Nuxt/packages/vue-app/template/router.scrollBehavior.js

81 lines
2.9 KiB
JavaScript

<% if (router.scrollBehavior) { %>
<%= isTest ? '/* eslint-disable quotes, semi, indent, comma-spacing, key-spacing, object-curly-spacing, space-before-function-paren */' : '' %>
export default <%= serializeFunction(router.scrollBehavior) %>
<%= isTest ? '/* eslint-enable quotes, semi, indent, comma-spacing, key-spacing, object-curly-spacing, space-before-function-paren */' : '' %>
<% } else { %>import { getMatchedComponents } from './utils'
if (process.client) {
if ('scrollRestoration' in window.history) {
window.history.scrollRestoration = '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', () => {
window.history.scrollRestoration = 'auto'
})
// Setting scrollRestoration to manual again when returning to this page.
window.addEventListener('load', () => {
window.history.scrollRestoration = 'manual'
})
}
}
export default function (to, from, savedPosition) {
// if the returned position is falsy or an empty object,
// will retain current scroll position.
let position = false
// if no children detected and scrollToTop is not explicitly disabled
const Pages = getMatchedComponents(to)
if (
Pages.length < 2 &&
Pages.every(Page => Page.options.scrollToTop !== false)
) {
// scroll to the top of the page
position = { x: 0, y: 0 }
} else if (Pages.some(Page => Page.options.scrollToTop)) {
// if one of the children has scrollToTop option set to true
position = { x: 0, y: 0 }
}
// savedPosition is only available for popstate navigations (back button)
if (savedPosition) {
position = savedPosition
}
const nuxt = window.<%= globals.nuxt %>
// triggerScroll is only fired when a new component is loaded
if (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) {
<%= isTest ? '// eslint-disable-next-line no-console' : '' %>
console.warn('Failed to save scroll position. Please add CSS.escape() polyfill (https://github.com/mathiasbynens/CSS.escape).')
}
}
resolve(position)
})
})
}
<% } %>