Having issues while converting one piece code of code to jsx

Question

I am new to react. So please pardon my naiveness. I have the following piece of react code:

import { Line } from '@antv/g2plot';

const data = [
  { year: '1991', value: 3 },
  { year: '1992', value: 4 },
  { year: '1993', value: 3.5 },
  { year: '1994', value: 5 },
  { year: '1995', value: 4.9 },
  { year: '1996', value: 6 },
  { year: '1997', value: 7 },
  { year: '1998', value: 9 },
  { year: '1999', value: 13 },
];

const linePlot = new Line(document.getElementById('container'), {
  title: {
    visible: true,
    text: 'DEF',
  },
  description: {
    visible: true,
    text: 'ABC',
  },
  padding: 'auto',
  forceFit: true,
  data,
  xField: 'year',
  yField: 'value',
  smooth: true,
});

linePlot.render();

I need to convert the above piece of code inside a class and export it: I wrote the below code

import React, { useEffect } from "react";
import { Line } from "
@antv
/g2plot";
export const YourComponentName = function() {
const [linePlot, setlinePlot] = useState(initialState);
const data = [
{ year: "1991", value: 3 },
{ year: "1992", value: 4 },
{ year: "1993", value: 3.5 },
{ year: "1994", value: 5 },
{ year: "1995", value: 4.9 },
{ year: "1996", value: 6 },
{ year: "1997", value: 7 },
{ year: "1998", value: 9 },
{ year: "1999", value: 13 }
];
useEffect(() => {
setlinePlot(
new Line(document.getElementById("container"), {
title: {
visible: true,
text: "DEF"
},
description: {
visible: true,
text: "ABC"
},
padding: "auto",
forceFit: true,
data,
xField: "year",
yField: "value",
smooth: true
})
);
return () => {
// you can clanup here
};
}, [linePlot]);
return; //jsx from here with state which you want to render.
};

However since, this is a container class, I don't want "document..getElementById("container")" in my this component class. My index.js already has

ReactDOM.render(<Main />, document.getElementById("container"));

Please help me.

Answer 1

In React you can either have a functional component or a class based component. You have used the react useState and useEffect hooks, which are for functional components only and cannot be used in the class-based approach.

Just a side note. This talks about the reasons why you should not update state inside the useEffect hook.

Do you want the Line to be created once, when the component loads?

Another note. The 'below code' you mentioned does not use class's.

*Edit
Here is a basic react implementation, however, due to you using antv/g2plot.Line I can't get it to update the graph without overlaying it on top of the old one. From a quick look at the docs, I would recommend changing it to a Chart.

Answer 2

I got the answer from other react community platform. Am pasting it here, if someone faces a similar issue:

import ReactDOM from "react-dom";
import React from "react";

import { Line } from "@antv/g2plot";
import ReactG2Plot from "react-g2plot";


class SampleReact extends React.Component {
  render() {
    const data = [
        { year: "1991", value: 3 },
        { year: "1992", value: 4 },
        { year: "1993", value: 3.5 },
        { year: "1994", value: 5 },
        { year: "1995", value: 4.9 },
        { year: "1996", value: 6 },
        { year: "1997", value: 7 },
        { year: "1998", value: 9 },
        { year: "1999", value: 13 }
      ];
      const config = {
        title: {
          visible: true,
          text: "曲线折线图"
        },
        description: {
          visible: true,
          text: "用平滑的曲线代替折线。"
        },
        padding: "auto",
        forceFit: true,
        data,
        xField: "year",
        yField: "value",
        smooth: true
      };
    return (
        <ReactG2Plot Ctor={Line} config={config} />

    );
  }
}
export default SampleReact;