What is angular?
Angular is a platform and framework for building single-page client applications using HTML and TypeScript. It implements core and optional functionality as a set of TypeScript libraries that you import into your applications.
What are angular's main functionalities?
Component-based Architecture
Angular uses a component-based architecture where the application is divided into small, reusable components. Each component has its own HTML template, CSS styles, and TypeScript logic.
import { Component } from '@angular/core';
@Component({
selector: 'app-root',
template: `<h1>Hello, {{name}}!</h1>`,
styleUrls: ['./app.component.css']
})
export class AppComponent {
name = 'Angular';
}
Two-way Data Binding
Two-way data binding allows for automatic synchronization of data between the model and the view. This means that any changes in the model are reflected in the view and vice versa.
<input [(ngModel)]="name">
<p>Hello, {{name}}!</p>
Dependency Injection
Dependency Injection (DI) is a design pattern used to implement IoC (Inversion of Control). It allows a class to receive its dependencies from an external source rather than creating them itself. Angular's DI system makes it easy to manage dependencies and promote reusability.
import { Injectable } from '@angular/core';
@Injectable({
providedIn: 'root',
})
export class DataService {
getData() {
return ['data1', 'data2', 'data3'];
}
}
import { Component, OnInit } from '@angular/core';
import { DataService } from './data.service';
@Component({
selector: 'app-data',
template: `<ul><li *ngFor="let item of data">{{item}}</li></ul>`
})
export class DataComponent implements OnInit {
data: string[];
constructor(private dataService: DataService) {}
ngOnInit() {
this.data = this.dataService.getData();
}
}
Routing
Angular's Router enables navigation from one view to the next as users perform application tasks. It allows for defining routes and associating them with components, enabling deep linking and navigation.
import { NgModule } from '@angular/core';
import { RouterModule, Routes } from '@angular/router';
import { HomeComponent } from './home/home.component';
import { AboutComponent } from './about/about.component';
const routes: Routes = [
{ path: '', component: HomeComponent },
{ path: 'about', component: AboutComponent }
];
@NgModule({
imports: [RouterModule.forRoot(routes)],
exports: [RouterModule]
})
export class AppRoutingModule {}
// In app.module.ts
import { AppRoutingModule } from './app-routing.module';
@NgModule({
imports: [AppRoutingModule],
// other imports
})
export class AppModule {}
Other packages similar to angular
react
React is a JavaScript library for building user interfaces, maintained by Facebook. Unlike Angular, which is a full-fledged framework, React is a library that focuses on the view layer only. It uses a virtual DOM for efficient updates and is often paired with other libraries for state management and routing.
vue
Vue.js is a progressive JavaScript framework for building user interfaces. It is designed to be incrementally adoptable, meaning you can use as much or as little of Vue as you need. Vue is known for its simplicity and ease of integration with other projects and libraries.
svelte
Svelte is a radical new approach to building user interfaces. Whereas traditional frameworks like React and Vue do the bulk of their work in the browser, Svelte shifts that work into a compile step that happens when you build your app. Svelte writes code that updates the DOM when the state of your app changes.
packaged angular
This package contains the legacy AngularJS (version 1.x). AngularJS support has officially ended
as of January 2022.
See what ending support means and
read the end of life announcement.
See @angular/core
for the actively supported Angular.
Install
You can install this package either with npm
or with bower
.
npm
npm install angular
Then add a <script>
to your index.html
:
<script src="/node_modules/angular/angular.js"></script>
Or require('angular')
from your code.
bower
bower install angular
Then add a <script>
to your index.html
:
<script src="/bower_components/angular/angular.js"></script>
Documentation
Documentation is available on the
AngularJS docs site.
License
The MIT License
Copyright (c) 2022 Google LLC
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.