How to mark a field invalid from JavaScript?

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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.

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