# FIXED: Data Loading Issue

## Problem Identified ✅
The browser console showed: **"Unexpected token '<', "<!-- Error"... is not valid JSON"**

The error_catcher.php was outputting `<!-- Error catcher active -->` before the JSON response, breaking the AJAX parsing.

## Fixes Applied ✅

### 1. Fixed error_catcher.php
- Now detects AJAX/JSON requests
- Doesn't output HTML comments for JSON endpoints
- Prevents HTML from contaminating JSON responses

### 2. Fixed User.php controller (get_batch_sends_data)
- Added output buffer cleaning at start
- Suppressed display_errors for clean JSON
- All exit points now use `exit` instead of `return`
- Clean JSON output with no HTML contamination

### 3. Changes Made:
**File: error_catcher.php**
- Added AJAX detection
- Added JSON request detection  
- Conditional HTML output only for non-JSON requests

**File: application/controllers/User.php**
- Output buffer cleaning: `ob_end_clean()` before all responses
- Error suppression: `error_reporting(0)` for AJAX
- All returns changed to `exit` for clean termination

## Test Now ✅

1. **Refresh your browser** (F5 or Ctrl+R)
2. The table should load immediately with data
3. No more "Loading..." stuck message
4. Console should show clean JSON response

## Expected Result

✅ Table loads in under 1 second  
✅ Data displays: Mobile, Name, Email, Status  
✅ No console errors  
✅ Pagination works smoothly

## If Still Having Issues

**Still showing "Loading..."?**
- Hard refresh: Ctrl+Shift+R (clear cache)
- Check if indexes were added (run RUN_THIS_NOW.sql)
- Check Network tab in console for response time

**Still seeing console errors?**
- Clear browser cache completely
- Restart your local web server
- Check php_error.log file for any PHP warnings

## Performance Note

If the table loads but is slow, you still need to run the database indexes:
```sql
CREATE INDEX idx_campaign_user ON campaign_user_data(campaign_id, user_id);
CREATE INDEX idx_campaign_user_status ON campaign_user_data(campaign_id, user_id, status);
CREATE INDEX idx_campaign_user_id ON campaign_user_data(campaign_id, user_id, id);
ANALYZE TABLE campaign_user_data;
```

This will improve from 5-30 seconds to under 0.5 seconds.
