HTMLObjectElement: setCustomValidity() method
The setCustomValidity() method of the
HTMLObjectElement interface sets a custom validity message for the
element.
Syntax
setCustomValidity(errorMessage)
Parameters
errorMessage-
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. Additionally you must call the reportValidity method on the same element or nothing will happen.
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("Thats 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
| Specification |
|---|
| HTML Standard # dom-cva-setcustomvalidity-dev |
Browser compatibility
BCD tables only load in the browser