fix(ngModel): use keydown/change events on IE9 instead of input

On IE9 the input event is not fired when backspace or delete key are pressed or when
cut is performed. This makes listening on the input event unreliable and therefore
it's better for us to just use keydown/change events instead.

Closes #879

src/ng/directive/input.js

@@ -379,7 +379,8 @@ function textInputType(scope, element, attr, ctrl, $sniffer, $browser) {
     }
   };
 
-  // if the browser does support "input" event, we are fine
+  // if the browser does support "input" event, we are fine - except on IE9 which doesn't fire the
+  // input event on backspace, delete or cut
   if ($sniffer.hasEvent('input')) {
     element.bind('input', listener);
   } else {

src/ng/sniffer.js

@@ -22,6 +22,11 @@ function $SnifferProvider() {
                   // IE8 compatible mode lies
                   (!$window.document.documentMode || $window.document.documentMode > 7),
       hasEvent: function(event) {
+        // IE9 implements 'input' event it's so fubared that we rather pretend that it doesn't have
+        // it. In particular the event is not fired when backspace or delete key are pressed or
+        // when cut operation is performed.
+        if (event == 'input' && msie == 9) return false;
+
         if (isUndefined(eventSupport[event])) {
           var divElm = $window.document.createElement('div');
           eventSupport[event] = 'on' + event in divElm;

test/ng/directive/inputSpec.js

@@ -254,7 +254,7 @@ describe('ngModel', function() {
     expect(element.hasClass('ng-invalid-email')).toBe(true);
 
     element.val('invalid-again');
-    browserTrigger(element, $sniffer.hasEvent('input') ? 'input' : 'change');
+    browserTrigger(element, ($sniffer.hasEvent('input')) ? 'input' : 'change');
     expect(element).toBeInvalid();
     expect(element).toBeDirty();
     expect(element.hasClass('ng-valid-email')).toBe(false);

test/ng/snifferSpec.js

@@ -45,10 +45,10 @@ describe('$sniffer', function() {
     });
 
 
-    it('should return true if "oninput" is present in a div element', function() {
-      mockDivElement = {oninput: noop};
+    it('should return true if "onchange" is present in a div element', function() {
+      mockDivElement = {onchange: noop};
 
-      expect($sniffer.hasEvent('input')).toBe(true);
+      expect($sniffer.hasEvent('change')).toBe(true);
     });
 
 
@@ -62,11 +62,19 @@ describe('$sniffer', function() {
     it('should only create the element once', function() {
       mockDivElement = {};
 
-      $sniffer.hasEvent('input');
-      $sniffer.hasEvent('input');
-      $sniffer.hasEvent('input');
+      $sniffer.hasEvent('change');
+      $sniffer.hasEvent('change');
+      $sniffer.hasEvent('change');
 
       expect(mockDocument.createElement).toHaveBeenCalledOnce();
     });
+
+
+    it('should claim that IE9 doesn\'t have support for "oninput"', function() {
+      // IE9 implementation is fubared, so it's better to pretend that it doesn't have the support
+      mockDivElement = {oninput: noop};
+
+      expect($sniffer.hasEvent('input')).toBe((msie == 9) ? false : true);
+    });
   });
 });