Updte file

Fixed the build script to properly handle data-theme and data-scale attributes:
- Remove duplicate theme/scale assignments that were overriding options
- Apply theme classes to correct element (#dogCalculator)
- Support all three themes: light, dark, system
- Remove duplicate applyTheme/applyScale calls in init method

README.md

@@ -1,22 +1,44 @@
 # 🐕 Sundog Dog Food Calorie Calculator
 
-A professional veterinary nutrition tool for calculating dogs' daily calorie requirements and food amounts. Built for embedding on websites with complete brand protection options.
+A professional veterinary nutrition tool for calculating dogs' daily calorie requirements and food amounts. Features advanced multi-food source management, percentage locking, and detailed food amount breakdowns. Built for embedding on websites with complete brand protection options.
 
 **By [Canine Nutrition and Wellness](https://caninenutritionandwellness.com)**
 
 ## ✨ Features
 
+### Core Calculation Features
 - **Accurate Calculations**: Uses veterinary-standard RER formula: `70 × (weight in kg)^0.75`
 - **Multiple Activity Levels**: 11 different dog types and activity factors
 - **Multi-Region Support**: kcal/100g (EU/UK), kcal/kg, kcal/cup, kcal/can (US/Canada)
-- **Food Amount Calculator**: Converts calories to grams/kg/oz/lb of food
+- **Unit Conversion**: Automatic conversion to grams/kg/oz/lb for food amounts
+- **Smart Unit Selection**: Auto-selects grams for metric and ounces for imperial systems
+- **Unit Selection Buttons**: Intuitive button interface for choosing display units (g/kg/oz/lb)
+
+### Multi-Food Source Management
+- **Multiple Food Sources**: Add up to 5 different food sources per diet plan
+- **Percentage System**: Distribute diet percentages across multiple foods with real-time validation
+- **Percentage Locking**: Lock specific food source percentages to maintain fixed ratios
+- **Smart Redistribution**: Automatic percentage rebalancing when sources are added/removed
+- **Editable Food Names**: Click-to-edit food source names (e.g., "Morning Kibble", "Evening Wet Food")
+
+### Food Amount Breakdown
+- **Individual Food Amounts**: See exact amounts needed for each food source
+- **Per-Food Calculations**: Calculate specific quantities for different food types
+- **Total Summary**: Combined totals with clear breakdown by food source
+- **Lock Indicators**: Visual indicators showing which percentages are locked
+
+### User Experience
 - **Scalable Widget**: Easily resize from 50% to 200% with data attributes
 - **Theme Support**: Light, dark, and system themes
-- **Responsive Design**: Mobile-first, works on all devices
+- **Responsive Design**: Mobile-first, optimized layouts for all devices
-- **Brand Integration**: Uses Canine Nutrition and Wellness color scheme
 - **Two Embedding Options**: JavaScript widget and iframe
 - **Accessibility**: Full keyboard navigation and screen reader support
 
+### Brand & Integration
+- **Brand Integration**: Uses Canine Nutrition and Wellness color scheme
+- **Professional Design**: Clean, veterinary-grade interface
+- **Brand Protection**: Complete iframe isolation option
+
 ## 🚀 Quick Start
 
 ### Option 1: JavaScript Widget (Recommended)
@@ -50,6 +72,59 @@ A professional veterinary nutrition tool for calculating dogs' daily calorie req
 </iframe>
 ```
 
+## 🍽️ Multi-Food Source Usage
+
+The calculator supports complex feeding plans with multiple food sources, perfect for mixed diets combining dry food, wet food, treats, and supplements.
+
+### Basic Multi-Food Workflow
+
+1. **Start with one food source** - Calculator begins with a single "Food Source 1"
+2. **Add more sources** - Click "Add another food source" (up to 5 total)
+3. **Customize names** - Click any food source name to edit (e.g., "Morning Kibble", "Evening Wet Food")
+4. **Set energy content** - Enter kcal values and select appropriate units for each food
+5. **Adjust percentages** - Use sliders or input fields to distribute diet percentages
+6. **Lock percentages** - Click 🔒 to lock specific food source percentages
+7. **Get individual amounts** - See exact quantities needed for each food source
+
+### Percentage System Features
+
+- **Real-time Validation**: Percentages always total exactly 100%
+- **Smart Redistribution**: When you change one percentage, others adjust automatically
+- **Percentage Locking**: Lock specific sources to maintain fixed ratios
+- **Visual Feedback**: Lock indicators show which percentages are fixed
+- **Bulletproof Logic**: Prevents impossible states (negative percentages, >100% totals)
+
+### Example Usage Scenarios
+
+**Mixed Diet Example:**
+```
+Royal Canin Dry Food    → 70% (locked)
+Blue Buffalo Wet Food   → 25%
+Training Treats         → 5%
+```
+
+**Meal-Based Planning:**
+```
+Morning Kibble          → 50%
+Evening Wet Food        → 30%
+Midday Snacks          → 20%
+```
+
+**Transition Diet:**
+```
+Old Food (reducing)     → 25%
+New Food (increasing)   → 75% (locked)
+```
+
+### Food Amount Breakdown
+
+The calculator provides detailed breakdowns showing:
+- **Individual amounts** for each food source
+- **Percentage distribution** with visual indicators
+- **Lock status** for each food source
+- **Total combined amount** for the specified number of days
+- **Unit conversion** (grams, kg, oz, lb) for all amounts
+
 ## ⚙️ Configuration Options
 
 ### Theme Options
@@ -218,18 +293,39 @@ Your branding is completely protected in iframe mode. Users cannot:
 ## 🧪 Testing
 
 ### Manual Testing Checklist
+
+#### Core Functionality
 - [ ] All dog type selections work
 - [ ] Weight validation (minimum 0.1kg)
 - [ ] RER/MER calculations accurate
-- [ ] Food energy unit selector (kcal/100g, kcal/kg, kcal/cup, kcal/can)
-- [ ] Food energy validation (minimum values per unit)
 - [ ] Unit conversions (g/kg/oz/lb) correct
 - [ ] Theme switching (light/dark/system)
 - [ ] Scale options (0.5x to 2.0x) work properly
-- [ ] Collapsible section toggles
+
+#### Multi-Food Source Features
+- [ ] Add food sources (up to 5 maximum)
+- [ ] Remove food sources (minimum 1 maintained)
+- [ ] Edit food source names (click-to-edit functionality)
+- [ ] Food energy content validation per source
+- [ ] Food energy unit selector per source (kcal/100g, kcal/kg, kcal/cup, kcal/can)
+- [ ] Percentage slider adjustments work correctly
+- [ ] Percentage input field validation
+- [ ] Percentage locking/unlocking (🔒 icon)
+- [ ] Smart percentage redistribution when sources change
+- [ ] Total percentages always equal 100%
+- [ ] Individual food amount calculations
+- [ ] Food amount breakdown display
+- [ ] Add button states ("Add another food source" vs "Maximum 5 sources reached")
+
+#### User Interface
 - [ ] Mobile responsive layout
+- [ ] Collapsible section toggles
+- [ ] Visual lock indicators display correctly
+- [ ] Percentage badges and styling
 - [ ] Branded footer link works
 - [ ] Box shadows consistent across all sections
+- [ ] Food source name alignment on mobile
+- [ ] Proper input field sizing on mobile
 
 ### Browser Compatibility
 - ✅ Chrome 90+
@@ -257,8 +353,8 @@ This calculator is provided for educational and professional use. The formulas a
 ## 🔗 Links
 
 - **Website**: [caninenutritionandwellness.com](https://caninenutritionandwellness.com)
-- **Demo**: Open `embed-demo.html` in your browser
+- **Widget Demo**: Open `test-widget.html` in your browser
-- **Standalone**: Open `index.html` in your browser
+- **Standalone**: Open `iframe.html` in your browser
 
 ---
 

build.js

@@ -100,17 +100,88 @@ function transformHTMLForWidget(html) {
 }
 
 /**
- * Create production-ready widget JavaScript
+ * Create production-ready widget JavaScript that uses the ACTUAL extracted JS from iframe.html
  */
 function createWidgetJS(css, html, js) {
-    // Use original CSS and HTML without transformation for consistency
+    // Transform the extracted JavaScript from iframe.html to work as a widget
-    const widgetCSS = css;
-    const widgetHTML = html;
     
+    // Replace the iframe's DOMContentLoaded listener with widget initialization
+    let transformedJS = js
+        // Replace the iframe class name with widget class name
+        .replace(/class DogCalorieCalculator/g, 'class DogCalorieCalculatorWidget')
+        // Replace document.getElementById with scoped selectors within the widget
+        .replace(/document\.getElementById\('([^']+)'\)/g, 'this.container.querySelector(\'#$1\')')
+        // Replace direct document queries in the class with container-scoped queries
+        .replace(/document\.querySelector\(/g, 'this.container.querySelector(')
+        .replace(/document\.querySelectorAll\(/g, 'this.container.querySelectorAll(')
+        // Remove the DOMContentLoaded listener and class instantiation - we'll handle this in the widget wrapper
+        .replace(/document\.addEventListener\('DOMContentLoaded'.*?\n.*?new DogCalorieCalculator.*?\n.*?\}\);/s, '')
+        // Remove duplicate theme/scale assignments that override options
+        .replace(/this\.theme = this\.getThemeFromURL\(\) \|\| 'system';\s*\n\s*this\.scale = this\.getScaleFromURL\(\) \|\| 1\.0;/g, '')
+        // Add widget initialization methods
+        .replace(/constructor\(\) \{/, `constructor(container, options = {}) {
+            this.container = container;
+            this.options = {
+                theme: options.theme || this.getThemeFromURL() || 'system',
+                scale: options.scale || this.getScaleFromURL() || 1.0,
+                ...options
+            };
+            this.theme = this.options.theme;
+            this.scale = this.options.scale;`)
+        // Replace the init() method to inject HTML and apply widget settings
+        .replace(/init\(\) \{/, `init() {
+            // Inject the calculator HTML into the container
+            this.container.innerHTML = \`${html}\`;
+            
+            // Apply widget-specific settings
+            this.applyTheme();
+            this.applyScale();
+            
+            // Continue with original init logic`)
+        // Remove duplicate applyTheme/applyScale calls
+        .replace(/this\.applyTheme\(\);\s*\n\s*this\.applyScale\(\);\s*\n\s*this\.bindEvents/g, 'this.bindEvents');
+    
+    // Add widget-specific methods before the class closing brace
+    transformedJS = transformedJS.replace(/(\s+)(\}\s*$)/, `$1
+        getThemeFromURL() {
+            const urlParams = new URLSearchParams(window.location.search);
+            const theme = urlParams.get('theme');
+            return ['light', 'dark', 'system'].includes(theme) ? theme : null;
+        }
+
+        getScaleFromURL() {
+            const urlParams = new URLSearchParams(window.location.search);
+            const scale = parseFloat(urlParams.get('scale'));
+            return (!isNaN(scale) && scale >= 0.5 && scale <= 2.0) ? scale : null;
+        }
+
+        applyTheme() {
+            const calculatorContainer = this.container.querySelector('#dogCalculator');
+            if (calculatorContainer) {
+                // Remove existing theme classes
+                calculatorContainer.classList.remove('theme-light', 'theme-dark', 'theme-system');
+                // Add the selected theme class
+                if (['light', 'dark', 'system'].includes(this.options.theme)) {
+                    calculatorContainer.classList.add('theme-' + this.options.theme);
+                }
+            }
+        }
+
+        applyScale() {
+            const scale = Math.max(0.5, Math.min(2.0, this.options.scale));
+            if (scale !== 1.0) {
+                this.container.style.transform = \`scale(\${scale})\`;
+                this.container.style.transformOrigin = 'top left';
+            }
+        }$2`);
+
     const widgetCode = `/**
  * Dog Calorie Calculator Widget
  * Embeddable JavaScript widget for websites
  * 
+ * THIS CODE IS AUTO-GENERATED FROM iframe.html - DO NOT EDIT MANUALLY
+ * Edit iframe.html and run 'node build.js' to update this file
+ * 
  * Usage:
  * <script src="sundog-dog-food-calculator.js"></script>
  * <div id="dog-calorie-calculator"></div>
@@ -125,8 +196,8 @@ function createWidgetJS(css, html, js) {
 (function() {
     'use strict';
     
-    // Inject widget styles with proper namespacing
+    // Inject widget styles
-    const CSS_STYLES = \`${widgetCSS}\`;
+    const CSS_STYLES = \`${css}\`;
     
     function injectStyles() {
         if (document.getElementById('dog-calculator-styles')) return;
@@ -137,329 +208,8 @@ function createWidgetJS(css, html, js) {
         document.head.appendChild(style);
     }
     
-    // Main widget class
+    // ACTUAL JavaScript from iframe.html (transformed for widget use)
-    class DogCalorieCalculatorWidget {
+    ${transformedJS}
-        constructor(container, options = {}) {
-            this.container = container;
-            this.options = {
-                theme: options.theme || this.getThemeFromURL() || 'system',
-                scale: options.scale || this.getScaleFromURL() || 1.0,
-                ...options
-            };
-            this.init();
-        }
-        
-        init() {
-            // Insert the transformed calculator HTML
-            this.container.innerHTML = \`${widgetHTML}\`;
-            
-            // Apply widget-specific settings
-            this.applyTheme();
-            this.applyScale();
-            
-            // Initialize the calculator with the same functionality as iframe
-            this.initCalculator();
-        }
-        
-        initCalculator() {
-            const container = this.container;
-            
-            // Helper functions to scope DOM queries to this widget
-            const $ = (selector) => container.querySelector(selector);
-            const $$ = (selector) => container.querySelectorAll(selector);
-            
-            // Create calculator instance with exact same logic as iframe
-            const calc = {
-                currentMER: 0,
-                isImperial: false,
-                theme: this.options.theme,
-                scale: this.options.scale,
-                
-                // Exact same calculation methods from iframe
-                calculateRER: (weightKg) => 70 * Math.pow(weightKg, 0.75),
-                calculateMER: (rer, factor) => rer * factor,
-                
-                formatNumber: (num, decimals = 0) => {
-                    if (decimals === 0) return Math.round(num).toString();
-                    return num.toFixed(decimals).replace(/\\.?0+$/, '');
-                },
-                
-                validateInput: (value, min = 0, isInteger = false) => {
-                    const num = parseFloat(value);
-                    if (isNaN(num) || num < min) return false;
-                    if (isInteger && !Number.isInteger(num)) return false;
-                    return true;
-                },
-                
-                convertUnits: (grams, unit) => {
-                    switch (unit) {
-                        case 'kg': return grams / 1000;
-                        case 'oz': return grams / 28.3495;
-                        case 'lb': return grams / 453.592;
-                        default: return grams;
-                    }
-                },
-                
-                getWeightInKg: () => {
-                    const weightInput = $('#weight');
-                    if (!weightInput || !weightInput.value) return null;
-                    const weight = parseFloat(weightInput.value);
-                    if (isNaN(weight)) return null;
-                    return calc.isImperial ? weight / 2.20462 : weight;
-                },
-                
-                getFoodEnergyPer100g: () => {
-                    const foodEnergyInput = $('#foodEnergy');
-                    const energyUnitSelect = $('#energyUnit');
-                    if (!foodEnergyInput || !foodEnergyInput.value || !energyUnitSelect) return null;
-                    
-                    const energy = parseFloat(foodEnergyInput.value);
-                    if (isNaN(energy)) return null;
-                    
-                    const unit = energyUnitSelect.value;
-                    switch (unit) {
-                        case 'kcal100g': return energy;
-                        case 'kcalkg': return energy / 10;
-                        case 'kcalcup': return energy / 1.2;
-                        case 'kcalcan': return energy / 4.5;
-                        default: return energy;
-                    }
-                },
-                
-                showError: (elementId, show = true) => {
-                    const errorElement = $('#' + elementId);
-                    if (errorElement) {
-                        if (show) {
-                            errorElement.classList.remove('dog-calculator-hidden');
-                        } else {
-                            errorElement.classList.add('dog-calculator-hidden');
-                        }
-                    }
-                },
-                
-                updateCalorieCalculations: () => {
-                    const dogTypeSelect = $('#dogType');
-                    const calorieResults = $('#calorieResults');
-                    const rerValue = $('#rerValue');
-                    const merValue = $('#merValue');
-
-                    if (!dogTypeSelect || !calorieResults || !rerValue || !merValue) return;
-
-                    const weightKg = calc.getWeightInKg();
-                    const dogTypeFactor = dogTypeSelect.value;
-                    
-                    calc.showError('weightError', false);
-                    
-                    if (!weightKg || weightKg < 0.1) {
-                        const weightInput = $('#weight');
-                        if (weightInput && weightInput.value) calc.showError('weightError', true);
-                        calorieResults.style.display = 'none';
-                        return;
-                    }
-
-                    if (!dogTypeFactor) {
-                        calorieResults.style.display = 'none';
-                        return;
-                    }
-
-                    const factor = parseFloat(dogTypeFactor);
-                    const rer = calc.calculateRER(weightKg);
-                    const mer = calc.calculateMER(rer, factor);
-                    
-                    calc.currentMER = mer;
-                    
-                    rerValue.textContent = calc.formatNumber(rer, 0) + ' cal/day';
-                    merValue.textContent = calc.formatNumber(mer, 0) + ' cal/day';
-                    calorieResults.style.display = 'block';
-                    
-                    calc.updateFoodCalculations();
-                },
-                
-                updateFoodCalculations: () => {
-                    if (calc.currentMER === 0) return;
-                    
-                    const daysInput = $('#days');
-                    const unitSelect = $('#unit');
-                    const dailyFoodResults = $('#dailyFoodResults');
-                    const dailyFoodValue = $('#dailyFoodValue');
-                    const totalFoodDisplay = $('#totalFoodDisplay');
-
-                    if (!daysInput || !unitSelect || !dailyFoodResults || !dailyFoodValue || !totalFoodDisplay) return;
-
-                    const energyPer100g = calc.getFoodEnergyPer100g();
-                    const days = daysInput.value;
-                    const unit = unitSelect.value;
-                    
-                    calc.showError('foodEnergyError', false);
-                    calc.showError('daysError', false);
-                    
-                    if (!energyPer100g || energyPer100g < 0.1) {
-                        const foodEnergyInput = $('#foodEnergy');
-                        if (foodEnergyInput && foodEnergyInput.value) calc.showError('foodEnergyError', true);
-                        dailyFoodResults.style.display = 'none';
-                        totalFoodDisplay.value = '';
-                        return;
-                    }
-
-                    if (!days || !calc.validateInput(days, 1, true)) {
-                        if (days) calc.showError('daysError', true);
-                        totalFoodDisplay.value = '';
-                        return;
-                    }
-
-                    const numDays = parseInt(days);
-                    const dailyFoodGrams = (calc.currentMER / energyPer100g) * 100;
-                    const totalFoodGrams = dailyFoodGrams * numDays;
-                    
-                    dailyFoodValue.textContent = calc.formatNumber(dailyFoodGrams, 1) + ' g/day';
-                    dailyFoodResults.style.display = 'block';
-                    
-                    const convertedAmount = calc.convertUnits(totalFoodGrams, unit);
-                    const unitLabel = unit === 'g' ? 'g' : unit === 'kg' ? 'kg' : unit === 'oz' ? 'oz' : 'lb';
-                    const decimals = unit === 'g' ? 0 : unit === 'kg' ? 2 : 1;
-                    
-                    totalFoodDisplay.value = calc.formatNumber(convertedAmount, decimals) + ' ' + unitLabel;
-                },
-                
-                // Unit switching methods (missing from previous version!)
-                toggleUnits: () => {
-                    const toggle = $('#unitToggle');
-                    calc.isImperial = toggle.checked;
-                    
-                    calc.updateUnitLabels();
-                    calc.convertExistingValues();
-                    calc.updateCalorieCalculations();
-                },
-
-                updateUnitLabels: () => {
-                    const metricLabel = $('#metricLabel');
-                    const imperialLabel = $('#imperialLabel');
-                    const weightLabel = $('#weightLabel');
-                    const weightInput = $('#weight');
-                    const unitSelect = $('#unit');
-                    const energyUnitSelect = $('#energyUnit');
-
-                    if (metricLabel && imperialLabel) {
-                        metricLabel.classList.toggle('active', !calc.isImperial);
-                        imperialLabel.classList.toggle('active', calc.isImperial);
-                    }
-
-                    if (calc.isImperial) {
-                        if (weightLabel) weightLabel.textContent = "Dog's Weight (lbs):";
-                        if (weightInput) {
-                            weightInput.placeholder = "Enter weight in lbs";
-                            weightInput.min = "0.2";
-                            weightInput.step = "0.1";
-                        }
-                        if (unitSelect) {
-                            unitSelect.innerHTML = '<option value="oz">ounces (oz)</option>' +
-                                '<option value="lb">pounds (lb)</option>' +
-                                '<option value="g">grams (g)</option>' +
-                                '<option value="kg">kilograms (kg)</option>';
-                        }
-                        // Set energy unit to kcal/cup for imperial
-                        if (energyUnitSelect && energyUnitSelect.value === 'kcal100g') {
-                            energyUnitSelect.value = 'kcalcup';
-                        }
-                    } else {
-                        if (weightLabel) weightLabel.textContent = "Dog's Weight (kg):";
-                        if (weightInput) {
-                            weightInput.placeholder = "Enter weight in kg";
-                            weightInput.min = "0.1";
-                            weightInput.step = "0.1";
-                        }
-                        if (unitSelect) {
-                            unitSelect.innerHTML = '<option value="g">grams (g)</option>' +
-                                '<option value="kg">kilograms (kg)</option>' +
-                                '<option value="oz">ounces (oz)</option>' +
-                                '<option value="lb">pounds (lb)</option>';
-                        }
-                        // Set energy unit to kcal/100g for metric
-                        if (energyUnitSelect && energyUnitSelect.value === 'kcalcup') {
-                            energyUnitSelect.value = 'kcal100g';
-                        }
-                    }
-                },
-
-                convertExistingValues: () => {
-                    const weightInput = $('#weight');
-
-                    if (weightInput && weightInput.value) {
-                        const currentWeight = parseFloat(weightInput.value);
-                        if (!isNaN(currentWeight)) {
-                            if (calc.isImperial) {
-                                weightInput.value = calc.formatNumber(currentWeight * 2.20462, 1);
-                            } else {
-                                weightInput.value = calc.formatNumber(currentWeight / 2.20462, 1);
-                            }
-                        }
-                    }
-                },
-
-                bindEvents: () => {
-                    const weightInput = $('#weight');
-                    const dogTypeSelect = $('#dogType');
-                    const foodEnergyInput = $('#foodEnergy');
-                    const daysInput = $('#days');
-                    const unitSelect = $('#unit');
-                    const energyUnitSelect = $('#energyUnit');
-                    const unitToggle = $('#unitToggle');
-
-                    if (weightInput) {
-                        weightInput.addEventListener('input', () => calc.updateCalorieCalculations());
-                    }
-                    if (dogTypeSelect) dogTypeSelect.addEventListener('change', () => calc.updateCalorieCalculations());
-                    if (foodEnergyInput) {
-                        foodEnergyInput.addEventListener('input', () => calc.updateFoodCalculations());
-                    }
-                    if (energyUnitSelect) energyUnitSelect.addEventListener('change', () => calc.updateFoodCalculations());
-                    if (daysInput) {
-                        daysInput.addEventListener('input', () => calc.updateFoodCalculations());
-                    }
-                    if (unitSelect) unitSelect.addEventListener('change', () => calc.updateFoodCalculations());
-                    if (unitToggle) unitToggle.addEventListener('change', () => calc.toggleUnits());
-                },
-                
-                init: () => {
-                    calc.bindEvents();
-                    calc.updateUnitLabels(); // Initialize unit labels
-                    const calcContainer = $('#dogCalculator');
-                    if (calcContainer) {
-                        calcContainer.classList.add('loaded');
-                    }
-                }
-            };
-            
-            calc.init();
-            return calc;
-        }
-        
-        getThemeFromURL() {
-            const urlParams = new URLSearchParams(window.location.search);
-            const theme = urlParams.get('theme');
-            return ['light', 'dark', 'system'].includes(theme) ? theme : null;
-        }
-
-        getScaleFromURL() {
-            const urlParams = new URLSearchParams(window.location.search);
-            const scale = parseFloat(urlParams.get('scale'));
-            return (!isNaN(scale) && scale >= 0.5 && scale <= 2.0) ? scale : null;
-        }
-
-        applyTheme() {
-            if (this.options.theme === 'light' || this.options.theme === 'dark') {
-                this.container.classList.add('theme-' + this.options.theme);
-            }
-        }
-
-        applyScale() {
-            const scale = Math.max(0.5, Math.min(2.0, this.options.scale));
-            if (scale !== 1.0) {
-                this.container.style.transform = \`scale(\${scale})\`;
-                this.container.style.transformOrigin = 'top left';
-            }
-        }
-    }
     
     // Auto-initialize widgets on page load
     function initializeWidget() {

test-widget.html

@@ -24,12 +24,12 @@
     
     <div class="test-container">
         <h2>Test 1: Basic Widget</h2>
-        <div id="dog-calorie-calculator"></div>
+        <div class="dog-calorie-calculator" data-theme="light" data-scale="0.9"></div>
     </div>
     
     <div class="test-container">
         <h2>Test 2: Dark Theme Widget</h2>
-        <div id="dog-calorie-calculator" data-theme="dark" data-scale="0.5"></div>
+        <div class="dog-calorie-calculator" data-theme="dark" data-scale="0.5"></div>
     </div>
     
     <script src="sundog-dog-food-calculator.js"></script>