Nuxt/packages/vue-app/template/mixins/fetch.client.js

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import Vue from 'vue'
import { hasFetch, normalizeError, addLifecycleHook } from '../utils'
const isSsrHydration = (vm) => vm.$vnode && vm.$vnode.elm && vm.$vnode.elm.dataset && vm.$vnode.elm.dataset.ssrKey
const nuxtState = window.<%= globals.context %>
export default {
beforeCreate () {
if (!hasFetch(this)) {
return
}
this._fetchDelay = typeof this.$options.fetchDelay === 'number' ? this.$options.fetchDelay : 200
Vue.util.defineReactive(this, '$fetchState', {
pending: false,
error: null,
timestamp: Date.now()
})
this.$fetch = $fetch.bind(this)
addLifecycleHook(this, 'created', created)
addLifecycleHook(this, 'beforeMount', beforeMount)
}
}
function beforeMount() {
if (!this._hydrated) {
return this.$fetch()
}
}
function created() {
if (!isSsrHydration(this)) {
return
}
// Hydrate component
this._hydrated = true
this._ssrKey = +this.$vnode.elm.dataset.ssrKey
const data = nuxtState.fetch[this._ssrKey]
// If fetch error
if (data && data._error) {
this.$fetchState.error = data._error
return
}
// Merge data
for (const key in data) {
Vue.set(this.$data, key, data[key])
}
}
async function $fetch() {
this.$nuxt.nbFetching++
this.$fetchState.pending = true
this.$fetchState.error = null
this._hydrated = false
let error = null
const startTime = Date.now()
try {
await this.$options.fetch.call(this)
} catch (err) {
error = normalizeError(err)
}
const delayLeft = this._fetchDelay - (Date.now() - startTime)
if (delayLeft > 0) {
await new Promise(resolve => setTimeout(resolve, delayLeft))
}
this.$fetchState.error = error
this.$fetchState.pending = false
this.$fetchState.timestamp = Date.now()
this.$nextTick(() => this.$nuxt.nbFetching--)
}