mirror of https://github.com/nuxt/nuxt.git
78 lines
2.6 KiB
JavaScript
78 lines
2.6 KiB
JavaScript
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<% if (router.scrollBehavior) { %>
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export default <%= serializeFunction(router.scrollBehavior) %>
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<% } else { %>import { getMatchedComponents } from './utils'
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if (process.client) {
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if ('scrollRestoration' in window.history) {
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window.history.scrollRestoration = 'manual'
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// reset scrollRestoration to auto when leaving page, allowing page reload
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// and back-navigation from other pages to use the browser to restore the
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// scrolling position.
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window.addEventListener('beforeunload', () => {
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window.history.scrollRestoration = 'auto'
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})
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// Setting scrollRestoration to manual again when returning to this page.
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window.addEventListener('load', () => {
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window.history.scrollRestoration = 'manual'
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})
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}
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}
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export default function (to, from, savedPosition) {
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// if the returned position is falsy or an empty object,
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// will retain current scroll position.
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let position = false
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// if no children detected and scrollToTop is not explicitly disabled
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const Pages = getMatchedComponents(to)
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if (
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Pages.length < 2 &&
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Pages.every(Page => Page.options.scrollToTop !== false)
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) {
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// scroll to the top of the page
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position = { x: 0, y: 0 }
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} else if (Pages.some(Page => Page.options.scrollToTop)) {
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// if one of the children has scrollToTop option set to true
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position = { x: 0, y: 0 }
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}
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// savedPosition is only available for popstate navigations (back button)
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if (savedPosition) {
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position = savedPosition
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}
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const nuxt = window.<%= globals.nuxt %>
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// triggerScroll is only fired when a new component is loaded
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if (to.path === from.path && to.hash !== from.hash) {
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nuxt.$nextTick(() => nuxt.$emit('triggerScroll'))
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}
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return new Promise((resolve) => {
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// wait for the out transition to complete (if necessary)
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nuxt.$once('triggerScroll', () => {
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// coords will be used if no selector is provided,
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// or if the selector didn't match any element.
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if (to.hash) {
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let hash = to.hash
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// CSS.escape() is not supported with IE and Edge.
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if (typeof window.CSS !== 'undefined' && typeof window.CSS.escape !== 'undefined') {
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hash = '#' + window.CSS.escape(hash.substr(1))
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}
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try {
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if (document.querySelector(hash)) {
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// scroll to anchor by returning the selector
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position = { selector: hash }
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}
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} catch (e) {
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console.warn('Failed to save scroll position. Please add CSS.escape() polyfill (https://github.com/mathiasbynens/CSS.escape).')
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}
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}
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resolve(position)
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})
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})
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}
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<% } %>
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