#server actions

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autumn summit
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server actions

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#

To use Server Actions with data validation in Next.js, you can create a wrapper function that validates or sanitizes the data before invoking the action. Here's an example of how to do this:

  1. First, enable the experimental serverActions flag in your next.config.js file:
module.exports = {
  experimental: {
    serverActions: true,
  },
};
  1. Create a validation function in a separate file, for example, lib/form-validation.js:
export function withValidate(action) {
  return (formData: FormData) => {
    'use server';

    const isValidData = verifyData(formData);

    if (!isValidData) {
      throw new Error('Invalid input.');
    }

    const data = process(formData);
    return action(data);
  };
}

In this example, verifyData and process are functions that you should implement to validate and sanitize the data according to your requirements.

  1. Import the withValidate function in your app/actions.js file and use it to wrap your Server Action:
'use server';

import { withValidate } from 'lib/form-validation';

export const action = withValidate((data) => {
  // ...
});
  1. In your component, create a form that uses the Server Action for data submission:
import { action } from '../actions';

function MyComponent() {
  return (
    <form action={action}>
      <input type="text" name="inputName" />
      <button type="submit">Submit</button>
    </form>
  );
}

When the form is submitted, the data will be validated using the withValidate wrapper function. If the data is valid, the Server Action will be invoked, and you can display the result in your component as needed.

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autumn summit
#

@compact night
now imagine the inputName needs to be 3 letters long
how do i display the data is invalid on the page?

compact nightBOT
#

Let me check the knowledge base for you. One moment! :books:

#

To display an error message on the page when the inputName is not 3 letters long, you can use JavaScript-based form validation. Here's how you can do it:

  1. Create a form with an onSubmit event handler in your component:
<form onSubmit={validateFormWithJS}>
  <label htmlFor="inputName">Input Name:</label>
  <input type="text" name="inputName" id="inputName" />
  <button type="submit">Submit</button>
</form>
  1. Implement the validateFormWithJS function to validate the inputName length and display an error message if it's not 3 letters long:
import { useState } from 'react';

function MyComponent() {
  const [errorMessage, setErrorMessage] = useState('');

  function validateFormWithJS(event) {
    event.preventDefault();

    const inputName = document.querySelector('#inputName').value;

    if (inputName.length !== 3) {
      setErrorMessage('Input Name should be exactly 3 letters long.');
      return false;
    }

    // If the input is valid, you can submit the data to the server
    // and clear the error message
    setErrorMessage('');
    // Submit data to the server...
  }

  return (
    <>
      <form onSubmit={validateFormWithJS}>
        <label htmlFor="inputName">Input Name:</label>
        <input type="text" name="inputName" id="inputName" />
        <button type="submit">Submit</button>
      </form>
      {errorMessage && <p>{errorMessage}</p>}
    </>
  );
}

In this example, the validateFormWithJS function checks if the inputName is 3 letters long. If it's not, it sets the errorMessage state, which is then displayed on the page. If the input is valid, you can submit the data to the server and clear the error message.

#

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autumn summit
#

@compact night
how do i redirect programatically in the app router

compact nightBOT
#

Let me check the knowledge base for you. One moment! :books:

#

To programmatically redirect in the App Router using Next.js, you can use the useRouter hook from next/navigation. Here's an example of how to do it:

  1. Import the useRouter hook from next/navigation:
import { useRouter } from 'next/navigation';
  1. Call the useRouter hook inside your component and use the push method to navigate to a different route:
export default function Page() {
  const router = useRouter();

  return (
    <button type="button" onClick={() => router.push('/dashboard')}>
      Dashboard
    </button>
  );
}

In this example, when the button is clicked, the user will be redirected to the /dashboard route.

Source: useRouter Hook (https://nextjs.org/docs/app/building-your-application/routing/linking-and-navigating#use-router-hook)

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autumn summit
#

@compact night how do i cache an api route

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#

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#

To cache an API route in Next.js, you can set the Cache-Control header in your API route using the response.setHeader method. Here's an example:

  1. Create an API route file, for example, pages/api/user.js:
export default function handler(req, res) {
  res.setHeader('Cache-Control', 's-maxage=86400');
  res.status(200).json({ name: 'John Doe' });
}

In this example, the Cache-Control header is set to s-maxage=86400, which means the response will be cached for 86400 seconds (1 day).

Note: Cache-Control headers cannot be set using next.config.js or vercel.json (for other frameworks) files.

Sources:

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autumn summit
#

@compact night how do i cache an api route in the app dir

compact nightBOT
#

Let me check the knowledge base for you. One moment! :books:

#

To cache an API route in the app directory in Next.js, you can use the fetch function with the options.next.revalidate property. Here's an example:

  1. Create an API route file, for example, app/api/user.ts:
export default function handler(req, res) {
  res.setHeader('Cache-Control', 's-maxage=86400');
  res.status(200).json({ name: 'John Doe' });
}
  1. In your component or layout, use the fetch function to fetch data from the API route:
import fetch from 'next/fetch';

export async function getStaticProps() {
  const data = await fetch('<https://your-domain.com/api/user',> {
    next: { revalidate: 86400 },
  });

  return {
    props: {
      data,
    },
  };
}

In this example, the Cache-Control header is set to s-maxage=86400, which means the response will be cached for 86400 seconds (1 day). The options.next.revalidate property is also set to 86400 seconds, ensuring that the cache is revalidated after 1 day.

Sources:

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#

@autumn summit kapa.ai is still learning and improving, please let us how it did by reacting below

autumn summit
#

@compact night router.push('/') but do a full reload

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