Deduplicate nearby station requests

config-route.js

@@ -183,25 +183,31 @@ function rebuildSuggestions() {
         if (nearbyStatus === 'notRequested') {
             suggestionsArea.appendChild(a('', 'Load nearby stations').event$('click', function (event) {
                 event.preventDefault()
+                var latitude = 0
+                var longitude = 0
                 var watchId = navigator.geolocation.watchPosition(
                     function (data) {
-                        var geoUrl = new URL('https://v6.db.transport.rest/locations/nearby')
-                        geoUrl.searchParams.append('latitude', data.coords.latitude.toString())
-                        geoUrl.searchParams.append('longitude', data.coords.longitude.toString())
-                        geoUrl.searchParams.append('results', '10')
-                        fetch(geoUrl)
-                            .then(function (response) {
-                                return response.json()
-                            })
-                            .then(function (data) {
-                                nearbyStatus = 'gotData'
-                                nearbyStations = data
-                                rebuildSuggestions()
-                            })
-                            .catch(function () {
-                                nearbyStatus = 'unavailable'
-                                rebuildSuggestions()
-                            })
+                        if (data.coords.latitude !== latitude || data.coords.longitude !== longitude) {
+                            latitude = data.coords.latitude
+                            longitude = data.coords.longitude
+                            var geoUrl = new URL('https://v6.db.transport.rest/locations/nearby')
+                            geoUrl.searchParams.append('latitude', data.coords.latitude.toString())
+                            geoUrl.searchParams.append('longitude', data.coords.longitude.toString())
+                            geoUrl.searchParams.append('results', '10')
+                            fetch(geoUrl)
+                                .then(function (response) {
+                                    return response.json()
+                                })
+                                .then(function (data) {
+                                    nearbyStatus = 'gotData'
+                                    nearbyStations = data
+                                    rebuildSuggestions()
+                                })
+                                .catch(function () {
+                                    nearbyStatus = 'unavailable'
+                                    rebuildSuggestions()
+                                })
+                        }
                     },
                     function (error) {
                         if (nearbyStations.length === 0) {

station.js

@@ -145,25 +145,31 @@ function rebuildSuggestions() {
 		if (nearbyStatus === 'notRequested') {
 			suggestionsArea.appendChild(a('', 'Load nearby stations').event$('click', function (event) {
 				event.preventDefault()
+				var latitude = 0
+				var longitude = 0
 				var watchId = navigator.geolocation.watchPosition(
 					function (data) {
-						var geoUrl = new URL('https://v6.db.transport.rest/locations/nearby')
-						geoUrl.searchParams.append('latitude', data.coords.latitude.toString())
-						geoUrl.searchParams.append('longitude', data.coords.longitude.toString())
-						geoUrl.searchParams.append('results', '10')
-						fetch(geoUrl)
-							.then(function (response) {
-								return response.json()
-							})
-							.then(function (data) {
-								nearbyStatus = 'gotData'
-								nearbyStations = data
-								rebuildSuggestions()
-							})
-							.catch(function () {
-								nearbyStatus = 'unavailable'
-								rebuildSuggestions()
-							})
+						if (data.coords.latitude !== latitude || data.coords.longitude !== longitude) {
+							latitude = data.coords.latitude
+							longitude = data.coords.longitude
+							var geoUrl = new URL('https://v6.db.transport.rest/locations/nearby')
+							geoUrl.searchParams.append('latitude', data.coords.latitude.toString())
+							geoUrl.searchParams.append('longitude', data.coords.longitude.toString())
+							geoUrl.searchParams.append('results', '10')
+							fetch(geoUrl)
+								.then(function (response) {
+									return response.json()
+								})
+								.then(function (data) {
+									nearbyStatus = 'gotData'
+									nearbyStations = data
+									rebuildSuggestions()
+								})
+								.catch(function () {
+									nearbyStatus = 'unavailable'
+									rebuildSuggestions()
+								})
+						}
 					},
 					function (error) {
 						if (nearbyStations.length === 0) {