Disallow Submitting an Empty Form with React Final Form 'pristine' property

Tomasz Łakomy
InstructorTomasz Łakomy
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Published 5 years ago
Updated 5 years ago

In this lesson we are going to see how you can use pristine property from React Final Form render prop to ensure that users won't be able to submit (or reset) an empty form.

Instructor: [00:00] We have a form created with React Final Form. We have two fields, one for first name, the other one for second name. There are also two buttons, one for submit and the other for resetting the form.

[00:13] Right now, we are able to submit the form even though both first name and second name are empty, which doesn't make sense. We would like to be able only to submit the form whenever the user has entered their name or second name.

[00:28] In order to do that, there's actually pristine property from React Final Form. The pristine property is a Boolean value which is true whenever the form is completely empty. It's false when at least something has been written, if the form has been touched in any way.

[00:48] We can use it to disable the submit button whenever pristine is set to true, so whenever there is nothing inside of the form. Right now, the submit button is disabled. We can do exactly the same for the reset button.

[01:06] This is a desired effect. Right now, I cannot submit or reset the form. If I put in my name and my second name, I can submit the form, and I can also reset it.

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