Sometimes, we want to mark a field invalid from JavaScript.
In this article, we’ll look at how to mark a field invalid from JavaScript.
How to mark a field invalid from JavaScript?
To mark a field invalid from JavaScript, we use the setCustomValidity method.
For instance, we write
field.setCustomValidity("Invalid field.");
to call field.setCustomValidity with a validation error message to make the field input invalid.
Likewise, we write
field.setCustomValidity("");
to call setCustomValidity with an empty string to make the input field valid if the input value satisfies all validation rules.
Conclusion
To mark a field invalid from JavaScript, we use the setCustomValidity method.
