Calling a helper function and passing in data to chart.js - reactjs

I created a helper function to work around my chart.js.
First, on my index.html file I put the ff:
<div id="app"></div>
<canvas id="myChart" width="400" height="400"></canvas>
Next, to call chart.js, I created a helper function with the necessary data/arguments on it:
export const chartUI = (labels, data) =>{
var ctx = document.getElementById("myChart");
var myChart = new Chart(ctx, {
type: 'line',
data: {
labels: labels,
datasets: [{
label: 'RATES',
data: data,
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
}
}]
}
}
});
};
Now on my component where I need to put my data on I called the function so it can manipulate and display the data:
import React from 'react';
const helper = require('../../../helpers/utils')
const Chart = (props) => {
return(
<div>
{props.info.map(item => {
return <p>{helper.chartUI(item.time, item.rates)}</p>
}) }
</div>
)
};
export default Chart;
When I run this code i did not see any chart on the frontend and also I got this error: Uncaught TypeError: this.ticks.map is not a function The above error occurred in the <Chart> component: TypeError: this.ticks.map is not a function
PS. Here's the the type data I am flowing from my app:
{
"rates": [
{
"time": "2018-04-13T15:45:19.5968204Z",
"asset_id_quote": "$$$",
"rate": 4000000
},
{
"time": "2018-04-13T15:45:41.7725202Z",
"asset_id_quote": "1ST",
"rate": 37714.501225721289835941919668
}
}

Related

Uncaught Error: "category" is not a registered scale

I am trying to implement React char but getting this error, I search and follow decumentation but couldn't find the solution.
import React from 'react';
import { Bar } from 'react-chartjs-2';
const BarChart = () => {
return (
<div>
<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
}]
}} />
</div>
);
};
export default BarChart;
Change your code to:
import { Bar } from 'react-chartjs-2';
import { Chart, registerables } from 'chart.js';
Chart.register(...registerables);
const BarChart = () => { ... your code ... }
As described in https://www.chartjs.org/docs/3.3.0/getting-started/integration.html#bundlers-webpack-rollup-etc you need to register all the components you're going to use.
The above code just registers everything.
Check out the link for all available components you can register.

How do I filter & update dates using react-chartjs-2

I am using React-Chartjs-2 on a project and am getting stuck on updating the filter of my chart. I am following along with the following demo, but this doesn't just the react one, but the vanilla version.https://www.youtube.com/watch?v=Gc5JF2TUG7o&t=679s # 16:32 is the update function to update the filtered dates on the chart. I am able to get the index of the date array, but my chart doesn't update. How am I able to access and update the labels and datasets value within the Line component?
import React from 'react';
import {Line} from 'react-chartjs-2'
function BarChart() {
const dates = ['2021-08-25', '2021-08-26','2021-08-27','2021-08-28', '2021-08-29', '2021-08-30','2021-08-31' ];
const datapoints =[1,2,4,9,12,15,16]
function filterData() {
const dates2 = [...dates];
console.log(dates2);
const startdate = document.getElementById('startdate');
const enddate = document.getElementById('enddate');
//get the index number in the array
const indexstartdate = dates2.indexOf(startdate.value);
const indexenddate = dates2.indexOf(enddate.value);
console.log(indexstartdate);
console.log(indexenddate);
//slice the array
const filterDate = dates2.slice(indexstartdate, indexenddate + 1);
//replace label in the chart
//HELP HERE!!!
}
return (
<div>
<div>
<Line id='myChart'
data={{
labels:dates,
datasets: [
{
label: 'Sales',
data:datapoints,
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,
},
],
}}
height={400}
width={400}
options={{maintainAspectRatio:false,
scales: {
yAxes: [
{
ticks: {
beginAtZero: true,
}
}
]
},
}}
/>
</div>
<input type='date' onChange={filterData} id='startdate' />
<input type='date' onChange={filterData} id='enddate' />
</div>
)
}
export default BarChart
You need to use the React state so your component will rerender. Here is my solution, I hope it helps.
import React, { useRef, useState } from "react";
import { Line } from "react-chartjs-2";
function BarChart() {
const initialDates = [
"2021-08-25",
"2021-08-26",
"2021-08-27",
"2021-08-28",
"2021-08-29",
"2021-08-30",
"2021-08-31",
];
const initialDataPoints = [1, 2, 4, 9, 12, 15, 16];
const [dates, setDates] = useState(initialDates);
const [dataPoints, setDataPoints] = useState(initialDataPoints);
console.log(dates, dataPoints);
const inputRef1 = useRef();
const inputRef2 = useRef();
function filterData() {
const dates2 = [...dates];
const dataPoints2 = [...dataPoints];
//slice the array
let value1 = inputRef1.current.value;
let value2 = inputRef2.current.value;
const indexstartdate = dates2.indexOf(value1);
const indexenddate = dates2.indexOf(value2);
console.log(indexstartdate);
console.log(indexenddate);
//slice the array
const filterDate = dates2.slice(indexstartdate, indexenddate + 1);
const filterDataPoints = dataPoints2.slice(
indexstartdate,
indexenddate + 1
);
console.log(filterDate, filterDataPoints);
//replace label in the chart
//HELP HERE!!!
setDates(filterDate);
setDataPoints(filterDataPoints);
console.log(dates, dataPoints);
}
return (
<div>
<div>
<Line
id="myChart"
data={{
labels: dates,
datasets: [
{
label: "Sales",
data: dataPoints,
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,
},
],
}}
height={400}
width={400}
options={{
maintainAspectRatio: false,
scales: {
yAxes: [
{
ticks: {
beginAtZero: true,
},
},
],
},
}}
/>
</div>
<input type="date" ref={inputRef1} />
<input type="date" ref={inputRef2} />
<button onClick={filterData}>Filter</button>
</div>
);
}
export default BarChart;

How to update Chartjs in Reactjs?

I am using react hooks to create chart using chartjs. With the help of socket.io, the webapp is receiving data from a nodejs server. The data gets successfully added to temp and time array, but unfortunately i am unable to update the chart everytime new data comes.
import React,{useState, useEffect} from 'react';
import logo from './logo.svg';
import './App.css';
import {Line} from 'react-chartjs-2';
import io from 'socket.io-client'
const socket = io('http://localhost:5000');
function App() {
const [chartData, setChartData] = useState({});
const [dataReact, setData] = useState({});
var temp =[];
var time = [];
const chart = ()=>{
setChartData({
labels: time,
datasets: [{
label: '# of Votes',
data: temp,
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
}]
})
}
useEffect(()=>{
socket.on('data1', res => {
console.log(res);
temp.push(res.IotData.temperature);
time.push(res.MessageDate);
});
chart();
},[])
return (
<div className="App">
<Line data={chartData}/>
</div>
);
}
export default App;
In useEffect() the second parameter (i.e. the []) which is an array of properties to be observed within the scope of the stateless component. Whenever any of them are updated, the function is executed again. So add chart into the empty array.
Also don't forget to put redraw parameter in your chart:
<Line data={chartData} redraw={true}/>
This will allow the chart to update and be redrawn.

how to show ng-repeat in angular

I have JSON list data from API, it called by
$scope.link = globalVar.folderAPI+"/web/data.php";
$http.get($scope.link).then(function(response){
$scope.listDataitem = response.data.respone;
})
i want to show the data period to chart
this bellow I've wrote, but it still cannot appear, how to make the data display on chart, how can I parse the data to chart script part
<script>
var ctx = document.getElementById("myChart");
var myChart = new Chart(ctx, {
type: 'bar',
data: {
labels: [<div ng-repeat=" x in listDataitem "> {{ x.period }} </div>],
datasets: [{
data: [<div ng-repeat="y in listDataitem"> {{ y.sales}} </div>],
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 can try redraw your chart every time your API will be called.
$scope.link = globalVar.folderAPI+"/web/data.php";
$http.get($scope.link).then(function(response) {
$scope.listDataitem = response.data.respone;
let myLabels = [];
let myDataset = [];
for(let i = 0; i< $scope.listDitaitem); i++) {
myLabels.push($scope.listDitaitem[i].period);
myDataset.push($scope.listDitaitem[i].sales);
}
var ctx = document.getElementById("myChart");
var myChart = new Chart(ctx, {
type: 'bar',
data: {
labels: myLabels,
datasets: [{
data: myDataset,
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
}
}]
}
}
});
})

Why is chart.js not working with angular JS

I am trying to create a chart component in AngularJS (v1.5.8) but for some odd reason chart.js is not getting initialized. http://codepen.io/flyinggambit/pen/eBYezK
angular.module("dashboard", [])
.component("exceptionChart", {
template: "<canvas width='200' height='200' class='{{$ctrl.class}}'></canvas>",
bindings: {
class: '#'
},
controller: function($element) {
this.$postLink = function() {
// code for chart
var ctx = $element.find('canvas')[0];
var myChart = new Chart(ctx, {
type: 'bar',
data: {
labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
datasets: [{
label: '# of Votes',
data: [12, 19, 3, 5, 2, 3],
backgroundColor: [
'rgba(255, 99, 132, 0.2)',
'rgba(54, 162, 235, 0.2)',
'rgba(255, 206, 86, 0.2)',
'rgba(75, 192, 192, 0.2)',
'rgba(153, 102, 255, 0.2)',
'rgba(255, 159, 64, 0.2)'
],
borderColor: [
'rgba(255,99,132,1)',
'rgba(54, 162, 235, 1)',
'rgba(255, 206, 86, 1)',
'rgba(75, 192, 192, 1)',
'rgba(153, 102, 255, 1)',
'rgba(255, 159, 64, 1)'
],
borderWidth: 1
}]
},
options: {
scales: {
yAxes: [{
ticks: {
beginAtZero: true
}
}]
}
}
});
}
}
});
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.5.8/angular.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.3.0/Chart.bundle.min.js"></script>
<div ng-app="dashboard">
<exception-chart class=""></exception-chart>
</div>
<canvas id="myChart" width="200" height="200"></canvas>
However the code for the same works in vanilla JS. http://codepen.io/flyinggambit/pen/MbWOmG
What is the reason for this ? How can I fix this ?
You can't have the canvas as the root element and then try to access it in the way you're doing it.
Wrap it in another div to quickly solve your problem:
"<div><canvas width='200' height='200' class='{{$ctrl.class}}'></canvas></div>"

Resources