105 lines
2.6 KiB
JavaScript
105 lines
2.6 KiB
JavaScript
/* global window, document */
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const webpackModule = module
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export default class PageLoader {
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constructor (buildId) {
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this.buildId = buildId
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this.pageCache = {}
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this.pageLoadedHandlers = {}
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this.loadingRoutes = {}
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}
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normalizeRoute (route) {
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if (route[0] !== '/') {
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throw new Error('Route name should start with a "/"')
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}
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if (route === '/') return route
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return route.replace(/(\/)?(index)?$/, '')
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}
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loadPage (route) {
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route = this.normalizeRoute(route)
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const cachedPage = this.pageCache[route]
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if (cachedPage) {
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return new Promise((resolve, reject) => {
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if (cachedPage.error) return reject(cachedPage.error)
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return resolve(cachedPage.page)
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})
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}
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if (this.loadingRoutes[route]) {
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return this.loadingRoutes[route]
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}
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const loadingPromise = new Promise((resolve, reject) => {
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this.loadScript(route, (error) => {
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delete this.loadingRoutes[route]
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if (error) return reject(error)
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const cachedPage = this.pageCache[route]
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if (cachedPage.error) return reject(cachedPage.error)
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return resolve(cachedPage.page)
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})
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})
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this.loadingRoutes[route] = loadingPromise
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return loadingPromise
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}
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loadScript (route, fn) {
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route = this.normalizeRoute(route)
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const script = document.createElement('script')
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const url = `/_next/${encodeURIComponent(this.buildId)}/page${route}`
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script.src = url
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script.type = 'text/javascript'
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script.onerror = (e) => {
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const error = new Error(`Network error occurred when loading route: ${route}`)
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fn(error)
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}
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script.onload = () => {
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fn()
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}
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document.body.appendChild(script)
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}
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// This method if called by the route code.
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registerPage (route, regFn) {
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const register = () => {
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regFn((error, page) => {
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route = this.normalizeRoute(route)
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// add the page to the cache
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this.pageCache[route] = { error, page }
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})
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}
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// Wait for webpack to became idle if it's not.
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// More info: https://github.com/zeit/next.js/pull/1511
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if (webpackModule && webpackModule.hot && webpackModule.hot.status() !== 'idle') {
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console.log(`Waiting webpack to became "idle" to initialize the page: "${route}"`)
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const check = (status) => {
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if (status === 'idle') {
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webpackModule.hot.removeStatusHandler(check)
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register()
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}
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}
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webpackModule.hot.status(check)
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} else {
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register()
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}
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}
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clearCache (route) {
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route = this.normalizeRoute(route)
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delete this.pageCache[route]
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delete this.loadingRoutes[route]
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}
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}
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