Add interactive Color Palette Generator web app #34

Copilot · 2025-10-25T14:50:28Z

Implements a single-page color palette generator with palette management and color locking capabilities.

Implementation

Core Features

Random 5-color palette generation with hex display
Individual color locking to preserve colors across regenerations
Click-to-copy hex codes with fallback for non-HTTPS contexts
LocalStorage persistence for saved palettes
Keyboard shortcut (SPACE) for generation

Technical Details

Self-contained HTML (no dependencies, no build)
Proper hex color range (0x000000 to 0xFFFFFF)
Clipboard API with execCommand fallback
CSS Grid layout with staggered animations
Fixed saved palette indexing after display reversal

Files

webapp/
├── index.html    # 477 lines - complete SPA
└── README.md     # Usage documentation

Demo

Palette generation with locked color retention:

Saved palette management:

Run by opening webapp/index.html directly in browser or via local server.

Original prompt

Create a simple, interesting, fun web app

💬 We'd love your input! Share your thoughts on Copilot coding agent in our 2 minute survey.

Co-authored-by: austenstone <[email protected]>

austenstone

📋 Review Summary

This PR introduces a well-designed Color Palette Generator web application with strong visual appeal and good user experience. The implementation is functional and includes modern features like local storage persistence and keyboard shortcuts. However, there are several areas that need attention related to accessibility, error handling, and code maintainability.

🔍 General Feedback

Positive Highlights: The UI design is polished with smooth animations, the fallback clipboard implementation shows good cross-browser compatibility awareness, and the locked colors feature is a nice touch.
Key Concerns: Missing accessibility features (ARIA labels, keyboard navigation for interactive elements), potential XSS vulnerability through innerHTML usage, and missing input validation for localStorage data.
Architectural Notes: The single-file HTML approach is acceptable for a simple demo, but consider separating concerns (CSS/JS into separate files) if this grows in complexity.

austenstone · 2025-10-25T15:08:27Z

webapp/index.html

+        const colorNames = [
+            'Sunset', 'Ocean', 'Forest', 'Lavender', 'Coral',
+            'Mint', 'Peach', 'Sky', 'Rose', 'Amber',
+            'Teal', 'Violet', 'Crimson', 'Azure', 'Jade',


🟠 High: Random color generation comment could be clearer

The comment is accurate, but adding clarity about the hex range helps maintainability.

Suggested change

'Teal', 'Violet', 'Crimson', 'Azure', 'Jade',

function randomColor() {

// Generate random hex color (0x000000 to 0xFFFFFF)

const randomInt = Math.floor(Math.random() * 0x1000000);

return '#' + randomInt.toString(16).padStart(6, '0');

}

austenstone · 2025-10-25T15:08:46Z

webapp/index.html

+
+            // Render the palette
+            grid.innerHTML = '';
+            currentPalette.forEach((color, index) => {


🟠 High: Missing ARIA labels for accessibility

Interactive elements should have proper ARIA attributes for screen reader users to understand their purpose and state.

Suggested change

currentPalette.forEach((color, index) => {

card.innerHTML = `

<div class="color-preview" style="background-color: ${color.hex}">

<button class="lock-icon ${isLocked ? 'locked' : ''}" onclick="toggleLock(${index}, event)" aria-label="${isLocked ? 'Unlock' : 'Lock'} color ${color.hex}" aria-pressed="${isLocked}">

${isLocked ? '🔒' : '🔓'}

</button>

</div>

<div class="color-info">

<div class="color-code">${color.hex.toUpperCase()}</div>

<div class="color-name">${color.name}</div>

</div>

`;

austenstone · 2025-10-25T15:08:46Z

webapp/index.html

+
+                card.innerHTML = `
+                    <div class="color-preview" style="background-color: ${color.hex}">
+                        <button class="lock-icon ${isLocked ? 'locked' : ''}" onclick="toggleLock(${index}, event)">


🟡 Medium: Click event handler may not work correctly

The check e.target.classList.contains('lock-icon') won't work if the user clicks on the emoji inside the button. The event target would be the emoji text node, not the button.

Suggested change

<button class="lock-icon ${isLocked ? 'locked' : ''}" onclick="toggleLock(${index}, event)">

card.onclick = (e) => {

if (!e.target.closest('.lock-icon')) {

copyToClipboard(color.hex);

}

};

austenstone · 2025-10-25T15:08:46Z

webapp/index.html

+            textArea.value = text;
+            textArea.style.position = 'fixed';
+            textArea.style.top = '0';
+            textArea.style.left = '-999999px';


🟢 Low: Consider using try-catch for JSON.parse

While unlikely, localStorage data could be corrupted. Adding error handling would make the code more robust.

Suggested change

textArea.style.left = '-999999px';

function savePalette() {

let saved = [];

try {

saved = JSON.parse(localStorage.getItem('savedPalettes') || '[]');

} catch (e) {

console.error('Failed to parse saved palettes:', e);

saved = [];

}

const paletteData = currentPalette.map(c => c.hex);

austenstone · 2025-10-25T15:08:58Z

webapp/index.html

+            localStorage.setItem('savedPalettes', JSON.stringify(saved));
+            displaySavedPalettes();
+
+            // Show confirmation


🟡 Medium: Missing input validation for localStorage data

The code doesn't validate that the parsed localStorage data has the expected structure. Corrupted or malicious data could cause runtime errors.

Suggested change

// Show confirmation

function displaySavedPalettes() {

let saved = [];

try {

saved = JSON.parse(localStorage.getItem('savedPalettes') || '[]');

if (!Array.isArray(saved)) saved = [];

} catch (e) {

console.error('Failed to parse saved palettes:', e);

saved = [];

}

const container = document.getElementById('savedPalettes');

const list = document.getElementById('savedPalettesList');

austenstone · 2025-10-25T15:08:58Z

webapp/index.html

+            const saved = JSON.parse(localStorage.getItem('savedPalettes') || '[]');
+            const palette = saved[index];
+
+            currentPalette = palette.colors.map(hex => ({


🟡 Medium: Missing validation for loaded palette data

The function doesn't validate that the palette structure is correct before using it. This could cause errors if the data is corrupted.

Suggested change

currentPalette = palette.colors.map(hex => ({

function loadPalette(index) {

const saved = JSON.parse(localStorage.getItem('savedPalettes') || '[]');

const palette = saved[index];

if (!palette || !Array.isArray(palette.colors)) {

console.error('Invalid palette data');

return;

}

currentPalette = palette.colors.map(hex => ({

hex: hex,

name: randomColorName()

}));

austenstone · 2025-10-25T15:12:59Z

/copilot fetch this PR and changes made in it. Create a separate PR with tests that test the functionality.

- Create test.html with 20 automated tests - Cover color generation, palette management, locking, storage, and UI - Include custom test framework with assertions - Add detailed test documentation in README.md - Tests validate all core functionality from PR #34

austenstone · 2025-10-25T15:18:33Z

✅ Task completed! Created PR #35 with comprehensive test suite (20 automated tests) for the Color Palette Generator. Tests cover color generation, locking, storage, and UI interactions. View: #35

Copilot AI assigned Copilot and austenstone Oct 25, 2025

Initial plan

a16eae3

Copilot started work on behalf of austenstone October 25, 2025 14:51 View session

Copilot AI and others added 3 commits October 25, 2025 14:58

Add Color Palette Generator web app

8b2794a

Co-authored-by: austenstone <[email protected]>

Fix code review issues in Color Palette Generator

0bd0291

Co-authored-by: austenstone <[email protected]>

Polish code with additional improvements

cf7183b

Co-authored-by: austenstone <[email protected]>

Copilot AI changed the title ~~[WIP] Add simple and fun web app implementation~~ Add interactive Color Palette Generator web app Oct 25, 2025

Copilot AI requested a review from austenstone October 25, 2025 15:05

Copilot finished work on behalf of austenstone October 25, 2025 15:05

austenstone reviewed Oct 25, 2025

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Add comprehensive test suite for Color Palette Generator #35

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-            'Teal', 'Violet', 'Crimson', 'Azure', 'Jade',
+        function randomColor() {
+            // Generate random hex color (0x000000 to 0xFFFFFF)
+            const randomInt = Math.floor(Math.random() * 0x1000000);
+            return '#' + randomInt.toString(16).padStart(6, '0');
+        }

-            currentPalette.forEach((color, index) => {
+                card.innerHTML = `
+                    <div class="color-preview" style="background-color: ${color.hex}">
+                        <button class="lock-icon ${isLocked ? 'locked' : ''}" onclick="toggleLock(${index}, event)" aria-label="${isLocked ? 'Unlock' : 'Lock'} color ${color.hex}" aria-pressed="${isLocked}">
+                            ${isLocked ? '🔒' : '🔓'}
+                        </button>
+                    </div>
+                    <div class="color-info">
+                        <div class="color-code">${color.hex.toUpperCase()}</div>
+                        <div class="color-name">${color.name}</div>
+                    </div>
+                `;

-                        <button class="lock-icon ${isLocked ? 'locked' : ''}" onclick="toggleLock(${index}, event)">
+                card.onclick = (e) => {
+                    if (!e.target.closest('.lock-icon')) {
+                        copyToClipboard(color.hex);
+                    }
+                };

-            textArea.style.left = '-999999px';
+        function savePalette() {
+            let saved = [];
+            try {
+                saved = JSON.parse(localStorage.getItem('savedPalettes') || '[]');
+            } catch (e) {
+                console.error('Failed to parse saved palettes:', e);
+                saved = [];
+            }
+            const paletteData = currentPalette.map(c => c.hex);

-            currentPalette = palette.colors.map(hex => ({
+        function loadPalette(index) {
+            const saved = JSON.parse(localStorage.getItem('savedPalettes') || '[]');
+            const palette = saved[index];
+            if (!palette || !Array.isArray(palette.colors)) {
+                console.error('Invalid palette data');
+                return;
+            }
+            currentPalette = palette.colors.map(hex => ({
+                hex: hex,
+                name: randomColorName()
+            }));

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