See #964 - not only should we cancel ajax requests when we destroy the tile, but also when we initiate a new response. which is to say that when we instruct the tile to run a new request, we can discard the old one(s). that is what this patch does (as well as cleaning up memory in the destroy). Note that I have added this.request.destroy(); call, but commented out. this is a nod to future development/improvement of the OpenLayers.Ajax.Base and OpenLayers.Ajax.Request class to give it its own destroy() method. Just for fun I'll go ahead and open a separate ticket for that: #1277. Thanks elemoine for the reviews and the good dialogue to finishing up this patch.

git-svn-id: http://svn.openlayers.org/trunk/openlayers@5777 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Tile/WFS.js

@@ -67,6 +67,8 @@ OpenLayers.Tile.WFS = OpenLayers.Class(OpenLayers.Tile, {
         this.url = null;
         if(this.request) {
             this.request.transport.abort();
+            //this.request.destroy();
+            this.request = null;
         }
     },
 
@@ -108,6 +110,10 @@ OpenLayers.Tile.WFS = OpenLayers.Class(OpenLayers.Tile, {
     * failure - {function}
     */
     loadFeaturesForRegion:function(success, failure) {
+        if(this.request) {
+            this.request.transport.abort();
+            //this.request.destroy();
+        }
         this.request = OpenLayers.loadURL(this.url, null, this, success);
     },
     
@@ -141,6 +147,10 @@ OpenLayers.Tile.WFS = OpenLayers.Class(OpenLayers.Tile, {
         if (this.events) {
             this.events.triggerEvent("loadend"); 
         }
+
+        //request produced with success, we can delete the request object.
+        //this.request.destroy();
+        this.request = null;
     },
 
     /**

tests/Tile/test_WFS.html

@@ -27,7 +27,16 @@
     }
 
     function test_Tile_WFS_requestSuccess(t) {
-        t.plan(1);
+        t.plan(2);
+
+		var tile = {
+			'request': {}
+		};
+			
+		OpenLayers.Tile.WFS.prototype.requestSuccess.apply(tile, []);
+		
+		t.ok(tile.request == null, "request property on tile set to null");
+
         var layer = {}; // bogus layer
         var position = new OpenLayers.Pixel(10,20);
         var bounds = new OpenLayers.Bounds(1,2,3,4);
@@ -41,8 +50,41 @@
         
     }
     
+    function test_Tile_WFS_loadFeaturesForRegion(t) {
+    	t.plan(9);
+		
+		var tile = {
+			'url': {}
+		};
+
+		var g_Success = {};		
+
+		var tLoadURL = OpenLayers.loadURL;
+		OpenLayers.loadURL = function(url, params, caller, onComplete) {
+			t.ok(url == tile.url, "tile's url correctly passed as 1st param to loadURL");
+			t.ok(params == null, "null passed as 2nd param to loadURL");
+			t.ok(caller == tile, "tile passed as 3rd param to loadURL");
+			t.ok(onComplete == g_Success, "success param from loadFeaturesForRegion() passed as 4th param to loadURL");
+		};
+		
+	  //no running request -- 4 tests
+		OpenLayers.Tile.WFS.prototype.loadFeaturesForRegion.apply(tile, [g_Success]);
+
+	  //running request (cancelled) -- 4 tests + 1 test (for request abort)
+		tile.request = {
+			'transport': {
+				'abort': function() {
+					t.ok(true, "request aborted");
+				}
+			}
+		};
+		OpenLayers.Tile.WFS.prototype.loadFeaturesForRegion.apply(tile, [g_Success]);
+		    	
+		OpenLayers.loadURL = tLoadURL;
+    }
+    
     function test_Tile_WFS_destroy(t) {
-        t.plan(8);
+        t.plan(9);
 
         var layer = {}; // bogus layer
         var position = new OpenLayers.Pixel(10,20);
@@ -73,6 +115,7 @@
         t.ok(tile.size == null, "tile.size set to null");
         t.ok(tile.position == null, "tile.position set to null");
         t.ok(_gAbort, "request transport is aborted");
+        t.ok(tile.request == null, "tile.request set to null");
         
         t.ok(tile.events == null, "tile.events set to null");