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log.md
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log.md
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# `ui.log` 日志视图
创建一个日志视图,允许添加新行而无需将整个历史记录重新发送给客户端。
`max_lines`: 在丢弃最旧的行之前的最大行数(默认:`None`)
```python
from datetime import datetime
from nicegui import ui
log = ui.log(max_lines=10).classes('w-full h-20')
ui.button('Log time', on_click=lambda: log.push(datetime.now().strftime('%X.%f')[:-5]))
# ui.run()
```
## `ui.log` 附加日志
你可以将 `ui.log` 元素附加到 Python 日志记录器对象上,这样日志消息就会被推送到日志元素中。
```python
import logging
from datetime import datetime
from nicegui import ui
logger = logging.getLogger()
class LogElementHandler(logging.Handler):
"""A logging handler that emits messages to a log element."""
def __init__(self, element: ui.log, level: int = logging.NOTSET) -> None:
self.element = element
super().__init__(level)
def emit(self, record: logging.LogRecord) -> None:
try:
msg = self.format(record)
self.element.push(msg)
except Exception:
self.handleError(record)
log = ui.log(max_lines=10).classes('w-full')
logger.addHandler(LogElementHandler(log))
ui.button('Log time', on_click=lambda: logger.warning(datetime.now().strftime('%X.%f')[:-5]))
# ui.run()
```