Form open (displayed) event - Triggered before the form is displayed (cancelable). Please note - this property requires the Editor extension for DataTables.
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Before a form is displayed, this event is fired. It allows the open action to be cancelled by returning false from the function.
Prior to Editor 1.3, events were prefixed with the string
on and this event was called
onPreOpen. That event name can still be used, and will function exactly the same way as the event documented here. The new name is used for simplicity and coherence with the event naming conventions in DataTables.