active api to return current number of toasts

Closes #142

Author: timbell

src/toastr.js

@@ -17,6 +17,7 @@
     var containerDefer = $q.defer();
 
     var toast = {
+      active: active,
       clear: clear,
       error: error,
       info: info,
@@ -28,6 +29,10 @@
     return toast;
 
     /* Public API */
+    function active() {
+      return toasts.length;
+    }
+
     function clear(toast) {
       // Bit of a hack, I will remove this soon with a BC
       if (arguments.length === 1 && !toast) { return; }

test/toastr_spec.js

@@ -372,6 +372,17 @@ describe('toastr', function() {
       animationFlush();
       expect($document).not.toHaveToastContainer();
     });
+
+    it('has a list of active toasts', function() {
+      openToasts(5);
+      expect(toastr.active()).toBe(5);
+      clickToast();
+      clickToast();
+      expect(toastr.active()).toBe(3);
+      intervalFlush();
+      animationFlush();
+      expect(toastr.active()).toBe(0);
+    });
   });
 
   describe('container', function() {