ValidityState

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ValidityState 介面表示了一個元素目前在其檢核條件下驗證的正確性狀態(validity states)。同時,它們也可以協助解釋元素值檢核失敗的原因,如果元素值為不合法的。

屬性

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.

規範

Specification Status Comment
WHATWG HTML Living Standard
The definition of 'ValidityState' in that specification.
Living Standard Live Standard
HTML 5.1
The definition of 'ValidityState' in that specification.
Recommendation No change from the previous snapshot HTML5.
HTML5
The definition of 'ValidityState' in that specification.
Recommendation First snapshot of  WHATWG HTML Living Standard containing this interface.

瀏覽器相容性

Feature Chrome Edge Firefox (Gecko) Internet Explorer Opera Safari
Basic support (Yes) (Yes) (Yes) 10 (Yes) 10.0.3
badInput ? (Yes) 29 (29) ? ? 10.0.3
Feature Android Chrome for Android Edge Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support (Yes) (Yes) (Yes) (Yes) (Yes) (Yes) (Yes)
badIndput ? ? 29.0 (29) ? ? ?

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