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interface ClicksWindow extends Window {
clicksWsUrl?: string
}
const CLICKS_WSURL: string | undefined = (<ClicksWindow>window).clicksWsUrl
class Session {
private wss: WebSocketStream
private queue: string[] = []
private writer: WritableStreamDefaultWriter | undefined
private url: string | undefined
private header: string | undefined
constructor(url: string, header: string) {
this.wss = new WebSocketStream(url)
this.header = header
}
async connect() {
const openInfo = await this.wss.opened
this.writer = openInfo.writable.getWriter()
for (const event of this.queue) {
void this.writer.write(event)
}
}
reportEvent(event: string) {
// Could do this with NavigateEvent instead,
// but then we would report all navigations,
// even if there are no clicks, which is unnecessary.
if (window.location.href !== this.url) {
if (this.header !== undefined) {
this.pushEvent(this.header)
this.header = undefined
}
this.url = window.location.href
this.pushEvent(`u|${this.url}`)
}
this.pushEvent(event)
}
private pushEvent(event: string) {
if (this.writer === undefined) {
this.queue.push(event)
} else {
void this.writer.write(event)
}
}
}
function startSession(data: string): Session | undefined {
if (CLICKS_WSURL === undefined) return undefined
const session = new Session(CLICKS_WSURL, data)
void session.connect()
return session
}
document.addEventListener("DOMContentLoaded", () => {
const ua = navigator.userAgentData?.brands
?.map((brand) => `${brand.brand}:${brand.version}`)
.join(",")
const session = startSession(
`${document.documentElement.clientWidth}|${document.documentElement.clientHeight}|${ua}`
)
if (session !== undefined) {
document.documentElement.addEventListener(
"click",
(e: MouseEvent) => {
const target =
e.target instanceof HTMLElement ? e.target.tagName : ""
const x = e.pageX / document.documentElement.clientWidth
// clientWidth is NOT a typo, using width as scale,
// to not have to know height of rendered document when
// showing.
const y = e.pageY / document.documentElement.clientWidth
session.reportEvent(`${x}|${y}|${target}`)
},
{
capture: true,
}
)
}
})
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