input-changed.py

from textual.app import App, ComposeResult
from textual.containers import VerticalScroll
from textual.widgets import Input, Static


class WeatherApp(App):
    """App to display the current weather."""

    CSS_PATH = "weather.tcss"

    def compose(self) -> ComposeResult:
        yield Input(value="Amsterdam")
        with VerticalScroll(id="weather-container"):
            yield Static(id="weather")

    async def on_input_changed(self, message: Input.Changed) -> None:
        """Called when the input changes"""
        self.query_one("#weather").update(message.input.value)


if __name__ == "__main__":
    app = WeatherApp()
    app.run()