# Chart.js Migration - Complete
## Overview
Successfully migrated the admin evaluation dashboard from ApexCharts to Chart.js to resolve persistent `t.put is not a function` errors and other rendering issues.
## Why Migrate to Chart.js?
### Issues with ApexCharts:
1. **Persistent `t.put` errors**: Occurred when rendering on hidden elements
2. **Tab switching problems**: Race conditions during tab transitions
3. **Complex error handling**: Required multiple visibility checks and workarounds
4. **Fragile implementation**: Small timing changes caused failures
### Advantages of Chart.js:
1. **Mature library**: More stable and widely used
2. **Better hidden element handling**: Handles tab switching gracefully
3. **Simpler API**: Easier to implement and maintain
4. **No visibility checks needed**: Works with hidden elements automatically
5. **Better documentation**: Extensive examples and community support
## Implementation Details
### 1. Chart Library Change
**Before:**
```html
```
**After:**
```html
```
### 2. Chart Container Change
**Before (ApexCharts - div elements):**
```html
```
**After (Chart.js - canvas elements):**
```html
```
### 3. Chart Initialization Simplification
**Before (ApexCharts):**
```javascript
const isVisible = el.offsetParent !== null &&
style.display !== 'none' &&
style.visibility !== 'hidden' &&
style.opacity !== '0';
if (renderingFlags[elementId]) {
console.log('Chart already rendering, skipping:', elementId);
return;
}
// Multiple visibility checks and cleanup
```
**After (Chart.js):**
```javascript
function createOrUpdateChart(canvasId, config) {
const canvas = document.getElementById(canvasId);
if (!canvas) {
console.warn('Canvas element not found:', canvasId);
return;
}
// Check if chart already exists
if (charts[canvasId]) {
charts[canvasId].destroy();
delete charts[canvasId];
}
try {
const ctx = canvas.getContext('2d');
const chart = new Chart(ctx, config);
charts[canvasId] = chart;
console.log('Chart created successfully:', canvasId);
} catch (error) {
console.error('Error creating chart:', canvasId, error);
}
}
```
### 4. Chart Configuration
#### Pie Chart (Complaint Source)
```javascript
{
type: 'pie',
data: {
labels: ['Internal', 'External'],
datasets: [{
data: [internalTotal, externalTotal],
backgroundColor: ['#6366f1', '#f59e0b']
}]
},
options: {
responsive: true,
maintainAspectRatio: false,
plugins: {
legend: {
position: 'bottom'
}
}
}
}
```
#### Bar Chart (Status, Response Times)
```javascript
{
type: 'bar',
data: {
labels: ['Open', 'In Progress', 'Resolved', 'Closed'],
datasets: [{
data: [statusOpen, statusInProgress, statusResolved, statusClosed],
backgroundColor: ['#f59e0b', '#6366f1', '#10b981', '#6b7280']
}]
},
options: {
responsive: true,
maintainAspectRatio: false,
scales: {
y: {
beginAtZero: true
}
}
}
}
```
### 5. Tab Switching Handler
**Before (ApexCharts):**
```javascript
inquiryTab.addEventListener('shown.bs.tab', function () {
console.log('Inquiries tab shown, waiting before rendering charts...');
// Increased delay to ensure DOM is fully updated and tab is visible
setTimeout(renderInquiryCharts, 150);
});
```
**After (Chart.js):**
```javascript
inquiryTab.addEventListener('shown.bs.tab', function () {
console.log('Inquiries tab shown, rendering charts...');
// Chart.js handles hidden elements better, no delay needed
renderInquiryCharts();
});
```
## Key Improvements
### 1. Simplicity
- Removed complex visibility detection logic
- No need for rendering flags
- No concurrent render prevention needed
- Cleaner, more maintainable code
### 2. Reliability
- Chart.js is battle-tested and stable
- No race conditions with tab switching
- Handles hidden elements gracefully
- Consistent behavior across browsers
### 3. Performance
- No additional delays needed
- Faster tab switching
- Smoother user experience
- Less JavaScript overhead
### 4. Maintainability
- Simpler API
- Better documentation
- Easier to debug
- Less code to maintain
## Charts Implemented
### Complaints Tab (Active on Load)
1. **Complaint Source Breakdown** - Pie chart showing Internal vs External
2. **Complaint Status Distribution** - Bar chart with Open, In Progress, Resolved, Closed
3. **Complaint Activation Time** - Bar chart with ≤2h vs >2h
4. **Complaint Response Time** - Bar chart with time buckets
### Inquiries Tab (Loaded on Tab Switch)
1. **Inquiry Status Distribution** - Bar chart with Open, In Progress, Resolved, Closed
2. **Inquiry Response Time** - Bar chart with time buckets (24h, 48h, 72h, >72h)
## Testing Performed
### 1. Page Load
- ✅ Complaint charts render immediately on page load
- ✅ No console errors
- ✅ Charts display correctly with data
- ✅ Responsive design works
### 2. Tab Switching
- ✅ Switching to Inquiries tab works smoothly
- ✅ Inquiry charts render without delays
- ✅ No errors during tab switching
- ✅ Charts maintain proper proportions
### 3. Chart Interactivity
- ✅ Tooltips work correctly
- ✅ Legends are clickable
- ✅ Charts respond to hover
- ✅ Animations are smooth
### 4. Data Accuracy
- ✅ All data displays correctly
- ✅ Summary cards match chart data
- ✅ No missing or incorrect values
- ✅ Colors match design system
## Files Modified
### templates/dashboard/admin_evaluation.html
**Complete Rewrite:**
- Replaced ApexCharts with Chart.js
- Changed from `` to `