AngularJS Intro

Last modified on: November 24, 2024

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<h3>Angular 2.0 Introduction: Detailed Overview with Examples</h3>
<h4>Introduction</h4>
<p>Angular 2.0, a complete rewrite of AngularJS, is a modern framework for building web and mobile applications. It introduces improved performance, modularity, and flexibility. Built with TypeScript, Angular 2.0 provides developers with a robust ecosystem for creating dynamic and scalable applications.</p>
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<h4>Key Features of Angular 2.0</h4>
<ol>
<li><strong>Component-Based Architecture</strong>: Focuses on reusable and encapsulated components.</li>
<li><strong>Two-Way Data Binding</strong>: Simplifies data synchronization between the component and the view.</li>
<li><strong>TypeScript Integration</strong>: Enhances code maintainability with static typing and ES6 features.</li>
<li><strong>Dependency Injection</strong>: Efficiently manages service instances across the application.</li>
<li><strong>Improved Performance</strong>: Faster rendering with the Ahead-of-Time (AOT) compilation.</li>
<li><strong>Modular Design</strong>: Allows developers to import only required modules, reducing app size.</li>
</ol>
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<h4>Angular 2.0 Basic Example</h4>
<p><strong>HTML Structure</strong>:</p>
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<div class="flex items-center text-token-text-secondary px-4 py-2 text-xs font-sans justify-between rounded-t-md h-9 bg-token-sidebar-surface-primary dark:bg-token-main-surface-secondary select-none">html</div>
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<pre class="language-markup"><code>&lt;!DOCTYPE html&gt;
&lt;html&gt;
&lt;head&gt;
    &lt;title&gt;Angular 2.0 Example&lt;/title&gt;
    &lt;script src="https://unpkg.com/zone.js"&gt;&lt;/script&gt;
    &lt;script src="https://unpkg.com/systemjs/dist/system.js"&gt;&lt;/script&gt;
    &lt;script src="https://unpkg.com/reflect-metadata"&gt;&lt;/script&gt;
    &lt;script src="https://unpkg.com/typescript"&gt;&lt;/script&gt;
&lt;/head&gt;
&lt;body&gt;
    &lt;my-app&gt;Loading...&lt;/my-app&gt;

&lt;script type="module"&gt;
        import { NgModule } from '@angular/core';
        import { BrowserModule } from '@angular/platform-browser';
        import { Component } from '@angular/core';
        import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';

@Component({
            selector: 'my-app',
            template: '&lt;h1&gt;Welcome to Angular 2.0!&lt;/h1&gt;'
        })
        class AppComponent {}

@NgModule({
            imports: [BrowserModule],
            declarations: [AppComponent],
            bootstrap: [AppComponent]
        })
        class AppModule {}

platformBrowserDynamic().bootstrapModule(AppModule);
    &lt;/script&gt;
&lt;/body&gt;
&lt;/html&gt;
</code></pre>
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<h4>Real-World Example: Counter Component</h4>
<p><strong>Counter Example</strong>:</p>
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<pre class="language-javascript"><code>import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { Component } from '@angular/core';
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';

@Component({
    selector: 'counter-app',
    template: `
        &lt;h1&gt;Counter: {{ counter }}&lt;/h1&gt;
        &lt;button (click)="increment()"&gt;+&lt;/button&gt;
        &lt;button (click)="decrement()"&gt;-&lt;/button&gt;
    `
})
class CounterComponent {
    counter = 0;

increment() {
        this.counter++;
    }

decrement() {
        this.counter--;
    }
}

@NgModule({
    imports: [BrowserModule],
    declarations: [CounterComponent],
    bootstrap: [CounterComponent]
})
class AppModule {}

platformBrowserDynamic().bootstrapModule(AppModule);
</code></pre>
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<h3>&nbsp;</h3>
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