blockly > FieldTextInput > doClassValidation_
FieldTextInput.doClassValidation_() method
Ensure that the input value casts to a valid string.
Signature:
protected doClassValidation_(newValue?: any): string | null;
Parameters
| Parameter |
Type |
Description |
| newValue |
any |
(Optional) The input value. |
Returns:
string | null
A valid string, or null if invalid.
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Last updated 2024-09-18 UTC.
[null,null,["Last updated 2024-09-18 UTC."],[[["The `doClassValidation_` method in `FieldTextInput` is used to validate user input, ensuring it can be cast to a string."],["It accepts an optional `newValue` parameter representing the input and returns a valid string if the input is valid, otherwise null."],["This method is designated as `protected`, indicating it is intended for internal use within the class or its subclasses."]]],["The `doClassValidation_` method, part of the `FieldTextInput` class, validates input values to ensure they can be cast to a string. It accepts an optional `newValue` of any type as input. The method returns either a valid string if the input is acceptable or `null` if the input is invalid. This method ensures the input is a usable string.\n"]]
