Current File : //home/forge/takeaseat.eco-n-tech.co.uk/.nuxt/router.scrollBehavior.js
import { getMatchedComponents, setScrollRestoration } from './utils'
if (process.client) {
if ('scrollRestoration' in window.history) {
setScrollRestoration('manual')
// reset scrollRestoration to auto when leaving page, allowing page reload
// and back-navigation from other pages to use the browser to restore the
// scrolling position.
window.addEventListener('beforeunload', () => {
setScrollRestoration('auto')
})
// Setting scrollRestoration to manual again when returning to this page.
window.addEventListener('load', () => {
setScrollRestoration('manual')
})
}
}
function shouldScrollToTop(route) {
const Pages = getMatchedComponents(route)
if (Pages.length === 1) {
const { options = {} } = Pages[0]
return options.scrollToTop !== false
}
return Pages.some(({ options }) => options && options.scrollToTop)
}
export default function (to, from, savedPosition) {
// If the returned position is falsy or an empty object, will retain current scroll position
let position = false
const isRouteChanged = to !== from
// savedPosition is only available for popstate navigations (back button)
if (savedPosition) {
position = savedPosition
} else if (isRouteChanged && shouldScrollToTop(to)) {
position = { x: 0, y: 0 }
}
const nuxt = window.$nuxt
if (
// Initial load (vuejs/vue-router#3199)
!isRouteChanged ||
// Route hash changes
(to.path === from.path && to.hash !== from.hash)
) {
nuxt.$nextTick(() => nuxt.$emit('triggerScroll'))
}
return new Promise((resolve) => {
// wait for the out transition to complete (if necessary)
nuxt.$once('triggerScroll', () => {
// coords will be used if no selector is provided,
// or if the selector didn't match any element.
if (to.hash) {
let hash = to.hash
// CSS.escape() is not supported with IE and Edge.
if (typeof window.CSS !== 'undefined' && typeof window.CSS.escape !== 'undefined') {
hash = '#' + window.CSS.escape(hash.substr(1))
}
try {
if (document.querySelector(hash)) {
// scroll to anchor by returning the selector
position = { selector: hash }
}
} catch (e) {
console.warn('Failed to save scroll position. Please add CSS.escape() polyfill (https://github.com/mathiasbynens/CSS.escape).')
}
}
resolve(position)
})
})
}
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