# Focus Zone


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## FocusZone

A container that can receive focus and contains navigable items. Each
zone tracks its own focus state and can have independent navigation
patterns.

------------------------------------------------------------------------

<a
href="https://github.com/cj-mills/cjm-fasthtml-keyboard-navigation/blob/main/cjm_fasthtml_keyboard_navigation/core/focus_zone.py#L23"
target="_blank" style="float:right; font-size:smaller">source</a>

### FocusZone

``` python

def FocusZone(
    id:str, item_selector:Optional[str]=None, navigation:Union[NavigationPattern, LinearVertical]=<factory>,
    navigation_throttle_ms:int=0, item_focus_classes:tuple[str, ...]=('ring-2', 'ring-primary'),
    item_focus_attribute:str='data-focused',
    zone_focus_classes:tuple[str, ...]=('ring-2', 'ring-primary', 'inset-ring-2'),
    data_attributes:tuple[str, ...]=(), on_focus_change:Optional[str]=None, on_navigate:Optional[str]=None,
    on_zone_enter:Optional[str]=None, on_zone_leave:Optional[str]=None, scroll_behavior:str='smooth',
    scroll_block:str='nearest', hidden_input_prefix:str='', initial_index:int=0
)->None:

```

*A focusable container with navigable items.*

``` python
# Test FocusZone basics
zone = FocusZone(
    id="source-browser",
    item_selector="tr[data-selectable='true']",
    data_attributes=("job-id", "plugin-name"),
    on_focus_change="updatePreview"
)

assert zone.id == "source-browser"
assert zone.has_items() == True
assert zone.get_hidden_input_id("job-id") == "source-browser-job-id"

# Test to_js_config
config = zone.to_js_config()
assert config["id"] == "source-browser"
assert config["itemSelector"] == "tr[data-selectable='true']"
assert config["onFocusChange"] == "updatePreview"
```

``` python
# Test scroll-only zone
from cjm_fasthtml_keyboard_navigation.core.navigation import ScrollOnly

preview_zone = FocusZone(
    id="preview-panel",
    item_selector=None,
    navigation=ScrollOnly()
)

assert preview_zone.has_items() == False
assert preview_zone.navigation.name == "scroll_only"
```

``` python
# Test with custom hidden input prefix
zone_with_prefix = FocusZone(
    id="my-zone",
    hidden_input_prefix="kb",
    data_attributes=("file-path",)
)

assert zone_with_prefix.get_hidden_input_id("file-path") == "kb-file-path"
```