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 field element’s setCustomValidity method.
For instance, we write
field.setCustomValidity("Invalid field.");
to call field.setCustomValidity with a validation error message string to mark it as invalid.
We write
field.setCustomValidity("");
to call field.setCustomValidity with an empty string to mark it as valid.
field is an element like input or select
Conclusion
To mark a field invalid from JavaScript, we use the field element’s setCustomValidity method.
