SvelteKit Named Form Actions

Overview

SvelteKit allows developers to handle form submissions dynamically using named form actions. This feature enables you to define multiple actions for a single form, streamlining the management of different submission types within the same user interface.

Key Concepts

• Form Actions: Functions that handle the submission of forms in SvelteKit. You can define these actions in your +page.server.js file.
• Named Actions: Instead of having a single action for a form, you can define multiple named actions, allowing you to specify which action to take based on the form submission.
• Form Attributes: Use the action attribute in your forms to indicate which named action to trigger.

How to Use Named Form Actions

Create the Form in Your Svelte Component: In your Svelte component, create a form and use the action attribute to specify the named action you want to trigger.

<form method="post" action="?/submitFormA">
    <input type="text" name="dataA" />
    <button type="submit">Submit Form A</button>
</form>

<form method="post" action="?/submitFormB">
    <input type="text" name="dataB" />
    <button type="submit">Submit Form B</button>
</form>

Define Actions in the Server File: In your +page.server.js, define multiple named actions. Each action is a function that handles the corresponding form submission.

export const actions = {
    submitFormA: async ({ request }) => {
        // Handle submission for Form A
    },
    submitFormB: async ({ request }) => {
        // Handle submission for Form B
    }
};

Benefits

• Clarity: Each form can clearly specify its intended action, improving maintainability.
• Reusability: The same form UI can be reused for different actions, reducing code duplication.
• Flexibility: Easily extend your forms with additional actions without complicating the existing logic.

Conclusion

Named form actions in SvelteKit provide a powerful way to manage multiple form submissions within a single component. This approach enhances the structure and readability of your code, making it easier for developers to handle complex forms efficiently.