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Link.js
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Link.js
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import React from "react";
import { __RouterContext as RouterContext } from "react-router";
import { createLocation } from "history";
import PropTypes from "prop-types";
import invariant from "tiny-invariant";
function isModifiedEvent(event) {
return !!(event.metaKey || event.altKey || event.ctrlKey || event.shiftKey);
}
/**
* The public API for rendering a history-aware <a>.
*/
class Link extends React.Component {
handleClick(event, history) {
if (this.props.onClick) this.props.onClick(event);
if (
!event.defaultPrevented && // onClick prevented default
event.button === 0 && // ignore everything but left clicks
(!this.props.target || this.props.target === "_self") && // let browser handle "target=_blank" etc.
!isModifiedEvent(event) // ignore clicks with modifier keys
) {
event.preventDefault();
const method = this.props.replace ? history.replace : history.push;
method(this.props.to);
}
}
render() {
const { innerRef, replace, to, ...rest } = this.props; // eslint-disable-line no-unused-vars
return (
<RouterContext.Consumer>
{context => {
invariant(context, "You should not use <Link> outside a <Router>");
const location =
typeof to === "string"
? createLocation(to, null, null, context.location)
: to;
const href = location ? context.history.createHref(location) : "";
return (
<a
{...rest}
onClick={event => this.handleClick(event, context.history)}
href={href}
ref={innerRef}
/>
);
}}
</RouterContext.Consumer>
);
}
}
if (__DEV__) {
const toType = PropTypes.oneOfType([PropTypes.string, PropTypes.object]);
const innerRefType = PropTypes.oneOfType([
PropTypes.string,
PropTypes.func,
PropTypes.shape({ current: PropTypes.instanceOf(Element) })
]);
Link.propTypes = {
innerRef: innerRefType,
onClick: PropTypes.func,
replace: PropTypes.bool,
target: PropTypes.string,
to: toType.isRequired
};
}
export default Link;