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Task 3: Build the Frontend - Build a Full Stack React Application

Task 3: Build the Frontend

Time to complete

10 minutes

Overview

You will learn how to use the Amplify UI component library to scaffold out an entire user authentication flow, allowing users to sign up, sign in, and reset their password with just few lines of code. Additionally, you will build an app frontend that allows users to create, update, and delete their notes. They will also be able to upload an image and associate it with a note.

What you will accomplish

You will need two Amplify libraries for your project. The main aws-amplify library contains all of the client-side APIs for connecting your app's frontend to your backend and the @aws-amplify/ui-react library contains framework-specific UI components.

Use npm to install libraries

Open a new terminal window, navigate to you projects folder ( notesapp ), and run the following command to install these libraries in the root of the project.

npm install aws-amplify @aws-amplify/ui-react

On your local machine, navigate to the notesapp/src/index.css file, and update it with the following code to set the style of the Notes UI. Then, save the file.

:root { font-family: Inter, system-ui, Avenir, Helvetica, Arial, sans-serif; line-height: 1.5; font-weight: 400; color: rgba(255, 255, 255, 0.87); font-synthesis: none; text-rendering: optimizeLegibility; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; max-width: 1280px; margin: 0 auto; padding: 2rem; .card { padding: 2em; .read-the-docs { color: #888; .box:nth-child(3n + 1) { grid-column: 1; .box:nth-child(3n + 2) { grid-column: 2; .box:nth-child(3n + 3) { grid-column: 3;

In this step, you will update the src/App.jsx to configure the Amplify library with the client configuration file ( amplify_outputs.json ). Then, it will generate a data client using the generateClient() function. The code uses the Amplify Authenticator component to scaffold out an entire user authentication flow allowing users to sign up, sign in, reset their password, and confirm sign-in for multifactor authentication (MFA).

Additionally, the code contains the following:

createNote - Get the data from the form and use the data client to create a new note if the user selects an image. Then, the function will upload this image to Amplify storage and associate it with the new note.

deleteNote - Use the data client to delete the selected note.

Update the Amplify Authenticator component

On your local machine, navigate to the notesapp/src/App.jsx file, and update it with the following code.

import { useState, useEffect } from "react"; import { Authenticator, Button, Text, TextField, Heading, Flex, View, Image, Grid, Divider, } from "@aws-amplify/ui-react"; import { Amplify } from "aws-amplify"; import "@aws-amplify/ui-react/styles.css"; import { getUrl } from "aws-amplify/storage"; import { uploadData } from "aws-amplify/storage"; import { generateClient } from "aws-amplify/data"; import outputs from "../amplify_outputs.json"; * @type {import('aws-amplify/data').Client<import('../amplify/data/resource').Schema>} Amplify.configure(outputs); const client = generateClient({ authMode: "userPool", export default function App() { const [notes, setNotes] = useState([]); useEffect(() => { fetchNotes(); }, []); async function fetchNotes() { const { data: notes } = await client.models.Note.list(); await Promise.all( notes.map(async (note) => { if (note.image) { const linkToStorageFile = await getUrl({ path: ({ identityId }) => `media/${identityId}/${note.image}`, console.log(linkToStorageFile.url); note.image = linkToStorageFile.url; return note; console.log(notes); setNotes(notes); async function createNote(event) { event.preventDefault(); const form = new FormData(event.target); console.log(form.get("image").name); const { data: newNote } = await client.models.Note.create({ name: form.get("name"), description: form.get("description"), image: form.get("image").name, console.log(newNote); if (newNote.image) if (newNote.image) await uploadData({ path: ({ identityId }) => `media/${identityId}/${newNote.image}`, data: form.get("image"), }).result; fetchNotes(); event.target.reset(); async function deleteNote({ id }) { const toBeDeletedNote = { id: id, const { data: deletedNote } = await client.models.Note.delete( toBeDeletedNote console.log(deletedNote); fetchNotes(); return ( <Authenticator> {({ signOut }) => ( className="App" justifyContent="center" alignItems="center" direction="column" width="70%" margin="0 auto" <Heading level={1}>My Notes App</Heading> <View as="form" margin="3rem 0" onSubmit={createNote}> direction="column" justifyContent="center" gap="2rem" padding="2rem" <TextField name="name" placeholder="Note Name" label="Note Name" labelHidden variation="quiet" required <TextField name="description" placeholder="Note Description" label="Note Description" labelHidden variation="quiet" required name="image" as="input" type="file" alignSelf={"end"} accept="image/png, image/jpeg" <Button type="submit" variation="primary"> Create Note </Button> </Flex> </View> <Divider /> <Heading level={2}>Current Notes</Heading> margin="3rem 0" autoFlow="column" justifyContent="center" gap="2rem" alignContent="center" {notes.map((note) => ( key={note.id || note.name} direction="column" justifyContent="center" alignItems="center" gap="2rem" border="1px solid #ccc" padding="2rem" borderRadius="5%" className="box" <Heading level="3">{note.name}</Heading> </View> <Text fontStyle="italic">{note.description}</Text> {note.image && ( <Image src={note.image} alt={`visual aid for ${notes.name}`} style={{ width: 400 }} <Button variation="destructive" onClick={() => deleteNote(note)} Delete note </Button> </Flex> </Grid> <Button onClick={signOut}>Sign Out</Button> </Flex> </Authenticator>

Create an account

Choose the Create Account tab, and use the authentication flow to create a new user by entering your email address and a password. Then, choose Create Account.

Get verification code

You will get a verification code sent to your email. Enter the verification code to log in to the app. When signed in, you can start creating notes and delete them.

Sign into the console

Sign in to the AWS Management Console in a new browser window, and open the AWS Amplify console at https://console.aws.amazon.com/amplify/apps.

View your web app

AWS Amplify automatically builds your source code and deployed your app at https://...amplifyapp.com, and on every git push your deployment instance will update. Select the Visit deployed URL button to see your web app up and running live.