The $scope.$watch function is not triggering events within a controller of a ui.bootstrap.modal

Currently, I am utilizing UI bootstrap for Angular and have successfully integrated the ui.bootstrap.modal component into my project. Everything seems to be working smoothly except for one issue I am encountering. Despite setting up a $scope.$watch to track changes on a specific property in the modal's controller, it is not triggering when the property is modified.

You can view a reproduction of this problem on this plunkr link.

Upon observation, the $watch function only fires once when the modal is opened but fails to respond to any changes made to the checkbox value within the UI. The binding seems correct initially as modifying one checkbox automatically updates the other (both linked to the same property).

If you have any insights or suggestions regarding this matter, they would be greatly appreciated!

Answer №1

Learn about Angular $watch statements as they are triggered at least once to establish the connection

Once a watcher is added to the scope, the listener function is executed asynchronously (via $evalAsync) for the initial setup of the watcher. In some rare instances, this may not be desirable because the listener is invoked even when the result of watchExpression remains unchanged. To handle this situation within the listener function, you can compare the newVal and oldVal. If these values are identical (===), then the listener was called during initialization.

You might receive an alert during the setup process, but if nothing seems to be connected, it could be due to Angular's constraints related to prototypal inheritance and primitives. By modifying it like $scope.form = {}; and accessing it as form.chkVariable, it should behave as anticipated.

Visit this link to see an example

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