HTMLSelectElement: validity property
The validity read-only property of the HTMLSelectElement interface returns a ValidityState object that represents the validity states this element is in.
Value
A ValidityState object.
Example
The following example gets the validity state of a select element and processes it if it is not valid:
js
const select = document.getElementById("mySelect");
const validityState = select.validity;
if (!validityState.valid) {
// Test each validity state
}