[openstreetmap/openstreetmap-website] Get directions using fetch (PR #5642)

[Holger Jeromin]

@HolgerJeromin commented on this pull request.



> -    routeRequest = chosenEngine.getRoute(points, function (err, route) {
-      routeRequest = null;
-
-      if (err) {
-        map.removeLayer(polyline);
-
-        if (reportErrors) {
-          $("#sidebar_content").html("<div class=\"alert alert-danger\">" + I18n.t("javascripts.directions.errors.no_route") + "</div>");
-        }
-
-        return;
-      }
-
+    controller = new AbortController();
+    awaitingRoute = true;
+    chosenEngine.getRoute(points, controller.signal).then(function (route) {
       polyline

Add `controller = undefined;` here. Same in `catch`

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