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 HTMLInputElement interface returns a ValidityState object that represents the validity states this element is in.
A ValidityState object.
The following example gets the validity state of an input element and processes it if it is not valid:
const input = document.getElementById("myInput");
const validityState = input.validity;
if (!validityState.valid) {
// Test each validity state
}
| Specification |
|---|
| HTML> # the-constraint-validation-api:dom-cva-validity> |
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Opera | Safari | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | WebView Android | WebView on iOS | |
validity |
4 | 12 | 4 | ≤12.1 | 5 | 18 | 4 | ≤12.1 | 4 | 1.0 | 4.4 | 4 |
HTMLInputElement.checkValidity()<input><form>
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https://developer.mozilla.org/en-US/docs/Web/API/HTMLInputElement/validity