ZwiiCMS/core/vendor/favicon-switcher/favicon-switcher.js
2020-09-19 17:35:02 +02:00

57 lines
1.4 KiB
JavaScript

;(function(mod){
function collectLinks() {
return Array.prototype.slice.apply(
document.head.querySelectorAll('link[rel*="icon"]')
)
}
function applyLink(source, target) {
target.setAttribute('type', source.getAttribute('type'))
target.setAttribute('href', source.getAttribute('href'))
}
// eslint-disable-next-line no-unused-vars
function initSwitcher(delay) {
// Exit if media queries aren't supported
if (typeof window.matchMedia !== 'function') {
return function noop() {}
}
var links = collectLinks()
var current = document.createElement('link')
var prevMatch
current.setAttribute('rel', 'shortcut icon')
document.head.appendChild(current)
function faviconApplyLoop() {
links.forEach(function(link) {
if (window.matchMedia(link.media).matches) {
if (link.media !== prevMatch) {
prevMatch = link.media
applyLink(link, current)
}
}
})
}
var intervalId = setInterval(faviconApplyLoop, delay || 300)
function unsubscribe() {
clearInterval(intervalId)
links.forEach(function(link) {
document.head.appendChild(link)
})
}
faviconApplyLoop()
links.forEach(function(link) {
document.head.removeChild(link)
})
return unsubscribe
}
initSwitcher()
})()