Svelte: A Lightweight Framework for Building Web Applications

In the world of web development, frameworks play a crucial role in building fast, efficient, and scalable applications. One such framework that has gained popularity in recent years is Svelte. Created in 2017, Svelte is a simple tool that compiles components into JavaScript during build time, making it a great option for frontend developers.

Why Svelte?

Svelte offers several benefits that make it an attractive choice for building web applications. Here are a few reasons why you might want to consider using Svelte:

• Small size: Svelte is incredibly lightweight, with a minified size of just 4.1KB.
• Fast compilation: Svelte compiles components into JavaScript during build time, making it fast and efficient.
• Easy to learn: Svelte has a simple and intuitive API, making it easy for developers to learn and use.

Building a Svelte Application

To get started with Svelte, you’ll need to install it using npm or yarn. Once installed, you can create a new Svelte project using the npx degit command. This will set up a basic Svelte project with a main.js file and an App.svelte component.

npx degit sveltejs/template my-svelte-app

Connecting to Firebase

One of the key features of Svelte is its ability to connect to Firebase, a popular backend-as-a-service platform. To connect to Firebase, you’ll need to install the Firebase SDK using npm or yarn. Once installed, you can import the Firebase SDK into your Svelte application and initialize it with your Firebase config.

import { initializeApp } from 'firebase/app';
import { getFirestore } from 'firebase/firestore';

const app = initializeApp({
  apiKey: '',
  authDomain: '',
  projectId: '',
});

const db = getFirestore(app);

Authentication

Authentication is a critical feature of any web application, and Svelte makes it easy to implement authentication using Firebase. To authenticate users, you’ll need to create a login form and handle the login logic using Firebase’s authentication API.

import { getAuth, signInWithEmailAndPassword } from 'firebase/auth';

const auth = getAuth();
const loginForm = document.getElementById('login-form');

loginForm.addEventListener('submit', (e) => {
  e.preventDefault();
  const email = loginForm.email.value;
  const password = loginForm.password.value;
  signInWithEmailAndPassword(auth, email, password)
   .then((userCredential) => {
      // User signed in
    })
   .catch((error) => {
      // Handle error
    });
});

Adding CRUD Functionality

Once you have authentication set up, you can add CRUD (create, read, update, delete) functionality to your Svelte application using Firebase’s Realtime Database or Firestore.

Creating

To create new data, you’ll need to create a form that allows users to input data. Once the form is submitted, you can use Firebase’s addDoc function to create a new document in your database.

import { addDoc, collection } from 'firebase/firestore';

const createForm = document.getElementById('create-form');

createForm.addEventListener('submit', (e) => {
  e.preventDefault();
  const data = {
    title: createForm.title.value,
    description: createForm.description.value,
  };
  addDoc(collection(db, 'data'), data)
   .then((docRef) => {
      // Data created successfully
    })
   .catch((error) => {
      // Handle error
    });
});

Reading

To display existing data, you can use Firebase’s getDocs function to retrieve a list of documents from your database. You can then loop through the list of documents and display the data in a list.

import { getDocs, collection } from 'firebase/firestore';

const dataList = document.getElementById('data-list');

getDocs(collection(db, 'data'))
 .then((querySnapshot) => {
    querySnapshot.forEach((doc) => {
      const data = doc.data();
      const listItem = document.createElement('li');
      listItem.textContent = `${data.title}: ${data.description}`;
      dataList.appendChild(listItem);
    });
  })
 .catch((error) => {
    // Handle error
  });

Updating

To update existing data, you can use Firebase’s updateDoc function to update a document in your database. You’ll need to retrieve the document ID from the list of documents and then update the document using the updateDoc function.

import { updateDoc, doc } from 'firebase/firestore';

const updateForm = document.getElementById('update-form');

updateForm.addEventListener('submit', (e) => {
  e.preventDefault();
  const id = updateForm.id.value;
  const data = {
    title: updateForm.title.value,
    description: updateForm.description.value,
  };
  updateDoc(doc(db, 'data', id), data)
   .then(() => {
      // Data updated successfully
    })
   .catch((error) => {
      // Handle error
    });
});

Deleting

To delete existing data, you can use Firebase’s deleteDoc function to delete a document from your database. You’ll need to retrieve the document ID from the list of documents and then delete the document using the deleteDoc function.

import { deleteDoc, doc } from 'firebase/firestore';

const deleteButton = document.getElementById('delete-button');

deleteButton.addEventListener('click', () => {
  const id = deleteButton.dataset.id;
  deleteDoc(doc(db, 'data', id))
   .then(() => {
      // Data deleted successfully
    })
   .catch((error) => {
      // Handle error
    });
});