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Forms API
JavaScript | HTML5
Learn how to use the Forms API to process forms on your website. After reading this guide, you will know how to send forms from your JavaScript code, how to validate forms, and how to modify a form in real time according to the values inserted by the user.
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Quick Guides for Masterminds are excerpts from our best-selling books SwiftUI for Masterminds, UIKit for Masterminds, and HTML5 for Masterminds, providing a cost-effective alternative to getting the information you need.

With this guide, you will learn how to use the Forms API to process forms on your website. After reading this guide, you will know how to send forms from your JavaScript code, how to validate forms, and how to modify a form in real time according to the values inserted by the user.
Table of Contents
FORMS API
Processing Forms
Validation
Custom Errors
The invalid Event
The ValidityState Object
Pseudo-Classes
Valid and Invalid
Optional and Required
In-range and Out-of-range
QUICK REFERENCE
Methods
Events
Validation
Examples
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Listing 1: Submitting a form from JavaScript
Listing 2: Getting a reference to the <form> element from the forms property
Listing 3: Checking the validity of the form
Listing 4: Setting custom error messages
Listing 5: Creating a custom validation system
Listing 6: Validation in real time
Listing 7: Reading validity states to display a customized error message
Listing 8: Using the :valid and :invalid pseudo-classes
Listing 9: Using the :required and :optional pseudo-classes
Listing 10: Using the :in-range and :out-of-range pseudo-classes
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Validity State
FormData Reference
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