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StarRating react Code Snippet in 2024

componentschildreninputstateintermediate

Last Updated: 1 October 2024

Renders a star rating component.

  • Define a Star component. It renders each individual star with the appropriate appearance, based on the parent component's state.
  • Define a StarRating component. Use the useState() hook to define the rating and selection state variables with the appropriate initial values.
  • Create a method, hoverOver, that updates selected according to the provided event, using the .data-star-id attribute of the event's target or resets it to 0 if called with a null argument.
  • Use Array.from() to create an array of 5 elements and Array.prototype.map() to create individual <Star> components.
  • Handle the onMouseOver and onMouseLeave events of the wrapping element using hoverOver. Handle the onClick event using setRating.
.star { color: #ff9933; cursor: pointer; }
const Star = ({ marked, starId }) => { return ( <span data-star-id={starId} className="star" role="button"> {marked ? '\u2605' : '\u2606'} </span> ); }; const StarRating = ({ value }) => { const [rating, setRating] = React.useState(parseInt(value) || 0); const [selection, setSelection] = React.useState(0); const hoverOver = event => { let val = 0; if (event && event.target && event.target.getAttribute('data-star-id')) val = event.target.getAttribute('data-star-id'); setSelection(val); }; return ( <div onMouseOut={() => hoverOver(null)} onClick={e => setRating(e.target.getAttribute('data-star-id') || rating)} onMouseOver={hoverOver} > {Array.from({ length: 5 }, (v, i) => ( <Star starId={i + 1} key={`star_${i + 1}`} marked={selection ? selection >= i + 1 : rating >= i + 1} /> ))} </div> ); };
ReactDOM.render(<StarRating value={2} />, document.getElementById('root'));

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