[Bug]: A undifined canvas error occuring in react-native

[FelipeModena]

Would you like to work on a fix?

• [X] Check this if you would like to implement a PR, we are more than happy to help you go through the process.

Current and expected behavior

I am facing this error, and i couldnt find a any way to solve it. Anyone have ever faced it? I see that in the frequent questions, there is "how to access canvas component", but still not useful.

I am using the simple code exaple that they give as exemple here

`import React from "react"; import { Chart as ChartJS, CategoryScale, LinearScale, PointElement, LineElement, Title, Tooltip, Legend, } from "chart.js"; import { Line } from "react-chartjs-2"; import { Faker, de, de_CH, en_US } from "@faker-js/faker";

export const faker = new Faker({ locale: [de_CH, de], }); ChartJS.register( CategoryScale, LinearScale, PointElement, LineElement, Title, Tooltip, Legend );

export const options = { responsive: true, plugins: { legend: { position: "top" as const, }, title: { display: true, text: "Chart.js Line Chart", }, }, };

const labels = ["January", "February", "March", "April", "May", "June", "July"];

export const data = { labels, datasets: [ { label: "Dataset 1", data: labels.map(() => faker.datatype.number({ min: -1000, max: 1000 })), borderColor: "rgb(255, 99, 132)", backgroundColor: "rgba(255, 99, 132, 0.5)", }, { label: "Dataset 2", data: labels.map(() => faker.datatype.number({ min: -1000, max: 1000 })), borderColor: "rgb(53, 162, 235)", backgroundColor: "rgba(53, 162, 235, 0.5)", }, ], };

export function ContractChart2() { return <Line options={options} data={data} />; }`

Reproduction

https://react-chartjs-2.js.org/examples/line-chart

chart.js version

^4.4.0

react-chartjs-2 version

5.2.0

Possible solution

No response

[jiayeli-hualien]

I got the same issue when I use in my React Native project created by expo.

package versions "chart.js": "^4.4.1", "expo": "~49.0.15", "expo-status-bar": "~1.6.0", "react": "18.2.0", "react-chartjs-2": "^5.2.0", "react-native": "0.72.6"

error Invariant Violation: View config getter callback for component canvas must be a function (received undefined). Make sure to start component names with a capital letter.

This error is located at: in canvas in ChartComponent in Unknown (created by App) in App (created by withDevTools(App)) in withDevTools(App) in RCTView (created by View) in View (created by AppContainer) in RCTView (created by View) in View (created by AppContainer) in AppContainer in main(RootComponent), js engine: hermes

[awd0786]

What is the solution for this??

my code is

import React, { useEffect, useState } from 'react'; import axios from 'axios'; import { Line } from 'react-chartjs-2'; import CustomText from './CustomText'; import { API_URL } from '@env';

const Graph: React.FC = () => { const [graphData, setGraphData] = useState<{ xData: number[], yData: number[] }>({ xData: [], yData: [] });

useEffect(() => { fetchData(); }, []);

const fetchData = async () => { try { const xResponse = await axios.get<number[]>(${API_URL}/api/Donor/GetXAxis); const yResponse = await axios.get<number[]>(${API_URL}/api/Donor/GetYAxis);

  setGraphData({ xData: xResponse.data, yData: yResponse.data });
} catch (error) {
  console.error('Error fetching data:', error);
}

};

const chartData = { labels: graphData.xData.map((_, index) => ${index}), datasets: [ { label: 'Graph Data', data: graphData.yData, fill: false, borderColor: 'rgb(75, 192, 192)', tension: 0.1, }, ], };

return ( <div style={{ maxWidth: '600px', margin: '0 auto' }}> <CustomText>Graph</CustomText> <Line data={chartData} /> ); };

export default Graph;

still i am getting error Render Error ERROR Invariant Violation: View config getter callback for component canvas must be a function (received undefined). Make sure to start component names with a capital letter.