feat($sniffer): add hasEvent method for sniffing events

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1 files changed, 13 insertions, 3 deletions

diff --git a/src/ng/sniffer.js b/src/ng/sniffer.js
index eebb2903..3249b816 100644
--- a/src/ng/sniffer.js
+++ b/src/ng/sniffer.js
@@ -12,13 +12,23 @@
  * @description
  * This is very simple implementation of testing browser's features.
  */
-function $SnifferProvider(){
-  this.$get = ['$window', function($window){
+function $SnifferProvider() {
+  this.$get = ['$window', function($window) {
+    var eventSupport = {};
+
     return {
       history: !!($window.history && $window.history.pushState),
       hashchange: 'onhashchange' in $window &&
                   // IE8 compatible mode lies
-                  (!$window.document.documentMode || $window.document.documentMode > 7)
+                  (!$window.document.documentMode || $window.document.documentMode > 7),
+      hasEvent: function(event) {
+        if (isUndefined(eventSupport[event])) {
+          var divElm = $window.document.createElement('div');
+          eventSupport[event] = 'on' + event in divElm;
+        }
+
+        return eventSupport[event];
+      }
     };
   }];
 }