Component Lifecycle - React Todo AJAX

This module explored lifecycle methods in class components. In your project you will demonstrate proficiency of these concepts by building a todo app that can interact with an API to GET, POST and PATCH todos.

Objectives

• Build class components from scratch
• Get comfortable working with multiple slices of state
• Use ComponentDidMount to make an API call to GET resources from an API
• Use a submit event handler to POST a new resource to the server
• Use a click handler to PATCH an existing resource on the server
• Update the frontend to keep it in sync with the state of the server
• Use frontend filtering to display only some resources

Introduction

In this project you will build an application that allows for todos to be added, completed and removed from view. This application should:

• Use this gif as inspiration for building the DOM
• Try out this prototype
• Hold all todos in state within the App.js component
• Allow for a todo's completed status to be toggled back and forth when clicking on a todo
• Allow for a todo to be added when submitting the new todo form
• Allow for completed todos to be filtered out of view when clicking the clear completed button

Tools

• Node 16.x
• NPM 8.x (update NPM executing npm i -g npm)
• Postman (download the desktop version here)
• Chrome >= 96.x

Other browser/Node/NPM configurations might work but haven't been tested.

Project Set Up

• Fork, clone, and npm install.
• Launch the project on a development server executing npm run dev.
• Visit your app by navigating to http://localhost:3000 with Chrome.

Project Instructions

API Endpoints

The following endpoints exist in this project and should be explored with Postman prior to coding:

• GET http://localhost:9000/api/todos
  1. Expects no payload
  2. Makes no changes on the server
  3. responds with 200 OK and a payload with all the todos
• POST http://localhost:9000/api/todos
  1. Expects a payload with name (string) and optional completed (boolean)
  2. Creates a new todo on the server
  3. responds with 201 Created and a payload with the new todo
• PATCH http://localhost:9000/api/todos/:id
  1. Expects no payload
  2. Flips the completed property on the todo with the id provided in the URL
  3. Responds with 200 OK and the updated todo

The API will make other responses if the requests are defective:

• 422 Unprocessable Entity when a required payload is missing or incorrect
• 404 Not Found when the requested todo does not exist, or when the URL is incorrect

React Components

Build all components as class components. Find them inside frontend/components. Don't focus on styling. We want you to worry about function over form today. Your React application must consume the endpoints above to achieve the following functionality:

• Your app should display a list of todos, an input field, a submit button, and a button to filter out completed todos
• <App /> will hold all of the state machinery:
  • Application state, held in component state
  • State-changing methods, event handlers
• <TodoList /> receives your todos array and iterates over the list generating a new <Todo /> for each element in the array
• <Todo /> is a component that takes in the todo data and displays the task to the screen
• <Form /> will hold your input field and your Add Todo and Clear Completed buttons
  • Your input field should take in user input, and allow a user to press Enter or click on the Submit Button to add a todo to your list
  • Once a todo is submitted, the Todo List should re-render and show the added todo

Submission Format

• Only work on main.
• Avoid committing broken code, but commit as often as possible
• Refer to Canvas for additional submission instructions