Renders a string as plaintext, with URLs converted to appropriate <a>
elements.
- Use
String.prototype.split()
andString.prototype.match()
with a regular expression to find URLs in a string. - Return a
<React.Fragment>
with matched URLs rendered as<a>
elements, dealing with missing protocol prefixes if necessary, and the rest of the string rendered as plaintext.
代码实现
function AutoLink({ text }) {
const delimiter = /((?:https?:\/\/)?(?:(?:[a-z0-9]?(?:[a-z0-9\-]{1,61}[a-z0-9])?\.[^\.|\s])+[a-z\.]*[a-z]+|(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)(?:\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3})(?::\d{1,5})*[a-z0-9.,_\/~#&=;%+?\-\\(\\)]*)/gi;
return (
<React.Fragment>
{text.split(delimiter).map(word => {
let match = word.match(delimiter);
if (match) {
let url = match[0];
return <a href={url.startsWith('http') ? url : `http://${url}`}>{url}</a>;
}
return word;
})}
</React.Fragment>
);
}
使用样例
ReactDOM.render(
<AutoLink text="foo bar baz http://example.org bar" />,
document.getElementById('root')
);