I have also put in place a keydown event handler in which I am attempting to prevent the Delete key from actually firing. My intent was to ignore the user hitting the Delete key, and require them to use the Trashcan toolbar icon. Unfortunately, the OnClientNodeCollectionChange event fires before the keydown event, which I find strange.
I thought this additional information would be useful to you in forming your reply.
SGShyam G Syncfusion Team July 6, 2015 01:35 PM UTC
Thanks for using Syncfusion products.
Please note that when we press the delete key by selecting the nodes/connector, the nodeCollectionChange event triggers and it is a default behavior of our control. However we have implemented the feature “commandmanager”in which you can decidewhether to delete the node/connector or not. Also you can perform your operation using commandmanager in the Application level. This feature will be available in our volume 2,release, which is scheduled to release in the second week of July, 2015.