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Interface ValidityState

The ValidityState interface represents the validity states that an element can be in, with respect to constraint validation. Together, they help explain why an element's value fails to validate, if it's not valid.

MDN Reference

interface ValidityState {
    badInput: boolean;
    customError: boolean;
    patternMismatch: boolean;
    rangeOverflow: boolean;
    rangeUnderflow: boolean;
    stepMismatch: boolean;
    tooLong: boolean;
    tooShort: boolean;
    typeMismatch: boolean;
    valid: boolean;
    valueMissing: boolean;
}
Index
badInput customError patternMismatch rangeOverflow rangeUnderflow stepMismatch tooLong tooShort typeMismatch valid valueMissing
badInput: boolean

The read-only badInput property of the ValidityState interface indicates if the user has provided input that the browser is unable to convert. For example, if you have a number input element whose content is a string.

MDN Reference

customError: boolean

The read-only customError property of the ValidityState interface returns true if an element doesn't meet the validation required in the custom validity set by the element's setCustomValidity() method.

MDN Reference

patternMismatch: boolean

The read-only patternMismatch property of the ValidityState interface indicates if the value of an , after having been edited by the user, does not conform to the constraints set by the element's pattern attribute.

MDN Reference

rangeOverflow: boolean

The read-only rangeOverflow property of the ValidityState interface indicates if the value of an , after having been edited by the user, does not conform to the constraints set by the element's max attribute.

MDN Reference

rangeUnderflow: boolean

The read-only rangeUnderflow property of the ValidityState interface indicates if the value of an , after having been edited by the user, does not conform to the constraints set by the element's min attribute.

MDN Reference

stepMismatch: boolean

The read-only stepMismatch property of the ValidityState interface indicates if the value of an , after having been edited by the user, does not conform to the constraints set by the element's step attribute.

MDN Reference

tooLong: boolean

The read-only tooLong property of the ValidityState interface indicates if the value of an or

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