How can I tell if a block has been added to or removed from the workspace?

[Jayod]

I want to detect if the blocks in the main workspace have changed - if a connection has been made or removed, if a block has been added, or deleted.  Is there an easy way to do this with Blockly?

[Scott Haynes]

I'm using 

Blockly.addChangeListener( function( event ) { } );

[rajni patel]

Where to use this ??

[Neil Fraser]

The thread you replied to is two years old.  This call is now deprecated (though still works).  The preferred method is to call:

workspace.addChangeListener(function( event ) { } )

When you inject Blockly onto the page it returns a workspace object, that's a good time to add the change listener.

To see the events you have access to, go to the playground, open your JavaScript console, and drag some blocks around.

For more information, see https://developers.google.com/blockly/guides/configure/web/events

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Neil Fraser
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