The jQuery Form Plugin allows you to easily and unobtrusively upgrade HTML forms to use AJAX. The main methods, ajaxForm and ajaxSubmit, gather information from the form element to determine how to manage the submit process. Both of these methods support numerous options which allows you to have full control over how the data is submitted. Submitting a form with AJAX doesn't get any easier than this!

A powerful slider for selecting value ranges, supporting dates and more.

Simple & robust form validation for Bootstrap 3.0, jQuery 2.0.2, Ajax & PHP

Alpaca generates forms on-the-fly using JSON schema and configuration to define object models, types, properties, validation logic and layout. Alpaca generates intuitive forms while giving your business the assurance of data compliance.

A jQuery plugin that suggests and autocompletes the domain whenever your users type in an email address field.

Sometimes it is useful to format user input as they type. Existing libraries lacked proper functionality / flexibility. Formatter was built from the ground up with no dependencies. There is however a jquery wrapper version for quick use.

The ultimate framework for building and validating responsive HTML5 forms.

Cross Browser CSS Checkbox Generator | Free Checkbox CSS

A jQuery plugin that gives users real time hints & progress updates as they complete forms

Image Picker is a simple jQuery plugin that transforms a select element into a more user friendly graphical interface.

An expanding text area is a multi-line text input field that expands in height to fit its contents. This UI element is commonly found in both desktop and mobile applications, such as the SMS composition field on the iPhone. Examples can also be found on the web, including on Facebook, where it’s used extensively. It’s a good choice wherever you don’t know how much text the user will write and you want to keep the layout compact; as such, it’s especially useful on interfaces targeted at smartphones.

Secure, PCI Compliant Transaction Forms With Fully Customizable CSS.

Let's say you were tasked with creating a UI in which users can rate three candy bars from their most to least favorite. A grid of radio buttons isn't a terrible way to go about this.

Ideal Forms is a small framework to build powerful and beautiful online forms.

glDatePicker is a simple, customizable, lightweight date picker calendar plugin for jQuery weighing in just over 3.5KB compressed (8KB uncompressed).

Chosen is a JavaScript plugin that makes long, unwieldy select boxes much more user-friendly. It is currently available in both jQuery and Prototype flavors.

When it comes to form validation, it’s hard to have a versatile solution that works with every form. Figuring out how to display errors is not a simple task. This is something I tried to remedy with this script. When an error needs to be displayed, the script creates a div and positions it in the top right corner of the input. This way you don’t have to worry about your HTML form structure. The rounded corner and shadow are done with CSS3 and degrade well in non compliant browsers. There is no images needed.

Zebra_Form is a PHP class that simplifies the process of creating and validating HTML forms. Its object-oriented structure promotes rapid HTML forms development and encourages developers to write clean and easily maintainable code. It frees the developers from the repetitive task of writing the code for validating forms by offering powerful built-in client-side and server-side validation.