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LimitedTextarea react Code Snippet in 2023

componentsstatecallbackeventbeginner

Last Updated: 4 February 2023

Renders a textarea component with a character limit.

  • Use the useState() hook to create the content state variable. Set its value to that of value prop, trimmed down to limit characters.
  • Create a method setFormattedContent, which trims the content down to limit characters and memoize it, using the useCallback() hook.
  • Bind the onChange event of the <textarea> to call setFormattedContent with the value of the fired event.
const LimitedTextarea = ({ rows, cols, value, limit }) => { const [content, setContent] = React.useState(value.slice(0, limit)); const setFormattedContent = React.useCallback( text => { setContent(text.slice(0, limit)); }, [limit, setContent] ); return ( <> <textarea rows={rows} cols={cols} onChange={event => setFormattedContent(event.target.value)} value={content} /> <p> {content.length}/{limit} </p> </> ); };
ReactDOM.render( <LimitedTextarea limit={32} value="Hello!" />, document.getElementById('root') );

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