jscolor - JavaScript Color Picker with opacity (alpha)
jscolor.js is a HEX and RGBA color picker that aims to stay super easy both for developers to install and for web users to use.
Installation in two lines
<script src="jscolor.js"></script>
Color: <input value="rgba(40,170,255,0.5)" data-jscolor="">
Usage examples
See http://jscolor.com/examples/
Documentation
Documentation can be found at https://jscolor.com/docs/
Features
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No framework needed:
jscolor.js is a completely self-sufficient JavaScript library consisting of only one file.
It doesn't need any frameworks (jQuery, Dojo, MooTools etc.) But it can certainly coexist alongside them.
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Cross-browser:
All modern browsers are supported, including:
Edge, Firefox, Chrome, Safari, Opera, Internet Explorer 10 and above, and others…
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Highly customizable:
jscolor provides many configuration options. Whether you need to change color picker's size or colors, or attach a function to its onchange event, the configuration can be fine-tuned for your web project.
Website
For more info on jscolor project, see jscolor website