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LimitedWordTextarea react Code Snippet in 2024

componentsinputstatecallbackeffecteventintermediate

Last Updated: 7 April 2024

Renders a textarea component with a word limit.

  • Use the useState() hook to create a state variable, containing content and wordCount. Use the value prop and 0 as the initial values respectively.
  • Use the useCallback() hooks to create a memoized function, setFormattedContent, that uses String.prototype.split() to turn the input into an array of words.
  • Check if the result of applying Array.prototype.filter() combined with Boolean has a length longer than limit. If it does, trim the input. Otherwise return the raw input, updating state accordingly in both cases.
  • Use the useEffect() hook to call the setFormattedContent method on the value of the content state variable during the initial render.
  • Bind the onChange event of the <textarea> to call setFormattedContent with the value of event.target.value.
const LimitedWordTextarea = ({ rows, cols, value, limit }) => { const [{ content, wordCount }, setContent] = React.useState({ content: value, wordCount: 0 }); const setFormattedContent = React.useCallback( text => { let words = text.split(' ').filter(Boolean); if (words.length > limit) { setContent({ content: words.slice(0, limit).join(' '), wordCount: limit }); } else { setContent({ content: text, wordCount: words.length }); } }, [limit, setContent] ); React.useEffect(() => { setFormattedContent(content); }, []); return ( <> <textarea rows={rows} cols={cols} onChange={event => setFormattedContent(event.target.value)} value={content} /> <p> {wordCount}/{limit} </p> </> ); };
ReactDOM.render( <LimitedWordTextarea limit={5} value="Hello there!" />, document.getElementById('root') );

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