Command manager: is it possible to undo specific command?

[gintarasgraciovas]

Introduction

I need to undo changes made to a graph when errors are received from the backend (BE). Here's my scenario:

• A user with a slow internet connection attempts to add two connections to the graph.

• The user receives an error for the first connection and subsequently for the second one as well.

In response to these errors, I need to first undo the changes made by the first connection and then address the second one.

Is it possible to do something like that?

Steps to reproduce

No response

Restrictions & Constraints

No response

Does your question relate to JointJS or JointJS+. Select both if applicable.

JointJS, JointJS+

[kumilingus]

No, you cannot use the command manager this way. It's not possible to undo a specific command because one operation can affect subsequent operations.

For instance, consider an add operation followed by a change:color operation. If you undo the add operation, it removes the associated node. However, the change:color operation remains in the undo stack, referencing a node that no longer exists.

This scenario highlights the complexity that can be addressed by operational transformation (OT) techniques. Although OT provides a general solution, if your specific requirement is limited to undoing link reconnection operations, a simpler solution may suffice.

[gintarasgraciovas]

Thanks for the explanation.