# TanStack Table Row Selection Verification

## Comparison with Official Example

This document verifies that our TasksDataTable implementation follows TanStack Table best practices by comparing it with the official row selection example.

**Reference:** https://github.com/TanStack/table/blob/main/examples/vue/row-selection/src/App.vue

## Key Implementation Points

### ✅ 1. Row Selection State Management

**Official Example:**
```typescript
const rowSelection = ref<RowSelectionState>({})

const table = useVueTable({
  state: {
    get rowSelection() {
      return rowSelection.value
    },
  },
  onRowSelectionChange: updateOrValue => {
    rowSelection.value =
      typeof updateOrValue === 'function'
        ? updateOrValue(rowSelection.value)
        : updateOrValue
  },
})
```

**Our Implementation:**
```typescript
const rowSelection = ref<RowSelectionState>({})

const table = useVueTable({
  state: {
    get rowSelection() {
      return rowSelection.value
    },
  },
  onRowSelectionChange: (updaterOrValue) => {
    rowSelection.value =
      typeof updaterOrValue === 'function'
        ? updaterOrValue(rowSelection.value)
        : updaterOrValue
  },
})
```

**Status:** ✅ Identical implementation

### ✅ 2. Enable Row Selection

**Official Example:**
```typescript
enableRowSelection: true
```

**Our Implementation:**
```typescript
enableRowSelection: true,
getRowId: (row) => String(row.id),
```

**Status:** ✅ Correct - We additionally specify `getRowId` to use task IDs as row identifiers

### ✅ 3. Select All Checkbox

**Official Example:**
```typescript
header: ({ table }) => {
  return (
    <IndeterminateCheckbox
      checked={table.getIsAllRowsSelected()}
      indeterminate={table.getIsSomeRowsSelected()}
      onChange={table.getToggleAllRowsSelectedHandler()}
    />
  )
}
```

**Our Implementation:**
```typescript
header: ({ table }) => {
  const isAllSelected = table.getIsAllPageRowsSelected()
  const isSomeSelected = table.getIsSomePageRowsSelected()
  
  return h(Checkbox, {
    checked: isAllSelected ? true : isSomeSelected ? 'indeterminate' : false,
    'onUpdate:checked': (value: boolean | 'indeterminate') => {
      table.toggleAllPageRowsSelected(value === true)
    },
    ariaLabel: 'Select all',
  })
}
```

**Status:** ✅ Correct - We use `getIsAllPageRowsSelected()` which is appropriate for our use case (filtered/paginated data)

### ✅ 4. Row Selection Watcher

**Our Implementation (Additional Feature):**
```typescript
watch(
  rowSelection,
  (newSelection) => {
    const selectedIds = Object.keys(newSelection)
      .filter(key => newSelection[key])
      .map(key => parseInt(key))
    emit('selection-change', selectedIds)
  },
  { deep: true }
)
```

**Status:** ✅ This is a custom enhancement to emit selection changes to the parent component

## Design Differences (Intentional)

### 1. Row Checkboxes

**Official Example:** Shows checkboxes in each row cell
**Our Implementation:** No checkboxes in row cells - selection via row clicks

**Reason:** Our design uses click-based selection (single click, Ctrl+click, Shift+click) instead of checkboxes in each row. This provides a more streamlined UI and follows common file manager selection patterns.

### 2. Custom Click Handlers

**Our Implementation:** Custom click handlers for:
- Single click: Select only clicked row
- Ctrl/Cmd+click: Toggle selection
- Shift+click: Range selection
- Right-click: Context menu with selection preservation

**Status:** ✅ This is intentional and follows the requirements in the design document

## Conclusion

Our TasksDataTable implementation correctly follows TanStack Table best practices for row selection. The differences from the official example are intentional design choices that:

1. Use click-based selection instead of row checkboxes
2. Emit selection changes to parent component
3. Support advanced selection patterns (range, toggle, context menu)
4. Use `getIsAllPageRowsSelected()` for filtered data

All TypeScript types are correct, and there are no diagnostic errors.

**Verification Date:** 2025-11-26
**Status:** ✅ VERIFIED CORRECT
