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feat(style-inject): enable AMP inject #9

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4f7a147
feat(style-inject): added compatible AMP style inject
saschazar21 Oct 15, 2019
0503e81
fix(style-inject): removed head destructuring
saschazar21 Oct 15, 2019
40be5ac
fix(style-lint): fixed typos
saschazar21 Oct 15, 2019
cfe3670
fix(style-lint): fixed eslint errors
saschazar21 Oct 15, 2019
901f419
fix(style-inject): fixed attribute value
saschazar21 Oct 16, 2019
4c0f753
chore(style-inject): update README
saschazar21 Oct 16, 2019
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4 changes: 2 additions & 2 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -27,10 +27,10 @@ styleInject(css, options);
### insertAt

Type: `string`<br>
Possible values: `top`<br>
Possible values: `top`, `amp`<br>
Default: `undefined`

Insert `style` tag to specific position of `head` element.
Insert `style` tag to specific position of `head` element. If `amp` was selected, the whole CSS string gets injected in a single `<style amp-custom>...</style>` element, according to the [AMP docs](https://amp.dev/documentation/guides-and-tutorials/develop/style_and_layout/?format=websites#add-styles-to-a-page).

## License

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42 changes: 28 additions & 14 deletions src/index.js
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Original file line number Diff line number Diff line change
@@ -1,23 +1,37 @@
export default function styleInject(css, { insertAt } = {}) {
if (!css || typeof document === 'undefined') return

const ampStyleSelector = 'style[amp-custom]'

const head = document.head || document.getElementsByTagName('head')[0]
const style = document.createElement('style')
style.type = 'text/css'
const ampStyle = head.querySelector(ampStyleSelector) || style

if (insertAt === 'top') {
if (head.firstChild) {
head.insertBefore(style, head.firstChild)
} else {
head.appendChild(style)
}
} else {
head.appendChild(style)
}
switch (insertAt) {
// AMP only allows a single <script> tag with an 'amp-custom' attribute set
case 'amp':
style.setAttribute('amp-custom', '')
ampStyle.innerText += css

if (!head.querySelector(ampStyleSelector)) {
head.appendChild(ampStyle)
}
break
// By default styleInject appends a new <style> tag in <head>
case 'top':
default:
style.type = 'text/css'

if (style.styleSheet) {
style.styleSheet.cssText = css
} else {
style.appendChild(document.createTextNode(css))
}

if (style.styleSheet) {
style.styleSheet.cssText = css
} else {
style.appendChild(document.createTextNode(css))
if (head.firstChild && insertAt === 'top') {
head.insertBefore(style, head.firstChild)
} else {
head.appendChild(style)
}
}
}