Google Forms → Sheet Integration Skill

Connect HTML forms → Google Sheets via Google Apps Script. Auto-retry, toast UI, contact fallback on errors. Zero dependencies, works on any static site.

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🎯 When to Use

Trigger	Action
User says "create form", "connect Google Sheet"	Activate this skill
User says "form broken", "submit not working"	Debug using Phase 4-5
User says "add new form to page"	Start from Phase 2
User says "form for another website"	Start from Phase 1

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📋 5-Phase Workflow

Phase 1: DISCOVER → Scan forms, identify fields, determine sheet structure
Phase 2: PLAN → Design sheet columns, map form fields, create deployment plan
Phase 3: BUILD → Generate Apps Script + Frontend JS + Toast CSS
Phase 4: INTEGRATE → Wire forms to JS, add CSS, deploy Apps Script
Phase 5: VERIFY → Test submit, test retry, test error fallback

🔴 Rule: NEVER skip Phase 1. Always read existing forms first.

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Phase 1: DISCOVER (Scan & Analyze)

Goal: Understand what forms exist and what fields they have.

Actions:

1. Search for forms in the project:

   grep -r "data-form-type\|onsubmit\|<form" --include="*.html" .
   

2. For each form found, extract:

Info	How to Find
Form type	data-form-type attribute
Fields	<input name="...">, <select name="...">
Submit handler	onsubmit attribute
Page URL	File path

3. Ask user (Socratic Gate):
   • How many separate Google Sheets? (1 shared sheet or separate?)
   • What columns does each sheet need?
   • Is there a fallback contact channel? (WhatsApp, Messenger, Hotline?)
   • Fallback contact URL (e.g., https://wa.me/15551234567)

Output: Form Inventory Table

| # | Form Type | Pages | Fields | Target Sheet |
|---|-----------|-------|--------|-------------|
| 1 | massage   | 7     | name, phone, branch, problem, time, package | Sheet Massage |
| 2 | course    | 1     | name, phone, goal | Course Sheet |

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Phase 2: PLAN (Design & Map)

Goal: Map form fields → Sheet columns → Apps Script params.

Sheet Column Design

For each sheet, define columns in order:

Column	Source	Always Include
Timestamp	new Date() — auto	✅ Yes
(form fields)	e.parameter.xxx	From inventory
Page Source	e.parameter.url	✅ Yes

Naming Convention

Element	Convention
Sheet tab name	Data
Form attribute	data-form-type="<type>"
Hidden URL field	<input type="hidden" name="url" value="">
JS global function	window.submitToGoogleSheet

Deliverables Checklist

• Apps Script code per sheet
• Frontend JS with retry + toast
• Toast CSS component
• HTML form markup template
• Deploy instructions
• Verification test plan

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Phase 3: BUILD (Generate Code)

3A. Google Apps Script Template

See templates/apps-script.js for the full template.

Key rules:

• Always use doPost(e) — NOT doGet
• Always wrap in try/catch
• Always return JSON with {status: "success"} or {status: "error", message: "..."}
• Column order MUST match sheet.appendRow([...]) order
• Tab name MUST match SHEET_NAME constant

3B. Frontend JavaScript

See templates/form-submit.js for the full template.

Key features:

Feature	Detail
Auto-retry	3 attempts, exponential backoff (1s → 2s → 4s)
Toast UI	Success (green), Error (red), Retrying (amber)
Phone validation	Vietnamese format: /^0\d{8,10}$/
Button states	"Submitting..." → "Retrying (X/3)..." → reset
CORS handling	Handles opaque responses from Apps Script
Fallback	Zalo button in error toast
Auto-dismiss	Success: 6s, Error: 15s, Retrying: 10s

3C. Toast CSS

See templates/toast.css for the full template.

3 variants: --success, --error, --retrying

3D. HTML Form Markup

See templates/form-markup.html for examples.

Required attributes:

<form data-form-type="TYPE" onsubmit="window.submitToGoogleSheet(event)">
  <input type="hidden" name="url" value="">
  <!-- form fields with name="..." -->
  <button type="submit">Submit Text</button>
</form>

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Phase 4: INTEGRATE (Wire Everything)

Step-by-step:

1. Add Toast CSS → Append to main CSS file (e.g., design-system.css)
2. Add Form JS → Add to shared JS file or create js/form-handler.js
3. Update HTML forms:
   • Add data-form-type="..." attribute
   • Add onsubmit="window.submitToGoogleSheet(event)"
   • Add <input type="hidden" name="url" value="">
   • Ensure all inputs have name="..." matching Apps Script params
4. Configure URLs:
   • Replace placeholder URLs in JS with deployed Apps Script URLs
5. Configure fallback contact:
   • Replace Zalo URL in JS toast with project's contact URL

Customization Points

Setting	Location	Default
Apps Script URLs	JS URLS object	placeholder
Fallback contact	Toast Zalo link	https://zalo.me/...
Max retries	fetchWithRetry arg	3
Phone regex	Validation block	/^0\d{8,10}$/
Toast auto-dismiss	showFormToast timeouts	6s/15s/10s
Success message	.then() block	Customizable
Error message	.catch() block	Customizable

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Phase 5: VERIFY (Test & Report)

Test Checklist

#	Test Case	Expected	Status
1	Submit valid form	Toast success (green) + Zalo opens
2	Submit invalid phone	Toast error "Invalid phone number"
3	Network offline	3 retries → Toast error with Zalo button
4	Check Google Sheet	New row appears with correct data
5	Button states	Disabled during submit, resets after
6	Toast close button	Toast disappears on click
7	Mobile responsive	Toast visible above sticky CTA
8	Multiple forms same page	Each form submits independently

How to Test Retry

1. Open DevTools → Network tab
2. Block domain script.google.com
3. Submit form → Should see 3 retry attempts
4. Unblock → Submit again → Should succeed

Report Template

## Form Integration Test Report

**Date:** YYYY-MM-DD
**Pages tested:** X/Y

| Page | Form Type | Submit | Retry | Fallback | Sheet |
|------|-----------|--------|-------|----------|-------|
| index.html | massage | ✅ | ✅ | ✅ | ✅ |
| khoa-hoc.html | course | ✅ | ✅ | ✅ | ✅ |

**Issues found:** None / [list issues]
**Resolution:** [fixes applied]

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❌ Anti-Patterns

❌ Don't	✅ Do
Use alert() for feedback	Use toast notifications
No retry on failure	Auto-retry 3x with backoff
Silently fail	Show error + contact fallback
Hardcode form URLs	Use config object (URLS)
Skip phone validation	Validate before submit
Forget name attribute	Every input MUST have name
Use doGet for form submit	Use doPost only
Multiple submit handlers	One shared submitToGoogleSheet

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📑 Templates

File	Purpose
templates/apps-script.js	Google Apps Script doPost handler
templates/form-submit.js	Frontend JS with retry + toast
templates/toast.css	Toast notification CSS component
templates/form-markup.html	HTML form examples

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🔗 Related Skills

Need	Skill
Form UI/UX design	@[skills/cm-ux-master]
SEO for forms	@[skills/cm-dockit]
Form security	@[skills/vulnerability-scanner]
Deployment	@[skills/deployment-procedures]