App.js

This file is the main component of the Invoice generator app. Here’s an explanation of its key parts:

1. State Management:

   • InvoiceNumber: Manages the state of the invoice number input field.
   • Dates: Manages the state of the current date.
   • view: Manages the state of whether to show the invoice creation form or the PDF template.

2. Constants:

   • numbers: An array containing product names and their corresponding amounts. This data seems to be static for now.

3. Effects:

   • The useEffect hook is used to set the current date when the component mounts. It runs only once on component mount because of the empty dependency array [].

4. Functions:

   • Create: A function that changes the view state to false, indicating that the PDF template should be displayed.

5. Return Statement:

   • Conditional rendering is used based on the view state. If view is true, it displays the form to input the invoice number. If view is false, it renders the PdfTemplate component with the invoice number and date as props.

Index.js

This file is responsible for rendering the App component into the DOM. It’s using ReactDOM.createRoot which is an experimental API for concurrent rendering.

App.css

This file contains CSS styles for the App component, including styles for the form inputs, buttons, and overall layout.

Overall Structure

• The App component manages the state of the invoice number, current date, and view mode.
• It conditionally renders either the form for entering the invoice number or the PDF template.
• The PdfTemplate component is presumably responsible for generating the PDF based on the provided invoice number and date.

JavaScript Logic

• State management is handled using the useState hook.
• The useEffect hook is utilized to perform side effects like setting the current date.
• Event handling is done using inline functions in JSX, like onChange for updating the invoice number state and onClick for triggering the Create function.
• Conditional rendering is achieved using JavaScript ternary operator in JSX.

Purpose of Functions

• Create: Toggles the view between form and PDF template by setting the view state to false.
• useEffect: Sets the current date when the component mounts.