What is the difference between checkvalidity () and checkvalidity () in JavaScript?

When there is no required attribute, then checkValidity () on the form returns true, as expected. When there ARE required attributes, then checkValidity () on the form returns false, as expected. HOWEVER, when the required attributes are removed with JavaScript, then checkValidity () returns false.

What is setcustomvalidity in JavaScript?

setCustomValidity (message): Adds a custom error message to the element; if you set a custom error message, the element is considered to be invalid, and the specified error is displayed. This lets you use JavaScript code to establish a validation failure other than those offered by the standard HTML validation constraints.

What is a validation message in JavaScript?

Returns true if an input element contains valid data. Sets the validationMessage property of an input element. Contains boolean properties related to the validity of an input element. Contains the message a browser will display when the validity is false. Indicates if an input element will be validated.

What does _IsValid mean in JavaScript?

In general, in JavaScript, when you see a property name prefixed with _ it means "this is internal, pretend you don't see it." +1 for a solid answer and pun wizardry. It's a shame that _isValid might vanish without a Moment's notice, though...