HTMLTextAreaElement: setCustomValidity() method
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 setCustomValidity()
method of the HTMLTextAreaElement
interface sets the custom validity message for the <textarea>
element. Use the empty string to indicate that the element does not have a custom validity error.
Syntax
js
setCustomValidity(string)
Parameters
string
-
The string containing the error message. The empty string removes any custom validity errors.
Return value
None (undefined
).
Examples
In this example, if the <textarea>
's doesn't pass constraint validation, we provide custom errors based on the constraint that is failing validation. If the value is valid, we set the custom error to an empty string:
js
const comment = document.getElementById("comment");
if (comment.validity.valueMissing) {
comment.setCustomValidity("We can't submit a blank comment!");
} else if (comment.validity.tooShort) {
comment.setCustomValidity("Tell us more! Your comment is too short.");
} else if (comment.validity.tooLong) {
comment.setCustomValidity(
"Loquacious much? Keep it to under 800 characters!",
);
} else {
comment.setCustomValidity("");
}
Specifications
Specification |
---|
HTML Standard # dom-cva-setcustomvalidity-dev |
Browser compatibility
BCD tables only load in the browser