Reverse-geocode on endpoint marker drag end

[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 d111eca35f2682729053f9b1862cb0404aaa5e02..604dcc2b6c6b8ed3a0751531dec9a0f452be92ed 100644 (file)
--- a/app/assets/javascripts/index/directions-endpoint.js
+++ b/app/assets/javascripts/index/directions-endpoint.js
@@ -14,34 +14,64 @@ OSM.DirectionsEndpoint = function Endpoint(map, input, iconUrl, dragCallback, ch
     autoPan: true
   });
 
-  endpoint.marker.on("drag dragend", function (e) {
-    var latlng = 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");
-  });
+  }
 
-  input.on("keydown", function () {
+  function inputKeydownListener() {
     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);
-  });
+  }
 
-  endpoint.setValue = function (value, latlng) {
+  endpoint.setValue = function (value) {
     endpoint.value = value;
-    delete endpoint.latlng;
+    removeLatLng();
     input.removeClass("is-invalid");
     input.val(value);
 
+    if (endpoint.geocodeRequest) endpoint.geocodeRequest.abort();
+    delete endpoint.geocodeRequest;
+
+    var coordinatesMatch = value.match(/^\s*([+-]?\d+(?:\.\d*)?)(?:\s+|\s*[/,]\s*)([+-]?\d+(?:\.\d*)?)\s*$/);
+    var latlng = coordinatesMatch && L.latLng(coordinatesMatch[1], coordinatesMatch[2]);
+
     if (latlng) {
       setLatLng(latlng);
       setInputValueFromLatLng(latlng);
+      getReverseGeocode();
       changeCallback();
     } else if (endpoint.value) {
       getGeocode();
@@ -49,12 +79,11 @@ OSM.DirectionsEndpoint = function Endpoint(map, input, iconUrl, dragCallback, ch
   };
 
   function getGeocode() {
-    endpoint.awaitingGeocode = true;
-
     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.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 }));
@@ -69,17 +98,45 @@ OSM.DirectionsEndpoint = function Endpoint(map, input, iconUrl, dragCallback, ch
     });
   }
 
+  function getReverseGeocode() {
+    var reverseGeocodeUrl = OSM.NOMINATIM_URL + "reverse?lat=" + endpoint.latlng.lat + "&lon=" + endpoint.latlng.lng + "&format=json";
+
+    endpoint.geocodeRequest = $.getJSON(reverseGeocodeUrl, function (json) {
+      delete endpoint.geocodeRequest;
+      if (!json || !json.display_name) {
+        return;
+      }
+
+      endpoint.value = json.display_name;
+      input.val(json.display_name);
+    });
+  }
+
   function setLatLng(ll) {
+    input
+      .attr("data-lat", ll.lat)
+      .attr("data-lon", ll.lng);
     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());
 
-    input.val(latlng.lat.toFixed(precision) + ", " + latlng.lng.toFixed(precision));
+    return L.latLng(latlng.lat.toFixed(precision), latlng.lng.toFixed(precision));
   }
 
   return endpoint;