Angularjs Training in US & Canada

The key features of AngularJS are – Scope, Controller, Model, View, Services, Data Binding, Directives, Filters and Testable

Like JavaScript, Angular expressions are code snippets that are usually placed in binding such as {{ expression }}

The key difference between the JavaScript expressions and Angular expressions are:

• In Angular, the expressions are evaluated against a scope object, while the Javascript expressions are evaluated against the global window.
• In Angular expression evaluation is forgiving to null and undefined, while in Javascript undefined properties generates TypeError or ReferenceError.
• Loops, conditionals or exceptions cannot be used in an angular expression
• To format data before displaying it you can use filters in angular expression

Scope refers to the application model. It can watch expressions and propagate events. It acts like glue between application controller and the view.

In AngularJS, services are the singleton objects or functions that are used for carrying out specific tasks. It holds some business logic and these function can be called as controllers, directive, filters and so on.

• Element directives
• Attribute directives
• CSS class directives
• Comment directives

ngJq, ngApp, ngHref, ngSrc, ngDisabled, ngChecked, ngValue, ngSelected etc.

An injector is a service locator, used to retrieve object instances.