isAlphaOnly()
const isAlphaOnly: (value, fieldName) => string;
Validates that a field contains only alphabetic characters (including accented characters)
Parameters
| Parameter | Type | Description |
|---|---|---|
value | string | The input value to validate |
fieldName | string | The name of the field for error messages |
Returns
string
Empty string if valid, error message if invalid
Example
isAlphaOnly("John", "First name") // Returns: ""
isAlphaOnly("José", "First name") // Returns: ""
isAlphaOnly("François", "First name") // Returns: ""
isAlphaOnly("John123", "First name") // Returns: "First name can only contain letters."
isAlphaOnly("John-Doe", "First name") // Returns: "First name can only contain letters."