fix(input): listen on "change" for radio and checkbox

input[radio] and inout[checkbox] now listen on the change event instead
of the click event. This fixes issue with 3rd party libraries that trigger
a change event on inputs, e.g. Bootstrap 3 custom checkbox / radio button
toggles.
It also makes it easier to prevent specific events that can cause a checkbox / radio
to change, e.g. click events. Previously, this was difficult because the custom click
handler had to be registered before the input directive's click handler.

It is possible that radio and checkbox listened to click because IE8 has
broken support for listening on change, see http://www.quirksmode.org/dom/events/change.html

Closes angular#4516
Closes angular#14667

BREAKING CHANGE:

input[radio] and input[checkbox] now need to be attached to the document to propagate events
correctly. This should only be of concern in unit-tests that compile input elements and
trigger click events on them. This is because we now listen to the change event which
gets automatically triggered by browsers when a checkbox or radio is clicked. However,
this may fail in some browsers when the elements are not attached to the document.

Before:

```js
    it('should update the model', inject(function($compile, $rootScope) {
      var inputElm = $compile('<input type="checkbox" ng-model="checkbox" />')($rootScope);

      browserTrigger(inputElm[0], 'click');
      expect($rootScope.checkbox).toBe(true);
    });
```

With this patch, `$rootScope.checkbox` might not be true, because the click event
hasn't triggered the change event. To make the test, work append the inputElm to the app's
$rootElement, and the $rootElement to the $document:

After:

```js
    it('should update the model', inject(function($compile, $rootScope, $rootElement, $document) {
      var inputElm = $compile('<input type="checkbox" ng-model="checkbox" />')($rootScope);

      $rootElement.append(inputElm);
      $document.append($rootElement);

      browserTrigger(inputElm[0], 'click');
      expect($rootScope.checkbox).toBe(true);
    });
```

src/ng/directive/input.js

@@ -1472,7 +1472,7 @@ function radioInputType(scope, element, attr, ctrl) {
     }
   };
 
-  element.on('click', listener);
+  element.on('change', listener);
 
   ctrl.$render = function() {
     var value = attr.value;
@@ -1505,7 +1505,7 @@ function checkboxInputType(scope, element, attr, ctrl, $sniffer, $browser, $filt
     ctrl.$setViewValue(element[0].checked, ev && ev.type);
   };
 
-  element.on('click', listener);
+  element.on('change', listener);
 
   ctrl.$render = function() {
     element[0].checked = ctrl.$viewValue;

test/helpers/testabilityPatch.js

@@ -359,7 +359,7 @@ function generateInputCompilerHelper(helper) {
         };
       });
     });
-    inject(function($compile, $rootScope, $sniffer) {
+    inject(function($compile, $rootScope, $sniffer, $document, $rootElement) {
 
       helper.compileInput = function(inputHtml, mockValidity, scope) {
 
@@ -381,6 +381,9 @@ function generateInputCompilerHelper(helper) {
         // Compile the lot and return the input element
         $compile(helper.formElm)(scope);
 
+        $rootElement.append(helper.formElm);
+        jqLite($document[0].body).append($rootElement);
+
         spyOn(scope.form, '$addControl').and.callThrough();
         spyOn(scope.form, '$$renameControl').and.callThrough();
 

test/ng/directive/inputSpec.js

@@ -2932,7 +2932,7 @@ describe('input', function() {
 
   describe('radio', function() {
 
-    it('should update the model', function() {
+    they('should update the model on $prop event', ['click', 'change'], function(event) {
       var inputElm = helper.compileInput(
           '<input type="radio" ng-model="color" value="white" />' +
           '<input type="radio" ng-model="color" value="red" />' +
@@ -2948,7 +2948,8 @@ describe('input', function() {
       expect(inputElm[1].checked).toBe(true);
       expect(inputElm[2].checked).toBe(false);
 
-      browserTrigger(inputElm[2], 'click');
+      if (event === 'change') inputElm[2].checked = true;
+      browserTrigger(inputElm[2], event);
       expect($rootScope.color).toBe('blue');
     });
 
@@ -3005,6 +3006,23 @@ describe('input', function() {
     });
 
 
+    they('should update the model on $prop event', ['click', 'change'], function(event) {
+      var inputElm = helper.compileInput('<input type="checkbox" ng-model="checkbox" />');
+
+      expect(inputElm[0].checked).toBe(false);
+
+      $rootScope.$apply("checkbox = true");
+      expect(inputElm[0].checked).toBe(true);
+
+      $rootScope.$apply("checkbox = false");
+      expect(inputElm[0].checked).toBe(false);
+
+      if (event === 'change') inputElm[0].checked = true;
+      browserTrigger(inputElm[0], event);
+      expect($rootScope.checkbox).toBe(true);
+    });
+
+
     it('should format booleans', function() {
       var inputElm = helper.compileInput('<input type="checkbox" ng-model="name" />');