registerOnError, unregisterOnError
Register a callback function listening for error events. The
callback function receives an error code and message.
Demo
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Register the error handler.
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Unregister the error handler.
After the error handler has been registered, you can provoke errors:
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Try opening a file which does not exist.
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Try adding a comment while no model is open.
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Error handling for a closed WebSocket connection can be
demonstrated by shutting down the server. Before you try this,
make sure the server is not in productive use.