🧩 Two-Way Data Binding and Angular Forms in Angular 20

Sync your UI with your data — instantly!

In this blog, we’ll explore how to bind user input to your component class and keep it updated in real-time using two-way data binding. We’ll also learn the basics of Angular Forms.

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🔁 What is Two-Way Data Binding?

Two-way binding allows synchronization between the input field in the UI and the component's variable.

This means:

• When the user updates the input, the component gets updated.

• When the component value changes, the UI reflects it immediately.

To do this in Angular, we use the [(ngModel)] syntax — also called banana in a box 🐵📦.

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🛠️ Setting Up ngModel

Before using [(ngModel)], you must import the FormsModule.

Step 1: Import FormsModule

// app.config.ts (Angular 20+)
import { provideForms } from '@angular/forms';

export const appConfig = {
  providers: [provideForms()]
};

✅ This setup is specific to Angular 20 and standalone components.
You no longer need to import FormsModule from @angular/forms in NgModules.

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📝 Simple Two-Way Binding Example

Let’s create a simple input field where users can enter their name and see it update live.

✅ Component: app.ts

export class App {
  username = '';
}

✅ Template: app.html

<input [(ngModel)]="username" placeholder="Enter your name" />
<p>Hello, {{ username }}!</p>

🔄 Output:

As you type, the username value updates in real time — both in the input box and in the greeting message.

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🧪 Form Controls with ngModel

You can use [(ngModel)] for multiple fields:

export class App {
  email = '';
  password = '';
}

<form>
  <input type="email" [(ngModel)]="email" name="email" placeholder="Email" />
  <input type="password" [(ngModel)]="password" name="password" placeholder="Password" />
  <button (click)="submitForm()">Submit</button>
</form>

💡 Don't forget the name attribute — it’s required for ngModel in forms!

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✅ Simple Form Submission

export class App {
  email = '';
  password = '';

  submitForm() {
    console.log('Email:', this.email);
    console.log('Password:', this.password);
  }
}

When you click the button, the current values of the form fields will be logged to the console.

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🧾 Summary

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📌 What’s Next?

In the next blog on The Debug Diaries, we’ll explore:

🔀 Routing and Navigation in Angular 20

Stay tuned and keep debugging with me!

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🔗 Let's Connect and Explore More!

📖 Read the full series: ngtushar.hashnode.dev/angular-series
💻 Source Code on GitHub: github.com/Tushar1409-hj
🔗 Connect with me on LinkedIn: linkedin.com/in/tushar1409

If you found this post helpful, don’t forget to share it with your fellow developers and follow the series for more Angular insights! 🚀