Unable to watch/observe scope? - angularjs

Question

<button-large color="green" click="createWorkstation()" busy="disableSave()" busyLabel="Saving...">Save</button-large>
I'm not able to watch changes to the output of disableSave(). The console.log()'s shown in my directive are never triggered when the output of .busy is changed. What am I doing wrong?
directive('buttonLarge', function () {
return {
scope: {
busy: '&',
click: '&'
},
replace: true,
restrict: 'E',
transclude: true,
template: '<button class="buttonL" ng-transclude/>',
link: function (scope, element, attrs) {
//when the button is busy, disable the button
if (angular.isDefined(scope.busy())) {
scope.$watch(scope.busy(), function () {
console.log('watched');
});
attrs.$observe(scope.busy(), function () {
console.log('observed');
});
}
//setup click event - https://groups.google.com/forum/#!topic/angular/-uVE5WJWwLA
if (angular.isDefined(scope.click)) {
element.bind('click', scope.click);
}
}
}
})
Controller
$scope.newWorkstationDialog = function (workflowProcess) {
var d = $dialog.
dialog({
resolve: {
workflowProcess: function () {
return workflowProcess;
}
}
}).
open('/partials/admin/'+workflowProcess.entity.slug+'/setup.htm', ['$scope', 'dialog', ..., function ($scope, dialog, ...) {
$scope.saving = false;
/* Create the workstation */
$scope.createWorkstation = function () {
console.log('saving');
$scope.saving = true;
$timeout(function () {
$scope.saving = false;
console.log('stopped saving');
}, 1000);
}
//Should the save button be disabled?
$scope.disableSave = function () {
return $scope.saving;//|| $scope.form.$valid;
}
$scope.cancel = function () {
dialog.close();
}
}]);
}

Answer 1

Your syntax of watching in not correct .You should be not using scope when doing watch because internally it use $parse service which internally attach scope . So you need to modify your code as below
1st option
scope.$watch(function(){
return scope.busy()
}, function (newvalue,oldvalue) {
console.log('watched');
});
2nd option
scope.$watch('busy()', function (newvalue,oldvalue) {
console.log('watched');
});