fix(input): prevent double $digest when using jQuery trigger.

If an event was performed natively, jQuery sets the isTrigger property.
When triggering event manually, the field is not present. Manually
triggered events are performed synchronously which causes the "$digest
already in progress" error.

Closes #5293

3 files changed, 30 insertions, 4 deletions

diff --git a/src/ng/directive/input.js b/src/ng/directive/input.js
index 6a974d9d..c280b7c2 100644
--- a/src/ng/directive/input.js
+++ b/src/ng/directive/input.js
@@ -407,7 +407,7 @@ function textInputType(scope, element, attr, ctrl, $sniffer, $browser) {
     });
   }
 
-  var listener = function() {
+  var listener = function(ev) {
     if (composing) return;
     var value = element.val();
 
@@ -419,9 +419,17 @@ function textInputType(scope, element, attr, ctrl, $sniffer, $browser) {
     }
 
     if (ctrl.$viewValue !== value) {
-      scope.$apply(function() {
+      // If an event was performed natively, jQuery sets the isTrigger property.
+      // When triggering event manually, the field is not present. Manually
+      // triggered events are performed synchronously which causes the "$digest
+      // already in progress" error.
+      if (ev && ev.isTrigger) {
         ctrl.$setViewValue(value);
-      });
+      } else {
+        scope.$apply(function() {
+          ctrl.$setViewValue(value);
+        });
+      }
     }
   };
 
diff --git a/src/ngScenario/Scenario.js b/src/ngScenario/Scenario.js
index 9a30d8a9..f323e01d 100644
--- a/src/ngScenario/Scenario.js
+++ b/src/ngScenario/Scenario.js
@@ -239,7 +239,8 @@ function callerFile(offset) {
  * To work around this we instead use our own handler that fires a real event.
  */
 (function(fn){
-  var parentTrigger = fn.trigger;
+  // We need a handle to the original trigger function for input tests.
+  var parentTrigger = fn._originalTrigger = fn.trigger;
   fn.trigger = function(type) {
     if (/(click|change|keydown|blur|input|mousedown|mouseup)/.test(type)) {
       var processDefaults = [];
diff --git a/test/ng/directive/inputSpec.js b/test/ng/directive/inputSpec.js
index 48319cfa..c9a345cd 100644
--- a/test/ng/directive/inputSpec.js
+++ b/test/ng/directive/inputSpec.js
@@ -533,6 +533,23 @@ describe('input', function() {
       'event so that form auto complete works',function() {
       assertBrowserSupportsChangeEvent(true);
     });
+
+    if (!_jqLiteMode) {
+      it('should not cause the double $digest when triggering an event using jQuery', function() {
+        $sniffer.hasEvent = function(eventName) {
+          return eventName !== 'input';
+        };
+
+        compileInput('<input type="text" ng-model="name" name="alias" ng-change="change()" />');
+
+        scope.field = 'fake field';
+        scope.$watch('field', function() {
+          // We need to use _originalTrigger since trigger is modified by Angular Scenario.
+          inputElm._originalTrigger('change');
+        });
+        scope.$apply();
+      });
+    }
   });
 
   describe('"paste" and "cut" events', function() {