onClear event added

frontend-js/src/main/js/map/overlay/AbstractDbOverlay.js

@@ -31,6 +31,7 @@ function AbstractDbOverlay(params) {
   this._elementsByQuery = [];
   this._elementsByQuery[""] = [];
   this.registerListenerType('onSearch');
+  this.registerListenerType('onClear');
   this.registerListenerType('onTargetVisibilityChange');
 
   this.setQueries([]);
@@ -178,7 +179,10 @@ AbstractDbOverlay.prototype.searchByEncodedQuery = function(originalQuery, fitBo
 };
 
 AbstractDbOverlay.prototype.clear = function() {
-  return this.searchByQuery("");
+  var self = this;
+  return self.searchByQuery("").then(function() {
+    return self.callListeners('onClear');
+  });
 };
 
 /**