ValidityState: valid property

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since December 2018.

The read-only valid property of the ValidityState interface indicates if the value of an <input> element meets all its validation constraints, and is therefore considered to be valid.

If true, the element matches the :valid CSS pseudo-class; otherwise the :invalid CSS pseudo-class applies.

Value

A boolean that is true if the ValidityState does conform to all the constraints.

Examples

Displaying validity state

The following example checks the validity of a numeric input element. A constraint has been added using the min attribute which sets a minimum value of 18 for the input. If the user enters any value that's not a number greater than 17, the element fails constraint validation, and the styles matching input:invalid are applied.

css
input:invalid {
  outline: red solid 3px;
}
input:valid {
  outline: palegreen solid 3px;
}
html
<pre id="log">Validation logged here...</pre>
<input type="number" id="age" min="18" required />
js
const userInput = document.getElementById("age");
const logElement = document.getElementById("log");

function log(text) {
  logElement.innerText = text;
}

userInput.addEventListener("input", () => {
  userInput.reportValidity();
  if (userInput.validity.valid) {
    log("Input OK…");
  } else {
    log("Bad input detected…");
  }
});

Specifications

Specification
HTML Standard
# dom-validitystate-valid-dev

Browser compatibility

BCD tables only load in the browser

See also