feat(ngModel): update model on each key stroke (revert ngModelInstant)

It turns out that listening only on "blur" event is not sufficient in many scenarios,
especially when you use form validation you always had to use ngModelnstant
e.g. if you want to disable a button based on valid/invalid form.

The feedback we got from our apps as well as external apps is that the
ngModelInstant should be the default.

In the future we might provide alternative ways of suppressing updates
on each key stroke, but it's not going to be the default behavior.

Apps already using the ngModelInstant can safely remove it from their
templates. Input fields without ngModelInstant directive will start propagating
the input changes into the model on each key stroke.

docs/content/guide/dev_guide.forms.ngdoc

@@ -20,7 +20,7 @@ In addition it provides {@link api/angular.module.ng.$compileProvider.directive.
 <doc:source>
 <div ng-controller="Controller">
   <form novalidate class="simple-form">
-    Name: <input type="text" ng-model="user.name" ng-model-instant /><br />
+    Name: <input type="text" ng-model="user.name" /><br />
     E-mail: <input type="email" ng-model="user.email" /><br />
     Gender: <input type="radio" ng-model="user.gender" value="male" />male
     <input type="radio" ng-model="user.gender" value="female" />female<br />
@@ -50,11 +50,7 @@ In addition it provides {@link api/angular.module.ng.$compileProvider.directive.
 </doc:example>
 
 
-Note that:
-
-  * the {@link api/angular.module.ng.$compileProvider.directive.ng-model-instant ng-model-instant} causes the `user.name` to be updated immediately.
-
-  * `novalidate` is used to disable browser's native form validation.
+Note that `novalidate` is used to disable browser's native form validation.
 
 
 
@@ -76,7 +72,7 @@ This ensures that the user is not distracted with an error until after interacti
 <div ng-controller="Controller">
   <form novalidate class="css-form">
     Name:
-      <input type="text" ng-model="user.name" ng-model-instant required /><br />
+      <input type="text" ng-model="user.name" required /><br />
     E-mail: <input type="email" ng-model="user.email" required /><br />
     Gender: <input type="radio" ng-model="user.gender" value="male" />male
     <input type="radio" ng-model="user.gender" value="female" />female<br />
@@ -147,7 +143,7 @@ This allows us to extend the above example with these features:
 
     <input type="checkbox" ng-model="user.agree" name="userAgree" required />
     I agree: <input ng-show="user.agree" type="text" ng-model="user.agreeSign"
-              ng-model-instant required /><br />
+              required /><br />
     <div ng-show="!user.agree || !user.agreeSign">Please agree and sign.</div>
 
     <button ng-click="reset()" disabled="{{isUnchanged(user)}}">RESET</button>

src/AngularPublic.js

@@ -98,7 +98,6 @@ function publishExternalAPI(angular){
             ngModel: ngModelDirective,
             ngList: ngListDirective,
             ngChange: ngChangeDirective,
-            ngModelInstant: ngModelInstantDirective,
             required: requiredDirective,
             ngRequired: requiredDirective,
             ngValue: ngValueDirective

src/ng/directive/input.js

@@ -367,12 +367,43 @@ function isEmpty(value) {
 }
 
 
-function textInputType(scope, element, attr, ctrl) {
-  element.bind('blur', function() {
-    scope.$apply(function() {
-      ctrl.$setViewValue(trim(element.val()));
+function textInputType(scope, element, attr, ctrl, $sniffer, $browser) {
+
+  var listener = function() {
+    var value = trim(element.val());
+
+    if (ctrl.$viewValue !== value) {
+      scope.$apply(function() {
+        ctrl.$setViewValue(value);
+      });
+    }
+  };
+
+  // if the browser does support "input" event, we are fine
+  if ($sniffer.hasEvent('input')) {
+    element.bind('input', listener);
+  } else {
+    var timeout;
+
+    element.bind('keydown', function(event) {
+      var key = event.keyCode;
+
+      // ignore
+      //    command            modifiers                   arrows
+      if (key === 91 || (15 < key && key < 19) || (37 <= key && key <= 40)) return;
+
+      if (!timeout) {
+        timeout = $browser.defer(function() {
+          listener();
+          timeout = null;
+        });
+      }
     });
-  });
+
+    // if user paste into input using mouse, we need "change" event to catch it
+    element.bind('change', listener);
+  }
+
 
   ctrl.$render = function() {
     element.val(isEmpty(ctrl.$viewValue) ? '' : ctrl.$viewValue);
@@ -448,8 +479,8 @@ function textInputType(scope, element, attr, ctrl) {
   }
 };
 
-function numberInputType(scope, element, attr, ctrl) {
-  textInputType(scope, element, attr, ctrl);
+function numberInputType(scope, element, attr, ctrl, $sniffer, $browser) {
+  textInputType(scope, element, attr, ctrl, $sniffer, $browser);
 
   ctrl.$parsers.push(function(value) {
     var empty = isEmpty(value);
@@ -510,8 +541,8 @@ function numberInputType(scope, element, attr, ctrl) {
   });
 }
 
-function urlInputType(scope, element, attr, ctrl) {
-  textInputType(scope, element, attr, ctrl);
+function urlInputType(scope, element, attr, ctrl, $sniffer, $browser) {
+  textInputType(scope, element, attr, ctrl, $sniffer, $browser);
 
   var urlValidator = function(value) {
     if (isEmpty(value) || URL_REGEXP.test(value)) {
@@ -527,8 +558,8 @@ function urlInputType(scope, element, attr, ctrl) {
   ctrl.$parsers.push(urlValidator);
 }
 
-function emailInputType(scope, element, attr, ctrl) {
-  textInputType(scope, element, attr, ctrl);
+function emailInputType(scope, element, attr, ctrl, $sniffer, $browser) {
+  textInputType(scope, element, attr, ctrl, $sniffer, $browser);
 
   var emailValidator = function(value) {
     if (isEmpty(value) || EMAIL_REGEXP.test(value)) {
@@ -709,13 +740,14 @@ function checkboxInputType(scope, element, attr, ctrl) {
       </doc:scenario>
     </doc:example>
  */
-var inputDirective = [function() {
+var inputDirective = ['$browser', '$sniffer', function($browser, $sniffer) {
   return {
     restrict: 'E',
     require: '?ngModel',
     link: function(scope, element, attr, ctrl) {
       if (ctrl) {
-        (inputType[lowercase(attr.type)] || inputType.text)(scope, element, attr, ctrl);
+        (inputType[lowercase(attr.type)] || inputType.text)(scope, element, attr, ctrl, $sniffer,
+                                                            $browser);
       }
     }
   };
@@ -1004,69 +1036,6 @@ var ngChangeDirective = valueFn({
 });
 
 
-/**
- * @ngdoc directive
- * @name angular.module.ng.$compileProvider.directive.ng-model-instant
- *
- * @element input
- *
- * @description
- * By default, Angular udpates the model only on `blur` event - when the input looses focus.
- * If you want to update after every key stroke, use `ng-model-instant`.
- *
- * @example
- * <doc:example>
- *   <doc:source>
- *     First name: <input type="text" ng-model="firstName" /><br />
- *     Last name: <input type="text" ng-model="lastName" ng-model-instant /><br />
- *
- *     First name ({{firstName}}) is only updated on `blur` event, but the last name ({{lastName}})
- *     is updated immediately, because of using `ng-model-instant`.
- *   </doc:source>
- *   <doc:scenario>
- *     it('should update first name on blur', function() {
- *       input('firstName').enter('santa', 'blur');
- *       expect(binding('firstName')).toEqual('santa');
- *     });
- *
- *     it('should update last name immediately', function() {
- *       input('lastName').enter('santa', 'keydown');
- *       expect(binding('lastName')).toEqual('santa');
- *     });
- *   </doc:scenario>
- * </doc:example>
- */
-var ngModelInstantDirective = ['$browser', function($browser) {
-  return {
-    require: 'ngModel',
-    link: function(scope, element, attr, ctrl) {
-      var handler = function() {
-        scope.$apply(function() {
-          ctrl.$setViewValue(trim(element.val()));
-        });
-      };
-
-      var timeout;
-      element.bind('keydown', function(event) {
-        var key = event.keyCode;
-
-        //    command            modifiers                   arrows
-        if (key === 91 || (15 < key && key < 19) || (37 <= key && key <= 40)) return;
-
-        if (!timeout) {
-          timeout = $browser.defer(function() {
-            handler();
-            timeout = null;
-          });
-        }
-      });
-
-      element.bind('change input', handler);
-    }
-  };
-}];
-
-
 var requiredDirective = [function() {
   return {
     require: '?ngModel',

src/ngScenario/Scenario.js

@@ -327,7 +327,7 @@ function browserTrigger(element, type, keys) {
 (function(fn){
   var parentTrigger = fn.trigger;
   fn.trigger = function(type) {
-    if (/(click|change|keydown|blur)/.test(type)) {
+    if (/(click|change|keydown|blur|input)/.test(type)) {
       var processDefaults = [];
       this.each(function(index, node) {
         processDefaults.push(browserTrigger(node, type));

src/ngScenario/dsl.js

@@ -198,12 +198,13 @@ angular.scenario.dsl('binding', function() {
  */
 angular.scenario.dsl('input', function() {
   var chain = {};
+  var supportInputEvent = 'oninput' in document.createElement('div');
 
   chain.enter = function(value, event) {
     return this.addFutureAction("input '" + this.name + "' enter '" + value + "'", function($window, $document, done) {
       var input = $document.elements('[ng\\:model="$1"]', this.name).filter(':input');
       input.val(value);
-      input.trigger(event || 'blur');
+      input.trigger(event || supportInputEvent && 'input' || 'change');
       done();
     });
   };

test/BinderSpec.js

@@ -142,20 +142,6 @@ describe('Binder', function() {
     expect(html.indexOf('action="foo();"')).toBeGreaterThan(0);
   });
 
-  it('RepeaterAdd', inject(function($rootScope, $compile) {
-    element = $compile('<div><input type="text" ng-model="item.x" ng-repeat="item in items"></div>')($rootScope);
-    $rootScope.items = [{x:'a'}, {x:'b'}];
-    $rootScope.$apply();
-    var first = childNode(element, 1);
-    var second = childNode(element, 2);
-    expect(first.val()).toEqual('a');
-    expect(second.val()).toEqual('b');
-
-    first.val('ABC');
-    browserTrigger(first, 'blur');
-    expect($rootScope.items[0].x).toEqual('ABC');
-  }));
-
   it('ItShouldRemoveExtraChildrenWhenIteratingOverHash', inject(function($rootScope, $compile) {
     element = $compile('<div><div ng-repeat="i in items">{{i}}</div></div>')($rootScope);
     var items = {};

test/ng/directive/formSpec.js

@@ -1,7 +1,7 @@
 'use strict';
 
 describe('form', function() {
-  var doc, control, scope, $compile;
+  var doc, control, scope, $compile, changeInputValue;
 
   beforeEach(module(function($compileProvider) {
     $compileProvider.directive('storeModelCtrl', function() {
@@ -14,9 +14,14 @@ describe('form', function() {
     });
   }));
 
-  beforeEach(inject(function($injector) {
+  beforeEach(inject(function($injector, $sniffer) {
     $compile = $injector.get('$compile');
     scope = $injector.get('$rootScope');
+
+    changeInputValue = function(elm, value) {
+      elm.val(value);
+      browserTrigger(elm, $sniffer.hasEvent('input') ? 'input' : 'change');
+    };
   }));
 
   afterEach(function() {
@@ -126,10 +131,8 @@ describe('form', function() {
     var inputA = doc.find('input').eq(0),
         inputB = doc.find('input').eq(1);
 
-    inputA.val('val1');
-    browserTrigger(inputA, 'blur');
-    inputB.val('val2');
-    browserTrigger(inputB, 'blur');
+    changeInputValue(inputA, 'val1');
+    changeInputValue(inputB, 'val2');
 
     expect(scope.firstName).toBe('val1');
     expect(scope.lastName).toBe('val2');