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Handler

A Handler is a closure wrapper. Due to how closures work, they aren't the best to work with on structs (in this case: elements). So to fix this we use a Handler which is a wrapper for the closure, Then you can safely clone and use it without any problems (in which a normal closure would fail at)

Examples​

Handler::new(|btn: &mut Button, event, document| {
    // do something
})
rsx! {
    button {
        // No need for Handler::new
        on_click: fn(btn: &mut Button, event, document) {
            // do something
        }
    }
}

With dependents​

If you have a State<T> and want to use it in a fn(), Pub a @ before the code block like this

#[component]
pub fn App() -> Element {
    let count = State::new(0);
    rsx! {
        button {
            on_click: fn(_, _, _) @count {
                count += 1;
            },
            "The current count is: {count}"
        }
    }
}

How to call a handler​

my_handler.clone().call();
you can add multiple decedents by separating them via , like: @var1, var2, var3
fn() {} is a part of the OSUI macro rsx!. In rust you would normally use || {}