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feat(runtime-dom): support mount app on ShadowRoot #2447

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merged 2 commits into from
Dec 4, 2020
Merged

feat(runtime-dom): support mount app on ShadowRoot #2447

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9bf6595
feat(runtime-dom): support mount app on ShadowRoot
unbyte Oct 20, 2020
4772e64
feat(runtime-dom): refactor
unbyte Oct 20, 2020
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23 changes: 18 additions & 5 deletions packages/runtime-dom/src/index.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -58,7 +58,7 @@ export const createApp = ((...args) => {
}

const { mount } = app
app.mount = (containerOrSelector: Element | string): any => {
app.mount = (containerOrSelector: Element | ShadowRoot | string): any => {
const container = normalizeContainer(containerOrSelector)
if (!container) return
const component = app._component
Expand All @@ -68,8 +68,10 @@ export const createApp = ((...args) => {
// clear content before mounting
container.innerHTML = ''
const proxy = mount(container)
container.removeAttribute('v-cloak')
container.setAttribute('data-v-app', '')
if (!container.__isShadowRoot) {
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container.removeAttribute('v-cloak')
container.setAttribute('data-v-app', '')
}
return proxy
}

Expand All @@ -84,7 +86,7 @@ export const createSSRApp = ((...args) => {
}

const { mount } = app
app.mount = (containerOrSelector: Element | string): any => {
app.mount = (containerOrSelector: Element | ShadowRoot | string): any => {
const container = normalizeContainer(containerOrSelector)
if (container) {
return mount(container, true)
Expand All @@ -103,14 +105,25 @@ function injectNativeTagCheck(app: App) {
})
}

function normalizeContainer(container: Element | string): Element | null {
function normalizeContainer(
container: Element | ShadowRoot | string
): Element & { __isShadowRoot?: boolean } | null {
if (isString(container)) {
const res = document.querySelector(container)
if (__DEV__ && !res) {
warn(`Failed to mount app: mount target selector returned null.`)
}
return res
}
if (container instanceof ShadowRoot) {
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mode: 'closed' doesn't actually prevent Vue from mounting to it (see https://blog.revillweb.com/open-vs-closed-shadow-dom-9f3d7427d1af) so this whole check is unnecessary

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no in-depth study yet, but at least input can't work
https://codepen.io/unbyte/pen/XWKjaVO?editors=1010

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Isn't it working? https://codepen.io/yyx990803/pen/KKMgooN?editors=1010

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I know why now. It's a regression of Vimium, an extension that I enabled in my browsers. philc/vimium#853

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So I wonder if warnings should be retained so that developers can be aware that some of the problems may be caused by the closed shadow root, for what the user side is using is beyond developers' control

if (__DEV__ && container.mode === 'closed') {
warn(
`mounting on a ShadowRoot with \`{mode: "closed"}\` may lead to unpredictable bugs`
)
}
;(container as any).__isShadowRoot = true
return container as any
}
return container
}

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