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Events

Events are how Reflex responds to user interactions like clicking a button, submitting a form, or hovering over an element. In Reflex, events trigger Event Handlers in your State class.

Event Handlers

An event handler is a method in your state class that logic.

python

class CounterState(rx.State):
    count: int = 0

    def increment(self):
        self.count += 1

You hook this up in your UI using component props:

python

rx.el.button("Add", on_click=CounterState.increment)

Async Handlers & Yielding

If an event handler performs a long-running task (like an API call), it should be async. Reflex also allows you to yield actions to update the UI progressively.

python

class SearchState(rx.State):
    results: list[str] = []
    loading: bool = False

    async def run_search(self, query: str):
        self.loading = True
        yield  # Update UI to show loading spinner

        # Simulate API call
        await asyncio.sleep(2)
        self.results = ["Result 1", "Result 2"]

        self.loading = False

Chaining Events

You can trigger multiple events from a single interaction by passing a list to the event prop.

python

rx.el.button(
    "Save", 
    on_click=[
        State.save_data,
        rx.toast("Data Saved!"),
        rx.redirect("/dashboard")
    ]
)

Common Event Triggers

Triggers than can be attached to Reflex components:

EventDescription
on_clickTriggered on mouse click.
on_changeTriggered when an input value changes.
on_submitTriggered when a form is submitted.
on_mountTriggered when a component is first rendered on the page.
on_blurTriggered when a component loses focus.

Special Actions

Reflex provides built-in "Special Actions" that can be triggered from handlers:

UtilityDescription
rx.redirect(url)Navigate to a new page.
rx.set_clipboard(text)Copy text to the user's clipboard.
rx.toast(message)Show a brief notification.
rx.call_script(js)Execute custom JavaScript in the browser.