ValidityState

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 (en-US) 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 (en-US) Read only

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

ValidityState.rangeOverflow (en-US) Read only

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

ValidityState.rangeUnderflow (en-US) Read only

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

ValidityState.stepMismatch (en-US) 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 (en-US) Read only

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

ValidityState.tooShort (en-US) Read only

Is a Boolean indicating the value fails to meet the specified minlength for HTMLInputElement or HTMLTextAreaElement (en-US) objects.

ValidityState.typeMismatch (en-US) 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
HTML Standard
# the-constraint-validation-api:validitystate-3

瀏覽器相容性

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參見