Implementation of Undo/Redo feature in an AngularJS CRUD application

We are exploring the idea of developing an AngularJS application similar to Excel that includes support for undo/redo functionality when editing cells.

Do you have any suggestions on the most effective approach to implement this feature?

I am not only interested in undoing changes made to a single cell, but also being able to undo changes made across multiple cells.

I have tried saving the current model state on a stack before each modification, allowing me to restore the model to a previous state for undo actions. However, I'm unsure how to integrate this with REST CRUD operations.

The typical method for handling CRUD is to make immediate REST calls to the backend (updating the database) after each modification. But if we follow this approach, undo actions will only update the Angular model without affecting the database. Additionally, sending the delta between the two models over REST isn't straightforward.

javascriptangularjsundoundo-redo

Answer №1

In my opinion, the concept of capturing and manipulating state in an application is not exclusive to angular-js, but rather a fundamental aspect of functionality achieved through state management.

Any actions taken within the app, whether it's editing content, adding elements, or moving objects, will result in changes to the overall state. These changes can be recorded as deltas and stored in a structure that allows for easy rollback and undo functionality.

For example, if you were to undo 2 actions and then perform a new action, the two previous states would be removed from the history and the latest state would be added.

Software applications like Photoshop utilize a similar approach to storing user actions and history, with limitations on how far back you can undo changes.

However, I believe that this type of functionality should not be restricted to any specific framework like angular, but could certainly be implemented as a service within an angular environment.

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