Use Class Component in React Material UI Mar 3rd 2020 Words: 328

Material UI is a fascinating library for react, but all its default examples are written use function component rather than class component.

Convert a component from function to class is quite easy.

Take the following Card as example.

The original code:

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import React from 'react';
import { makeStyles } from '@material-ui/core/styles';
import Card from '@material-ui/core/Card';
import CardContent from '@material-ui/core/CardContent';
import Typography from '@material-ui/core/Typography';

const useStyles = makeStyles({
  root: {
    minWidth: 275,
  }
  title: {
    fontSize: 14,
  }
});

export default function SimpleCard() {
  const classes = useStyles();

  return (
    <Card className={classes.root}>
      <CardContent>
        <Typography className={classes.title} color="textSecondary" gutterBottom>
          Word of the Day
        </Typography>
      </CardContent>
    </Card>
  );
}

Converted:

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import React from 'react';
import PropTypes from 'prop-types';
import { withStyle } from '@material-ui/core/styles';   // use withStyle instead of makeStyle
import Card from '@material-ui/core/Card';
import CardContent from '@material-ui/core/CardContent';
import Typography from '@material-ui/core/Typography';

// no more makeStyle
const styles = theme => ({
    root: {
        minWidth: 275,
        margin: theme.spacing(1)    // Use theme
    }
    title: {
        fontSize: 14,
        margin: props => (props.titleMargin)    // This is how you use props in style
    }
});

class MyCard extends React.Component {
    // define props type
    static propTypes = {
        titleMargin: PropTypes.string
    };

    // define default props
    static defaultProps = {
        titleMargin: '10px'
    };

    render() {
        const {classes} = this.props;   // for class name referring
        return (
            <Card className={classes.root}>
            <CardContent>
                <Typography className={classes.title} color="textSecondary" gutterBottom>
                Word of the Day
                </Typography>
            </CardContent>
            </Card>
  );
    }
}

export default withStyle(styles)(MyCard);   // Wrap use withStyle

EOF