Product Class #21 | Create Invoice Template using HTML CSS | JavaScript Billing System
📘 Product Class Number
Product Class #21 – Invoice Template Creation for Billing System
🚀 Introduction
Welcome back to the PrintKhata Web App Bootcamp Series.
In the previous class, we built the Invoice Calculation Engine that automatically calculates item amounts, subtotal, delivery charges, rounding values, and final invoice totals.
In this class, we start building the Invoice Template Layout that will be used to generate the final invoice.
We design a structured invoice template that includes:
Company details and logo
Invoice number, invoice date, and due date
Client billing information
Dynamic goods table
Invoice totals section
This template will later be used to generate invoices dynamically using Google Apps Script.
📌 What You’ll Learn in This Video
Automatically adding the first invoice row on page load
Enabling the Create Invoice button after user activity
Using addEventListener() for button click events
Creating the createInvoice() function
Collecting all invoice table rows dynamically
Extracting data from each table row
Building structured objects for invoice rows
Creating the complete invoiceData object
Adding invoice number and date dynamically
Implementing due date logic (7 days later)
Fetching company and client details from the DOM
Preparing totals data (subtotal, delivery charge, rounding, total)
Sending invoice data to Google Apps Script
Using google.script.run with success and failure handlers
Structuring the invoice HTML template
Designing invoice header layout
Rendering company logo conditionally
Rendering client details dynamically
Creating dynamic goods table in the invoice template
Looping through invoice rows to render table data
Designing invoice totals section
Adding branding footer to the invoice template
Applying CSS styling to the invoice layout
🧠 Concepts Covered
JavaScript DOM Data Extraction
Dynamic Table Data Processing
Creating Structured JSON Objects
Invoice Template Architecture
Conditional Rendering in Templates
Dynamic Table Rendering using JavaScript
Event Handling using addEventListener()
Using google.script.run for server communication
HTML Template Generation for documents
💡 Tech Stack Used
HTML • CSS • JavaScript • Google Apps Script • Google Sheets • Google Drive
🎥 Previous Video Link
👉 Invoice Amount Calculation & Auto Total System
👉 • Product Class #20 | Invoice Amount Calcula...
⏭ Upcoming Videos Includes
Creating Invoice using Google Apps Script
Generating Invoice HTML dynamically
Converting Invoice HTML to PDF
Saving Invoice PDF to Google Drive
Generating Invoice Download Link
Sending Invoice via Email / WhatsApp
Building Complete Billing Workflow
🎯 Use Cases
Printing Press Billing Software
Invoice Generator Web App
Small Business Billing Systems
CRM Billing Modules
SaaS Invoice Platforms
Custom ERP Billing Systems
🎯 Who This Course Is For
JavaScript developers building real-world projects
Google Apps Script developers
Freelancers building custom business tools
SaaS founders building internal products
Developers building CRM or ERP systems
Students learning practical web app development
💡 Why This Course Matters
Most tutorials only focus on small features.
In this course, you are learning how to build a complete real-world product, including:
Dynamic invoice systems
Automated billing calculations
Document generation workflows
Cloud storage integration
These are the exact systems used in professional SaaS billing products.
📚 Product Modules Preview
1️⃣ Business Profile Management
2️⃣ Client Management
3️⃣ Goods Management
4️⃣ Dynamic Invoice Table
5️⃣ Invoice Calculation Engine
6️⃣ Invoice Template System
7️⃣ Invoice Generator (Without GST)
8️⃣ Invoice Generator (With GST)
9️⃣ Invoice PDF Generator
🔟 Dashboard & Reports
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✅ YouTube Tags
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✅ Hashtags
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#CRMProject