How Can You Use Tailwind CSS with Dynamic Class Names in React?

Using Tailwind CSS with Dynamic Class Names

When working with React and Tailwind CSS, it can be tempting to pass dynamic values, such as context variables, as class names. However, Tailwind has a specific requirement for class names to be complete unbroken strings. As a result, simply passing a variable interpolated into a className will not work as expected.

Tailwind's documentation explicitly states, "If you use string interpolation or concatenate partial class names together, Tailwind will not find them and therefore will not generate the corresponding CSS."

Solution: Use Complete Class Names

To use Tailwind effectively with dynamic values, it is crucial to define your class names with the full set of values. For example, instead of using:

<p className={`bg-[${colors.secondary}] text-text-white`}></p>

Define the class directly in your ThemeContext:

const colors = {
  // …
  secondary: darkTheme ? "bg-[#FFFFFF]" : "bg-[#FFFFFF]",
  // …
};

Then use it in your component like this:

<p className={`${colors.secondary} text-text-white`}></p>

Alternative: Use inline Styling

If defining complete class names is not feasible, you can also use the style attribute to apply dynamic styles:

<p className="text-text-white">

This approach allows for more flexibility when working with dynamic values but requires the use of inline styling.

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