blockly > FieldDropdown > (constructor)


Constructs a new instance of the FieldDropdown class


constructor(menuGenerator: MenuGenerator, validator?: FieldDropdownValidator, config?: FieldDropdownConfig);


Parameter Type Description
menuGenerator MenuGenerator A non-empty array of options for a dropdown list, or a function which generates these options. Also accepts Field.SKIP_SETUP if you wish to skip setup (only used by subclasses that want to handle configuration and setting the field value after their own constructors have run).
validator FieldDropdownValidator (Optional) A function that is called to validate changes to the field's value. Takes in a language-neutral dropdown option & returns a validated language-neutral dropdown option, or null to abort the change.
config FieldDropdownConfig (Optional) A map of options used to configure the field. See the [field creation documentation] for a list of properties this parameter supports.


{TypeError} If menuGenerator options are incorrectly structured.