HTMLButtonElement: validity property
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
The validity read-only property of the HTMLButtonElement interface returns a ValidityState object that represents the validity states this element is in.
Value
A ValidityState object.
Examples
The following example demonstrates that a is in an invalid state when a customError is set; in this state, the validityState's validity property is false, while checkValidity() returns true if the button's type is not "submit", because such buttons are not candidates for constraint validation.
js
const button = document.getElementById("myButton");
button.setCustomValidity("This button is invalid.");
const validityState = button.validity;
console.log(validityState.valid); // false
console.log(validityState.customError); // true
console.log(button.checkValidity()); // false if the button is of the "submit" type, true otherwise
Specifications
| Specification |
|---|
| HTML # the-constraint-validation-api:dom-cva-validity |