Learning AngularJS

Using $watch to Track a Scope Variable

To add the capability to handle changes to scope values, you simply need to add a $watch to the variable in the scope using the $watch functionality built into AngularJS. The $watch function in the scope uses the following syntax:

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$watch(watchExpression, listener, [objectEquality])

The watchExpression is the expression in the scope to watch. This expression is called on every $digest() and will return the value that will be watched. The listener defines a function that will be called when the value of the watchExpression changes to a new value. The listener will not be called if the watchExpression is changed to the value it is already set to. The objectEquality is a Boolean ...