Adding Actions to Your Svelt Application

Introduction

Welcome to my blog, where I share helpful content about web development. In today’s article, we will explore how to add actions to your Svelt application using Svelt Kit. If you’re new here, be sure to subscribe to my channel and check out my website, consultingninja.tech, for more web development resources.

Understanding Form Actions in Svelt Kit

Before we dive into the coding part, let’s take a quick look at the documentation for Svelt Kit’s form actions. Inside the plus-page.server file, we can define actions that can be triggered from multiple locations within our application.

Default Action vs Named Actions

In Svelt Kit, we have two types of actions: default actions and named actions. Default actions are triggered automatically when a form is submitted, while named actions can be specifically called from different parts of the application.

Let’s start by setting up a simple Svelt application. We have a plus-page.spell file for the home page and a plus-page.server.js file for the server-side logic. In the plus-page.server.js file, we will define our actions.

To add actions, we need to export a constant called actions. This allows us to define the actions that can be triggered within our application. Inside the actions constant, we can access the form data using the event.request.formData method.

Let’s take a look at an example:


export const actions = async (event) => {
  const data = await event.request.formData();
  console.log(data);
};

In the above code, we define an async function that takes the event object as a parameter. Inside the function, we use event.request.formData() to retrieve the form data. We then log the data to the console for testing purposes.

Now, let’s move to the client-side code. In the plus-page.svelte file, we will create a form that triggers the defined actions.


<form method="post">
  <label for="first-name">First Name:</label>
  <input type="text" id="first-name" name="first-name" bind:value="{firstName}" />

  <label for="last-name">Last Name:</label>
  <input type="text" id="last-name" name="last-name" bind:value="{lastName}" />

  <button type="submit">Submit</button>
</form>

In the above code, we create a form with two input fields for the first name and last name. We bind the input values to variables using the bind:value syntax. When the form is submitted, the default action is triggered, which calls the actions function we defined earlier.

Named Actions

We can also define named actions that can be triggered from different parts of our application. To define a named action, we simply add a name parameter to the actions constant. Here’s an example:


export const actions = {
  register: async (event) => {
    // Code for registering a user
  },
  login: async (event) => {
    // Code for logging in a user
  }
};

In the above code, we define two named actions: register and login. Each action can contain its own logic for handling the form data.

To trigger a named action, we need to modify the form in the plus-page.svelte file. We add the action attribute to the form and specify the name of the action we want to trigger. Here’s an example:


<form method="post" action="?register">
  
  <button type="submit">Register</button>
</form>

<form method="post" action="?login">
  
  <button type="submit">Login</button>
</form>

In the above code, we have two forms: one for registration and one for login. By specifying the action="?register" attribute, we trigger the register named action when the form is submitted. Similarly, action="?login" triggers the login named action.

Conclusion

Adding actions to your Svelt application using Svelt Kit is incredibly easy and efficient. Whether you need a default action or want to trigger named actions, Svelt Kit provides a seamless experience for developers. With just a few lines of code, you can handle form submissions and perform various actions within your application.

I hope you found this article helpful in understanding how to add actions to your Svelt application. Thank you for reading, and don’t forget to like and comment below with your thoughts. Have a great day!

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Introduction

Understanding Form Actions in Svelt Kit

Default Action vs Named Actions