validationMessage read-only property of the
HTMLObjectElement interface returns a
DOMString representing a localized message that describes the
validation constraints that the control does not satisfy (if any). This is
the empty string if the control is not a candidate for constraint validation
willValidate is false), or it satisfies its constraints.
willValidate read-only property of the
HTMLObjectElement interface returns a boolean that indicates
whether the element is a candidate for constraint validation.
Returns true if the element's value has no validity problems; false otherwise. Fires an invalid event at the element in the latter case.
Returns true if the element's value has no validity problems; otherwise, returns false, fires an invalid event at the element, and (if the event isn't canceled) reports the problem to the user.
Sets a custom error, so that the element would fail to validate. The given message is the message to be shown to the user when reporting the problem to the user. If the argument is the empty string, clears the custom error.
The invalid event fires when a submittable element has been checked for validity and doesn't satisfy its constraints.
:enabled CSS pseudo-class represents any enabled element.
An element is enabled if it can be activated (selected, clicked on, typed
into, etc.) or accept focus. The element also has a disabled state, in which
it can't be activated or accept focus.
:disabled CSS pseudo-class represents any disabled element.
An element is disabled if it can't be activated (selected, clicked on, typed
into, etc.) or accept focus. The element also has an enabled state, in which
it can be activated or accept focus.
:valid CSS pseudo-class represents an element whose
contents validate successfully. This allows to easily make valid fields
adopt an appearance that helps the user confirm that their data is formatted
:invalid pseudo-class must match any element falling into
one of the following categories:
To turn a custom element into a form-associated custom element requires a few extra steps:
formAssociatedproperty to your custom element class. This tells the browser to treat the element like a form control.
attachInternals()method on the element to get access to extra methods and properties for form controls, like
Called when the browser associates the element with a form element, or disassociates the element from a form element
Called after the disabled state of the element changes, either because the disabled attribute of this element was added or removed; or because the disabled state changed on a >fieldset< that's an ancestor of this element. The disabled parameter represents the new disabled state of the element.
Called after the form is reset.