is there any options in chartjs to change baseline value from 0 to other number for example 50, i want use "fill" option and i want sin wave from 0 to 100
if i use -50 to 50 or -100 to +100 range, baseline is 0 and it is OK and work perfect but when i use 0 to 100 center not be 50 and be 0 and fill mode just colored all down part
change baseline value in chartjs from 0 to for example 50
Yes, there is {fill: {value:<value>}}.
(here is the link to the documentation)
Here a short demo, how I would do this:
const data = {
labels: ['E-commerce', 'Enterprise', 'Grey'],
datasets: [{
label: 'random testdata',
data: [12, 19, 5, 3, 3],
fill: {value: 12},
}],
};
const config = {
type: 'line',
data: data,
options: {
maintainAspectRatio: false,
}
};
new Chart(
document.getElementById('chart'),
config
);
<script src="//cdn.jsdelivr.net/npm/chart.js"></script>
<div class="chart" style="height:184px; width:350px;">
<canvas id="chart" ></canvas>
</div>
I should use the fill option, passing the value you want to have as base.
See documentation: https://www.chartjs.org/docs/latest/charts/area.html
In your use case, fill: {value: 50}
const config = {
type: 'line',
data: {
labels: ['January', 'Fabruary', 'March', 'April', 'May', 'June', 'July'],
datasets: [{
data: [50, 35, 45, 47, 21, 13, 27],
fill: {value: 20}
}]
},
options: {
responsive: true,
plugins: {
legend: false,
}
},
};
const ctx = document.getElementById("myChart");
const myChart = new Chart(ctx, config);
.myChartDiv {
max-width: 600px;
max-height: 400px;
}
<script src="https://cdn.jsdelivr.net/npm/chart.js#4.2.1/dist/chart.umd.min.js"></script>
<html>
<body>
<div class="myChartDiv">
<canvas id="myChart" width="600px" height="400px"/>
</div>
</body>
</html>
Related
I am using v 3.8 of Chart.js library and the below is the code:
function createLineGraph(chartObject,chartId,data,labels,xLabel,yLabel) {
// Create a new Chart.js instance
var ctx = document.getElementById(chartId).getContext('2d');
chartObject = new Chart(ctx, {
type: 'line',
data: {
labels: labels,
datasets: data
},
options: {
responsive: true,
scales: {
x: {
ticks:{
display: true,
autoSkip: true,
maxTicksLimit: 10,
},
title: {
display: true,
text: xLabel
},
grid: {
display: false,
text: xLabel
}
},
y: {
beginAtZero: true,
min: 0,
max: 200,
ticks: {
tickSpacing: 50,
autoSkip:true,
},
title: {
display: true,
text: yLabel
},
grid: {
display: false,
}
}
}
}
});
chartObject.update();
}
HTML
<canvas id="chart"></canvas>
Right now it displays like the below:
And Ideally, I am looking something like this:
You can make the visual area of the graph bigger, increasing the size of the Chart with CSS if possible. if that is not possible, you could:
move the legend to the side,
plugins: {
legend: {
position: 'right',
}
},
Make the labels for the x-Axis shorter, since it is a datetime the best way would be setting the x-axis to type time (but you would have to add some libraies, checkout the documentation )
Here a demo, how I would do this:
const data = {
labels: ['2023-01-01 00:00:00','2023-01-01 01:00:00','2023-01-01 02:00:00','2023-01-01 03:00:00','2023-01-01 05:00:00'],
datasets: [{
label: 'Dataset 1',
borderColor: '#36A2EB',
backgroundColor: '#36A2EB',
data: [50, 150, 180, 160, 10],
},{
label: 'Dataset 2',
borderColor: '#FF6384',
backgroundColor: '#FF6384',
data: [20, 110, 80, 190, 20],
}
,{
label: 'Dataset 3',
borderColor: '#4BC0C0',
backgroundColor: '#4BC0C0',
data: [190, 190, 160, 150, 130],
}
,{
label: 'Dataset 4',
borderColor: '#FF9F40',
backgroundColor: '#FF9F40',
data: [100, 100, 150, 100, 100],
}],
};
const config = {
type: 'line',
data: data,
options: {
maintainAspectRatio: false,
plugins: {
legend: {
position: 'right',
},
},
scales: {
x: {
type: 'time',
}
}
}
};
const config1 = {
type: 'line',
data: data,
options: {
maintainAspectRatio: false,
}
};
new Chart(
document.getElementById('chart1'),
config1
);
new Chart(
document.getElementById('chart'),
config
);
new Chart(
document.getElementById('chart2'),
config1
);
<script src="//cdnjs.cloudflare.com/ajax/libs/Chart.js/3.9.1/chart.js"></script>
<script src="//cdn.jsdelivr.net/npm/moment#^2"></script>
<script src="//cdn.jsdelivr.net/npm/chartjs-adapter-moment#^1"></script>
<h2>Before</h2>
<div class="chart" style="height:184px; width:350px;">
<canvas id="chart1" ></canvas>
</div>
<h2>After<h2>
<div class="chart" style="height:184px; width:350px;">
<canvas id="chart" ></canvas>
</div>
<h2>Only changing the CSS height<h2>
<div class="chart" style="height:300px; width:350px;">
<canvas id="chart2" ></canvas>
</div>
I haven't worked with chart.js for some time but as far as I can see the height of the two charts is different, so because of that the line gap is so narrow there. Try experimenting with styling so that you can increase the height and I think that the gap will increase as well.
I am trying to create a horizontal bar chart using Chart.js. It uses 2 data sets. I
want them to start at value 0 in the centre and fan out to 100 in both directions.
In the example shown in the picture below, it does so. However, the value on the left is "-100". My question is how am i able to make the value become 100 instead.
Please refer to the picture as well as the link to the code below.
Horizontal Bar Chart
https://www.chartjs.org/docs/latest/samples/bar/horizontal.html
If I have understood well, you would like to have a dataset, going to the right, and the other one to left.
If true, you should:
set min:-100, max:100 and the ticks.callback, to return the absolute value of ticks in the x scale.
add another x scale (i.e. x2) with min:-100, max:100 and reverse: true. Furthermore this scale shouldn't be visible, therefore set also display: false.
set xAxisID property in the second dataset to the new scale (x2).
const ctx = document.getElementById("myChart");
const myChart = new Chart(ctx, {
type: 'bar',
data: {
labels: ['January', 'Fabruary', 'March', 'April', 'May', 'June', 'July'],
datasets: [{
label: 'user 1 online',
data: [50, 35, 45, 47, 10, 3, 27],
backgroundColor: 'rgba(40, 139, 170, 1)',
borderWidth: 0,
borderSkipped: false,
},
{
label: 'user 2 online',
data: [50, 35, 45, 47, 10, 3, 27],
backgroundColor: 'orange',
borderWidth: 0,
borderSkipped: false,
xAxisID: 'x2'
}]
},
options: {
indexAxis: 'y',
scales: {
x: {
min: -100,
max: 100,
ticks: {
callback(value) {
return Math.abs(value);
}
}
},
x2: {
display: false,
min: -100,
max: 100,
reverse: true
}
}
}
});
.myChartDiv {
max-width: 600px;
max-height: 400px;
}
<script src="https://cdn.jsdelivr.net/npm/chart.js#3.9.1/dist/chart.min.js"></script>
<html>
<body>
<div class="myChartDiv">
<canvas id="myChart" width="600" height="400"/>
</div>
</body>
</html>
I'm new to chart.js, and I have a question about making x-axis labels position to the top.
This is the result that I expected: x-axis labels are on the top.
And this is my attempt:
const ctx = document.getElementById('weather_chart');
const myChart = new Chart(ctx, {
data: {
datasets: [{
type: 'bar',
label: 'rainfall probability',
data: [10, 20, 30, 40],
}, {
type: 'line',
label: 'temperature',
data: [50, 50, 50, 50],
borderColor: '#EB6E4B',
backgroundColor: '#EB6E4B',
}],
labels: ['now', '9am', '10am', '11am', '12pm'],
},
options: {
plugins: {
legend: {
display: false,
},
}
}
});
<script src="https://cdn.jsdelivr.net/npm/chart.js"></script>
<div id="chart">
<canvas id="weather_chart"></canvas>
</div>
If it is possible, would you take your time to write the answer?
Thanks in advance, and if my question is insufficient, I would appreciate it if you could tell me.
You can configure all scale related things like position in this namepsaces: options.scales[scaleId]. For more config options of the scales you can read the documentation: https://www.chartjs.org/docs/master/axes/
const ctx = document.getElementById('weather_chart');
const myChart = new Chart(ctx, {
data: {
datasets: [{
type: 'bar',
label: 'rainfall probability',
data: [10, 20, 30, 40],
}, {
type: 'line',
label: 'temperature',
data: [50, 50, 50, 50],
borderColor: '#EB6E4B',
backgroundColor: '#EB6E4B',
}],
labels: ['now', '9am', '10am', '11am', '12pm'],
},
options: {
scales: {
x: {
position: 'top'
}
},
plugins: {
legend: {
display: false,
},
}
}
});
<script src="https://cdn.jsdelivr.net/npm/chart.js"></script>
<div id="chart">
<canvas id="weather_chart"></canvas>
</div>
inside options > scales > xAxes the xAxes is an array, so we can define multiple axis and there configuration like this:
options:{
scales: {
xAxes: [
{
position: 'top',
ticks: {
maxRotation: 90,
minRotation: 80
}
}
]
}
}
Checkout the example here
https://codepen.io/ganeshbkdm/pen/oNeaOwm
Using the chart.js 3.0.0 beta
It appears they have not yet implemented any way to change the font properties of the labels (
Volume and Month in the self-contained sample below )
I try a couple of methods but it seems like this is just not possible
To be clear it is the labels I want to change the color of - not the title or the datasets.
can anyone confirm this?
<html>
<head>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/3.0.0-beta.12/chart.js"></script>
</head>
<body>
<div id="container" style='background-color:white' >
<canvas id="canvas"></canvas>
</div>
<script>
window.onload = function() {
var ctx = document.getElementById('canvas').getContext('2d');
var chart = new Chart(ctx, {
type: 'bar',
data: {
labels: ['January', 'February', 'March', 'April', 'May', 'June', 'July'],
datasets: [{
data: [ 50, -90, 75, 40, -100, 220, 11 ]
}]
},
options: {
indexAxis: 'y',
plugins: {
legend: {
display: false,
labels:{
fontSize: 20,
fontColor: 'red',
}
},
title: {
display: true,
text: 'Chart.js Horizontal Bar Chart'
},
},
scales: {
x: {
display: true,
scaleLabel: {
display: true,
labelString: 'Volume',
fontColor:'#666',
fontSize: 20,
fontStyle: 'italic'
}
},
y: {
display: true,
scaleLabel: {
display: true,
labelString: 'Month',
fontColor:'#666',
fontSize: 20,
fontStyle: 'bold'
}
}
}
}
});
};
</script>
</body>
</html>
The propertys have changed in naming in v3 see migration guide (https://www.chartjs.org/docs/master/getting-started/v3-migration) and the font docs (https://www.chartjs.org/docs/master/general/fonts) for more info:
Example:
var 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: {
plugins: {
legend: {
labels: {
font: {
size: 20
},
color: '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/3.0.0-beta.12/chart.js" integrity="sha512-KTkh8VBBRBzCXlXeR49sBgmLkU6CE7li47A70NR+yYMKGEDOfQR4L2PEQ3KRXeET8j1U+gSRpRjkAS4tQjTGag==" crossorigin="anonymous"></script>
</body>
On the documentation page of ChartJS, there is exactly a section corresponding to my question, but I cannot understand its instruction. It writes:
If global configuration is used, labels are drawn from one of the
label arrays included in the chart data. If only data.labels is
defined, this will be used. If data.xLabels is defined and the axis is
horizontal, this will be used. Similarly, if data.yLabels is defined
and the axis is vertical, this property will be used. Using both
xLabels and yLabels together can create a chart that uses strings for
both the X and Y axes.
Specifying any of the settings above defines the x axis as type:
category if not defined otherwise. For more fine-grained control of
category labels it is also possible to add labels as part of the
category axis definition. Doing so does not apply the global defaults.
Here is what I have tried:
var options = {
type: "line",
data: {
datasets: [{
label: "My First Dataset",
data: [{
x: 'January',
y: 'A'
}, {
x: 'March',
y: 'B'
}],
fill: false,
borderColor: "rgb(75, 192, 192)",
lineTension: 0.1
}]
},
options: {
scales: {
xAxes: [{
type: 'category',
labels: ['January', 'February', 'March', 'April', 'May', 'June'],
}],
yAxes: [{
type: 'category',
labels: ["A", "B", "C"],
}]
}
}
}
var ctx = document.getElementById('chartJSContainer').getContext('2d');
new Chart(ctx, options);
<body>
<canvas id="chartJSContainer" width="600" height="400"></canvas>
</body>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.4.0/Chart.min.js"></script>
And also this:
var options = {
type: "line",
data: {
xLabels: ["January", "February", "March", "April", "May", "June"],
yLabels: ["A", "B", "C"],
datasets: [{
label: "My First Dataset",
data: [{
x: 'January',
y: 'A'
}, {
x: 'March',
y: 'B'
}],
fill: false,
borderColor: "rgb(75, 192, 192)",
lineTension: 0.1
}]
},
options: {}
}
var ctx = document.getElementById('chartJSContainer').getContext('2d');
new Chart(ctx, options);
<body>
<canvas id="chartJSContainer" width="600" height="400"></canvas>
</body>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.4.0/Chart.min.js"></script>
Unfortunately none of these are working.
Finally I got the solution after many trial-and-errors. I have to say that the documentation of chart.js is quite unclear and should be improved.
My findings are:
xLabels and yLabels approach is not working. There are no clear documentation on these two parameters.
Don't care about setting the type to category. chart.js only accepts numerical values; you have to map the values to strings by using your own callback method.
var options = {
type: "line",
data: {
labels: ['January', 'February', 'March', 'April', 'May', 'June'],
datasets: [{
label: "My First Dataset",
data: [1, 2, 3, 1, 1, 1],
fill: false,
borderColor: "rgb(75, 192, 192)",
lineTension: 0.1
}]
},
options: {
scales: {
yAxes: [{
ticks: {
max: 3,
min: 1,
stepSize: 1,
callback: function(label, index, labels) {
switch (label) {
case 1:
return 'A';
case 2:
return 'B';
case 3:
return 'C';
}
}
}
}]
}
}
}
var ctx = document.getElementById('chartJSContainer').getContext('2d');
new Chart(ctx, options);
<body>
<canvas id="chartJSContainer" width="600" height="400"></canvas>
</body>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.4.0/Chart.min.js"></script>