Why is it that in tailwind, bg-[#5ad0a1] works but assigning the hex value to a variable such as const color = '#5ad0a1';, and then using bg-[${color}] does not work?
<span className={`inline-flex items-center rounded-md bg-[${color}] px-2 py-2 text-md font-base text-[${color}]`}>
{params?.value}
</span>
According to the documentation on Tailwind's website:
An important thing to note about how Tailwind extracts class names is that it will only recognize classes that are complete and unbroken strings in your source files.
If you try using string interpolation or combining partial class names together, Tailwind will not be able to identify them and therefore will not generate the relevant CSS:
Therefore, if you do this, Tailwind won't detect the classes:
<span className={`bg-[${color}] text-[${color}]`}>
{children}
</span>
The recommended approach is to map your props to fixed class names:
const colorVariants = {
bg: "bg-[#5ad0a1]",
text: "text-[#5ad0a1]"
};
return (
<span
className={`inline-flex items-center rounded-md ${colorVariants.bg} px-2 py-2 text-md font-base ${colorVariants.text}`}
>
Hello
</span>
);
When working with Tailwind, it requires the actual color value (#5ad0a1) in order to generate the CSS code correctly. It doesn't convert it to HTML using JavaScript and then process the code. So, what Tailwind sees is always ${color} instead of #5ad0a1.
As a result, Tailwind may create something similar to this:
.bg-[${color}] {
background-color: ${color};
}
If you want to experiment, you can utilize CSS variables.
Add the root CSS in your JS file or directly in your CSS:
:root {
--main-color: #5ad0a1;
}
Then, in your class definition, you can use:
bg-[var(--main-color)]
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