---
title: "Konstantin Kafer on the Form API States System"
url: "/podcasts/drupal-voices/konstantin-kafer-on-the-form-api-states-system"
type: episode
date: 2010-08-25
updated: 2014-04-09
---

# Konstantin Kafer on the Form API States System

#  Konstantin Kafer on the Form API States System 

  

*Podcast episode player*

[Konstantin Käfer](https://kkaefer.com/) (aka [kkafer](http://drupal.org/user/14572)) talks about the [Form API States System for Drupal 7](http://api.drupal.org/api/drupal/developer--topics--forms_api_reference.html/7#states). The states system allows you to create dependencies between form elements so that you can for example make a textbox disappear when a checkbox is checked. The [Examples for Developers module](http://drupal.org/project/examples) has some more [examples of the #states syntax on api.drupal.org](http://api.drupal.org/api/function/form_example_states_form/7). For more detailed information on how to use the states system, we cover it in Chapter 12 of the [jQuery & JavaScript in Drupal](http://store.lullabot.com/products/jquery-and-javascript-in-drupal) Lullabot Learing Series video.