Unable to assign a className to a personalized React component - troubleshooting needed!

I have a component that relies on another component. I am trying to pass CSS positioning from the outer component to the inner one by using the following code:

import OptionsMenu from './OptionsMenu'
import { withStyles } from 'material-ui/styles';

const styles = theme => ({
  optionsPosition: {
    position: 'absolute',
    right: 0,
    top: 0
  }
});


class Modal extends React.Component {
  render() {
    const { classes } = this.props;

    return (
      <Card>
        ...
        <OptionsMenu className={classes.optionsPosition}/>
      </Card>
    )
  }
}

export default withStyles(styles)(Modal);

What's interesting is that when I wrap OptionsMenu in a div, the styling works as expected.

<Card>
  ...
  <div className={classes.optionsPosition}>
    <OptionsMenu />
  </div>
</Card>

However, I would like to avoid adding an unnecessary div. Can anyone explain why OptionsMenu seems to ignore the provided styling?

Answer №1

When you type

<OptionsMenu className={classes.optionsPosition}/>
, you are essentially passing a prop called className with the value of classes.optionsPosition to the OptionsMenu component.

Within the OptionsMenu component, you can utilize this prop by applying it as a className to an HTML DOM element (such as a div or span).

Alternatively, within the Card component, you have the option to enclose children (such as OptionsMenu) in a div that includes the relevant className.

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