How do I create a component in angular 2?

Let's break each step down so we can get a full understanding of how Angular 2 uses components.

1. Step 1: Import the Component Object. import { Component } from '@angular/core'
2. Step 2: Add Meta-data to our Component using TypeScript Decorators.
3. Step 3: Export the Component.
4. Step 4: bootstrap our Component.

Hereof, how do you create a component in angular 2 using command?

Creating Components

1. The CLI can scaffold Angular components through the generate command. To create a new component run:
2. ng generate component [component-name]
3. Executing the command creates a folder, [component-name], in the project's src/app path or the current path the command is executed in if it's a child folder of the project.

Also Know, what are the key components of angular? Angular JS key components are :

• Template − This is used to render the view for the application.
• Class − This is like a class defined in any language such as C.
• Metadata − This has the extra data defined for the Angular class.
• app.component.css.
• app.component.html.
• app.component.spec.ts.
• app.component.ts.
• app.module.ts.

Furthermore, what is a component in angular 2?

A component is a main building block of an Angular 2 application, and an application may have any number of components. We can consider a component a particular view of the application with its own logic and data. In Angular 2, components perform all the tasks that were performed by controllers, scopes and directives.

What is module in angular?

In Angular, a module is a mechanism to group components, directives, pipes and services that are related, in such a way that can be combined with other modules to create an application. An Angular application can be thought of as a puzzle where each piece (or each module) is needed to be able to see the full picture.

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 directive in angular?

At the core, a directive is a function that executes whenever the Angular compiler finds it in the DOM. Angular directives are used to extend the power of the HTML by giving it new syntax. Each directive has a name — either one from the Angular predefined like ng-repeat , or a custom one which can be called anything.

What is child component in angular?

Components Relationship Angular is built up of many components. There is a root component that serves as the parent component, every other components can be called a Child Component to the root component since the root component is the Parent Component.

What is the angular CLI?

Angular CLI is a command-line interface (CLI) to automate your development workflow. It allows you to: create a new Angular application. run a development server with LiveReload support to preview your application during development.

What is app component HTML?

Components are basically classes that interact with the .html file of the component, which gets displayed on the browser. We have seen the file structure in one of our previous chapters. The file structure has the app component and it consists of the following files − app.component.css.

How does angular implement routing?

To enable routing in our Angular application, we need to do three things:

1. create a routing configuration that defines the possible states for our application.
2. import the routing configuration into our application.
3. add a router outlet to tell Angular Router where to place the activated components in the DOM.

What is app component Ts in angular?

AppComponent is the root component of our application. It's the base of the tree of components of our application and it's the first component that gets inserted in the browser DOM. Read The [bootstrap](https://angular.io/guide/bootstrapping#the-bootstrap-array) array.

What is lazy loading in angular?

Lazy Loading generally, is a concept where we delay loading of an object until it is needed. In Angular, all the JavaScript components declared in the declarations array app. module. ts are bundled and loaded in one fell swoop when a user visits our site.

What is a template in angular?

Templates in AngularJS are simply an HTML file filled or enriched with AngularJS stuff like attributes and directives. A directive is a marker element that is used to target a particular attribute or class to render its behavior as according to the needs.

What is a selector in angular?

The selector is a property inside the angular component which identifies the directive in a template and triggers instantiation of the directive. The selector has to be unique so that it doesn't override already existing element or component available by a number of third-party packages.

What is lifecycle hooks in angular?

Lifecycle Hooks in Angular. Angular gives us 8 hooks to allow us to tap into the lifecycle of our components and trigger actions at specific points in the lifecycle. ngDoCheck: Use this hook instead of ngOnChanges for changes that Angular doesn't detect.

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 a 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 a component why would you use it?

Components provide the data and logic that will be used by the data bindings that are applied to the HTML elements in the template, which provide the context used to evaluate data binding expressions and act as the glue between the directives and the rest of the application.

Is angular 2 Object Oriented?

Angular 2 is a free and open source JavaScript framework built by Google . It's a superset of JavaScript,that favors an object oriented and strongly typed approach ,built by Microsoft . If you are familiar with OOP concepts and OOP languages such Java or C++ you should have no problem learning/using TypeScript .

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.

What does ng generate component do?

ng generate component Specifies if the style will be in the ts file. The file extension to be used for style files. spec. --spec. Specifies if a spec file is generated.