What is the principle of two-way data binding

Two-way data binding refers to the two-way association of data in the view and data in the model. The principle of two-way data binding is mainly based on creating models, establishing views, binding data, updating views, listening to events, processing business logic and updating views, etc. Two-way data binding is a mechanism that associates views with models, allowing data in an application to be easily passed and updated between views and models. By using two-way data binding, you can reduce the amount of code written to manually maintain data associations and improve the maintainability and readability of your application.

The operating system for this tutorial: Windows 10 system, DELL G3 computer.

Two-way data binding refers to the two-way association of data in the view (user interface) and data in the model (business logic). When the data in the view changes, the data in the model will be updated; similarly, when the data in the model changes, the data in the view will also be updated. This association is automatic, and there is no need to manually write a lot of code to maintain this association.

The principle of two-way data binding is mainly based on the following steps:

1. Create model: In the application, we need to define a model to store business logic and data. A model is usually a JavaScript object that contains properties and methods. These properties will serve as data sources in the view, and methods will be used to process the data.
2. Build a view: A view is a user interface, which is usually composed of HTML, CSS and JavaScript. In the view, we can use data binding syntax to associate properties with data in the model.
3. Bind data: Use specific data binding syntax to associate elements in the view (such as input boxes, buttons, etc.) with data in the model. This way, when the user operates in the view, the data in the model is automatically updated.
4. Update View: When the data in the model changes, the view automatically updates to reflect those changes. This is because when a property value changes in the model, it notifies the view to update the related element.
5. Listening events: In the view, we can listen to user operation events (such as clicking buttons, entering text, etc.) to trigger specific business logic. When these events are triggered, we can call methods in the model to update the data.
6. Processing business logic: When an event is triggered, the relevant business logic will be executed. These business logic can include validating user input, processing data, etc. Once the business logic is processed, we can update the data in the model.
7. Update View: When the data in the model is updated, the view will automatically update to reflect these changes. This ensures that the view and model are always in a consistent state.

The implementation of two-way data binding may vary between different frameworks and technologies. For example, in React, we use state and props to implement two-way data binding; in Vue, we use data binding syntax and computed properties to implement two-way data binding; in Angular, we Use two-way data binding syntax and controllers to implement two-way data binding.

In short, two-way data binding is a mechanism that associates views with models, which allows data in the application to be easily transferred and updated between views and models. By using two-way data binding, we can reduce the amount of code written to manually maintain data associations and improve the maintainability and readability of our applications.

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