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NgModule in Angular 2

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[前端(javascript) 所属分类 前端(javascript) | 发布者 店小二04 | 时间 2017 | 作者 红领巾 ] 0人收藏点击收藏

Angular 2 applications are designed for better application organization.Two of the main concepts related to organization of code in Angular 2 are components and modules.Both Components and modules are created by using the decorator functions.NgModule in Angular 2 is used to create a module.

Here we will see how to implement a simple module in Angular 2.

To create Angular 2 module we use the decorator function @NgModule().To this function we pass metadata information in the form of a metadata object.

Following are the main steps to implement a simple module in Angular 2 application

1.Import the NgModule which is required to create a new module

import { NgModule } from [emailprotected] /core';

2. Declare a new class.This is the class which will represent our module.

export class AppModule{ }

We have named our class as AppModule since it represents the root module in our application.

3.Decorate this class with[emailprotected]

() decorator function,

@NgModule({ }) export class AppModule{ }

4.Add the metadata in the @NgModule().Here we are adding bootstrap.This metadata represents the bootstrap component.

@NgModule({ bootstrap: [ AppComponent ] })

If required we can include import declarations in the @NgModule decorator function as:

@NgModule({ bootstrap:[ AppComponent ], imports: [ // put all your modules here BrowserModule, // Angular 2 out of the box modules TranslateModule, // some third party modules / libraries ] })

The above decorator specifies AppComponent in the bootstrap property.What this means is that there is a component called AppComponent which will launch our application.

There is AppComponent in App inapp.module.ts file.

In theapp.module.ts we launch the application by calling thebootstrapModule() function.

//app.module.ts platformBrowserDynamic().bootstrapModule(AppModule);

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