How to use template literals in tailwindcss to change classes dynamically? - css

Question

I tried to change it with this line of code it but it doesn't work
const [click, setClick] = useState(false);
const closeNav = () => {
setClick(!click);
};
const openNav = () => {
setClick(!click);
};
<div
className=" absolute inset-0 ${click ? translate-x-0 : -translate-x-full }
transform z-400 h-screen w-1/4 bg-blue-300 "
>
<XIcon onClick={closeNav} className=" absolute h-8 w-8 right-0 " />
</div>;

Answer 1

Do it like this:
<div className={`absolute inset-0 ${click ? 'translate-x-0' : '-translate-x-full'} transform z-400 h-screen w-1/4 bg-blue-300`}></div>
// Alternatively (without template literals):
<div className={'absolute inset-0 ' + (click ? 'translate-x-0' : '-translate-x-full') + ' transform z-400 h-screen w-1/4 bg-blue-300'}></div>
Just keep in mind not to use string concatenation to create class names, like this:
<div className={`text-${error ? 'red' : 'green'}-600`}></div>
Instead you can select complete class name:
<div className={`${error ? 'text-red-600' : 'text-green-600'}`}></div>
// following is also valid if you don't need to concat the classnames
<div className={error ? 'text-red-600' : 'text-green-600'}></div>
As long as a class name appears in your template in its entirety, Tailwind will not remove it from production build.
There are some more options available for you like using a library like classnames or clsx, or maybe Tailwind specific solutions like twin.macro, twind, xwind.
Further Reading:
React.js conditionally applying class names
How to dynamically add a class to manual class names?
Correct way to handle conditional styling in React
Embedding Expressions in JSX
Template literals - MDN
Optimizing for Production - Writing purgeable HTML - Tailwind CSS

Answer 2

const bgClass: any = {
gray: " bg-gray-300",
red: " bg-red-300",
orange: " bg-orange-300",
yellow: " bg-yellow-300",
green: " bg-green-300",
teal: " bg-teal-300",
blue: " bg-blue-300",
indigo: " bg-indigo-300",
purple: " bg-purple-300",
pink: " bg-pink-300 ",
}
const convertLabelToBg = (label: string, baseClass: string): string => {
let className: string = baseClass;
if (label) {
className += bgClass[label];
}
return className;
}
It worked for me.
I have followed the documentation.
https://tailwindcss.com/docs/content-configuration#dynamic-class-names