Can we select the nth child in Tailwind CSS version 3 using any method?

Question

Can we select the nth child in Tailwind CSS version 3 using any method?

I currently have 10 items that I am iterating through to display each one. I would like the opacity of the last element to be the lowest and the first element to be the highest. While I am familiar with using :first and :last in tailwind-css, I am curious if there is a way to target, for example, the 8th or 9th element using tailwind-css.

Below is the return statement from a component:

    {[0,1,2,3,4,5,6,7,8,9].map((item) => (
                            <section
                                key={item}
                                className='last:opacity-20 flex justify-between items-center text-slate-600 bg-white shadow-sm p-5 rounded-xl my-4 cursor-pointer dark:bg-black dark:text-slate-400'
                            >
                                <div className='flex gap-3 items-center'>
                                    <div className='rounded-full w-8 h-8 bg-slate-200'></div>
                                    <p className='w-44 h-4 bg-slate-100'></p>
                                </div>
                                <p className='w-16 h-4 bg-slate-100'></p>
                            </section>
                        ))}

My goal is to decrease the opacity as you move downwards the list, starting from the first item.

css reactjs tailwind-css

Answer 1

Answer №1

Using arbitrary variants is a great way to achieve this.

Take, for instance, the following code snippet:

<section className="[&:nth-child(8)]:opacity-25">
</section>

This will apply an opacity of 0.25 to a section element that is the eighth child.

Answer 2

Using arbitrary variants is a great way to achieve this.

Take, for instance, the following code snippet:

<section className="[&:nth-child(8)]:opacity-25">
</section>

This will apply an opacity of 0.25 to a section element that is the eighth child.

Answer 3

Answer №2

Utilizing nth-child selectors is made simple with the introduction of Tailwind v3.2 and its matchVariant feature

// tailwind.config.js
let plugin = require("tailwindcss/plugin");

module.exports = {
  plugins: [
    plugin(function ({ matchVariant, theme }) {
      matchVariant(
        'nth',
        (value) => {
          return `&:nth-child(${value})`;
        },
        {
          values: {
            DEFAULT: 'n', // Default value for `nth:`
            '2n': '2n', // `nth-2n:utility` will generate `:nth-child(2n)` CSS selector
            '3n': '3n',
            '4n': '4n',
            '5n': '5n',
            //... add more if needed
          },
        }
      );
    }),
  ],
}

Example - elements with a 2n index will be styled in red, 1st, 6th, 11th, 5n+1 will be green, and every fifth element will be blue (note that styles may overlap demonstrating usage from configuration or arbitrary variants)

<ul class="">
  
  <li class="nth-2n:bg-red-400 nth-5n:bg-blue-500 nth-[5n+1]:bg-green-500 p-2">1</li>
  <li class="nth-2n:bg-red-400 nth-5n:bg-blue-500 nth-[5n+1]:bg-green-500 p-2">2</li>
  <li class="nth-2n:bg-red-400 nth-5n:bg-blue-500 nth-[5n+1]:bg-green-500 p-2">3</li>
  <li class="nth-2n:bg-red-400 nth-5n:bg-blue-500 nth-[5n+1]:bg-green-500 p-2">4</li>
  <li class="nth-2n:bg-red-400 nth-5n:bg-blue-500 nth-[5n+1]:bg-green-500 p-2">5</li>
  <li class="nth-2n:bg-red-400 nth-5n:bg-blue-500 nth-[5n+1]:bg-green-500 p-2">6</li>

</ul>

LIVE DEMO

If you are using versions before 3.2, you will have to manually create a variant using addVariant for each nth-child selector

Answer 4

Utilizing nth-child selectors is made simple with the introduction of Tailwind v3.2 and its matchVariant feature

// tailwind.config.js
let plugin = require("tailwindcss/plugin");

module.exports = {
  plugins: [
    plugin(function ({ matchVariant, theme }) {
      matchVariant(
        'nth',
        (value) => {
          return `&:nth-child(${value})`;
        },
        {
          values: {
            DEFAULT: 'n', // Default value for `nth:`
            '2n': '2n', // `nth-2n:utility` will generate `:nth-child(2n)` CSS selector
            '3n': '3n',
            '4n': '4n',
            '5n': '5n',
            //... add more if needed
          },
        }
      );
    }),
  ],
}

Example - elements with a 2n index will be styled in red, 1st, 6th, 11th, 5n+1 will be green, and every fifth element will be blue (note that styles may overlap demonstrating usage from configuration or arbitrary variants)

<ul class="">
  
  <li class="nth-2n:bg-red-400 nth-5n:bg-blue-500 nth-[5n+1]:bg-green-500 p-2">1</li>
  <li class="nth-2n:bg-red-400 nth-5n:bg-blue-500 nth-[5n+1]:bg-green-500 p-2">2</li>
  <li class="nth-2n:bg-red-400 nth-5n:bg-blue-500 nth-[5n+1]:bg-green-500 p-2">3</li>
  <li class="nth-2n:bg-red-400 nth-5n:bg-blue-500 nth-[5n+1]:bg-green-500 p-2">4</li>
  <li class="nth-2n:bg-red-400 nth-5n:bg-blue-500 nth-[5n+1]:bg-green-500 p-2">5</li>
  <li class="nth-2n:bg-red-400 nth-5n:bg-blue-500 nth-[5n+1]:bg-green-500 p-2">6</li>

</ul>

LIVE DEMO

If you are using versions before 3.2, you will have to manually create a variant using addVariant for each nth-child selector

Answer 5

Answer №3

While the solution below does not utilize nth-child, it achieves the desired outcome: each list item will progressively decrease in opacity.

 {[0, 1, 2, 3, 4, 5, 6, 7, 8, 9].map((item) => {
        // Create the class name dynamically
        // Tailwind configuration needed as outlined later
        const opacity = `opacity-${(10 - item) * 10}`;

        // Changed bg color to black for better visibility
        return (
          <section
            key={item}
            className={`${opacity} flex justify-between items-center text-slate-600 bg-black shadow-sm p-5 rounded-xl my-4 cursor-pointer dark:bg-black dark:text-slate-400`}
          >
            <div className="flex gap-3 items-center">
              <div className="rounded-full w-8 h-8 bg-slate-200"></div>
              <p className="w-44 h-4 bg-slate-100"></p>
            </div>
            <p className="w-16 h-4 bg-slate-100"></p>
          </section>
        );
      })}

Prior to rendering this content, make sure to update Tailwind's configuration file tailwind.config.cjs with the following settings:

const opacitySafeList = [];

for (i = 1; i < 11; i++) {
  opacitySafeList.push(`opacity-${i * 10}`);
}

module.exports = {
  content: ["...content of the project"],

// Instruct Tailwind to generate these specific class names that are not included by default 
  safelist: opacitySafeList,

  theme: {
    extend: {},
  },
  plugins: [],
};

This method (safe list) is typically a last resort according to Tailwind's guidelines, but it appears to be suitable for addressing this particular issue.

Answer 6

While the solution below does not utilize nth-child, it achieves the desired outcome: each list item will progressively decrease in opacity.

 {[0, 1, 2, 3, 4, 5, 6, 7, 8, 9].map((item) => {
        // Create the class name dynamically
        // Tailwind configuration needed as outlined later
        const opacity = `opacity-${(10 - item) * 10}`;

        // Changed bg color to black for better visibility
        return (
          <section
            key={item}
            className={`${opacity} flex justify-between items-center text-slate-600 bg-black shadow-sm p-5 rounded-xl my-4 cursor-pointer dark:bg-black dark:text-slate-400`}
          >
            <div className="flex gap-3 items-center">
              <div className="rounded-full w-8 h-8 bg-slate-200"></div>
              <p className="w-44 h-4 bg-slate-100"></p>
            </div>
            <p className="w-16 h-4 bg-slate-100"></p>
          </section>
        );
      })}

Prior to rendering this content, make sure to update Tailwind's configuration file tailwind.config.cjs with the following settings:

const opacitySafeList = [];

for (i = 1; i < 11; i++) {
  opacitySafeList.push(`opacity-${i * 10}`);
}

module.exports = {
  content: ["...content of the project"],

// Instruct Tailwind to generate these specific class names that are not included by default 
  safelist: opacitySafeList,

  theme: {
    extend: {},
  },
  plugins: [],
};

This method (safe list) is typically a last resort according to Tailwind's guidelines, but it appears to be suitable for addressing this particular issue.

Can we select the nth child in Tailwind CSS version 3 using any method?

Answer №1

Answer №2

Answer №3

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