What is the use of BrowserModule in angular 2?

BrowserModule provides services that are essential to launch and run a browser app. BrowserModule also re-exports CommonModule from @angular/common , which means that components in the AppModule module also have access to the Angular directives every app needs, such as NgIf and NgFor .

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Then, what is the use of BrowserModule in angular?

BrowserModule – The browser module is imported from @angular/platform-browser and it is used when you want to run your application in a browser. CommonModule – The common module is imported from @angular/common and it is used when you want to use directives - NgIf, NgFor and so on.

Secondly, what is the purpose of NgModule? The purpose of a NgModule is to declare each thing you create in Angular, and group them together (like Java packages or PHP / C# namespaces).

Keeping this in consideration, what is the use of NgModule in angular 2?

NgModule aims to simplify the way you define and manage dependencies in your Angular 2 applications. Using @NgModule you can consolidate different components and services into cohesive blocks of functionality. "@NgModule simplifies the way you define and manage dependencies in your Angular 2 apps."

What is @NgModule in angular?

An NgModule is collection of metadata describing components, directives, services, pipes, etc. When you add these resources to the NgModule metadata, Angular creates a component factory, which is just an Angular class that churns out components.

Related Question Answers

What is NgModule?

@NgModule takes a metadata object that describes how to compile a component's template and how to create an injector at runtime. It identifies the module's own components, directives, and pipes, making some of them public, through the exports property, so that external components can use them.

What is Formsmodule?

Directive automatically applied to Angular form controls that sets CSS classes based on control status. This directive is solely used to display warnings when the deprecated ngForm selector is used. NgModel. NgModel. Creates a FormControl instance from a domain model and binds it to a form control element.

What is pipe in angular?

Pipes are a useful feature in Angular. They are a simple way to transform values in an Angular template. There are some built in pipes, but you can also build your own pipes. A pipe takes in a value or values and then returns a value.

What is the use of entryComponents?

The entryComponents array is used to define only components that are not found in html and created dynamically with ComponentFactoryResolver . Angular needs this hint to find them and compile. All other components should just be listed in the declarations array.

What is import in angular?

An import is what you put in the imports property of the @NgModule decorator. It enables an Angular module to use functionality that was defined in another Angular module. An export what you put is the exports property of the @NgModule decorator.

Can we import a module twice?

No problem! We can import the same module twice but Angular does not like modules with circular references. So do not let Module “X” import Module “Y” which already imports Module “X”. When four modules all import Module “X”, Angular estimate Module “X” once, the first time face it and does not do again.

What is common module in angular?

CommonModule. Exports all the basic Angular directives and pipes, such as NgIf , NgForOf , DecimalPipe , and so on. Re-exported by BrowserModule , which is included automatically in the root AppModule when you create a new app with the CLI new command.

What is service in angular?

Angular services are singleton objects which get instantiated only once during the lifetime of an application. The main objective of a service is to organize and share business logic, models, or data and functions with different components of an Angular application.

What is lazy loading in angular?

Lazy loading is a technique in Angular that allows you to load JavaScript components asynchronously when a specific route is activated. There are some good posts about lazy loading in angular, but I wanted to simplify it further.

What is Ng in angular?

Ng stands for aNGular. NG is a core module, and this module contains all the directives that comes built in with the AngularJS library file. ng prefix on your own directives in order to avoid possible name collisions in future versions of Angular. All these directives have prefix 'ng'

What is injector in angular?

$injector is used to retrieve object instances as defined by provider, instantiate types, invoke methods, and load modules. The following always holds true: var $injector = angular.

What is bootstrap module in angular?

An NgModule describes how the application parts fit together. Every application has at least one Angular module, the root module that you bootstrap to launch the application. By convention, it is usually called AppModule .

What is directives in angular?

Directives are markers on a DOM element that tell AngularJS to attach a specified behavior to that DOM element or even transform the DOM element and its children. In short, it extends the HTML. Most of the directives in AngularJS are starting with ng- where ng stands for Angular.

What is bootstrapping in angular?

Bootstrapping is a technique of initializing or loading our Angular application. let's walk through our code created in Create your First new Angular project and see what happens at each stage and how our AppComponent gets loaded and displays “app works!”.

What is decorator in angular?

Decorators are a design pattern that is used to separate modification or decoration of a class without modifying the original source code. In AngularJS, decorators are functions that allow a service, directive or filter to be modified prior to its usage.

What is export keyword in angular?

So to summarise the discussion, export keyword is used to make something available in other files whether it is a class or variables. And one more thing export keyword has nothing to do with Angular , it is the keyword available in JavaScript and Typescript for reusability among different files.

What is metadata in angular?

Metadata is a way of processing the class and a component called MyComponent will act as a class until we tell Angular that it's a component. User can use metadata to the class to tell Angular that MyComponent is a component. Metadata can be attached to TypeScript using a decorator.

How do NG models work?

The ng-model attribute is used for, Binding controls such as input, text area and selects in the view into the model. The ng-model attribute maintains the state of the control (By state, we mean that the control and the data is bound to be always kept in sync.

What is a module and what does it contain?

(1) In software, a module is a part of a program. Programs are composed of one or more independently developed modules that are not combined until the program is linked. A single module can contain one or several routines. (2) In hardware, a module is a self-contained component.