how to get React chartjs to resize back down with window

Question

I have this code, which, for some reason, will grow when I resize a window, but not shrink. I was wondering how to remedy this.

https://codesandbox.io/s/react-chartjs-2-example-1nur4

import React from "react";
import { render } from "react-dom";
import LineDemo from "./LineDemo";

const styles = {
  fontFamily: "sans-serif",
  textAlign: "center"
};

const App = () => (
  <div style={styles}>
    <table style={{ width: "100vw", borderCollapse: "collapse" }}>
      <tbody>
        {Array.from({ length: 4 }, el => "foo")
          .concat(<LineDemo />)
          .map(el => (
            <td style={{ border: "solid" }}>{el}</td>
          ))}
      </tbody>
    </table>
  </div>
);

render(<App />, document.getElementById("root"));

Caddis

Answer 1

Have a detailed look at https://www.chartjs.org/docs/latest/configuration/responsive.html. The Important Note section mentions how responsiveness can be achieved. It states that

Chart.js uses its parent container to update the canvas render and display sizes. However, this method requires the container to be relatively positioned and dedicated to the chart canvas only. Responsiveness can then be achieved by setting relative values for the container size.

In your case, the parent container for the line chart is the <div> element. The render function of LineDemo component in LineDemo.js file then can be modified to look like:

render() {
  return (
    <div style={{ position: "relative", margin: "auto", width: "80vw" }}>
      <h2>Line Example</h2>
      <Line ref="chart" data={data} />
    </div>
  );
}

Here is a working example: https://codesandbox.io/s/react-chartjs-2-example-hzygw

Crayton

For future devs, that documentation page moved here: chartjs.org/docs/latest/configuration/responsive.html – Outrigger

Thank you, @myahl! I have updated the answer with the new page links. – Crayton

Answer 2

What worked for me was to add chart container a width style:

<div style={{width: '99%'}}>
    <Bar options={options} data={data} />
</div>

However if I set width 100% it won't work lol

Scudder

Very weird, but solved it for me too. – Roguish

life saver, spent 2 hours on this. – Embrey

i created an account just to let you know this answer resolved about 3 hours of trial. nothing else seemed to work. thank you. ive been googling nonstop, asked chat gpt. nothing did it. but this did – Moonlight

Answer 3

another solution that works, for anyone reading in 2023 is this:

canvas {
  width: 100% !important;
}

Moonlight