Tailwind CSS Radial Progress Bar

RadialProgressBar.tsx

/* This is a react-based fork of tailwind-radial-progress-bar.
* The size is the size of the containing div, given as a tailwind dimension value
* The radius is provided as a prop, and circumference is calculated based on it.
* The strokeDashOffset is dynamically calculated from the circumference.
* The progress is a number as a percentage, such as 50, for 50%.
*/

export const RadialProgressBar = ({size, radius, progress}: { size: number, radius: number, progress: number }) => {
    const width = `w-${size}`
    const height = `h-${size}`
    const circumference = Number((2 * Math.PI * radius).toFixed(1))
    const strokeDashOffset = (circumference - (circumference * progress) / 100)

    return (
        <div className={`relative ${width} ${height}`}>
            <svg className="w-full h-full" viewBox="0 0 100 100">
                <circle
                    className="text-gray-200 stroke-current"
                    strokeWidth="10"
                    cx="50"
                    cy="50"
                    r={radius}
                    fill="transparent"
                />

                <circle
                    className="text-indigo-500  progress-ring__circle stroke-current"
                    strokeWidth="10"
                    strokeLinecap="round"
                    cx="50"
                    cy="50"
                    r={radius}
                    fill="transparent"
                    strokeDasharray={circumference}
                    strokeDashoffset={`${strokeDashOffset}px`}/>

                <text
                    x="50"
                    y="50"
                    fontSize="12"
                    textAnchor="middle"
                    alignmentBaseline="middle">{progress}%
                </text>
            </svg>
        </div>
    )
}

I saw this and left the same comment on lumotroph's gist. ... Friendly heads up!

---

Heads up the following is a bad practice for tailwind because the regexes that look for tailwind classes when building the project will fail to recognize this and will not generate CSS for it: const width = w-${size};

The only way this could work in a production build is extremely fragile and based on luck: if you happened to use the exact value e.g. w-4 somewhere else in your code that would be the only reason tailwind would know to generate final production CSS for that class.

If you're wondering why your final build isn't styled right this is your answer.

Use inline style (safest) and/or possibly tailwind arbitrary (square bracket) to define something based on css variables related to the theme.

Thank you @firxworx - response posted on that gist!