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@Zolmeister
Created August 11, 2017 20:45
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// send network request timings to Google Analytics
(function() {
var nativeOpen = XMLHttpRequest.prototype.open
var nativeSend = XMLHttpRequest.prototype.send
var startTime = null
var pendingCount = 0
XMLHttpRequest.prototype.open = function(_, url) {
this._url = url
return nativeOpen.apply(this, arguments)
}
XMLHttpRequest.prototype.send = function() {
if (this._url.indexOf('https://www.google-analytics.com') === -1) {
if (startTime == null) startTime = Date.now()
pendingCount += 1
this.addEventListener('loadend', function() {
pendingCount -= 1
if (this.responseURL.indexOf('https://www.google-analytics.com') !== -1) return
// group multiple network requests together,
// including those which are serially dependent
setTimeout(function() {
if (pendingCount == 0) {
var elapsed = Date.now() - startTime
var path = window.location.pathname + window.location.search
startTime = null
ga('send', 'timing', 'Network Chunk', 'load', elapsed, path)
}
})
})
}
return nativeSend.apply(this, arguments)
}
})()
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