Allow passing undefined to ol.layer.Vector#setStyle

src/ol/layer/vectorlayer.js

@@ -51,8 +51,7 @@ ol.layer.Vector = function(opt_options) {
    */
   this.styleFunction_ = undefined;
 
-  this.setStyle(goog.isDefAndNotNull(options.style) ?
-      options.style : ol.style.defaultStyleFunction);
+  this.setStyle(options.style);
 
 };
 goog.inherits(ol.layer.Vector, ol.layer.Layer);
@@ -102,13 +101,14 @@ ol.layer.Vector.prototype.setRenderOrder = function(renderOrder) {
 /**
  * Set the style for features.  This can be a single style object, an array
  * of styles, or a function that takes a feature and resolution and returns
- * an array of styles.
- * @param {ol.style.Style|Array.<ol.style.Style>|ol.style.StyleFunction} style
- *     Layer style.
+ * an array of styles. If `undefined` default styles are used.
+ * @param {ol.style.Style|Array.<ol.style.Style>|ol.style.StyleFunction|undefined}
+ *     style Layer style.
  * @api stable
  */
 ol.layer.Vector.prototype.setStyle = function(style) {
-  this.style_ = style;
-  this.styleFunction_ = ol.style.createStyleFunction(style);
+  this.style_ = goog.isDef(style) ? style : ol.style.defaultStyleFunction;
+  this.styleFunction_ = goog.isNull(style) ?
+      undefined : ol.style.createStyleFunction(this.style_);
   this.dispatchChangeEvent();
 };

test/spec/ol/layer/vectorlayer.test.js

@@ -50,22 +50,21 @@ describe('ol.layer.Vector', function() {
 
   describe('#setStyle()', function() {
 
-    var source = new ol.source.Vector();
-    var style = new ol.style.Style();
+    var layer, style;
+
+    beforeEach(function() {
+      layer = new ol.layer.Vector({
+        source: new ol.source.Vector()
+      });
+      style = new ol.style.Style();
+    });
 
     it('allows the style to be set after construction', function() {
-      var layer = new ol.layer.Vector({
-        source: source
-      });
-
       layer.setStyle(style);
       expect(layer.getStyle()).to.be(style);
     });
 
     it('dispatches the change event', function(done) {
-      var layer = new ol.layer.Vector({
-        source: source
-      });
       layer.on('change', function() {
         done();
       });
@@ -73,15 +72,25 @@ describe('ol.layer.Vector', function() {
     });
 
     it('updates the internal style function', function() {
-      var layer = new ol.layer.Vector({
-        source: source
-      });
       expect(layer.getStyleFunction()).to.be(ol.style.defaultStyleFunction);
       layer.setStyle(style);
       expect(layer.getStyleFunction()).not.to.be(
           ol.style.defaultStyleFunction);
     });
 
+    it('allows setting an null style', function() {
+      layer.setStyle(null);
+      expect(layer.getStyle()).to.be(null);
+      expect(layer.getStyleFunction()).to.be(undefined);
+    });
+
+    it('sets the default style when passing undefined', function() {
+      layer.setStyle(style);
+      layer.setStyle(undefined);
+      expect(layer.getStyle()).to.be(ol.style.defaultStyleFunction);
+      expect(layer.getStyleFunction()).to.be(ol.style.defaultStyleFunction);
+    });
+
   });
 
   describe('#getStyle()', function() {