Implementing Two-Way Data Binding in Angular

Two-way data binding is a core feature of Angular that automatically synchronizes data between the component's model and the view. This means that changes made in the view (e.g., user input in a text field) are immediately reflected in the model, and vice versa. This challenge will guide you through implementing a simple component that demonstrates this powerful concept.

Problem Description

You are tasked with creating an Angular component that features a text input field and a display area. The component should implement two-way data binding between the input field's value and the display area. When the user types into the input field, the text displayed in the display area should update in real-time. Conversely, if the component's data property is changed programmatically, the input field should reflect that change.

Key Requirements:

• Create a new Angular component.
• Define a property in the component class to hold the text value.
• Bind the input field's ngModel property to the component's data property.
• Display the component's data property in a <div> element.
• Ensure that changes in either the input field or the component's data property are reflected in the other.

Expected Behavior:

1. Initially, the display area should show an empty string (or a default value you choose).
2. As the user types into the input field, the display area should update immediately with the entered text.
3. If you programmatically change the component's data property (e.g., in a button click handler), the input field should update to reflect the new value.

Edge Cases to Consider:

• Handling empty input strings.
• Ensuring the binding remains active even after component initialization.
• Consider how the binding behaves if the data property is initially null or undefined.

Examples

Example 1:

Input: User types "Hello" into the input field.
Output: The display area shows "Hello".
Explanation: The ngModel binding updates the component's data property, which in turn updates the display area.

Example 2:

Input: Component's data property is initially "World". User then types "Angular" into the input field.
Output: Initially, the display area shows "World". After typing "Angular", the display area shows "Angular".
Explanation: The initial value of the data property is displayed. Subsequent input overwrites the data property, updating the display.

Example 3: (Edge Case)

Input: Component's data property is initially null. User types "Test".
Output: Initially, the display area shows an empty string (or a default value if specified). After typing "Test", the display area shows "Test".
Explanation:  The component handles the initial null value gracefully and updates the display area when a value is entered.

Constraints

• The solution must be implemented using Angular version 14 or higher.
• The component should be self-contained and not rely on external services or modules beyond those typically included in a standard Angular project.
• The solution should be reasonably performant; avoid unnecessary DOM manipulations.
• The code should be well-formatted and easy to understand.

Notes

• Angular's ngModel directive is the key to implementing two-way data binding. Make sure you understand how it works.
• Consider using a simple template to keep the focus on the two-way binding functionality.
• You can use a button to trigger a programmatic update of the data property for testing purposes.
• Remember to import FormsModule in your module to use ngModel.