42 lines
1.2 KiB
JavaScript
42 lines
1.2 KiB
JavaScript
let meta = process.browser && document.getElementById('theThemeColor')
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let offlineStyle = process.browser && document.getElementById('theOfflineStyle')
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function getExistingThemeLink () {
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return document.head.querySelector('link[rel=stylesheet][href^="/theme-"]')
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}
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function resetExistingTheme () {
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let existingLink = getExistingThemeLink()
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if (existingLink) {
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document.head.removeChild(existingLink)
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}
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}
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function loadCSS (href) {
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let existingLink = getExistingThemeLink()
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let link = document.createElement('link')
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link.rel = 'stylesheet'
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link.href = href
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link.addEventListener('load', function onload () {
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link.removeEventListener('load', onload)
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if (existingLink) { // remove after load to avoid flash of default theme
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document.head.removeChild(existingLink)
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}
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})
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// inserting before the offline <style> ensures that the offline style wins when offline
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document.head.insertBefore(link, offlineStyle)
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}
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export function switchToTheme (themeName = 'default') {
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let themeColor = window.__themeColors[themeName]
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meta.content = themeColor || window.__themeColors['default']
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if (themeName !== 'default') {
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loadCSS(`/theme-${themeName}.css`)
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} else {
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resetExistingTheme()
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}
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}
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