I struggle to let my second y-Axis scale to my second data array.
The green data should be scaled according to the right y-Axis (not working).
The red data is correctly scaled to the left y-Axis.
<div id="chartWrapper" class="card-content column is-two-thirds">
<canvas id="myChart" height="250px"></canvas>
<script>
const ctx = document.getElementById('myChart').getContext('2d');
const myChart = new Chart(ctx, {
type: 'line',
data: {
labels: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23],
datasets: [{
label: 'Temperatur in C°',
yAxisID: 'A',
borderColor: "red",
data: 0
},
{
label: 'Niederschlagsmenge in mm',
yAxisID: 'B',
borderColor: "blue",
data: 0
}]
},
options: {
scales: {
A: {
type: 'linear',
beginAtZero: false,
position: 'left',
display: true
},
B: {
type: 'linear',
beginAtZero: false,
position: 'right',
display: true
}
}
}
});
</script>
</div>
Don't be confused with the data being 0, I add the data dynamically.
Thank you very much for any help.
This is because you are using V2 of chart.js in which the scales need to be configured as arrays like so:
new Chart(ctx, {
type: 'line',
data: {},
options: {
scales: {
yAxes: [{
id: 'A'
}, {
id: 'B'
}]
}
}
})
Related
I cannot get the annotation line to work on a stacked Bar Chart.
Example JS Fiddle: https://jsfiddle.net/cledwyn/rd5q6Lsz/10/
I have the standard Annotation per https://www.chartjs.org/chartjs-plugin-annotation/latest/samples/charts/bar.html
const annotation2 = {
type: 'line',
scaleID: 'x',
borderWidth: 3,
borderColor: 'black',
value: 8,
label: {
rotation: 'auto',
position: 'start',
backgroundColor: 'black',
content: 'Line at x=Label 5',
enabled: true
}
};
but when I stack the bar charts
scales: {
xAxes: { stacked: true },
yAxes: { stacked: true }
},
then the annotation line just goes from one corner of the chart to the other.
When running your JSFiddle, you can see the following warning on the console.
"No scale found with id 'x' for annotation 'annotation2'"
Therefore, changing scales.xAxes to scales.x should solve part of your problem.
scales: {
x: { stacked: true },
y: { stacked: true }
}
You'll further have to add missing labels to data.labels and adjust annotation2.value.
Please take a look at your amended code below and see how it works.
const labels = ['Label 1', 'Label 2', 'Label 3', 'Label 4', 'Label 5'];
const data = {
labels: labels,
datasets: [{
label: 'one',
data: [14, 21, 4, 5, 7],
backgroundColor: 'rgb(255, 99, 132)'
}, {
label: 'two',
data: [1, 3, 2, 4, 5],
backgroundColor: 'rgb(255, 199, 132)'
}, {
label: 'three',
data: [7, 1, 9, 6, 7],
backgroundColor: 'rgb(255, 99, 32)'
}]
};
const annotation2 = {
type: 'line',
scaleID: 'x',
borderWidth: 3,
borderColor: 'black',
value: 4,
label: {
rotation: 'auto',
position: 'start',
backgroundColor: 'black',
content: 'Line at x=Label 5',
enabled: true
}
};
const config = {
type: 'bar',
data: data,
options: {
plugins: {
annotation: {
annotations: {
annotation2,
}
}
},
scales: {
x: {
stacked: true
},
y: {
stacked: true
}
},
},
};
const chart = new Chart('chart', config);
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/3.8.0/chart.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/chartjs-plugin-annotation/1.4.0/chartjs-plugin-annotation.min.js"></script>
<canvas id="chart" height="110"></canvas>
Suppose x1={1,4,7,9} | y1={10,20,35,40} and x2={2,3,6,9} | y2={15,23,30,35}. Now I want to draw a line chart in chart.js for it.
P.S. Scatter chart is not a solution because my website is generating data dynamically so I have to provide data in array only and scatter requires the data in very sophisticated manner.
My simple question is by any way, can we have different x axis points in line chart for different lines??
code for your reference:
<!DOCTYPE html>
<html>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.9.4/Chart.js"></script>
<body>
<canvas id="myChart" style="width:100%;max-width:600px"></canvas>
<script>
var xValues1 = [50,60,70,80,90,100,110,120,130,140,150];
var yValues1 = [7,8,8,9,9,9,10,11,14,14,15];
var xValues2 = [54,64,74,84,94,104,114,124,134,144,154];
var yValues2 = [8,9,9,10,10,10,11,12,15,15,16];
new Chart("myChart", {
type: "line",
data: {
labels: xValues1,
datasets: [{
fill: false,
backgroundColor: "rgba(0,0,255,1.0)",
borderColor: "rgba(0,0,255,0.1)",
data: yValues1
},
{
fill: false,
backgroundColor: "rgba(0,0,255,1.0)",
borderColor: "rgba(0,0,255,0.1)",
data: yValues2
}
]
},
options: {
legend: {display: false},
scales: {
yAxes: [{ticks: {min: 6, max:16}}],
}
}
});
</script>
</body>
</html>
(for yvalues2, I want xvalues2)
You can add a second X axis for your other labels:
const xValues1 = [50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150];
const yValues1 = [7, 8, 8, 9, 9, 9, 10, 11, 14, 14, 15];
const xValues2 = [54, 64, 74, 84, 94, 104, 114, 124, 134, 144, 154];
const yValues2 = [8, 9, 9, 10, 10, 10, 11, 12, 15, 15, 16];
const options = {
type: 'line',
data: {
datasets: [{
label: '# of Votes',
data: yValues1,
borderColor: 'pink'
},
{
label: '# of Points',
data: yValues2,
borderColor: 'orange',
xAxisID: 'x2' // Match dataset to other axis
}
]
},
options: {
scales: {
xAxes: [{
type: 'category',
labels: xValues1,
id: 'x',
display: true // Set to false to hide the axis
},
{
type: 'category',
labels: xValues2,
id: 'x2',
display: true // Set to false to hide the axis
}
]
}
}
}
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/2.9.4/Chart.js"></script>
</body>
I'm wondering if it is possible to have a graph with multiple lines, but I want one of the lines to start from the middle of the graph, while the rest of the lines still start from all the way at the left. Is this possible? It'd look like this:
The green line is what I am talking about, whether it would be possible for a dataset to start from not all the way at the left
Yes this is possible, you can achieve this in 2 ways, 1 is to specify each datapoint using its x and y coordinate another one is to place some null values in the start of your data array:
var options = {
type: 'line',
data: {
labels: [1, 2, 3, 4, 5, 6],
datasets: [{
label: '# of Votes',
data: [12, 19, 3, 5, 2, 3],
borderColor: 'pink'
},
{
label: '# of Points',
data: [{
x: 3,
y: 6
}, {
x: 4,
y: 8
}, {
x: 5,
y: 2
}, {
x: 6,
y: 12
}],
borderColor: 'orange'
},
{
label: '# of Points2',
data: [null, null, null, 9, 13, 15],
borderColor: 'lightblue'
}
]
},
options: {
scales: {
yAxes: [{
ticks: {
reverse: false
}
}]
}
}
}
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>
You can quickly do this with offset option.
Example:
const options = {
...otherChartOptions,
scales: {
x: {
offset: true
},
y: {
offset: true
}
}
};
Reference: https://www.chartjs.org/docs/latest/axes/cartesian/linear.html
I'm trying to make a Chart.js with a dynamic x-axis that will always use the next 7 months as the ticks for the x-axis.
But I'm having two problems:
The lines are not showing on my graph
The x-axis is only showing the first and last month, none of the months in-between.
Here is an example I made in paint to show what I'm trying to achieve:
And here is the code I have so far:
/* Build the charts */
var ctx = document.getElementById('ROIchart').getContext('2d');
var chart = new Chart(ctx, {
// The type of chart we want to create
type: 'line',
// The data for our dataset
data: {
datasets: [{
label: 'Paid Search and Leads',
backgroundColor: 'red',
borderColor: 'red',
data: [10, 10, 10, 10, 10, 10, 10],
}, {
label: 'SEO and Content',
backgroundColor: 'green',
borderColor: 'green',
data: [0, 2, 8, 21, 57, 77, 100],
fill: true,
}]
},
// Configuration options go here
options: {
responsive: true,
scales: {
xAxes: [{
type: 'time',
time: {
unit: 'month'
}
}]
}
}
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.9.3/Chart.bundle.min.js"></script>
<canvas id="ROIchart"></canvas>
With the moment.js library, you can look at the length of your array, and from a starting month generate the months, and then put them as labels
/* Build the charts */
var ctx = document.getElementById('ROIchart').getContext('2d');
var array1 = [10, 10, 10, 10, 10, 10, 10];
var months = []
for (let i = 0; i < array1.length; i++) {
months.push(moment().year(2020).month(i+1).date(0).startOf('month'))
}
var chart = new Chart(ctx, {
type: 'line',
data: {
labels: months,
datasets: [{
label: 'Paid Search and Leads',
backgroundColor: 'red',
borderColor: 'red',
data: array1,
}, {
label: 'SEO and Content',
backgroundColor: 'green',
borderColor: 'green',
data: [0, 2, 8, 21, 57, 77, 100],
fill: true,
}]
},
options: {
responsive: true,
scales: {
xAxes: [{
type: 'time',
time: {
unit: 'month'
}
}]
}
}
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.9.3/Chart.bundle.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.24.0/moment.js"></script>
<canvas id="ROIchart"></canvas>
Using chartjs, I setup the following chart:
function myFunction(){
var options = {
type: 'line',
data: {
labels: ["1", "2", "3", "4", "5"],
datasets: [
{
data: [26, 26, 29, 28, 29],
borderWidth: 2,
fill: false,
lineTension: 0
},
{
data: [26, 26, 33, 28, 30],
borderWidth: 2,
fill: false,
lineTension: 0,
}
]
},
options: {
scales: {
yAxes: [{
display: false,
ticks: {
suggestedMin: 0,
beginAtZero: true
}
}]
}
}
}
var ctx = document.getElementById('chartJSContainer').getContext('2d');
new Chart(ctx, options);
}
I want to move the points and the x-axis numbers to the right, sothat they are positioned between the axis lines. (like: 1 between 1 and 2; 2 between 2 and 3; etc.) See below:
How can I do this?
Here is how you can do this :
ꜰɪʀꜱᴛ
Set default chart type to bar , like so :
var options = {
type: 'bar',
data: {
...
ꜱᴇᴄᴏɴᴅ
Set first dataset's type to line , as such :
...
datasets: [{
type: 'line',
data: [26, 26, 29, 28, 29],
...
ᴡᴏʀᴋɪɴɢ ᴇxᴀᴍᴘʟᴇ ⧩
function myFunction() {
var options = {
type: 'bar',
data: {
labels: ["1", "2", "3", "4", "5"],
datasets: [{
type: 'line',
data: [26, 26, 29, 28, 29],
borderColor: 'rgba(0, 119, 220, 1)',
borderWidth: 2,
fill: false,
lineTension: 0
}, {
data: [26, 26, 33, 28, 30],
borderWidth: 2
}]
},
options: {
scales: {
yAxes: [{
display: false,
ticks: {
suggestedMin: 0,
beginAtZero: true
}
}]
}
}
}
var ctx = document.getElementById('chartJSContainer').getContext('2d');
new Chart(ctx, options);
}
myFunction();
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.6.0/Chart.min.js"></script>
<canvas id="chartJSContainer"></canvas>