I wrote a React component which renders rating and visualizes it with stars. But I had to use dangerouslySetInnerHTML for that. How could I rewrite component with better code style and without dangerouslySetInnerHTML? Thank you for any help.
export default class BookRating extends React.Component {
renderStars = () => {
let result = '';
for(let i=1; i<=5; i++) {
this.props.rating >= i
? result += '<div class="fa fa-star checked"></div>'
: result += '<div class="fa fa-star"></div>'
}
return result;
}
render () {
return (
<div className="rating" dangerouslySetInnerHTML={{ __html: this.renderStars() }} />
);
}
}
You can render multiple elements with an array, rather than a string:
export default class BookRating extends React.Component {
renderStars = () => {
let result = [];
for(let i=1; i<=5; i++) {
this.props.rating >= i
? result.push(<div key={i} class="fa fa-star checked"></div>)
: result.push(<div key={i} class="fa fa-star"></div>'
}
return result;
}
render () {
return (
<div className="rating">{this.renderStars()}</div>
);
}
}
As Quentin and Emile pointed out, you can write this function in one line, like so:
renderStars = () => Array(5).fill(0).map(_, i => <div className={`fa fa-star${this.props.rating > i ? ' checked' : ''}`}/>)
I did something similar that also supported half-stars and showed “empty” stars for the remaining spots (eg 3.5 stars would show 3 full stars, 1 half star, and 1 empty star):
const Rating = ({ rating }) => {
rating = Math.round(rating * 2) / 2
const fullStars = Math.floor(rating)
const halfStars = rating - fullStars > 0.2 ? 1 : 0
const emptyStars = 5 - fullStars - halfStars
return (
<div css={{ whiteSpace: "nowrap", ".fa": { color: "yellow" } }}>
{[...Array(fullStars)].map((_, index) => (
<span key={`f-${index}`} className="fa fa-star" />
))}
{[...Array(halfStars)].map((_, index) => (
<span key={`h-${index}`} className="fa fa-star-half-o" />
))}
{[...Array(emptyStars)].map((_, index) => (
<span key={`o-${index}`} className="fa fa-star-o" />
))}
</div>
)
}
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