DioxusLabs/dioxus · error

todo: convert_resize_data in dioxus-native. requires support

Error message

todo: convert_resize_data in dioxus-native. requires support in blitz

What it means

dioxus-native (the blitz-rendered native target) implements dioxus-html's HtmlEventConverter trait, but many conversions are stubs. convert_resize_data calls unimplemented!() because blitz does not yet deliver resize events, so any attempt to convert a platform resize event into the ResizeData an onresize handler expects panics at runtime. The panic happens when the event fires, not at compile time.

Source

Thrown at packages/native-dom/src/events.rs:134

    fn convert_toggle_data(&self, _event: &PlatformEventData) -> ToggleData {
        unimplemented!("todo: convert_toggle_data in dioxus-native. requires support in blitz")
    }

    fn convert_touch_data(&self, event: &PlatformEventData) -> TouchData {
        event.downcast::<NativeTouchData>().unwrap().clone().into()
    }

    fn convert_transition_data(&self, _event: &PlatformEventData) -> TransitionData {
        unimplemented!("todo: convert_transition_data in dioxus-native. requires support in blitz")
    }

    fn convert_wheel_data(&self, event: &PlatformEventData) -> WheelData {
        event.downcast::<NativeWheelData>().unwrap().clone().into()
    }

    fn convert_resize_data(&self, _event: &PlatformEventData) -> ResizeData {
        unimplemented!("todo: convert_resize_data in dioxus-native. requires support in blitz")
    }

    fn convert_visible_data(&self, _event: &PlatformEventData) -> VisibleData {
        unimplemented!("todo: convert_visible_data in dioxus-native. requires support in blitz")
    }
}

#[derive(Clone)]
pub struct NodeHandle {
    pub(crate) doc: Rc<RefCell<BaseDocument>>,
    pub(crate) node_id: NodeId,
}

impl NodeHandle {
    pub fn node_id(&self) -> NodeId {
        self.node_id
    }

View on GitHub (pinned to 393d190a80)

Solutions

1. Remove or cfg-gate the onresize handler when targeting dioxus-native
2. Read element size through the MountedData/NodeHandle API (it exposes the blitz BaseDocument via doc()) instead of resize events
3. Use the desktop (webview) or web renderer for this view, where resize events are supported
4. Track dioxus-native/blitz for resize event support and upgrade once convert_resize_data is implemented

Example fix

// before: panics in dioxus-native when a resize event is converted
rsx! { div { onresize: move |_e| tracing::info!("resized"), "hi" } }

// after: only register the handler on renderers that support it
rsx! {
    div {
        #[cfg(not(feature = "dx-native"))] // adjust to your native feature flag
        onresize: move |_e| tracing::info!("resized"),
        "hi"
    }
}

// Render resize-dependent UI only on renderers that support resize events
fn supports_resize_events() -> bool {
    cfg!(any(target_arch = "wasm32", feature = "desktop")) // adjust per your setup
}

fn supports_resize_events() -> bool {
    cfg!(any(target_arch = "wasm32", feature = "desktop"))
}

When it happens

Trigger: Building with the dioxus-native renderer and attaching an onresize handler (on a div or any element) that then receives a resize event; the VirtualDOM calls NativeConverter::convert_resize_data, which is an unimplemented!() stub.

Common situations: Porting a web or desktop app that relies on onresize to the native (blitz) renderer; using size-observation patterns (layout measurement, container queries) in a dioxus-native app before blitz gained resize event support.

Related errors

• todo: convert_visible_data in dioxus-native. requires suppor
• Callback was called after the runtime was dropped
• only an InputElement or TextAreaElement or an element with c
• expected URL to be UTF-8 encoded
• Failed to get asset manager

AI-assisted analysis of DioxusLabs/dioxus@393d190a80 (2026-08-16). Data as JSON: /api/errors/d076677ddfc5b6b0. Report an issue: GitHub.