Undo, redo with extension Elements

Developers
1

HI,

I’m facing challenges with undo, redo with extension elements, can you please suggest any example for undo, redo for extension elements.

2

What are the problems you’re facing?

3

the following issues currently facing

  • extension elements are not in in undo /redo flow.

I created the extension elements with the following way

const extensionElements = businessObject.extensionElements || moddle.create('bpmn:ExtensionElements');

Please let me know if you need more info ,
can you please suggest any working example for extension elements which have undo/redo flow

4

To guarantee a working undo/redo mechanism I’d always recommend to use commands. You could have a look on how we do it in the properties panel in some cases, with the underlying cmdHelper which uses the UpdateBusinessObjectHandler.

5

HI,
Attached is sample XML for Start element.

Start element has the 2 different types of extension elements , called
‘sample:properties’ and its child element ‘sample:property’

I’m using moddle.create API to create the ‘sample:properties’ , ‘sample:property’ . Once these elements are created , then pushing to the extension elements,

Using the following syntax for creating the bpmn:extension elements
const extensionElements = businessObject.extensionElements || moddle.create('bpmn:ExtensionElements');

when i wanted to update part of the extension elements ,i’m getting the existing bpmn:extension elements and updating the notation . xml generated as per the expectation, but when I do the Undo / Redo Operation ,old properties are similar to new properties

eg: for the first time when property desc is not present in extension elements, we are using
moddle.create and updating the bpmn extension elements , when desc is again updated with new value we are finding the existing ‘sample:property’ name with description and updating with new value
if we are updating property ‘desc’ with the values desc1 , desc2 , desc3 , desc4 , doing Undo operation showing only desc4 , when undoing multiple times property desc set to undefined

sampleXML.xml (753 Bytes)

6

When are you adding the extension elements? That is the actual question.

7

@philippfromme Thanks for the quick reply.

I show a property panel which is associated with every notation.
Whenever there is any change in the property panel values I call the function which executes the statements stated above.

8

Are you doing that using commands?

9

HI
are you referring the CmdHelper ?

we are not using bpmn-property-panel , we are using own customized property panel.

can we use the CmdHelper for our customized property panel ?

10

Of course you can use it elsewhere

import CmdHelper from 'bpmn-js-properties-panel/lib/helper/CmdHelper';
11

Thank you for quick response