/
Link.js
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Link.js
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import React from "react";
import { __RouterContext as RouterContext } from "react-router";
import PropTypes from "prop-types";
import invariant from "tiny-invariant";
import { resolveToLocation, normalizeToLocation } from "./utils/locationUtils";
// React 15 compat
let { forwardRef } = React;
if (typeof forwardRef === "undefined") {
forwardRef = C => C;
}
function isModifiedEvent(event) {
return !!(event.metaKey || event.altKey || event.ctrlKey || event.shiftKey);
}
const LinkAnchor = forwardRef(
({ innerRef, navigate, onClick, ...rest }, forwardedRef) => {
const { target } = rest;
return (
<a
{...rest}
ref={forwardedRef || innerRef}
onClick={event => {
try {
if (onClick) onClick(event);
} catch (ex) {
event.preventDefault();
throw ex;
}
if (
!event.defaultPrevented && // onClick prevented default
event.button === 0 && // ignore everything but left clicks
(!target || target === "_self") && // let browser handle "target=_blank" etc.
!isModifiedEvent(event) // ignore clicks with modifier keys
) {
event.preventDefault();
navigate();
}
}}
/>
);
}
);
if (__DEV__) {
LinkAnchor.displayName = "LinkAnchor";
}
/**
* The public API for rendering a history-aware <a>.
*/
const Link = forwardRef(
(
{ component = LinkAnchor, replace, to, innerRef, ...rest },
forwardedRef
) => {
return (
<RouterContext.Consumer>
{context => {
invariant(context, "You should not use <Link> outside a <Router>");
const { history } = context;
const location = normalizeToLocation(
resolveToLocation(to, context.location),
context.location
);
const href = location ? history.createHref(location) : "";
return React.createElement(component, {
...rest,
ref: forwardedRef || innerRef,
href,
navigate() {
const location = resolveToLocation(to, context.location);
const method = replace ? history.replace : history.push;
method(location);
}
});
}}
</RouterContext.Consumer>
);
}
);
if (__DEV__) {
const toType = PropTypes.oneOfType([
PropTypes.string,
PropTypes.object,
PropTypes.func
]);
const refType = PropTypes.oneOfType([
PropTypes.string,
PropTypes.func,
PropTypes.shape({ current: PropTypes.any })
]);
Link.displayName = "Link";
Link.propTypes = {
innerRef: refType,
onClick: PropTypes.func,
replace: PropTypes.bool,
target: PropTypes.string,
to: toType.isRequired
};
}
export default Link;