function to reset handler

lib/OpenLayers/Control/UTFGrid.js

@@ -45,7 +45,7 @@ OpenLayers.Control.UTFGrid = OpenLayers.Class(OpenLayers.Control, {
      * options - {Object} Options for control.
      */
     defaultHandlerOptions: {
-        'delay': 500,
+        'delay': 200,
         'pixelTolerance': null,
         'stopMove': false,
         'single': true,
@@ -55,10 +55,23 @@ OpenLayers.Control.UTFGrid = OpenLayers.Class(OpenLayers.Control, {
         'stopDouble': false
     },
 
-    handlerMode: 'move',
+    /* Property: handlerMode
+     * Defaults to 'click'. Can be 'hover' or 'move'.
+     */
+    handlerMode: 'hover',
+
+    setHandler: function(hm) {
+        this.handlerMode = hm;
+        this.resetHandler();
+    },
+
+    resetHandler: function() {
+        if (this.handler) {
+            this.handler.deactivate();
+            this.handler.destroy();
+            this.handler = null;
+        }
    
-    setHandler: function() {
-        this.handler = null;
         if (this.handlerMode == 'hover') {
             // Handle this event on hover
             this.handler = new OpenLayers.Handler.Hover(
@@ -81,6 +94,11 @@ OpenLayers.Control.UTFGrid = OpenLayers.Class(OpenLayers.Control, {
                 this.handlerOptions
             );
         }
+        if (this.handler) {
+            return true;
+        } else {
+            return false;
+        }
     },
 
     initialize: function(options) {
@@ -90,7 +108,7 @@ OpenLayers.Control.UTFGrid = OpenLayers.Class(OpenLayers.Control, {
         OpenLayers.Control.prototype.initialize.apply(
             this, arguments
         ); 
-        this.setHandler();
+        this.resetHandler();
     }, 
 
     /**
@@ -124,7 +142,6 @@ OpenLayers.Control.UTFGrid = OpenLayers.Class(OpenLayers.Control, {
             var layer;
             for (var i=0, len=layers.length; i<len; i++) {
                 layer = layers[i];
-
                 var info = layer.getTileInfo( lonLat );
                 this.writeDebugInfo(info);
                 var tile = info.tile;
@@ -139,7 +156,8 @@ OpenLayers.Control.UTFGrid = OpenLayers.Class(OpenLayers.Control, {
                                 Math.floor((info.i) / resolution)
                             ));
                         attrs = data.data[data.keys[code]];
-                        this.callback(attrs);
+                        if (attrs)
+                            this.callback(attrs);
                     }
                 }
             }
@@ -178,7 +196,6 @@ OpenLayers.Control.UTFGrid = OpenLayers.Class(OpenLayers.Control, {
                 val += "<li>" + index + " : " + attrs[index] + "</li>";
             }
             val += "</ul>";
-            //var val = attrs.NAME + ": population " + attrs.POP2005;
             this.element.innerHTML = val;
             return true;
         } else {
@@ -207,7 +224,7 @@ OpenLayers.Control.UTFGrid = OpenLayers.Class(OpenLayers.Control, {
     reset: function(evt) {
         this.callback(null);
         if (this.element)
-            this.element.innerHTML = this.emptyString;
+            this.element.innerHTML = '';
     },
 
     /**