blockly > FieldDropdown > (constructor)
FieldDropdown.(constructor)
Constructs a new instance of the FieldDropdown class
Signature:
constructor(menuGenerator: MenuGenerator, validator?: FieldDropdownValidator, config?: FieldDropdownConfig);
Parameters
| 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]https://developers.google.com/blockly/guides/create-custom-blocks/fields/built-in-fields/dropdown#creation for a list of properties this parameter supports. |
Exceptions
{TypeError} If menuGenerator options are incorrectly structured.