msb-public
/
vitepress
mirror of https://github.com/vuejs/vitepress
2
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Code Issues Projects Releases Wiki Activity

perf: only update necessary head tags in prod

Browse Source
pull/325/head
Evan You 4 years ago
parent c046905b03
commit e6bb5a4806
2 changed files with 24 additions and 23 deletions
Show Stats Download Patch File Download Diff File

44
src/client/app/composables/head.ts
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@ -3,7 +3,7 @@ import { HeadConfig, SiteData } from '../../shared'
import { Route } from '../router'
export function useUpdateHead(route: Route, siteDataByRouteRef: Ref<SiteData>) {
let metaTagEls: HTMLElement[] = Array.from(document.querySelectorAll('meta'))
let managedHeadTags: HTMLElement[] = []
let isFirstUpdate = true
const updateHeadTags = (newTags: HeadConfig[]) => {
@ -14,11 +14,14 @@ export function useUpdateHead(route: Route, siteDataByRouteRef: Ref<SiteData>) {
return
}
console.log(managedHeadTags)
console.log(newTags)
const newEls: HTMLElement[] = []
const commonLength = Math.min(metaTagEls.length, newTags.length)
const commonLength = Math.min(managedHeadTags.length, newTags.length)
for (let i = 0; i < commonLength; i++) {
let el = metaTagEls[i]
const [tag, attrs] = newTags[i]
let el = managedHeadTags[i]
const [tag, attrs, innerHTML = ''] = newTags[i]
if (el.tagName.toLocaleLowerCase() === tag) {
for (const key in attrs) {
if (el.getAttribute(key) !== attrs[key]) {
@ -31,6 +34,9 @@ export function useUpdateHead(route: Route, siteDataByRouteRef: Ref<SiteData>) {
el.removeAttribute(name)
}
}
if (el.innerHTML !== innerHTML) {
el.innerHTML = innerHTML
}
} else {
document.head.removeChild(el)
el = createHeadElement(newTags[i])
@ -39,7 +45,7 @@ export function useUpdateHead(route: Route, siteDataByRouteRef: Ref<SiteData>) {
newEls.push(el)
}
metaTagEls
managedHeadTags
.slice(commonLength)
.forEach((el) => document.head.removeChild(el))
newTags.slice(commonLength).forEach((headConfig) => {
@ -47,7 +53,7 @@ export function useUpdateHead(route: Route, siteDataByRouteRef: Ref<SiteData>) {
document.head.appendChild(el)
newEls.push(el)
})
metaTagEls = newEls
managedHeadTags = newEls
}
watchEffect(() => {
@ -56,25 +62,17 @@ export function useUpdateHead(route: Route, siteDataByRouteRef: Ref<SiteData>) {
const pageTitle = pageData && pageData.title
const pageDescription = pageData && pageData.description
const frontmatterHead = pageData && pageData.frontmatter.head
// update title and description
document.title = (pageTitle ? pageTitle + ` | ` : ``) + siteData.title
document
.querySelector(`meta[name=description]`)!
.setAttribute('content', pageDescription || siteData.description)
updateHeadTags([
['meta', { charset: 'utf-8' }],
[
'meta',
{
name: 'viewport',
content: 'width=device-width,initial-scale=1'
}
],
[
'meta',
{
name: 'description',
content: pageDescription || siteData.description
}
],
...siteData.head,
...((frontmatterHead && filterOutHeadDescription(frontmatterHead)) || [])
// site head can only change during dev
...(import.meta.env.DEV ? siteData.head : []),
...(frontmatterHead ? filterOutHeadDescription(frontmatterHead) : [])
])
})
}

3
src/node/plugin.ts
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@ -124,7 +124,10 @@ export function createVitePressPlugin(
<!DOCTYPE html>
<html>
<head>
<title></title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width,initial-scale=1">
<meta name="description" content="">
</head>
<body>
<div id="app"></div>

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