We Keep Coding

Chart line not appearing in a semi log chart using chart.js

I am using react-chartjs-2 to create a semi log chart using some simple data.
I tried many examples but in the final chart the line isn't drawn nor I see any error in the browser console.
I am using Next.js & Tailwind CSS for this project.
I also tried using the techniques described in the time series charts but those also don't work
I have figured out how to create the axis and ticks , now how do I draw the line ?
Here is my code.
index.js
import {
Chart as ChartJS,
CategoryScale,
LogarithmicScale,
LogarithmicScaleOptions,
LinearScale,
PointElement,
LineElement,
Title,
Tooltip,
Legend,
} from "chart.js";
import { Line } from "react-chartjs-2";
ChartJS.register(
LogarithmicScale,
LinearScale,
PointElement,
LineElement,
Title,
Tooltip,
Legend
);
export const options = {
scales: {
x: {
display: true,
type: "logarithmic",
min: 0.000001,
max: 1,
},
y: {
display: true,
min: 400,
max: 2500,
},
},
responsive: true,
plugins: {
legend: {
position: "top",
},
title: {
display: true,
text: "5W-10R",
},
},
};
const vmax = [2000, 1750, 1500, 1250, 1000, 750, 500];
const tm = [
0.0000125, 0.00001633, 0.00002222, 0.000032, 0.00005, 0.0002, 0.0008,
];
export const data = {
tm,
datasets: [
{
label: "Dataset 1",
data: vmax,
borderColor: "rgb(255, 99, 132)",
backgroundColor: "rgba(255, 99, 132, 0.5)",
},
],
};
export default function Home({}) {
return (
<div className="">
<div className="flex flex-col items-center justify-center min-h-screen py-2">
<main className="flex flex-col items-center w-full flex-1 px-10 ">
<Line options={options} data={data} />
</main>
</div>
</div>
);
}
Result:

You don't pass an option to the labels array, you pass the tm variable which means it will use that as a key, you need to pass it as:
const data = {
labels: tm,
datasets: []
}

Add a gradient background to react-chartjs-2

I am currently trying to add a gradient background with a slight transparency to a radar graph inside a react component. I have only been able to find solutions for this problem by referencing a chartjs canvas within an html file, but no solutions via a react component in a tsx/jsx file.
Desired Result I am looking for, and the
Current Result
The code below is used to achieve the current result.
import { Chart } from 'react-chartjs-2';
import { Chart as ChartJS, LineController, LineElement, PointElement, LinearScale, Title, Filler, RadialLinearScale } from 'chart.js';
ChartJS.register(LineController, RadialLinearScale, LineElement, PointElement, LinearScale, Filler, Title);
const labels = ['Thing 1', 'Thing 2', 'Thing 3', 'Thing 4', 'Thing 5', 'Thing 6'];
const chartData = [5, 3, 4, 5, 2, 4];
const data = {
labels: labels,
datasets: [
{
data: chartData,
fill: true,
backgroundColor: 'pink',
borderColor: 'transparent',
pointBorderColor: 'transparent',
pointBackgroundColor: 'transparent',
},
],
};
const options = {
scales: {
r: {
grid: {
lineWidth: 2,
},
angleLines: {
lineWidth: 2,
},
gridLines: {
display: false
},
ticks: {
display: false,
maxTicksLimit: 1
},
}
}
}
const RadarGraph = () => {
return (
<Chart type="radar" data={data} options={options}/>
)
}
export default RadarGraph;

You will need to use a scriptable function for the backgroundColor which contains the chart which contains the context like so:
const data = {
labels: labels,
datasets: [
{
data: chartData,
fill: true,
backgroundColor: ({chart: {ctx}}) => {
const bg = ctx.createLinearGradient(paramters);
// More config for your gradient
return bg;
}
},
],
};

Error in fill Gradient Color in Line Chart.js

I try to Fill gradient Color in my Line chart but there was some error restricted me from using canvas.
In Code Below there are 3 function: Options contain options of the line chart, Data contain data(i have error in this function), LineChart call and return line chart
import React from "react";
import {
Chart as ChartJS,
CategoryScale,
LinearScale,
PointElement,
LineElement,
Title,
Tooltip,
Legend,
Filler
} from "chart.js";
import { Line } from "react-chartjs-2";
ChartJS.register(
CategoryScale,
LinearScale,
PointElement,
LineElement,
Title,
Tooltip,
Legend,
Filler
);
export const options = {
responsive: true,
maintainAspectRatio: true,
aspectRatio: 1,
plugins: {
legend: {
position: "top",
display: false,
},
title: {
display: true,
text: "Calories Friend Ranking",
},
},
backgroundColor: "#fff",
borderColor: "#fff",
};
export const data = (canvas) => {
const ctx = canvas.getContext("2d");
const gradient = ctx.createLinearGradient(0, 0, 0, 400);
gradient.addColorStop(0, 'rgba(250, 61, 0 ,1)');
gradient.addColorStop(1, 'rgba(250, 61, 0 ,0)');
return {
labels: ["0","cuong","hien"],
datasets: [
{
backgroundColor : gradient,
borderColor : "rgba(250, 61, 0, 1)",
tension: 0.4,
fill: 'start',
data : [0,500,2000]
}
]
}
}
export default function LineChart(props) {
let { RankData } = props;
var NameLabels = ["0"]
var CaloriesDatas = [0]
for (var i = RankData.length - 1; i >= 0; i--) {
NameLabels.push(RankData[i].displayName)
CaloriesDatas.push(RankData[i].carloriesBurned)
}
//error in data function :"Property 'datasets' is missing in type '(canvas: any) =>.."
return (<Line data={data} options={options} />);
}
I have error in function Data "Here is the error that i met"

make horizontal graph with percentage :react js

I trying to make a horizontal chart with react-chartjs i want each data to show the percentage
import React, { Component } from "react";
import { HorizontalBar } from "react-chartjs-2";
export default class Button extends Component {
render() {
const dataHorBar = {
labels: ["January", "February", "March", "April", "May", "June", "July"],
datasets: [
{
label: "My First dataset",
backgroundColor: "#EC932F",
borderColor: "rgba(255,99,132,1)",
borderWidth: 1,
hoverBackgroundColor: "rgba(255,99,132,0.4)",
hoverBorderColor: "rgba(255,99,132,1)",
data: [65, 59, 80, 81, 56, 55, 40]
}
]
};
return (
<div>
<HorizontalBar data={dataHorBar} />
</div>
);
}
}
Here is the code of what I have tried
https://codesandbox.io/s/react-chartjs-bar-horizontal-bar-forked-be9wil
I also want to remove the background lines and make the graph more rounded edge

In order to use the feature for having rounded rectangles, you need to update to the v3 of chartjs, therefore, the following code will be working only on this version. But you can adapt it to a previous version, you will just not be able to change the border radius of the rectangle.
You can use the datalabels plugin, in order to display custom text in your chart, and format the label like this:
options: {
plugins: {
datalabels: {
formatter: value => value + " %", // Add the percentage after the value
align: "end",
anchor: "end",
clip: true,
}
}
}
For the shapes, you can use the option borderRadius, to have rounded edges. You can find more information here, but in the end, you just have to specify a value for the borderRadius, in each dataset:
datasets: [
{
label: "My First dataset",
backgroundColor: "#EC932F",
borderColor: "rgba(255,99,132,1)",
borderWidth: 1,
hoverBackgroundColor: "rgba(255,99,132,0.4)",
hoverBorderColor: "rgba(255,99,132,1)",
data: [65, 59, 80, 81, 56, 55, 40],
borderRadius: 50, // Give a number
}
]
Finally, for removing the grid lines, you can use this snippet, and pass those options to your chart
options: {
scales: {
x: {
grid: {
display: false // Hide x grid
}
},
y: {
grid: {
display: false // Hide y grid
}
}
}
};
That's it for the ground principle. Here is a live working example, if you really wants to see how to implement it.

chart js 2 how to set bar width

I'm using Chart js version: 2.1.4 and I'm not able to limit the bar width. I found two options on stackoverflow
barPercentage: 0.5
or
categorySpacing: 0
but neither of one works with the mentioned version. Is there a way to solve this issue without manually modifying the chart.js core library?
thanks

You were right : The attribute you have to edit is barPercentage.
But maybe the error comes from where you edited the value.
As you can see in the bar chart options :
Name : barPercentage
- Type : Number
- Default : 0.9
- Description : Percent (0-1) of the available width each bar should be within the category percentage. 1.0 will take the whole category width and put the bars right next to each other. Read More
The attribute is actually stored in scales.xAxes ("Options for xAxes" table).
So you just have to edit your chart this way :
var options = {
scales: {
xAxes: [{
barPercentage: 0.4
}]
}
}
Here is a fully working example with a custom width (0.2) for the bar :
var data = {
labels: ["January", "February", "March", "April", "May", "June", "July"],
datasets: [{
label: "My First dataset",
backgroundColor: "rgba(75,192,192,0.4)",
borderColor: "rgba(75,192,192,1)",
data: [65, 59, 75, 81, 56, 55, 40],
}]
};
var ctx = document.getElementById("myChart");
var myChart = new Chart(ctx, {
type: 'bar',
data: data,
options: {
scales: {
yAxes: [{
ticks: {
beginAtZero: true
}
}],
xAxes: [{
// Change here
barPercentage: 0.2
}]
}
}
});
console.log(myChart);
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.1.6/Chart.js"></script>
<canvas id="myChart"></canvas>
Update (Chart.js Version 2.2.0+)
As stated in the Release Version 2.2.0 - Candidate 2 :
Enhancements
Can now manually configure the thickness of a bar in a bar chart. Use a new barThickness option on the correct axis to set the thickness of a bar.
And so on ...

For version 2.8+ (and apparently as far back as 2.2), there are now some excellent controls over the bar thickness, max thickness, etc.
Per the Chart.js documentation, you would set them like so:
{
type: 'bar', // or 'horizontalBar'
data: ...,
options: {
scales: {
xAxes: [{
barThickness: 6, // number (pixels) or 'flex'
maxBarThickness: 8 // number (pixels)
}]
}
}
}

As of v2.7.2 it can be done by:
scales: {
xAxes: [{
maxBarThickness: 100,
}],
}

In case if you are using ng2-chart in an angular project then the bar chart configuration looks Alike this:
npm install ng2-charts chart.js --save
import 'ng2-charts' in your module.
import { ChartsModule } from 'ng2-charts';
Now the bar chart configurations:
barChartOptions: ChartOptions = {
responsive: true,
maintainAspectRatio: false,
legend: {
display: false
},
};
barChartLabels: Label[] = ['2006', '2007', '2008', '2009', '2010', '2011', '2012'];
barChartType: ChartType = 'bar';
barChartLegend = true;
barChartPlugins = [];
barChartData: ChartDataSets[] = [
{
barThickness: 16,
barPercentage: 0.5,
data: [65, 59, 80],
label: 'Growth'
},
{
barThickness: 16,
barPercentage: 0.5,
data: [28, 48, 40],
label: 'Net'
}
];
barChartColors: Color[] = [
{ backgroundColor: '#24d2b5' },
{ backgroundColor: '#20aee3' },
];
Now the HTML part:
<div class="bar-chart-wrapper">
<canvas baseChart [datasets]="barChartData" [colors]="barChartColors"
[labels]="barChartLabels"
[options]="barChartOptions" [plugins]="barChartPlugins" [legend]="barChartLegend"
[chartType]="barChartType">
</canvas>
</div>
You can control the height of your chart container
.bar-chart-wrapper {
height: 310px;
}

barThickness and maxBarThickness (previously in ChartOptions[]) are now a part of ChartDataSets[].

As per above answer
Here is complete Bar chart graph using react chartjs2.
import React from 'react';
import {
Chart as ChartJS,
CategoryScale,
LinearScale,
BarElement,
Title,
Tooltip,
Legend,
} from 'chart.js';
import { Bar } from 'react-chartjs-2';
ChartJS.register(
CategoryScale,
LinearScale,
BarElement,
Title,
Tooltip,
Legend
);
export const options = {
responsive: true,
plugins: {
legend: {
position: 'top', // lable position left/right/top/bottom
labels: {
boxWidth: 0, // lable box size
}
},
},
elements: {
point: {
radius: 1
}
},
scales: {
x: {
display: false, // show/ hide x-axis
grid: {
display: false // show/hide grid line in x-axis
},
},
y: {
display: false, // same as x-axis
grid: {
display: false
}
}
}
};
const labels = ['January', 'February', 'March', 'April', 'May', 'June', 'July'];
export const data = {
labels,
datasets: [
{
label: 'datasets', // label text
data: [100, 300, 500, 700],
backgroundColor: '#7b62ff', // bar / column color
barThickness: 6, // <<<<<<<<<<<< bar / column size
},
],
};
export default function ResumesGraph() {
return (
<div>
<Bar
data={data}
options={options}
width={'500px'}
height={'180px'}
/>
</div>
);
}

Try this
import {Chart} from "chart.js"
Chart.defaults.datasets.bar.maxBarThickness = 73;
//also try barPercentage

For those who are interested, i made a quick fork based on 3.9 branch to manage dynamic width :
https://github.com/stephanebouget/Chart.js/tree/3.9
For example :
Live demo
https://codepen.io/stephanebouget/pen/PoerxPP
var data = {
datasets: [{
label: 'Dataset #1',
backgroundColor: 'rgba(255,99,132,0.2)',
borderColor: 'rgba(255,99,132,1)',
borderWidth: 1,
hoverBackgroundColor: 'rgba(255,99,132,0.4)',
hoverBorderColor: 'rgba(255,99,132,1)',
data: [65, 59, 20, 81, 56, 55, 40],
setPercentage: [10, 2, 20, 40, 4, 6, 18], // Here is the magic !!!
}],
};