link.js
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/* @flow */
import { createRoute, isSameRoute, isIncludedRoute } from '../util/route'
import { _Vue } from '../install'
// work around weird flow bug
const toTypes: Array<Function> = [String, Object]
const eventTypes: Array<Function> = [String, Array]
export default {
name: 'router-link',
props: {
to: {
type: toTypes,
required: true
},
tag: {
type: String,
default: 'a'
},
exact: Boolean,
append: Boolean,
replace: Boolean,
activeClass: String,
event: {
type: eventTypes,
default: 'click'
}
},
render (h: Function) {
const router = this.$router
const current = this.$route
const { location, route, href } = router.resolve(this.to, current, this.append)
const classes = {}
const activeClass = this.activeClass || router.options.linkActiveClass || 'router-link-active'
const compareTarget = location.path ? createRoute(null, location) : route
classes[activeClass] = this.exact
? isSameRoute(current, compareTarget)
: isIncludedRoute(current, compareTarget)
const handler = e => {
if (guardEvent(e)) {
if (this.replace) {
router.replace(location)
} else {
router.push(location)
}
}
}
const on = { click: guardEvent }
if (Array.isArray(this.event)) {
this.event.forEach(e => { on[e] = handler })
} else {
on[this.event] = handler
}
const data: any = {
class: classes
}
if (this.tag === 'a') {
data.on = on
data.attrs = { href }
} else {
// find the first <a> child and apply listener and href
const a = findAnchor(this.$slots.default)
if (a) {
// in case the <a> is a static node
a.isStatic = false
const extend = _Vue.util.extend
const aData = a.data = extend({}, a.data)
aData.on = on
const aAttrs = a.data.attrs = extend({}, a.data.attrs)
aAttrs.href = href
} else {
// doesn't have <a> child, apply listener to self
data.on = on
}
}
return h(this.tag, data, this.$slots.default)
}
}
function guardEvent (e) {
// don't redirect with control keys
if (e.metaKey || e.ctrlKey || e.shiftKey) return
// don't redirect when preventDefault called
if (e.defaultPrevented) return
// don't redirect on right click
if (e.button !== undefined && e.button !== 0) return
// don't redirect if `target="_blank"`
if (e.target && e.target.getAttribute) {
const target = e.target.getAttribute('target')
if (/\b_blank\b/i.test(target)) return
}
// this may be a Weex event which doesn't have this method
if (e.preventDefault) {
e.preventDefault()
}
return true
}
function findAnchor (children) {
if (children) {
let child
for (let i = 0; i < children.length; i++) {
child = children[i]
if (child.tag === 'a') {
return child
}
if (child.children && (child = findAnchor(child.children))) {
return child
}
}
}
}