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"Smart" external drag & drop

Is it possible to limit where an external item can be dropped to? For example, allowing an external item to be dropped only on the 5:00 to 6:00 slot. I realize it is possible to validate this server-side, but it would be nice to have it client-side as well.

Asked by Anonymous 3 years ago.
asp.net how-to
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The client-side validation is not implemented yet. Once it is, it will be general enough to work with external drag&drop as well.

Actually, there are three possible validation levels:

  1. Server-side. That means a roundtrip to the server and possibly showing a message.
  2. Client-side (after the event is dropped). This can already be done using EventMoveJavaScript (set EventMoveHandling="JavaScript"). Do you validation in the client-side handler and call the server if it's allowed using dpc.eventMoveCallBack().
  3. Client-side (during drag). This is probably what you are asking for. This one has to be implemented as a new feature.

Comment posted by Dan Letecky 3 years ago.
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