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.

Properties

For each of these Boolean properties, a value of true indicates that the specified reason validation may have failed is true, with the exception of the valid property, which is true if the element's value obeys all constraints.

ValidityState.badInput Read only

Is a Boolean indicating the user has provided input that the browser is unable to convert.

ValidityState.customError Read only

Is a Boolean indicating the element's custom validity message has been set to a non-empty string by calling the element's setCustomValidity() method.

ValidityState.patternMismatch Read only

Is a Boolean indicating the value does not match the specified pattern.

ValidityState.rangeOverflow Read only

Is a Boolean indicating the value is greater than the maximum specified by the max attribute.

ValidityState.rangeUnderflow Read only

Is a Boolean indicating the value is less than the minimum specified by the min attribute.

ValidityState.stepMismatch Read only

Is a Boolean indicating the value does not fit the rules determined by the step attribute (that is, it's not evenly divisible by the step value).

ValidityState.tooLong Read only

Is a Boolean indicating the value exceeds the specified maxlength for HTMLInputElement or HTMLTextAreaElement objects. Note: This will never be true in Gecko, because elements' values are prevented from being longer than maxlength.

ValidityState.tooShort Read only

Is a Boolean indicating the value fails to meet the specified minlength for HTMLInputElement or HTMLTextAreaElement objects.

ValidityState.typeMismatch Read only

Is a Boolean indicating the value is not in the required syntax (when type is email or url).

ValidityState.valid Read only

Is a Boolean indicating the element meets all constraint validations, and is therefore considered to be valid.

ValidityState.valueMissing Read only

Is a Boolean indicating the element has a required attribute, but no value.

Specifications

Browser compatibility

We're converting our compatibility data into a machine-readable JSON format. This compatibility table still uses the old format, because we haven't yet converted the data it contains. Find out how you can help!

See also

• Constraint validation
• Forms: Data form validation