Data binding refers to the process that is used for establishing a connection between the application UI and business logic. The Two-way data binding point towards the ability of binding changes with an object’s properties to changes in the UI and vice-versa. It means if we have a user object with a name property, when we assign a new value to user.name the UI will display the new name. Similarly, if an input field is included in UI for the username then the entering of value will result in a change in the name property of the user object.
- We require a way to specify which UI elements are bound to which properties
- We are supposed to monitor changes on the properties and UI elements
- We have to propagate any change to all bound objects and elements
Implementation using Angular JS
AngularJS remembers the value and does a comparison with the previous value. This is a basic checking. When there will be a change of value then change event is fired.
The $apply() method, that is called during transitioning from a non-AngularJS world into an AngularJS world will calls $digest(). The digest is simple and old trick for checking. It smoothly works on all browsers and is very predictable.
Unlike dirty-checking (AngularJS) vs change listeners (KnockoutJS and Backbone.js): While dirty-checking might look simple as well as a bit inefficient. It turns out that it is semantically correct all the time whereas change listeners have multiple mismanaged corner cases and require things like dependency tracking to make it more semantically correct. KnockoutJS dependency tracking is a good feature for a problem which AngularJS is missing.
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