Multi-step debugging

gistfile1.txt

---

## 🤖 Claude

Perfect! The build succeeds. Now let's commit this debug version so you can test it on iOS and see what the logs tell us:

---

## 🤖 Claude

I've added comprehensive debug logging to diagnose the issue. Here's what I need you to do:

## Test on iOS

1. **Build and deploy** the latest code to your iOS device
2. **Navigate to Events page** in list view mode
3. **Open the Logs page** (Settings → Logs)
4. **Look for these log messages**:

### Expected logs to find:

**From Events.tsx callback ref:**
```
Events callback ref fired
{
  el: "DIV element" or "null",
  clientHeight: <number>,
  scrollHeight: <number>
}
```

**From EventListView:**
```
EventListView render
{
  hasParentElement: true/false,
  hasParentRef: true/false,
  eventsCount: 43,
  totalSize: <number>,
  virtualItemsCount: <number>
}
```

**Either:**
```
EventListView: no parentElement, showing loading
```
OR
```
EventListView: rendering list
{
  totalSize: <number>,
  virtualItemsCount: <number>
}
```

## What to check:

1. **Does the callback ref fire?** - Should see "Events callback ref fired" with element info
2. **Does EventListView get parentElement?** - Check `hasParentElement: true/false`
3. **What's the totalSize?** - Should be around 6,020px (43 events × 140px)
4. **How many virtualItems?** - Should be > 0 if virtualizer is working

**Please copy and paste the relevant log entries** so I can see exactly what's happening on iOS.

---

## 👤 User

⚡️  [log] - 12/24/2025, 9:06:26 AM INFO [API] Fetching events page 1 {"currentCount":0,"desired":300}
⚡️  To Native ->  CapacitorHttp request 22036604
⚡️  To Native ->  CapacitorHttp request 22036605
⚡️  TO JS {"url":"http:","s
⚡️  TO JS {"headers":{"content-length":"29434","date":"Wed, 24 Dec 2025 14:06:26 GMT","content-type":"application\/json; charset=UTF-8","connection":"keep-alive","server":"nginx\/1.27.2","cache-control":"no-cache","expires":"Thu, 01 Jan 1970 00:00:01 GMT"},"status":
⚡️  [log] - 12/24/2025, 9:06:26 AM INFO [API] Fetched events complete {"total":43,"returning":43,"requested":300}
⚡️  [log] - 12/24/2025, 9:06:26 AM WARN [EventDetail] EventListView: no parentElement, showing loading
⚡️  [log] - 12/24/2025, 9:06:26 AM INFO [EventDetail] EventListView: rendering list {"totalSize":6020,"virtualItemsCount":0}

---

## 🤖 Claude

Perfect! The logs reveal the exact problem:

```
WARN [EventDetail] EventListView: no parentElement, showing loading
INFO [EventDetail] EventListView: rendering list {"totalSize":6020,"virtualItemsCount":0}
```

Two things are happening:
1. **First render**: No parentElement → shows loading (expected)
2. **Second render**: Has parentElement → renders list BUT **virtualItemsCount is 0**!

The virtualizer has the correct totalSize (6020px for 43 events) but is returning **zero virtual items to render**. This means the virtualizer thinks there are no items in the viewport.

The issue is that the virtualizer's `getScrollElement: () => parentRef.current` might be getting the ref **before** it's properly measured, or the scroll container has zero height.

Let me add more diagnostic logging to check the parent dimensions:

---

## 🤖 Claude

Perfect! I've added more detailed logging. The issue is now clear from your previous logs:

## What's Happening

**The virtualizer is returning 0 items even though:**
- totalSize = 6020px (correct)
- eventsCount = 43 (correct)  
- parentElement exists (second render)

This means **the virtualizer thinks there are no items in the viewport** - likely because the scroll container has zero height.

## Enhanced Logging

I've added logging to show:
- Scroll element dimensions (clientHeight, scrollHeight, offsetHeight)
- Whether parentElement === parentRef.current
- ERROR log when virtualItems is 0 but we have events

## Please Test Again

Deploy this version and look for these new log entries:

```
EventListView render
{
  hasParentElement: true/false,
  hasParentRef: true/false,
  parentSame: true/false,
  eventsCount: 43,
  totalSize: 6020,
  virtualItemsCount: 0,
  scrollElement: {
    clientHeight: ???,   <-- This is key!
    scrollHeight: ???,
    offsetHeight: ???
  }
}
```

And you should also see:
```
ERROR EventListView: virtualizer returned 0 items but we have events
```

**The clientHeight is the critical value** - if it's 0, that explains why the virtualizer returns no items. Please share the new logs!

---

## 👤 User

⚡️  [log] - 12/24/2025, 9:08:51 AM INFO [API] Fetching events page 1 {"currentCount":0,"desired":300}
⚡️  To Native ->  CapacitorHttp request 62481261
⚡️  To Native ->  CapacitorHttp request 62481262
⚡️  TO JS {"url":"","d
⚡️  TO JS {"headers":{"cache-control":"no-cache","date":"Wed, 24 Dec 2025 14:08:51 GMT","server":"nginx\/1.27.2","expires":"Thu, 01 Jan 1970 00:00:01 GMT","connection":"keep-alive","content-type":"application\/json; charset=UTF-8","content-length":"29434"},"url":"ht
⚡️  [log] - 12/24/2025, 9:08:51 AM INFO [API] Fetched events complete {"total":43,"returning":43,"requested":300}
⚡️  [log] - 12/24/2025, 9:08:51 AM WARN [EventDetail] EventListView: no parentElement, showing loading
⚡️  [log] - 12/24/2025, 9:08:51 AM INFO [EventDetail] EventListView: rendering list {"totalSize":6020,"virtualItemsCount":0,"scrollElement":{"clientHeight":618,"scrollHeight":618,"offsetHeight":618}}
⚡️  [log] - 12/24/2025, 9:08:51 AM ERROR [EventDetail] EventListView: virtualizer returned 0 items but we have events {"eventsCount":43,"totalSize":6020,"scrollElement":"exists"}

---

## 🤖 Claude

Excellent! Now I can see the exact problem:

```
scrollElement: { clientHeight: 618, scrollHeight: 618, offsetHeight: 618 }
virtualItemsCount: 0
```

The scroll element has a proper height (618px) BUT the virtualizer is returning 0 items. This happens because **the virtualizer was initialized before the scroll element was available**.

Here's the sequence:
1. **First render**: `parentRef.current` is null → EventListView returns "Loading..."
2. **Second render**: `parentRef.current` is set → but the virtualizer doesn't realize it should re-measure

The virtualizer needs to be told to **re-measure** when the scroll element becomes available. Let me fix this:

---

## 🤖 Claude

Perfect! I found and fixed the root cause. Here's what was happening:

## The Problem

**Timeline:**
1. **First render**: `parentRef.current` is `null`
   - `useVirtualizer` initializes with `getScrollElement: () => null`
   - Component returns "Loading..." early
   
2. **Second render**: `parentRef.current` is now the DIV element
   - `useVirtualizer` is called again, but it was already initialized
   - The virtualizer **never re-measured** the viewport
   - Result: `virtualItemsCount: 0` despite having 43 events

The virtualizer was stuck thinking there was no scroll container to measure!

## The Solution

Added a `useEffect` that **forces the virtualizer to re-measure** when `parentElement` becomes available:

```typescript
useEffect(() => {
  if (parentElement) {
    log.eventDetail('EventListView: forcing virtualizer to measure', LogLevel.INFO);
    rowVirtualizer.measure();
  }
}, [parentElement, rowVirtualizer]);
```

This tells the virtualizer to:
1. Re-query the scroll element (now non-null)
2. Measure viewport dimensions (618px height)
3. Calculate which items should be visible

## Please Test

Deploy this version and you should see:
1. The event list appears immediately ✓
2. New log: `"EventListView: forcing virtualizer to measure"`
3. After that log, `virtualItemsCount` should be > 0 (around 5-6 items)

Let me know if the event list now shows correctly on iOS!

---

## 👤 User

works!

---

## 🤖 Claude

Excellent! The event list is working now. Let me clean up the debug logging we added during investigation: