react-chartjs integration error. Cannot read property 'xLabels' of undefined - javascript

I am getting this error while setting up react-chartjs, i am using example given here .
This is the error i am getting:
Uncaught (in promise) TypeError: Cannot read property 'xLabels' of undefined
at updatePoints (core.js:127)
at Object.classData.componentWillReceiveProps (core.js:48)
...... so on
In this post they said they have fixed it already, but they did't i think.
Here is my code:
var Chart = require('chart.js');
var LineChart = require("react-chartjs").Line;
export default class Dashboard extends Component {
constructor(props){
super(props);
var result = '';
this.state = {
chartData: '',
chartOptions: ''
};
}
componentDidMount(){
var chartData = {
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
}]
}
var chartOptions = {
scales: {
yAxes: [{
ticks: {
beginAtZero:true
}
}]
}
}
this.setState({
chartData: chartData,
chartOptions: chartOptions
})
}
render () {
return (
<div className="container">
<div className="chart-wrapper">
<LineChart data={this.state.chartData} width="600" height="250"/>
</div>
</div>
)
}
}
What could be the issue? i am new to react and stuck with charts. Any help would be appreciated.


"redraw" should help:
<LineChart data={this.state.chartData} width="600" height="250" redraw/>

Related

How to make chart for ethereum smart contract

I have here a smart contract and a I want to make a chart for this smart Contract address
0xE462CbEE0cd420f6c199B0194B1D8D93Fb5e7720 and for "total supply"
I want the chart to update as soon as a transaction goes in our out
How can i implement this in chartjs?
I have here the html canvas
<canvas id="myChart" width="400" height="400"></canvas>
and than the js file with this
var ctx = document.getElementById('myChart').getContext('2d');
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
}
}]
}
}
});
//and here is the data from my smart contract
var supply = await contract.methods.totalSupply().call()
// and than i output it in my UI like this
document.getElementById('contractBalanceSnet').innerHTML = supply/100000000
How can i now use the data totalSupply for the chart?

Integrate chart.js with single javascript file

I am implementing an application with codeigniter framework, I want to produce charts with Chart.JS, I have a controller an array with the data and I intend to send them to the javascript file with the graph implementation, and show everything in the view, but I can not pass the data.
Controller
function index() {
$data['DT'] = $this->Dashboard_main_model->get_dt_in();
$data['CL'] = $this->Dashboard_main_model->get_cl_in();
$data['MT'] = $this->Dashboard_main_model->get_mt_in();
$data['SN_AU'] = $this->Dashboard_main_model->get_sn_au_in();
$data['SN_AT'] = $this->Dashboard_main_model->get_sn_at_in();
$data['SN_MR'] = $this->Dashboard_main_model->get_sn_mr_in();
$data['DT_TMPs'] = $this->Dashboard_main_model->get_dt_tmp_in();
$data['CL_TMPs'] = $this->Dashboard_main_model->get_cl_tmp_in();
$data['_view'] = 'dashboard';
$this->load->view('layouts/main', $data);
}
JS FILE teste.js
var ctx = document.getElementById('myChart').getContext('2d');
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
}
}]
}
}
});
view
<div class="col-md-6">
<div class="box">
<div class="box-header">
<h3 class="box-title">Chamadas Atendidas</h3>
</div>
<div class="box-body no-padding">
<canvas id="myChart" style="auto;"></canvas>
</div>
</div>
</div>
</div>

Well I had a go at this and it seems the best bet is to install the Chart.min.js locally on your server - I grabbed it from Github - the link is on the chartjs.org site ( which you have obviously been to already)
Download it and save it where appropriate for your setup.
Controller - Chart.php
<?php
defined('BASEPATH') OR exit('No direct script access allowed');
class Chart extends CI_Controller {
public function __construct() {
parent::__construct();
}
public function index() {
$this->load->helper('url');
$this->load->view('chart_view');
}
}
View - chart_view.php
<canvas id="myChart"></canvas>
// Load the Chart.min.js locally on the server
// Note: make sure you have application/config/config.php config['base_url'] correctly set.
<script src="<?=base_url('assets/chart/2.8.0/Chart.min.js');?>"></script>
<script type="application/javascript">
let ctx = document.getElementById('myChart').getContext('2d');
let 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>
And I got a nice little chart showing up.
See if that works for you.

ChartJS Only Show Large Font Size for a Specific Tick

I am attempting to emphasize a specific value on the X-Axis if it meets a specific condition.
For example, in my codepen I want to only change the font size of the 'blue' bar. Is this even possible with Chart.js?
var ctx = document.getElementById("myChart").getContext('2d');
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
}
}],
xAxes: [{
ticks: {
//only show large font size for 'Blue'
fontSize: 16
}
}]
}
}
});

Chartjs doesn't have a public api to do this but you can modify internal _ticks on beforeDraw and make the label "Blue" as major: true then that label will be drawn using the major styling in tick configuration options.
Also use this with caution since it relies on internal implementation and thus might break in future releases (very unlikely to happen but just saying).
var ctx = document.getElementById("myChart").getContext('2d');
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
}
}],
xAxes: [{
ticks: {
fontSize: 16,
major: {
fontSize: 20
}
}
}]
}
},
plugins: [{
beforeDraw: function({ chart }, options) {
chart.boxes
.find(box => box.id === "x-axis-0")
._ticks
.find(tick => tick.label === "Blue")
.major = true;
}
}]
});
<canvas id="myChart"></canvas>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.7.3/Chart.min.js"></script>
PS: Just in case someone is wondering how I know this internal implementation I searched fillText in chartjs github source code and console.log(myChart) xD

Looks like it's not possible according to their docs. You can only do something like uppercase needed label with callback function
xAxes: [{
ticks: {
fontSize: 16,
callback: v => v === 'Blue' ? v.toUpperCase() : v
}
}]

For chartjs 3.0 and higher, it can be done by using scriptable-options. Include it like this into your options for ticks:
options: {
scales: {
x: {
ticks: {
font: {
size: (c) => {
if (c.index==1){
return 20 // at tick label with idx one set fontsize 20
}
else {
return 12 // for all other tick labels set fontsize 12
}
},
},
},
},
},
},

HTML 5 chartjs not working as static file

I am trying to use the chartjs to draw charts using HTML5. Does it not work if I open the HTML file by right-clicking on it and open in google chrome. I am seeing a blank screen for the following code:
<html>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.7.2/Chart.js"/>
<script>
var ctx = document.getElementById("myChart").getContext('2d');
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>
<body>
<div style="width:75%;">
<canvas id="myChart" width="400" height="400"></canvas>
</div>
</body>
</html>
Am I doing something wrong in code or do I need a server(eg. apache) to run the page?

There were basically two problems:
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.7.2/Chart.js" /> is not a valid script. It should be <script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.7.2/Chart.js"></script>
Your second script must be loaded once HTML/DOM is rendered. getContext () was not able to find canvas id.
Below is working example:
<html>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.7.2/Chart.js"></script>
<body>
<div style="width:75%;">
<canvas id="myChart" width="400" height="400"></canvas>
</div>
</body>
<script>
var ctx = document.getElementById("myChart").getContext('2d');
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>
</html>

Chart.js with TypeScript

var myCharts = <HTMLCanvasElement>document.getElementById("myChart");
var ctx = myCharts.getContext('2d');
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
}
}]
}
}
});
// Please someone help me with this function. I am currently learning and not understanding whats wrong with this. The error says I am missing a semi colon at =>

Your problem is on this line:
var myChart = new Chart(ctx) => ({
This isn't valid JavaScript. My best guess is you meant something like this:
var myChart = new Chart(ctx, {

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