Is it possible to make a time interval using Chart.js? As far as I'm concerned, using stacked bars chart is the closest I can get but not quite what I want
What I'm trying to achieve is this time interval
Here's the code
const data = {
labels: ['Mon', 'Tue', 'Wed' ],
datasets: [{
label: 'Bars',
data: [
[14, 16],
[17, 22],
[13, 19],
],
backgroundColor: [
'rgba(255, 26, 104, 0.2)',
],
borderColor: [
'rgba(255, 26, 104, 1)',
],
borderWidth: 2,
borderSkipped: false
}]
};
const config = {
type: 'bar',
data,
options: {
indexAxis: 'y',
scales: {
x: {
min: 12,
max: 26,
ticks: {
stepSize: 1,
callback: (val, index) => {
return `${String(val % 24).padStart(2, '0')}:00`
}
},
},
y: {
beginAtZero: true
}
}
}
};
const myChart = new Chart(
document.getElementById('myChart'),
config
);
You can use horizontalBar for your bar type. Example:
{
type: 'horizontalBar',
data: {
labels: ["a","b","c","d","e","f","g"],
datasets: [{
axis: 'y',
label: 'My First Dataset',
data: [[5,65], [30,90], [20,80], [15,71], [20,56], [24,55], [15,70]],
fill: false,
backgroundColor: [
'rgba(255, 99, 132, 0.2)',
'rgba(255, 159, 64, 0.2)',
'rgba(255, 205, 86, 0.2)',
'rgba(75, 192, 192, 0.2)',
'rgba(54, 162, 235, 0.2)',
'rgba(153, 102, 255, 0.2)',
'rgba(201, 203, 207, 0.2)'
],
borderColor: [
'rgb(255, 99, 132)',
'rgb(255, 159, 64)',
'rgb(255, 205, 86)',
'rgb(75, 192, 192)',
'rgb(54, 162, 235)',
'rgb(153, 102, 255)',
'rgb(201, 203, 207)'
],
borderWidth: 1
}]
},
options: {
indexAxis: 'y',
scales: {
x: {
stacked: true
},
y: {
stacked: true
}
}
}
}
here the result
I hope can help you.
Related
const labels = ['s', 'a', 'd']
const data = {
labels: labels,
datasets: [{
label: 'Weekly Sales',
data: [
{products: { sales: [0, 5], id: 1 } },
{products: { sales: [5, 10], id: 2 } },
{products: { sales: [10, 15], id: 3 } },
],
backgroundColor: [
'rgba(255, 26, 104, 0.2)',
'rgba(54, 162, 235, 0.2)',
'rgba(255, 206, 86, 0.2)',
],
borderColor: [
'rgba(255, 26, 104, 1)',
'rgba(54, 162, 235, 1)',
'rgba(255, 206, 86, 1)',
],
borderWidth: 1
}]
};
// config
const config = {
type: 'bar',
data,
options: {
parsing: {
yAxisKey: 'products.sales',
},
indexAxis: 'y',
scales: {
y: {
beginAtZero: true
}
}
}
};
I'm trying to create a horizontal barchart using Chartjs I'm kind of in trouble putting data to the chart. enter image description here The output should be like this one in the image.
Instead of defining parsing.yAxisKey, you could map the raw data as follows:
data: rawData.map(o => o.products.sales),
Please take a look at your amended and runnable code below and see how it works.
const labels = ['s', 'a', 'd'];
const rawData = [
{products: { sales: [0, 5], id: 1 } },
{products: { sales: [5, 10], id: 2 } },
{products: { sales: [10, 15], id: 3 } },
];
const data = {
labels: labels,
datasets: [{
label: 'Weekly Sales',
data: rawData.map(o => o.products.sales),
backgroundColor: [
'rgba(255, 26, 104, 0.2)',
'rgba(54, 162, 235, 0.2)',
'rgba(255, 206, 86, 0.2)',
],
borderColor: [
'rgba(255, 26, 104, 1)',
'rgba(54, 162, 235, 1)',
'rgba(255, 206, 86, 1)',
],
borderWidth: 1
}]
};
// config
const config = {
type: 'bar',
data,
options: {
indexAxis: 'y',
scales: {
y: {
beginAtZero: true
}
}
}
};
new Chart('myChart', config);
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/3.9.1/chart.min.js"></script>
<canvas id="myChart" height="80"></canvas>
How to convert a bar chart into a triangle shaped chart using Chart JS ?
For eg: Sample Bar Chart : How to convert it into triangles instead of bars ?
var ctx = document.getElementById('myChart');
var myChart = new Chart(ctx, {
type: 'bar',
data: {
labels: ['Red', 'Blue', 'Yellow', 'Green', 'Purple', 'Orange'],
datasets: [{
label: '# of Votes',
data: [12, 19, 3, 5, 2, 3],
backgroundColor: [
'rgba(255, 99, 132, 0.2)',
'rgba(54, 162, 235, 0.2)',
'rgba(255, 206, 86, 0.2)',
'rgba(75, 192, 192, 0.2)',
'rgba(153, 102, 255, 0.2)',
'rgba(255, 159, 64, 0.2)'
],
borderColor: [
'rgba(255, 99, 132, 1)',
'rgba(54, 162, 235, 1)',
'rgba(255, 206, 86, 1)',
'rgba(75, 192, 192, 1)',
'rgba(153, 102, 255, 1)',
'rgba(255, 159, 64, 1)'
],
borderWidth: 1
}]
},
options: {
scales: {
y: {
beginAtZero: true
}
}
}
});
You can use a scatter chart and define individual datasets for each value.
Please take a look at your amended code and see how it works.
const labels = ['Red', 'Blue', 'Yellow', 'Green', 'Purple', 'Orange'];
const data = [12, 19, 3, 5, 2, 3];
const colors = ['255, 99, 132', '54, 162, 235', '255, 206, 86', '75, 192, 192', '153, 102, 255', '255, 159, 64'];
const datasets = labels.map((l, i) => ({
label: l,
data: [{ x: i + 1 - 0.45, y: 0 }, { x: i + 1, y: data[i] }, { x: i + 1 + 0.45, y: 0 }],
fill: true,
backgroundColor: 'rgba(' + colors[i] + ', 0.2)',
borderColor: 'rgb(' + colors[i] + ')',
showLine: true,
borderWidth: 1,
lineTension: 0,
pointRadius: 0,
pointHitRadius: 0
}));
new Chart('myChart', {
type: 'scatter',
data: {
datasets: datasets
},
options: {
scales: {
y: {
beginAtZero: true
},
x: {
min: 0,
max: labels.length + 1,
ticks: {
callback: (v, i) => labels[i - 1]
},
grid: {
display: false
}
}
}
}
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/3.3.2/chart.min.js"></script>
<canvas id="myChart" height="110"></canvas>
You will have to implement your own custom chart type to do this since it's not possible by default, you can read here in the documentation how to implement your own chart type: https://www.chartjs.org/docs/master/developers/charts.html
var ctx = document.getElementById('myChart').getContext('2d');
var myChart = new Chart(ctx, {
type: 'line',
data: {
labels: {{ labels}},//labels are the time values
datasets: [{
label: '# temperature',
data: {{ datas}},
backgroundColor: [
'rgba(255, 99, 132, 0.2)',
'rgba(54, 162, 235, 0.2)',
'rgba(255, 206, 86, 0.2)',
'rgba(75, 192, 192, 0.2)',
'rgba(153, 102, 255, 0.2)',
'rgba(255, 159, 64, 0.2)'
],
borderColor: [
'rgba(255, 99, 132, 1)',
'rgba(54, 162, 235, 1)',
'rgba(255, 206, 86, 1)',
'rgba(75, 192, 192, 1)',
'rgba(153, 102, 255, 1)',
'rgba(255, 159, 64, 1)'
],
borderWidth: 1
}]
},
options: {
scales: {
yAxes: [{
ticks: {
beginAtZero: true
}
}]
}
}
});
You need to define your xAxis as a time cartesian axis with a unit that matches your data. The default display format of 'hour' is 'hA' (for instance '2PM'). You should probably also use the same format for displaying tooltips.
xAxes: [{
type: 'time',
time: {
unit: 'hour',
tooltipFormat: 'hA'
}
}],
Please note that Chart.js uses Moment.js for the functionality of the time axis. Therefore you should use the bundled version of Chart.js that includes Moment.js in a single file.
Please have a look at belo runnable code snippet.
const labels = [1585725538000, 1585729616000, 1585742414000, 1585812498000, 1585842536000, 1585918521000, 1585938665000, 1585948685000];
const datas = [15, 16, 15, 17, 12, 13, 11, 12];
var ctx = document.getElementById('myChart').getContext('2d');
var myChart = new Chart(ctx, {
type: 'line',
data: {
labels: labels,
datasets: [{
label: '# temperature',
data: datas,
backgroundColor: 'rgba(255, 99, 132, 0.2)',
borderColor: 'rgba(255, 99, 132, 1)',
borderWidth: 1
}]
},
options: {
scales: {
xAxes: [{
type: 'time',
time: {
unit: 'hour',
tooltipFormat: 'hA'
}
}],
yAxes: [{
ticks: {
beginAtZero: true
}
}]
}
}
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.9.3/Chart.bundle.js"></script>
<canvas id="myChart" height="90"></canvas>
I am attempting to emphasize a specific value on the X-Axis if it meets a specific condition.
For example, in my codepen I want to only change the font size of the 'blue' bar. Is this even possible with Chart.js?
var ctx = document.getElementById("myChart").getContext('2d');
var myChart = new Chart(ctx, {
type: 'bar',
data: {
labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
datasets: [{
label: '# of Votes',
data: [12, 19, 3, 5, 2, 3],
backgroundColor: [
'rgba(255, 99, 132, 0.2)',
'rgba(54, 162, 235, 0.2)',
'rgba(255, 206, 86, 0.2)',
'rgba(75, 192, 192, 0.2)',
'rgba(153, 102, 255, 0.2)',
'rgba(255, 159, 64, 0.2)'
],
borderColor: [
'rgba(255,99,132,1)',
'rgba(54, 162, 235, 1)',
'rgba(255, 206, 86, 1)',
'rgba(75, 192, 192, 1)',
'rgba(153, 102, 255, 1)',
'rgba(255, 159, 64, 1)'
],
borderWidth: 1
}]
},
options: {
scales: {
yAxes: [{
ticks: {
beginAtZero:true
}
}],
xAxes: [{
ticks: {
//only show large font size for 'Blue'
fontSize: 16
}
}]
}
}
});
Chartjs doesn't have a public api to do this but you can modify internal _ticks on beforeDraw and make the label "Blue" as major: true then that label will be drawn using the major styling in tick configuration options.
Also use this with caution since it relies on internal implementation and thus might break in future releases (very unlikely to happen but just saying).
var ctx = document.getElementById("myChart").getContext('2d');
var myChart = new Chart(ctx, {
type: 'bar',
data: {
labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
datasets: [{
label: '# of Votes',
data: [12, 19, 3, 5, 2, 3],
backgroundColor: [
'rgba(255, 99, 132, 0.2)',
'rgba(54, 162, 235, 0.2)',
'rgba(255, 206, 86, 0.2)',
'rgba(75, 192, 192, 0.2)',
'rgba(153, 102, 255, 0.2)',
'rgba(255, 159, 64, 0.2)'
],
borderColor: [
'rgba(255,99,132,1)',
'rgba(54, 162, 235, 1)',
'rgba(255, 206, 86, 1)',
'rgba(75, 192, 192, 1)',
'rgba(153, 102, 255, 1)',
'rgba(255, 159, 64, 1)'
],
borderWidth: 1
}]
},
options: {
scales: {
yAxes: [{
ticks: {
beginAtZero:true
}
}],
xAxes: [{
ticks: {
fontSize: 16,
major: {
fontSize: 20
}
}
}]
}
},
plugins: [{
beforeDraw: function({ chart }, options) {
chart.boxes
.find(box => box.id === "x-axis-0")
._ticks
.find(tick => tick.label === "Blue")
.major = true;
}
}]
});
<canvas id="myChart"></canvas>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.7.3/Chart.min.js"></script>
PS: Just in case someone is wondering how I know this internal implementation I searched fillText in chartjs github source code and console.log(myChart) xD
Looks like it's not possible according to their docs. You can only do something like uppercase needed label with callback function
xAxes: [{
ticks: {
fontSize: 16,
callback: v => v === 'Blue' ? v.toUpperCase() : v
}
}]
For chartjs 3.0 and higher, it can be done by using scriptable-options. Include it like this into your options for ticks:
options: {
scales: {
x: {
ticks: {
font: {
size: (c) => {
if (c.index==1){
return 20 // at tick label with idx one set fontsize 20
}
else {
return 12 // for all other tick labels set fontsize 12
}
},
},
},
},
},
},
I have a chart.js chart in my app. This is how it looks without negative values:
With negative values:
As you can see I have dual axisY. They work as needed if there are no negative values. But if there are some, right AxisY starts in the incorrect position.
How to make it starts in the same place as left AxisY?
Here is my code:
private buildOptions(): any {
return {
responsive: true,
title: {
display: false,
text: ''
},
tooltips: {
mode: 'index',
intersect: true
},
scales: {
yAxes: [{
position: "left",
id: "y-axis-0",
fontColor: '#fff'
}, {
position: "right",
id: "y-axis-1",
fontColor: '#fff'
}]
},
legend: {
display: true,
labels: {
fontColor: '#fff'
}
}
};
}
Thank you.
Have you tried setting the same min value for both axes?
You can use ticks for specifying it:
ticks: {
min: -5
}
Here's an example snippet I made for you:
var ctx = document.getElementById("myChart").getContext('2d');
var myChart = new Chart(ctx, {
type: 'bar',
data: {
labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
datasets: [{
label: '# of Votes',
data: [12, -5, 3, 5, 2, -3],
backgroundColor: [
'rgba(255, 99, 132, 0.2)',
'rgba(54, 162, 235, 0.2)',
'rgba(255, 206, 86, 0.2)',
'rgba(75, 192, 192, 0.2)',
'rgba(153, 102, 255, 0.2)',
'rgba(255, 159, 64, 0.2)'
],
borderColor: [
'rgba(255,99,132,1)',
'rgba(54, 162, 235, 1)',
'rgba(255, 206, 86, 1)',
'rgba(75, 192, 192, 1)',
'rgba(153, 102, 255, 1)',
'rgba(255, 159, 64, 1)'
],
borderWidth: 1
}]
},
options: {
scales: {
yAxes: [{
position: "left",
id: "y-axis-0",
fontColor: '#fff',
ticks: {
min: -5
}
}, {
position: "right",
id: "y-axis-1",
fontColor: '#fff',
ticks: {
min: -5
}
}]
}
}
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.4.0/Chart.bundle.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div style="width:50%;">
<canvas id="myChart" width="400" height="400"></canvas>
</div>