blockly > FieldDropdown > doClassValidation_
FieldDropdown.doClassValidation_() method
Ensure that the input value is a valid language-neutral option.
Signature:
protected doClassValidation_(newValue: string): string | null | undefined;
Parameters
| Parameter | Type | Description |
|---|---|---|
| newValue | string | The input value. |
Returns:
string | null | undefined
A valid language-neutral option, or null if invalid.