To use jQuery Wheel Color Picker Plugin, first you must include jquery.js (obviously), jquery.wheelcolorpicker.js, and wheelcolorpicker.css.
There are two ways to initialize color picker. One is by adding "data-wheelcolorpicker" attribute to the input element. The other way is by invoking $(element).wheelColorPicker() jQuery function.
When simply initializing wheel color picker with default options, a color picker is displayed as a popup under the input element containing a color wheel, value slider, and a preview box. The value generated by the color picker is in hexadecimal RGB format. If you change the format to something with alpha, an alpha slider will be added in addition to the color wheel and value component slider.
Besides the default sliders, you may also display other color component sliders. Despite the name, the color wheel can be completely hidden too.
Color picker can also be embedded in place of the input element.
Various events occurring on the color picker are passed to the respective input element.
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Project documentation
Source code repository at GitHub