> ## Documentation Index
> Fetch the complete documentation index at: https://docs.askui.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Lists & Navigation

> Extract sidebar items, menu options, and hierarchical navigation structures

Navigation elements like sidebars, menus, and lists are essential UI components. Learn how to extract these structures.

## Basic List Extraction

```python theme={null}
from askui import VisionAgent, ResponseSchemaBase
from typing import List


class SidebarItem(ResponseSchemaBase):
    name: str
    children: List["SidebarItem"]

class Sidebar(ResponseSchemaBase):
    sidebar: List["SidebarItem"]


with VisionAgent() as agent:
    agent.tools.webbrowser.open_new("https://docs.askui.com")
    agent.wait(3)  # Wait for page to load
    
    result = agent.get("Can you extract me the sidebar?", response_schema=Sidebar)
    print(result.model_dump_json(indent=2))
```

## Best Practices

1. **Handle Empty Lists**: Always check if lists are empty
   ```python theme={null}
   items = agent.get("What are the menu items?", response_schema=List[str])

   if not items:
       print("No menu items found")
   else:
       print(f"Found {len(items)} menu items")
   ```