Signature Pad

A jQuery plugin for assisting in the creation of an HTML5 canvas based signature pad. Records the drawn signature in JSON for later regeneration.

The Signature Pad jQuery plugin will transform an HTML form into a signature pad. The Signature Pad has two modes: TypeIt and DrawIt. In TypeIt mode the user’s signature is automatically generated as HTML text, styled with @font-face, from the input field where they type their name. In DrawIt mode the user is able to draw their signature on the canvas element.
The drawn signature is written out to a hidden input field as a JSON array using JSON.strinify(). Since the signature is saved as JSON it can be submitted as part of the form and kept on file. Using the JSON array, the signature can then be regenerated into the canvas element for display.
Obviously, Signature Pad has a couple extra dependencies: Douglas Crockford’s JSON2 and Google’s Explorer Canvas. (Both scripts are included in the downloadable package.)
Signature Pad tries to maintain a certain level of progressive enhancement, while still giving developers enough control. There is very little generated HTML. The HTML in the examples has some elements that should be hidden by default (including canvas). Signature Pad will trigger the display of certain items if the browser supports Javascript and canvas.
Signature Pad works with both mouse and touch devices.
Get the source code on GitHub:
http://github.com/thomasjbradley/signature-pad/

Signature Pad is able to create multiple instances on a single page by selecting multiple items with jQuery. The limitation lies in the API return; Signature Pad will only return the API for the last selected element. If you would like to store the API for multiple elements they must be initialised with separate jQuery calls.

http://thomasjbradley.ca/lab/signature-pad