJSContainer').getContext('2d');
var ctx2 = document.getElementById('chartJSContainer2').getContext('2d');
new Chart(ctx2, options2);
new Chart(ctx, options);
<body>
<canvas id="chartJSContainer" width="600" height="400"></canvas>
<canvas id="chartJSContainer2" width="600" height="400"></canvas>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/3.5.0/chart.js"></script>
</body>
I've assigned three different colours to the labels, but the colour dots always show up as Blue, Green and Yellow. I'm pretty sure I've done something wrong.
The code I've written is:
var pieSimpleChart = {
chart: {
height: 350,
type: 'pie',
},
legend: {
position: 'bottom'
},
labels: ["IT", "Product Development", "Sales"],
series: [2, 2, 6],
fill: {
colors: ["#447b40", "#cc7870", "#e74ce4"]
}
}
var chart = new ApexCharts(document.querySelector("#task-pie-chart"), pieSimpleChart);
chart.render();
How can I match the labels to my selected colours?
I fixed it by removing "fill" option.
Now code looks like:
var pieSimpleChart =
{
chart:
{
height: 350,
type: 'pie',
},
legend:
{
position: 'bottom'
},
labels: ["IT", "Product Development", "Sales"],
series: [2, 2, 6],
colors: ["#447b40", "#cc7870", "#e74ce4"]
}
Use backgroundColor instead off fill: colors.
Also, you should use the dataset object for passing the values:
var ctx = document.getElementById("myChart").getContext('2d');
var myChart = new Chart(ctx, {
type: 'pie',
data: {
labels: ["IT", "Product Development", "Sales"],
datasets: [{
backgroundColor: [
"#ff0000",
"#00ff00",
"#0000ff"
],
data: [2, 2, 6]
}]
},
options: {
legend: {
position: 'bottom'
}
}
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.8.0/Chart.js"></script>
<div class="container">
<div>
<canvas id="myChart"></canvas>
</div>
</div>
Is there a way in chartjs to have a bar span across the zero line? As an example,
lets say I have a bar with
data:[x:1, y:100]
How do I tell it to span the y-axis from -100 to 100 (instead of from 0 to 100)?
I have sort of a playground here where I can do either negative or positive per bar, but not both for one bar.
https://jsbin.com/dufonoceja/1/edit?js,output
This can be done since Chart.js v2.9.0, which now supports floating bars. Individual bars can now be specified with the syntax [min, max].
<html>
<head>
<title>Floating Bars</title>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.9.3/Chart.min.js"></script>
<style>
canvas {
-moz-user-select: none;
-webkit-user-select: none;
-ms-user-select: none;
}
</style>
</head>
<body>
<div>
<canvas id="canvas" height="120"></canvas>
</div>
<script>
var chartData = {
labels: [1,2,3,4,5,6],
datasets: [{
type: 'bar',
label: 'Red Bar',
borderColor: 'black',
borderWidth: 1,
backgroundColor: 'rgba(128,0,0,0.2)',
data: [[0, 100], [-100, 100], [-30, 40], 0, 0, 0],
}, {
type: 'bar',
label: 'Green Bar',
backgroundColor: 'rgba(0,128,0,0.2)',
borderColor: 'black',
borderWidth: 1,
data: [0, 0, 0, 0, [-50, 70], 100],
}
]
};
window.onload = function() {
var ctx = document.getElementById('canvas').getContext('2d');
window.myBar = new Chart(ctx, {
type: 'bar',
data: chartData,
options: {
scaleBeginAtZero: false,
responsive: true,
spanGaps: true,
tooltips: {
mode: 'index',
intersect: true
},
scales: {
xAxes: [{
gridLines: {
display: false
},
}],
yAxes: [{
type: 'linear',
ticks: {
beginAtZero: false,
min:-100,
max:100,
stepSize:30
}
}],
}
}
});
};
</script>
</body>
</html>
A simple stacked bar graph
<head>
<title>Stacked Bar Chart</title>
<script src="Chart.bundle.js"></script>
<script src="utils.js"></script>
<style>
canvas {
-moz-user-select: none;
-webkit-user-select: none;
-ms-user-select: none;
}
</style>
</head>
<body>
<div style="width: 75%">
<canvas id="canvas"></canvas>
</div>
<button id="randomizeData">Randomize Data</button>
<script>
chartColors = {
redborder: 'rgba(206, 0, 23, 1)',
darkredborder: 'rgba(206, 0, 23, 0.75)',
lightredborder: 'rgba(206, 0, 23, 0.5)',
};
var barChartData = {
labels: [1<img src='images/badges/Manchester United.png' alt='Manchester United.png' height='30' width='30'>,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32],
datasets: [{
label: 'Goals',
backgroundColor: window.chartColors.redborder,
data: [0,1,3,0,2,0,0,2,0,1,0,1,1,0,0,1,0,0,2,1,0,1,2,1,1,0,0,0,2,2,0,3]
}, {
label: 'Assists',
backgroundColor: window.chartColors.darkredborder,
data: [0,0,1,1,0,0,0,0,1,0,0,0,0,0,0,0,1,0,1,0,0,0,0,0,0,0,0,0,1,0,0,1]
}, {
label: 'Indirect',
backgroundColor: window.chartColors.lightredborder,
data: [0,0,1,0,0,0,0,0,1,1,0,1,0,0,1,0,0,0,1,1,0,1,2,0,0,0,1,0,0,0,0,1]
}]
};
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
}]
}
}
});
};
document.getElementById('randomizeData').addEventListener('click', function() {
barChartData.datasets.forEach(function(dataset) {
dataset.data = dataset.data.map(function() {
return randomScalingFactor();
});
});
window.myBar.update();
});
</script>
</body>
</html>
in the x-axis labels, I am trying to get a small icon (image) to be displayed instead of a number. I have tried to put just the image tag in all possible combinations of " and ' as well as with the number. But to no avail. The chart does not render. It seems that the label needs to recognized as a value to render and the html tag knocks this out of place. I don't see why an image tag cannot be put in there, is there a way to do this?