ElementInternals: checkValidity() method

Baseline 2023

Newly available

Since March 2023, this feature works across the latest devices and browser versions. This feature might not work in older devices or browsers.

The checkValidity() method of the ElementInternals interface checks if the element meets any constraint validation rules applied to it.

If checkValidity returns false then a cancelable invalid event is fired on the element.

Syntax

js
checkValidity()

Parameters

None.

Return value

A boolean value, true if the element meets all validation constraints.

Exceptions

NotSupportedError DOMException

Thrown if the element does not have its formAssociated property set to true.

Examples

In the following example ElementInternals.setValidity() is used to indicate that the element does not meet validation rules. Calling checkValidity() returns false. After calling setValidity again, this time indicating that all rules are marked false, checkValidity() returns true.

js
let element = document.getElementById("join-checkbox");
element.internals_.setValidity({ valueMissing: true }, "my message");
console.log(element.internals_.checkValidity()); // false
element.internals_.setValidity({});
console.log(element.internals_.checkValidity()); // true

Specifications

Specification
HTML Standard
# dom-elementinternals-checkvalidity

Browser compatibility

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