Quote:Are these all the client events that can be handled by imagemap?
Yes.
Quote:What about using PageMethods instead of updatepanel? Do you reckon that should increase performance?
I don't think it will help much, given post processing time is spent for creating the new image.
Quote:Would there be a way to override source code to allow nodemodifed at client side?
No, the diagram image cannot be redrawn on the client side when you modify a node, so the postback is necessary. Of course you could add some JavaScript from server side to execute when the page is reloaded if you need to run JavaScript code in response, but there's no much point in that when you can handle the server event.
Quote:Does imagemap javascript use same reference document as javaapplet?
No. All you can do from the ImageMap client event is access the item's ZIndex and Tag for identification purposes.
Quote:Is there a way to stop postback on say nodemodifying or nodemodified?
You can probably stop post-back, but the image will still show the old node position while the DIV representing modification will remain at new position.