Plot axes do not show labels when no data

Added semicolon

Added test for hasDomainData()

Added test for negative case on domain data check

Removed label test due to mocked telemetry formatter

Uncommented test commented by accident

Removed extra space

platform/features/plot/src/SubPlot.js

@@ -64,6 +64,16 @@ define(
             this.updateTicks();
         }
 
+        /**
+         * Tests whether this subplot has domain data to show for the current pan/zoom level. Absence of domain data
+         * implies that there is no range data displayed either
+         * @returns {boolean} true if domain data exists for the current pan/zoom level
+         */
+        SubPlot.prototype.hasDomainData = function() {
+            return this.panZoomStack
+                && this.panZoomStack.getDimensions()[0] > 0;
+        };
+
         // Utility function for filtering out empty strings.
         function isNonEmpty(v) {
             return typeof v === 'string' && v !== "";
@@ -159,10 +169,10 @@ define(
             var tickGenerator =
                 new PlotTickGenerator(this.panZoomStack, this.formatter);
 
-                this.domainTicks =
-                    tickGenerator.generateDomainTicks(DOMAIN_TICKS);
-                this.rangeTicks =
-                    tickGenerator.generateRangeTicks(RANGE_TICKS);
+            this.domainTicks =
+                tickGenerator.generateDomainTicks(DOMAIN_TICKS);
+            this.rangeTicks =
+                tickGenerator.generateRangeTicks(RANGE_TICKS);
         };
 
         SubPlot.prototype.updatePan = function () {
@@ -253,7 +263,10 @@ define(
             this.hovering = true;
             this.subPlotBounds = $event.target.getBoundingClientRect();
             this.mousePosition = this.toMousePosition($event);
-            this.updateHoverCoordinates();
+            //If there is a domain to display, show hover coordinates, otherwise hover coordinates are meaningless
+            if (this.hasDomainData()) {
+                this.updateHoverCoordinates();
+            }
             if (this.marqueeStart) {
                 this.updateMarqueeBox();
             }

platform/features/plot/src/elements/PlotTickGenerator.js

@@ -53,7 +53,8 @@ define(
 
             for (i = 0; i < count; i += 1) {
                 result.push({
-                    label: format(i * step + start)
+                    //If data to show, display label for each tick line, otherwise show lines but suppress labels.
+                    label: span > 0 ? format(i * step + start) : ''
                 });
             }
 

platform/features/plot/test/SubPlotSpec.js

@@ -157,6 +157,15 @@ define(
                 );
             });
 
+            it ("indicates when there is domain data shown", function () {
+                expect(subplot.hasDomainData()).toEqual(true);
+            });
+
+            it ("indicates when there is no domain data shown", function () {
+                mockPanZoomStack.getDimensions.andReturn([0,0]);
+                expect(subplot.hasDomainData()).toEqual(false);
+            });
+            
             it("disallows marquee zoom when start and end Marquee is at the same position", function () {
                 expect(mockPanZoomStack.pushPanZoom).not.toHaveBeenCalled();