Web Reference: Scopes can watch expressions and propagate events. Scopes provide APIs ($watch) to observe model mutations. Scopes provide APIs ($apply) to propagate any model changes through the system into the view from outside of the "AngularJS realm" (controllers, services, AngularJS event handlers). Feb 27, 2013 · Whatever code has access to a scope – normally controllers and directives (their link functions and/or their controllers) – can set up a "watchExpression" that AngularJS will evaluate against that scope. How do I use $scope.$watch and $scope.$apply in AngularJS? AngularJS provides powerful mechanisms to observe and react to data changes within your application. Two of the most important tools for this are $scope.$watch and $scope.$apply.
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