I want to draw a horizontal reference line at a particular value.
The data is of the format:
{
"Close": 15638.8,
"Date": "2022-06-21T10:00:00.000Z",
"High": 15707.25,
"Low": 15419.85,
"Open": 15455.95,
"Volume": 0,
"id": 36
}
This is what I have figured as of now. I am unsure how to use the refLines attribute.
var dataReqdFormat = {
labels: [],
datasets: [{
data: [],
label: "Nifty",
fill: true,
borderColor: (ctx) => {
const data = ctx.chart.data.datasets[ctx.datasetIndex].data;
return data[0] >= data[data.length - 1] ? 'red' : 'green'
}
}]
};
Any help is appreciated.
You can use the annotation plugin for this:
var options = {
type: 'line',
data: {
labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
datasets: [{
label: '# of Votes',
data: [12, 19, 3, 5, 2, 3],
borderColor: 'pink'
}]
},
options: {
plugins: {
annotation: {
annotations: {
line: {
type: 'line',
yMin: 16,
yMax: 16,
borderWidth: 2,
borderColor: 'red'
}
}
}
}
}
}
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/3.8.0/chart.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/chartjs-plugin-annotation/1.4.0/chartjs-plugin-annotation.js"></script>
</body>
Related
I am working on a project and we are using a chart created with chart js. I want to give the legend a background color (the top part thats drawn in the image). After a lot of searching on the internet i stil havent found a solution to my problem so i thought lets try stack overflow. can some one help me Please??>!
the part i want to give a background color
here is part of my code
enter code here
<div>
<canvas id="myChart"></canvas>
</div>
<script>
const labels = [
'January',
'February',
'March',
'April',
'May',
'June',
];
const data = {
labels: labels,
datasets: [{
label: 'My First dataset',
backgroundColor: 'rgb(255, 99, 132)',
borderColor: 'rgb(255, 99, 132)',
data: [0, 10, 5, 2, 20, 30, 45],
}]
};
const config = {
type: 'line',
data: data,
options: {}
};
var myChart = new Chart(
document.getElementById('myChart'),
config
);
</script>
You can use a custom plugin for this:
const plugin = {
id: 'legendBackground',
beforeDraw: (chart, args, opts) => {
const {
chartArea: {
width,
top,
left
},
ctx
} = chart;
ctx.fillStyle = opts.color || 'transparent';
ctx.fillRect(left, 0, width, top)
}
}
const options = {
type: 'line',
data: {
labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
datasets: [{
label: '# of Votes',
data: [12, 19, 3, 5, 2, 3],
borderColor: 'orange'
}]
},
options: {
plugins: {
legendBackground: {
color: 'pink'
}
}
},
plugins: [plugin]
}
const 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/3.7.1/chart.js"></script>
</body>
Am trying to create bar graph with multiple plots using chartjs and the graph is generated successfully but one of the legend is not showing correctly.
Am using Chartjs 2.9.3 version.
One of the bar legendary is showing as circle instead of rectangle box. Kindly let me know if any workaround to get the correct legendary.
Bar graph show circle in the legendary
var ctx = document.getElementById('myChart');
var myChart = new Chart(ctx, {
type: 'bar',
data: {
datasets: [
{
label: 'Label1',
data: [3,4],
type: 'scatter',
backgroundColor: 'red',
pointStyle:'circle',
pointRadius:5
},
{
label: 'Label2',
data: [1,2],
type: 'scatter',
backgroundColor: 'blue',
pointStyle:'triangle',
pointRadius:5
},
{
backgroundColor: 'grey',
label: 'Label3',
data: [1,2],
borderWidth: 1,
type: 'bar'
}
]
},
options: {
responsive:false,
legend: {
labels : {
usePointStyle: true
}
},
title: {
display: true
},
scales: {
xAxes: [{
gridLines: {
display: false
}
}],
yAxes: [{
ticks: {
beginAtZero: true
},
scaleLabel: {
display: true,
labelString: '$/MWh'
}
}]
}
}
});
If the usePointstyle flag is set in the legend it defaults to the circle. In V2 this is not configurable for bar charts so you have 2 options
You can switch to a html legend and style that. Or you can update to chart.js version 3 where you can configure it for bar charts:
var options = {
type: 'bar',
data: {
labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
datasets: [{
label: '# of Votes',
data: [12, 19, 3, 5, 2, 3],
backgroundColor: 'yellow'
},
{
label: '# of Points',
data: [7, 11, 5, 8, 3, 7],
backgroundColor: 'pink',
pointStyle: 'rect'
}
]
},
options: {
plugins: {
legend: {
labels: {
usePointStyle: true
}
}
}
}
}
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>
Space between column in chart js
There's the screen of my output and what i want to do
enter image description here
Anyone can help please ?
You can achieve this by setting the barPercentage property
Example:
var options = {
type: 'bar',
data: {
labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
datasets: [{
label: '# of Votes',
data: [12, 19, 3, 5, 2, 3],
borderWidth: 1,
backgroundColor: 'blue',
barPercentage: 0.3
},
{
label: '# of Points',
data: [7, 11, 5, 8, 3, 7],
borderWidth: 1,
backgroundColor: 'red',
barPercentage: 0.3
}
]
},
options: {
scales: {
y: {
stacked: true
},
x: {
stacked: true
}
}
}
}
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/3.3.2/chart.js"></script>
</body>
Now i have something like this but i need to add space between each column
I am testing out HighCharts and ChartJS to see which to use. For Highcharts, I was able to find a hack to create a bar chart that had double grouping on the x-axis.
This is what I want to look like:
I am new to both charting JS options and wonder if there is a way to do this in ChartJS.
I have the datasets something like this:
xAxis: {
categories: [{
name: "Total",
categories: ["2004", "2008", "2012"]
}, {
name: "Lower than 2.50",
categories: ["2004", "2008", "2012"]
}]
},
yAxis: {
min: 0,
title: {
text: 'Percent (%)'
}
},
series: [{
name: 'Male',
data: [42.4, 43.0, 43.0, 50.3, 49.4, 48.4]
}, {
name: 'Female',
data: [57.6, 57.0, 57.0, 49.7, 50.6, 51.6]
}]
Essentially I need a nest series on the x-axis and I am open to plugins or code from Github to do this.
You can make use of the Plugin Core API. It offers different hooks that may be used for executing custom code. In below code, I use the afterDraw hook to draw the category labels and the delimiter lines.
new Chart('myChart', {
type: 'bar',
plugins: [{
afterDraw: chart => {
let ctx = chart.chart.ctx;
ctx.save();
let xAxis = chart.scales['x-axis-0'];
let xCenter = (xAxis.left + xAxis.right) / 2;
let yBottom = chart.scales['y-axis-0'].bottom;
ctx.textAlign = 'center';
ctx.font = '12px Arial';
ctx.fillText(chart.data.categories[0], (xAxis.left + xCenter) / 2, yBottom + 40);
ctx.fillText(chart.data.categories[1], (xCenter + xAxis.right) / 2, yBottom + 40);
ctx.strokeStyle = 'lightgray';
[xAxis.left, xCenter, xAxis.right].forEach(x => {
ctx.beginPath();
ctx.moveTo(x, yBottom);
ctx.lineTo(x, yBottom + 40);
ctx.stroke();
});
ctx.restore();
}
}],
data: {
labels: ['2004', '2008', '2012', '2016', '2004', '2008', '2012', '2016'],
categories: ['Total', 'Lower than 2.50'],
datasets: [{
label: 'Male',
data: [42.4, 43.0, 43.0, 50.3, 49.4, 48.4, 51.2, 51.8],
backgroundColor: 'rgba(124, 181, 236, 0.9)',
borderColor: 'rgb(124, 181, 236)',
borderWidth: 1
},
{
label: 'Female',
data: [57.6, 57.0, 57.0, 49.7, 50.6, 51.6, 53.7, 54.6],
backgroundColor: 'rgba(67, 67, 72, 0.9)',
borderColor: 'rgb(67, 67, 72)',
borderWidth: 1
}
]
},
options: {
legend: {
position: 'bottom',
labels: {
padding: 30,
usePointStyle: true
}
},
scales: {
yAxes: [{
ticks: {
min: 0,
max: 80,
stepSize: 20
},
scaleLabel: {
display: true,
labelString: 'Percent (%)'
}
}],
xAxes: [{
gridLines: {
drawOnChartArea: false
}
}]
}
}
});
canvas {
max-width: 400px;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.9.4/Chart.min.js"></script>
<canvas id="myChart" height="200"></canvas>
You have to define a second x-axis and play around with the many ticks and gridLines options.
Please take a look at below runnable code and see how it could be done. This is obviously only a draft and needs to optimized and made more generic.
new Chart(document.getElementById('myChart'), {
type: 'bar',
data: {
labels: ['2004', '2008', '2012', '2004', '2008', '2012'],
datasets: [{
label: 'Male',
data: [42.4, 43.0, 43.0, 50.3, 49.4, 48.4],
backgroundColor: 'rgba(124, 181, 236, 0.9)',
borderColor: 'rgb(124, 181, 236)',
borderWidth: 1
},
{
label: 'Female',
data: [57.6, 57.0, 57.0, 49.7, 50.6, 51.6],
backgroundColor: 'rgba(67, 67, 72, 0.9)',
borderColor: 'rgb(67, 67, 72)',
borderWidth: 1
}
]
},
options: {
legend: {
position: 'bottom',
labels: {
usePointStyle: true
}
},
scales: {
yAxes: [{
ticks: {
min: 0,
max: 80,
stepSize: 20
},
scaleLabel: {
display: true,
labelString: 'Percent (%)'
}
}],
xAxes: [{
gridLines: {
drawOnChartArea: false
}
},
{
offset: true,
ticks: {
autoSkip: false,
maxRotation: 0,
padding: -15,
callback: (v, i) => {
if (i == 1) {
return 'Total';
} else if (i == 4) {
return 'Lower than 2.50';
} else {
return '';
}
}
},
gridLines: {
drawOnChartArea: false,
offsetGridLines: true,
tickMarkLength: 20,
color: ['white', 'white', 'white', 'lightgray', 'white', 'white', 'lightgray']
}
}
]
}
}
});
canvas {
max-width: 400px;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.9.4/Chart.min.js"></script>
<canvas id="myChart" height="200"></canvas>
I'm trying to create a line chart with chart.js but when I try to style my chart.
Everything from options is ignored.
Here is my code:
<canvas id="myChart" width="400" height="400"></canvas>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.8.0/Chart.min.js"></script>
<script>
var ctx = document.getElementById('myChart').getContext('2d');
let ChartOptions = {
responsive: true,
layout: { padding: { top: 12, left: 12, bottom: 12 } },
title: {
display: true,
text: 'Chart.js Line Chart - Cubic interpolation mode'
},
scales: {
xAxes: [{ gridLines: { color: '#22364e', borderDash: [9, 7] } }],
yAxes: [{ gridLines: { display: false } }]
},
plugins: { datalabels: { display: false } },
legend: { display: false },
elements: {
point: { radius: 5 },
line: { tension: 0.4, fill: false },
},
//tooltips: {},
hover: { mode: 'nearest', animationDuration: 400 },
};
var myChart = new Chart(ctx, {
type: 'line',
data: {
labels: ["Fri", "Sun", "Wed", "Thu", "Fri"],
datasets: [
{
fill: false,
borderColor: '#6ebffe',
pointBackgroundColor: '#6ebffe',
pointBorderColor: '#8cff00',
data: [320, 325, 300, 350, 340],
}
],
options: ChartOptions
}
});
</script>
I tried to copy the code from https://www.chartjs.org/samples/latest/charts/line/interpolation-modes.html but it's the same. I can't add options to my chart.
Even the title is not showing. This is not a cache problem because I run it with chrome devtools open and tried with a different browser.
the options are in the wrong place,
they should be placed after the data object
data: {
},
options: ChartOptions
you had them as part of the data object...
data: {
options: ChartOptions
},
see following working snippet...
<canvas id="myChart" width="400" height="400"></canvas>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.8.0/Chart.min.js"></script>
<script>
var ctx = document.getElementById('myChart').getContext('2d');
let ChartOptions = {
responsive: true,
layout: { padding: { top: 12, left: 12, bottom: 12 } },
title: {
display: true,
text: 'Chart.js Line Chart - Cubic interpolation mode'
},
scales: {
xAxes: [{ gridLines: { color: '#22364e', borderDash: [9, 7] } }],
yAxes: [{ gridLines: { display: false } }]
},
plugins: { datalabels: { display: false } },
legend: { display: false },
elements: {
point: { radius: 5 },
line: { tension: 0.4, fill: false },
},
//tooltips: {},
hover: { mode: 'nearest', animationDuration: 400 },
};
var myChart = new Chart(ctx, {
type: 'line',
data: {
labels: ["Fri", "Sun", "Wed", "Thu", "Fri"],
datasets: [
{
fill: false,
borderColor: '#6ebffe',
pointBackgroundColor: '#6ebffe',
pointBorderColor: '#8cff00',
data: [320, 325, 300, 350, 340],
}
]
},
options: ChartOptions
});
</script>