ValidityState: valueMissing 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 valueMissing property of the ValidityState interface indicates if a required control, such as an <input>, <select>, or <textarea>, has an empty value.

If the required attribute is set, and no <option> is selected or a <textarea> or user-editable <input> is empty, the valueMissing property will be true. The property is only true if the field is required and has no value; if the field is not required, or if the field is required and has a value, the value is false.

Value

A boolean that is true if the ValidityState is not set and the required attribute is.

Missing required input value

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

css
input:invalid {
  outline: red 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 if (userInput.validity.valueMissing) {
    log("Required field cannot be empty.");
  } else {
    log("Bad input detected: " + userInput.validationMessage);
  }
});

Specifications

Specification
HTML
# dom-validitystate-valuemissing-dev

Browser compatibility

Report problems with this compatibility data on GitHub
desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
valueMissing

Legend

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Full support
Full support

See also