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next.js/packages/next/lib/link.js

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/* global __NEXT_DATA__ */
import { resolve, format, parse } from 'url'
import React, { Component, Children } from 'react'
import PropTypes from 'prop-types'
import Router, { _rewriteUrlForNextExport } from './router'
import { execOnce, getLocationOrigin } from './utils'
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function isLocal (href) {
const url = parse(href, false, true)
const origin = parse(getLocationOrigin(), false, true)
return !url.host ||
(url.protocol === origin.protocol && url.host === origin.host)
}
function memoizedFormatUrl (formatUrl) {
let lastHref = null
let lastAs = null
let lastResult = null
return (href, as) => {
if (href === lastHref && as === lastAs) {
return lastResult
}
const result = formatUrl(href, as)
lastHref = href
lastAs = as
lastResult = result
return result
}
}
class Link extends Component {
componentDidMount () {
this.prefetch()
}
componentDidUpdate (prevProps) {
if (JSON.stringify(this.props.href) !== JSON.stringify(prevProps.href)) {
this.prefetch()
}
}
// The function is memoized so that no extra lifecycles are needed
// as per https://reactjs.org/blog/2018/06/07/you-probably-dont-need-derived-state.html
formatUrls = memoizedFormatUrl((href, asHref) => {
return {
href: href && typeof href === 'object'
? format(href)
: href,
as: asHref && typeof asHref === 'object'
? format(asHref)
: asHref
}
})
linkClicked = e => {
const { nodeName, target } = e.currentTarget
if (nodeName === 'A' &&
((target && target !== '_self') || e.metaKey || e.ctrlKey || e.shiftKey || (e.nativeEvent && e.nativeEvent.which === 2))) {
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// ignore click for new tab / new window behavior
return
}
let { href, as } = this.formatUrls(this.props.href, this.props.as)
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if (!isLocal(href)) {
// ignore click if it's outside our scope
return
}
const { pathname } = window.location
href = resolve(pathname, href)
as = as ? resolve(pathname, as) : href
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e.preventDefault()
// avoid scroll for urls with anchor refs
let { scroll } = this.props
if (scroll == null) {
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scroll = as.indexOf('#') < 0
}
// replace state instead of push if prop is present
const { replace } = this.props
const changeMethod = replace ? 'replace' : 'push'
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// straight up redirect
Router[changeMethod](href, as, { shallow: this.props.shallow })
.then((success) => {
if (!success) return
if (scroll) {
window.scrollTo(0, 0)
document.body.focus()
}
})
.catch((err) => {
if (this.props.onError) this.props.onError(err)
})
};
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prefetch () {
if (!this.props.prefetch) return
if (typeof window === 'undefined') return
// Prefetch the JSON page if asked (only in the client)
const { pathname } = window.location
const {href: parsedHref} = this.formatUrls(this.props.href, this.props.as)
const href = resolve(pathname, parsedHref)
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Router.prefetch(href)
}
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render () {
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let { children } = this.props
let { href, as } = this.formatUrls(this.props.href, this.props.as)
// Deprecated. Warning shown by propType check. If the childen provided is a string (<Link>example</Link>) we wrap it in an <a> tag
if (typeof children === 'string') {
children = <a>{children}</a>
}
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// This will return the first child, if multiple are provided it will throw an error
const child = Children.only(children)
const props = {
onClick: (e) => {
if (child.props && typeof child.props.onClick === 'function') {
child.props.onClick(e)
}
if (!e.defaultPrevented) {
this.linkClicked(e)
}
}
}
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// If child is an <a> tag and doesn't have a href attribute, or if the 'passHref' property is
// defined, we specify the current 'href', so that repetition is not needed by the user
if (this.props.passHref || (child.type === 'a' && !('href' in child.props))) {
props.href = as || href
}
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// Add the ending slash to the paths. So, we can serve the
// "<page>/index.html" directly.
if (
props.href &&
typeof __NEXT_DATA__ !== 'undefined' &&
__NEXT_DATA__.nextExport
) {
props.href = _rewriteUrlForNextExport(props.href)
}
return React.cloneElement(child, props)
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}
}
if (process.env.NODE_ENV === 'development') {
const warn = execOnce(console.error)
// This module gets removed by webpack.IgnorePlugin
const exact = require('prop-types-exact')
Link.propTypes = exact({
href: PropTypes.oneOfType([PropTypes.string, PropTypes.object]).isRequired,
as: PropTypes.oneOfType([PropTypes.string, PropTypes.object]),
prefetch: PropTypes.bool,
replace: PropTypes.bool,
shallow: PropTypes.bool,
passHref: PropTypes.bool,
scroll: PropTypes.bool,
children: PropTypes.oneOfType([
PropTypes.element,
(props, propName) => {
const value = props[propName]
if (typeof value === 'string') {
warn(`Warning: You're using a string directly inside <Link>. This usage has been deprecated. Please add an <a> tag as child of <Link>`)
}
return null
}
]).isRequired
})
}
export default Link