Added a clearCache method to clear the render cache

docs/api.md

@@ -195,6 +195,10 @@ var selectize = $select[0].selectize;
 		<td valign="top"><code>isFull()</code></td>
 		<td valign="top">Returns whether or not the user can select more items.</td>
 	</tr>
+	<tr>
+		<td valign="top"><code>clearCache(template)</code></td>
+		<td valign="top">Clears the render cache. Takes an optional template argument (e.g. "option", "item") to clear only that cache.</td>
+	</tr>
 </table>
 
 ### Related Objects

src/selectize.js

@@ -1830,6 +1830,23 @@ $.extend(Selectize.prototype, {
 		}
 
 		return html;
+	}, 
+
+	/**
+	 * Clears the render cache for a template. If
+	 * no template is given, clears all render
+	 * caches.
+	 *
+	 * @param {string} templateName
+	 */
+	clearCache: function(templateName) {
+		var self = this;
+		if (typeof templateName === 'undefined') {
+			self.renderCache = {};
+		} else {
+			delete self.renderCache[templateName];
+		}
 	}
 
+
 });

test/api.js

@@ -567,6 +567,41 @@
 			});
 		});
 
+		describe('clearCache()', function() {
+			var test;
+
+			before(function() {
+				test = setup_test('<select multiple>', {
+					valueField: 'value',
+					labelField: 'value',
+					options: [
+						{value: 0},
+						{value: 1},
+						{value: 2},
+						{value: 3},
+					],
+					items: ['1','2','3']
+				});
+				test.selectize.advanceSelection(1);
+				test.selectize.refreshOptions(true);
+				test.selectize.refreshItems();
+			});
+			it('should clear the whole renderCache', function () {
+				expect($.isEmptyObject(test.selectize.renderCache)).to.be.equal(false);
+				test.selectize.clearCache();
+				expect($.isEmptyObject(test.selectize.renderCache)).to.be.equal(true);
+			});
+			it('should allow clearing just one template type from the renderCache', function () {
+				test.selectize.render('item', test.selectize.options[0]);
+				test.selectize.refreshOptions();
+				expect($.isEmptyObject(test.selectize.renderCache['option'])).to.be.equal(false);
+				expect($.isEmptyObject(test.selectize.renderCache['item'])).to.be.equal(false);
+				test.selectize.clearCache('option');
+				expect($.isEmptyObject(test.selectize.renderCache['option'])).to.be.equal(true);
+				expect($.isEmptyObject(test.selectize.renderCache['item'])).to.be.equal(false);
+			});
+		});
+
 	});
 
 })();