add an iterator over all events

This iterator returns tuples conntaining the event name and whatever the
value is.

typed-html/src/events.rs

@@ -3,6 +3,7 @@
 use crate::OutputType;
 use htmlescape::encode_attribute;
 use std::fmt::{Display, Error, Formatter};
+use std::iter;
 
 /// Trait for event handlers.
 pub trait EventHandler<T: OutputType, E> {
@@ -37,6 +38,18 @@ macro_rules! declare_events_struct {
             )*
         }
 
+        impl<T> Events<T> {
+            pub fn iter(&self) -> impl Iterator<Item = (&'static str, &T)> {
+                iter::empty()
+                $(
+                    .chain(
+                        self.$name.iter()
+                        .map(|value| (stringify!($name), value))
+                    )
+                )*
+            }
+        }
+
         impl<T> Default for Events<T> {
             fn default() -> Self {
                 Events {

typed-html/src/lib.rs

@@ -1,3 +1,4 @@
+#![recursion_limit = "128"]
 //! This crate provides the `html!` macro for building HTML documents inside your
 //! Rust code using roughly [JSX] compatible syntax.
 //!