What is two-way data binding in Angular?

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Two-way data binding in Angular is a mechanism that allows synchronization between the component class (TypeScript) and the view (HTML template). It means that any changes in the user interface are immediately reflected in the component’s data, and vice versa.

This is especially useful in form inputs, where user interaction needs to update the application’s state, and the state may also need to update the UI.

🔄 How It Works

Angular achieves two-way data binding using the [(ngModel)] directive, which is a combination of:

• Property binding: [ngModel] — binds data from the component to the view.

• Event binding: (ngModelChange) — listens for changes in the view and updates the component.

Combined, they form the banana-in-a-box syntax:

In this example:

• Typing into the input field updates the username variable in the component.

• Changes to username in the component update the input field.

✅ Requirements:

To use [(ngModel)], you must import the FormsModule in your Angular module:

📝 Summary

Two-way data binding in Angular simplifies communication between the component and the view, allowing real-time data updates in both directions. It is most commonly used with forms and user input handling.

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