HTMLInputElement: setCustomValidity() method

Syntax

setCustomValidity(message)

Parameters

message

The message to use for validity errors.

Return value

None (undefined).

Exceptions

None.

Examples

In this example, we pass the ID of an input element and set different error messages depending on whether the value is missing, too low, or too high. Note that the message will not be displayed immediately. Attempting to submit the form will display the message, or you can call the reportValidity() method on the element.

function validate(inputID) {
  const input = document.getElementById(inputID);
  const validityState = input.validity;

  if (validityState.valueMissing) {
    input.setCustomValidity("You gotta fill this out, yo!");
  } else if (validityState.rangeUnderflow) {
    input.setCustomValidity("We need a higher number!");
  } else if (validityState.rangeOverflow) {
    input.setCustomValidity("That's too high!");
  } else {
    input.setCustomValidity("");
  }

  input.reportValidity();
}

It's vital to set the message to an empty string if there are no errors. As long as the error message is not empty, the form will not pass validation and will not be submitted.

Specifications

Browser compatibility

See also

• Learn: Client-side form validation
• Guide: Constraint validation
• ValidityState