Problem for display a chart with Chart.js and Angular

user_11889030 0
Viewed 7487

I want to display a chart using chart.js in angular. In first time I try to implement a example took on the net and I have no problem during the compilation. This is the code in my .ts :

import { Component, OnInit } from '@angular/core';
import { Chart } from "chart.js";

@Component({ 
   ...
})

export class MyChartComponent implements OnInit {
    constructor(){
    }

    ngOnInit(): void {
      new Chart("myChart", {
      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: {
          y: {
            beginAtZero: true
          }
        }
      }
    });
    }
}

And in my .html I have :

<div id="divChart">
  <canvas id="myChart"></canvas>
</div>

But when i start the serve, I have this error :

ERROR Error: "linear" is not a registered scale.
    _get chart.esm.js:4622
    getScale chart.esm.js:4576
    buildOrUpdateScales chart.esm.js:5224
    each helpers.segment.js:102
    buildOrUpdateScales chart.esm.js:5211
    update chart.esm.js:5336
    Chart chart.esm.js:5096
    ngOnInit my-chart.component.ts:32
    Angular 37
    zUnb main.ts:11
    Webpack 6

ERROR TypeError: area is undefined
    _isPointInArea helpers.segment.js:1266
    getNearestItems chart.esm.js:2465
    nearest chart.esm.js:2548
    getElementsAtEventForMode chart.esm.js:5503
    _handleEvent chart.esm.js:5737
    _eventHandler chart.esm.js:5720
    listener chart.esm.js:5617
    proxy chart.esm.js:3022
    throttled helpers.segment.js:28
    Angular 17
    throttled helpers.segment.js:26
    Angular 14
    addListener chart.esm.js:2905
    createProxyAndListen chart.esm.js:3028
    addEventListener chart.esm.js:3071
    _add chart.esm.js:5605
    bindEvents chart.esm.js:5619
    each helpers.segment.js:102
    bindEvents chart.esm.js:5619
    _initialize chart.esm.js:5129
    Chart chart.esm.js:5094
    ngOnInit my-chart.component.ts:32
    Angular 13

and many other errors. Can you help me please ?

chart.js angular
4 Answers

import { Chart, registerables} from 'chart.js';

Chart.register(...registerables);

user_52356370

Chart.js 3 is tree-shakeable, so it is necessary to import and register the controllers, elements, scales and plugins you are going to use.

Please take a look at Bundlers (Webpack, Rollup, etc.) from the Chart.js documentation.

In your case, this could be done as follows ():

import { Chart, BarElement, BarController, CategoryScale, Decimation, Filler, Legend, Title, Tooltip} from 'chart.js';

export class MyChartComponent implements OnInit {
  
    constructor() {
        Chart.register(BarElement, BarController, CategoryScale, Decimation, Filler, Legend, Title, Tooltip);
    }
    ...
}
user_23584090

I have the same problem, I fixed it this way. Use this:

import Chart from 'chart.js/auto';

Instead of this:

import { Chart } from 'node_modules/chart.js';
user_174571180

To register it lazily use the constructor

    constructor(){
       Chart.register(...registerables);
    }
user_156602690
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