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Check online status before prefetching URLs #74

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Check online status before prefetching URLs #74

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5 changes: 5 additions & 0 deletions instantpage.js
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Original file line number Diff line number Diff line change
Expand Up @@ -6,6 +6,7 @@ const prefetches = new Set()
const prefetchElement = document.createElement('link')
const isSupported = prefetchElement.relList && prefetchElement.relList.supports && prefetchElement.relList.supports('prefetch')
&& window.IntersectionObserver && 'isIntersecting' in IntersectionObserverEntry.prototype
const isOnline = () => window.navigator.onLine
const allowQueryString = 'instantAllowQueryString' in document.body.dataset
const allowExternalLinks = 'instantAllowExternalLinks' in document.body.dataset
const useWhitelist = 'instantWhitelist' in document.body.dataset
Expand Down Expand Up @@ -223,6 +224,10 @@ function isPreloadable(linkElement) {
}

function preload(url) {
if (!isOnline()) {
return
}

if (prefetches.has(url)) {
return
}
Expand Down