Cache "not found" reverse geocoding results

[rails.git] / app / assets / javascripts / index / directions-endpoint.js

diff --git a/app/assets/javascripts/index/directions-endpoint.js b/app/assets/javascripts/index/directions-endpoint.js
index 0f53e77d931be01462e74628ab33886aa892dcfe..6a3cd7c269edda3a3bdbc68f7a73e0ee68fa9683 100644 (file)
--- a/app/assets/javascripts/index/directions-endpoint.js
+++ b/app/assets/javascripts/index/directions-endpoint.js
@@ -1,4 +1,4 @@
-OSM.DirectionsEndpoint = function Endpoint(map, input, iconUrl, dragCallback, geocodeCallback) {
+OSM.DirectionsEndpoint = function Endpoint(map, input, iconUrl, dragCallback, changeCallback) {

   var endpoint = {};
 
   endpoint.marker = L.marker([0, 0], {
   var endpoint = {};
 
   endpoint.marker = L.marker([0, 0], {


@@ -14,71 +14,156 @@ OSM.DirectionsEndpoint = function Endpoint(map, input, iconUrl, dragCallback, ge
     autoPan: true
   });
 
     autoPan: true
   });
 

-  endpoint.marker.on("drag dragend", function (e) {
-    endpoint.setLatLng(e.target.getLatLng());
+  endpoint.enable = function () {
+    endpoint.marker.on("drag dragend", markerDragListener);
+    input.on("keydown", inputKeydownListener);
+    input.on("change", inputChangeListener);
+  };
+
+  endpoint.disable = function () {
+    endpoint.marker.off("drag dragend", markerDragListener);
+    input.off("keydown", inputKeydownListener);
+    input.off("change", inputChangeListener);
+
+    if (endpoint.geocodeRequest) endpoint.geocodeRequest.abort();
+    delete endpoint.geocodeRequest;
+    removeLatLng();
+    delete endpoint.value;
+    input.val("");
+    map.removeLayer(endpoint.marker);
+  };
+
+  function markerDragListener(e) {
+    var latlng = convertLatLngToZoomPrecision(e.target.getLatLng());
+
+    if (endpoint.geocodeRequest) endpoint.geocodeRequest.abort();
+    delete endpoint.geocodeRequest;
+
+    setLatLng(latlng);
+    setInputValueFromLatLng(latlng);
+    endpoint.value = input.val();
+    if (e.type === "dragend") getReverseGeocode();

     dragCallback(e.type === "drag");
     dragCallback(e.type === "drag");

-  });
+  }

 
 

-  input.on("keydown", function () {
+  function inputKeydownListener() {

     input.removeClass("is-invalid");
     input.removeClass("is-invalid");

-  });
+  }

 
 

-  input.on("change", function (e) {
+  function inputChangeListener(e) {

     // make text the same in both text boxes
     var value = e.target.value;
     endpoint.setValue(value);
     // make text the same in both text boxes
     var value = e.target.value;
     endpoint.setValue(value);

-  });
+  }

 
 

-  endpoint.setValue = function (value, latlng) {
-    endpoint.value = value;
-    delete endpoint.latlng;
+  endpoint.setValue = function (value) {
+    if (endpoint.geocodeRequest) endpoint.geocodeRequest.abort();
+    delete endpoint.geocodeRequest;

     input.removeClass("is-invalid");
     input.removeClass("is-invalid");

+
+    var coordinatesMatch = value.match(/^\s*([+-]?\d+(?:\.\d*)?)(?:\s+|\s*[/,]\s*)([+-]?\d+(?:\.\d*)?)\s*$/);
+    var latlng = coordinatesMatch && L.latLng(coordinatesMatch[1], coordinatesMatch[2]);
+
+    if (latlng && endpoint.cachedReverseGeocode && endpoint.cachedReverseGeocode.latlng.equals(latlng)) {
+      setLatLng(latlng);
+      if (endpoint.cachedReverseGeocode.notFound) {
+        endpoint.value = value;
+        input.addClass("is-invalid");
+      } else {
+        endpoint.value = endpoint.cachedReverseGeocode.value;
+      }
+      input.val(endpoint.value);
+      changeCallback();
+      return;
+    }
+
+    endpoint.value = value;
+    removeLatLng();

     input.val(value);
 
     if (latlng) {
     input.val(value);
 
     if (latlng) {

-      endpoint.setLatLng(latlng);
-    } else {
-      endpoint.getGeocode();
+      setLatLng(latlng);
+      setInputValueFromLatLng(latlng);
+      getReverseGeocode();
+      changeCallback();
+    } else if (endpoint.value) {
+      getGeocode();

     }
   };
 
     }
   };
 

-  endpoint.getGeocode = function () {
-    // if no one has entered a value yet, then we can't geocode, so don't
-    // even try.
-    if (!endpoint.value) {
-      return;
-    }
-
-    endpoint.awaitingGeocode = true;
+  endpoint.swapCachedReverseGeocodes = function (otherEndpoint) {
+    var g0 = endpoint.cachedReverseGeocode;
+    var g1 = otherEndpoint.cachedReverseGeocode;
+    delete endpoint.cachedReverseGeocode;
+    delete otherEndpoint.cachedReverseGeocode;
+    if (g0) otherEndpoint.cachedReverseGeocode = g0;
+    if (g1) endpoint.cachedReverseGeocode = g1;
+  };

 
 

+  function getGeocode() {

     var viewbox = map.getBounds().toBBoxString(); // <sw lon>,<sw lat>,<ne lon>,<ne lat>
     var viewbox = map.getBounds().toBBoxString(); // <sw lon>,<sw lat>,<ne lon>,<ne lat>

+    var geocodeUrl = OSM.NOMINATIM_URL + "search?q=" + encodeURIComponent(endpoint.value) + "&format=json&viewbox=" + viewbox;

 
 

-    $.getJSON(OSM.NOMINATIM_URL + "search?q=" + encodeURIComponent(endpoint.value) + "&format=json&viewbox=" + viewbox, function (json) {
-      endpoint.awaitingGeocode = false;
-      endpoint.hasGeocode = true;
+    endpoint.geocodeRequest = $.getJSON(geocodeUrl, function (json) {
+      delete endpoint.geocodeRequest;

       if (json.length === 0) {
         input.addClass("is-invalid");
         alert(I18n.t("javascripts.directions.errors.no_place", { place: endpoint.value }));
         return;
       }
 
       if (json.length === 0) {
         input.addClass("is-invalid");
         alert(I18n.t("javascripts.directions.errors.no_place", { place: endpoint.value }));
         return;
       }
 

-      endpoint.setLatLng(L.latLng(json[0]));
+      setLatLng(L.latLng(json[0]));

 
 

+      endpoint.value = json[0].display_name;

       input.val(json[0].display_name);
 
       input.val(json[0].display_name);
 

-      geocodeCallback();
+      changeCallback();

     });
     });

-  };
+  }

 
 

-  endpoint.setLatLng = function (ll) {
-    var precision = OSM.zoomPrecision(map.getZoom());
-    input.val(ll.lat.toFixed(precision) + ", " + ll.lng.toFixed(precision));
-    endpoint.hasGeocode = true;
+  function getReverseGeocode() {
+    var latlng = endpoint.latlng.clone();
+    var reverseGeocodeUrl = OSM.NOMINATIM_URL + "reverse?lat=" + latlng.lat + "&lon=" + latlng.lng + "&format=json";
+
+    endpoint.geocodeRequest = $.getJSON(reverseGeocodeUrl, function (json) {
+      delete endpoint.geocodeRequest;
+      if (!json || !json.display_name) {
+        endpoint.cachedReverseGeocode = { latlng: latlng, notFound: true };
+        return;
+      }
+
+      endpoint.value = json.display_name;
+      input.val(json.display_name);
+      endpoint.cachedReverseGeocode = { latlng: latlng, value: endpoint.value };
+    });
+  }
+
+  function setLatLng(ll) {
+    input
+      .attr("data-lat", ll.lat)
+      .attr("data-lon", ll.lng);

     endpoint.latlng = ll;
     endpoint.marker
       .setLatLng(ll)
       .addTo(map);
     endpoint.latlng = ll;
     endpoint.marker
       .setLatLng(ll)
       .addTo(map);

-  };
+  }
+
+  function removeLatLng() {
+    input
+      .removeAttr("data-lat")
+      .removeAttr("data-lon");
+    delete endpoint.latlng;
+  }
+
+  function setInputValueFromLatLng(latlng) {
+    input.val(latlng.lat + ", " + latlng.lng);
+  }
+
+  function convertLatLngToZoomPrecision(latlng) {
+    var precision = OSM.zoomPrecision(map.getZoom());
+
+    return L.latLng(latlng.lat.toFixed(precision), latlng.lng.toFixed(precision));
+  }

 
   return endpoint;
 };
 
   return endpoint;
 };