blockly > Field > validator_
Field.validator_ property
Validation function called when user edits an editable field.
Signature:
protected validator_: FieldValidator<T> | null;
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Last updated 2024-09-18 UTC.
[null,null,["Last updated 2024-09-18 UTC."],[[["`Field.validator_` is a function that's triggered when a user modifies an editable field, allowing for input validation."],["It's an optional property of the `Field` class, accepting a custom validation function or `null` if no validation is needed."],["The validation function receives the new field value and should return either the validated value, `null` to revert to the previous value, or `undefined` to accept the new value without changes."]]],[]]