How does data binding work in AngularJS?

Question

How does data binding work in the AngularJS framework?

I haven\'t found technical details on their site. It\'s more or less clear how it works when data

Answer 1

This is my basic understanding. It may well be wrong!

1. Items are watched by passing a function (returning the thing to be watched) to the $watch method.
2. Changes to watched items must be made within a block of code wrapped by the $apply method.
3. At the end of the $apply the $digest method is invoked which goes through each of the watches and checks to see if they changed since last time the $digest ran.
4. If any changes are found then the digest is invoked again until all changes stabilize.

In normal development, data-binding syntax in the HTML tells the AngularJS compiler to create the watches for you and controller methods are run inside $apply already. So to the application developer it is all transparent.