How to use watchPosition () to monitor visitors' activities
Today, the editor will share with you the relevant knowledge about how to use watchPosition () to monitor the activities of visitors. The content is detailed and the logic is clear. I believe most people still know too much about this, so share this article for your reference. I hope you can get something after reading this article. Let's take a look at it.
All the examples we have used so far depend on this getCurrentPosition () method. However, geolocation objects have another method, watchPosition (), which allows you to track the movement of visitors by returning to the updated location when the location changes.
The watchPosition () input parameter is the same as getCurrentPosition (). However, watchPosition () may trigger the success function multiple times-the first time a location is fetched, and each time a new location is detected. Let's see how it works:
Watching Position
/ / Set global variable
Var watchID
Function showPosition () {
If (navigator.geolocation) {
WatchID = navigator.geolocation.watchPosition (successCallback)
} else {
Alert ("Sorry, your browser does not support HTML5 geolocation.")
}
}
Function successCallback (position) {
ToggleWatchBtn [XSS _ clean] = "Stop Watching"
/ / Check position has been changed or not before doing anything
If (prevLat! = position.coords.latitude | | prevLong! = position.coords.longitude) {
/ / Set previous location
Var prevLat = position.coords.latitude
Var prevLong = position.coords.longitude
/ / Get current position
Var positionInfo = "Your current position is (" + "Latitude:" + position.coords.latitude + "," + "Longitude:" + position.coords.longitude + ")"
Document.getElementById ("result") [xss_clean] = positionInfo
}
}
Function startWatch () {
Var result = document.getElementById ("result")
Var toggleWatchBtn = document.getElementById ("toggleWatchBtn")
ToggleWatchBtn.onclick = function () {
If (watchID) {
ToggleWatchBtn [XSS _ clean] = "Start Watching"
Navigator.geolocation.clearWatch (watchID)
WatchID = false
} else {
ToggleWatchBtn [XSS _ clean] = "Aquiring Geo Location..."
ShowPosition ()
}
}
}
/ / Initialise the whole system (above)
_ window.onload = startWatch
Start Watching
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