Callback function for DropdownMenuElement's ondropdownopen property. Explicitly returning false will prevent the menu from opening, and the default "click" or "contextmenu" behaviour will not be prevented.
DropdownMenuElement
ondropdownopen
false
Callback function for
DropdownMenuElement'sondropdownopenproperty. Explicitly returningfalsewill prevent the menu from opening, and the default "click" or "contextmenu" behaviour will not be prevented.