AngularJS

Advantages of using Angular.js as framework are:

► Supports two way data-binding

► Supports MVC pattern

► Support static template and angular template

► Can add custom directive

► Supports REST full services

► Supports form validations

► Support both client and server communication

► Support dependency injection

► Applying Animations

► Event Handlers

DI or Dependency Injection is a software design pattern that deals with how code gets hold of its dependencies. In order to retrieve elements of the application which is required to be configured when module gets loaded , the operation "config" uses dependency injection.

► To observer model mutations scopes provide APIs ($watch).

► To propagate any model changes through the system into the view from outside of the Angular realm.

► A scope inherits properties from its parent scope, while providing access to shared model properties, scopes can be nested to isolate application components.

► Scope provides context against which expressions are evaluated.

2009

These are the ways that object uses to hold of its dependencies

► Typically using the new operator, dependency can be created.

► By referring to a global variable, dependency can be looked up.

► Dependency can be passed into where it is required.

Each angular application consist of one root scope but may have several child scopes. As child controllers and some directives create new child scopes, application can have multiple scopes. When new scopes are formed or created they are added as a children of their parent scope. Similar to DOM, they also creates a hierarchical structure.

javaScript

To initialize the Angular Application data.

ngModel adds these CSS classes to allow styling of form as well as control:

► ng- valid

► ng- invalid

► ng-pristine

► ng-dirty

October 31, 2014

It is used for template DOM Manipulation and collect all of the directives.

Post linking function is executed after the child elements are linked. It is safe to do DOM transformation by post-linking function.

For creating the directive, factory method is used. It is invoked only once, when compiler matches the directive for the first time. By using $injector.invoke the factory method is invoked.

Pre-linking function is executed before the child elements are linked. It is not considered as the safe way for DOM transformation.

Link combines the directives with a scope and produce a live view. For registering DOM listeners as well as updating the DOM, link function is responsible. After the template is cloned it is executed.

In angular.js the compiler during the compilation process matches text and attributes using interpolate service to see if they contains embedded expressions. As part of normal digest cycle these expressions are updated and registered as watches.

With angular.js you can bootstrap your app easily using services, which auto-injected into your application in Guice like dependency injection style.

It is used for registering DOM listeners as well as instance DOM manipulation. It is executed once the template has been cloned.

Angular.js helps to eliminate almost all of the boiler plate like validating the form, displaying validation errors, returning to an internal model and so on which occurs due to flow of marshalling data.

All the application that are created using Angular never have to manipulate the DOM although it can be done if it is required.