Canvas Color Chooser Demo
This project is released to the public domain (totally free, no strings) but if you wish to credit me, I'm okay with it.
This has many possible applications, even a "popup" div for example. This popup can be loaded when first used or when the page loads, the time needed to create one is minimal.
To update the chooser via the forms, type in new values and hit enter in the section from which you wish to update. Hitting enter in the "hue" field will update it based on the h, s, and v values, hitting enter in the hex box will use the new hexadecimal value, and so forth.